Age Owner Branch data TLA Line data Source code
1 : : /*-------------------------------------------------------------------------
2 : : * worker.c
3 : : * PostgreSQL logical replication worker (apply)
4 : : *
5 : : * Copyright (c) 2016-2026, PostgreSQL Global Development Group
6 : : *
7 : : * IDENTIFICATION
8 : : * src/backend/replication/logical/worker.c
9 : : *
10 : : * NOTES
11 : : * This file contains the worker which applies logical changes as they come
12 : : * from remote logical replication stream.
13 : : *
14 : : * The main worker (apply) is started by logical replication worker
15 : : * launcher for every enabled subscription in a database. It uses
16 : : * walsender protocol to communicate with publisher.
17 : : *
18 : : * This module includes server facing code and shares libpqwalreceiver
19 : : * module with walreceiver for providing the libpq specific functionality.
20 : : *
21 : : *
22 : : * STREAMED TRANSACTIONS
23 : : * ---------------------
24 : : * Streamed transactions (large transactions exceeding a memory limit on the
25 : : * upstream) are applied using one of two approaches:
26 : : *
27 : : * 1) Write to temporary files and apply when the final commit arrives
28 : : *
29 : : * This approach is used when the user has set the subscription's streaming
30 : : * option as on.
31 : : *
32 : : * Unlike the regular (non-streamed) case, handling streamed transactions has
33 : : * to handle aborts of both the toplevel transaction and subtransactions. This
34 : : * is achieved by tracking offsets for subtransactions, which is then used
35 : : * to truncate the file with serialized changes.
36 : : *
37 : : * The files are placed in tmp file directory by default, and the filenames
38 : : * include both the XID of the toplevel transaction and OID of the
39 : : * subscription. This is necessary so that different workers processing a
40 : : * remote transaction with the same XID doesn't interfere.
41 : : *
42 : : * We use BufFiles instead of using normal temporary files because (a) the
43 : : * BufFile infrastructure supports temporary files that exceed the OS file size
44 : : * limit, (b) provides a way for automatic clean up on the error and (c) provides
45 : : * a way to survive these files across local transactions and allow to open and
46 : : * close at stream start and close. We decided to use FileSet
47 : : * infrastructure as without that it deletes the files on the closure of the
48 : : * file and if we decide to keep stream files open across the start/stop stream
49 : : * then it will consume a lot of memory (more than 8K for each BufFile and
50 : : * there could be multiple such BufFiles as the subscriber could receive
51 : : * multiple start/stop streams for different transactions before getting the
52 : : * commit). Moreover, if we don't use FileSet then we also need to invent
53 : : * a new way to pass filenames to BufFile APIs so that we are allowed to open
54 : : * the file we desired across multiple stream-open calls for the same
55 : : * transaction.
56 : : *
57 : : * 2) Parallel apply workers.
58 : : *
59 : : * This approach is used when the user has set the subscription's streaming
60 : : * option as parallel. See logical/applyparallelworker.c for information about
61 : : * this approach.
62 : : *
63 : : * TWO_PHASE TRANSACTIONS
64 : : * ----------------------
65 : : * Two phase transactions are replayed at prepare and then committed or
66 : : * rolled back at commit prepared and rollback prepared respectively. It is
67 : : * possible to have a prepared transaction that arrives at the apply worker
68 : : * when the tablesync is busy doing the initial copy. In this case, the apply
69 : : * worker skips all the prepared operations [e.g. inserts] while the tablesync
70 : : * is still busy (see the condition of should_apply_changes_for_rel). The
71 : : * tablesync worker might not get such a prepared transaction because say it
72 : : * was prior to the initial consistent point but might have got some later
73 : : * commits. Now, the tablesync worker will exit without doing anything for the
74 : : * prepared transaction skipped by the apply worker as the sync location for it
75 : : * will be already ahead of the apply worker's current location. This would lead
76 : : * to an "empty prepare", because later when the apply worker does the commit
77 : : * prepare, there is nothing in it (the inserts were skipped earlier).
78 : : *
79 : : * To avoid this, and similar prepare confusions the subscription's two_phase
80 : : * commit is enabled only after the initial sync is over. The two_phase option
81 : : * has been implemented as a tri-state with values DISABLED, PENDING, and
82 : : * ENABLED.
83 : : *
84 : : * Even if the user specifies they want a subscription with two_phase = on,
85 : : * internally it will start with a tri-state of PENDING which only becomes
86 : : * ENABLED after all tablesync initializations are completed - i.e. when all
87 : : * tablesync workers have reached their READY state. In other words, the value
88 : : * PENDING is only a temporary state for subscription start-up.
89 : : *
90 : : * Until the two_phase is properly available (ENABLED) the subscription will
91 : : * behave as if two_phase = off. When the apply worker detects that all
92 : : * tablesyncs have become READY (while the tri-state was PENDING) it will
93 : : * restart the apply worker process. This happens in
94 : : * ProcessSyncingTablesForApply.
95 : : *
96 : : * When the (re-started) apply worker finds that all tablesyncs are READY for a
97 : : * two_phase tri-state of PENDING it start streaming messages with the
98 : : * two_phase option which in turn enables the decoding of two-phase commits at
99 : : * the publisher. Then, it updates the tri-state value from PENDING to ENABLED.
100 : : * Now, it is possible that during the time we have not enabled two_phase, the
101 : : * publisher (replication server) would have skipped some prepares but we
102 : : * ensure that such prepares are sent along with commit prepare, see
103 : : * ReorderBufferFinishPrepared.
104 : : *
105 : : * If the subscription has no tables then a two_phase tri-state PENDING is
106 : : * left unchanged. This lets the user still do an ALTER SUBSCRIPTION REFRESH
107 : : * PUBLICATION which might otherwise be disallowed (see below).
108 : : *
109 : : * If ever a user needs to be aware of the tri-state value, they can fetch it
110 : : * from the pg_subscription catalog (see column subtwophasestate).
111 : : *
112 : : * Finally, to avoid problems mentioned in previous paragraphs from any
113 : : * subsequent (not READY) tablesyncs (need to toggle two_phase option from 'on'
114 : : * to 'off' and then again back to 'on') there is a restriction for
115 : : * ALTER SUBSCRIPTION REFRESH PUBLICATION. This command is not permitted when
116 : : * the two_phase tri-state is ENABLED, except when copy_data = false.
117 : : *
118 : : * We can get prepare of the same GID more than once for the genuine cases
119 : : * where we have defined multiple subscriptions for publications on the same
120 : : * server and prepared transaction has operations on tables subscribed to those
121 : : * subscriptions. For such cases, if we use the GID sent by publisher one of
122 : : * the prepares will be successful and others will fail, in which case the
123 : : * server will send them again. Now, this can lead to a deadlock if user has
124 : : * set synchronous_standby_names for all the subscriptions on subscriber. To
125 : : * avoid such deadlocks, we generate a unique GID (consisting of the
126 : : * subscription oid and the xid of the prepared transaction) for each prepare
127 : : * transaction on the subscriber.
128 : : *
129 : : * FAILOVER
130 : : * ----------------------
131 : : * The logical slot on the primary can be synced to the standby by specifying
132 : : * failover = true when creating the subscription. Enabling failover allows us
133 : : * to smoothly transition to the promoted standby, ensuring that we can
134 : : * subscribe to the new primary without losing any data.
135 : : *
136 : : * RETAIN DEAD TUPLES
137 : : * ----------------------
138 : : * Each apply worker that enabled retain_dead_tuples option maintains a
139 : : * non-removable transaction ID (oldest_nonremovable_xid) in shared memory to
140 : : * prevent dead rows from being removed prematurely when the apply worker still
141 : : * needs them to detect update_deleted conflicts. Additionally, this helps to
142 : : * retain the required commit_ts module information, which further helps to
143 : : * detect update_origin_differs and delete_origin_differs conflicts reliably, as
144 : : * otherwise, vacuum freeze could remove the required information.
145 : : *
146 : : * The logical replication launcher manages an internal replication slot named
147 : : * "pg_conflict_detection". It asynchronously aggregates the non-removable
148 : : * transaction ID from all apply workers to determine the appropriate xmin for
149 : : * the slot, thereby retaining necessary tuples.
150 : : *
151 : : * The non-removable transaction ID in the apply worker is advanced to the
152 : : * oldest running transaction ID once all concurrent transactions on the
153 : : * publisher have been applied and flushed locally. The process involves:
154 : : *
155 : : * - RDT_GET_CANDIDATE_XID:
156 : : * Call GetOldestActiveTransactionId() to take oldestRunningXid as the
157 : : * candidate xid.
158 : : *
159 : : * - RDT_REQUEST_PUBLISHER_STATUS:
160 : : * Send a message to the walsender requesting the publisher status, which
161 : : * includes the latest WAL write position and information about transactions
162 : : * that are in the commit phase.
163 : : *
164 : : * - RDT_WAIT_FOR_PUBLISHER_STATUS:
165 : : * Wait for the status from the walsender. After receiving the first status,
166 : : * do not proceed if there are concurrent remote transactions that are still
167 : : * in the commit phase. These transactions might have been assigned an
168 : : * earlier commit timestamp but have not yet written the commit WAL record.
169 : : * Continue to request the publisher status (RDT_REQUEST_PUBLISHER_STATUS)
170 : : * until all these transactions have completed.
171 : : *
172 : : * - RDT_WAIT_FOR_LOCAL_FLUSH:
173 : : * Advance the non-removable transaction ID if the current flush location has
174 : : * reached or surpassed the last received WAL position.
175 : : *
176 : : * - RDT_STOP_CONFLICT_INFO_RETENTION:
177 : : * This phase is required only when max_retention_duration is defined. We
178 : : * enter this phase if the wait time in either the
179 : : * RDT_WAIT_FOR_PUBLISHER_STATUS or RDT_WAIT_FOR_LOCAL_FLUSH phase exceeds
180 : : * configured max_retention_duration. In this phase,
181 : : * pg_subscription.subretentionactive is updated to false within a new
182 : : * transaction, and oldest_nonremovable_xid is set to InvalidTransactionId.
183 : : *
184 : : * - RDT_RESUME_CONFLICT_INFO_RETENTION:
185 : : * This phase is required only when max_retention_duration is defined. We
186 : : * enter this phase if the retention was previously stopped, and the time
187 : : * required to advance the non-removable transaction ID in the
188 : : * RDT_WAIT_FOR_LOCAL_FLUSH phase has decreased to within acceptable limits
189 : : * (or if max_retention_duration is set to 0). During this phase,
190 : : * pg_subscription.subretentionactive is updated to true within a new
191 : : * transaction, and the worker will be restarted.
192 : : *
193 : : * The overall state progression is: GET_CANDIDATE_XID ->
194 : : * REQUEST_PUBLISHER_STATUS -> WAIT_FOR_PUBLISHER_STATUS -> (loop to
195 : : * REQUEST_PUBLISHER_STATUS till concurrent remote transactions end) ->
196 : : * WAIT_FOR_LOCAL_FLUSH -> loop back to GET_CANDIDATE_XID.
197 : : *
198 : : * Retaining the dead tuples for this period is sufficient for ensuring
199 : : * eventual consistency using last-update-wins strategy, as dead tuples are
200 : : * useful for detecting conflicts only during the application of concurrent
201 : : * transactions from remote nodes. After applying and flushing all remote
202 : : * transactions that occurred concurrently with the tuple DELETE, any
203 : : * subsequent UPDATE from a remote node should have a later timestamp. In such
204 : : * cases, it is acceptable to detect an update_missing scenario and convert the
205 : : * UPDATE to an INSERT when applying it. But, for concurrent remote
206 : : * transactions with earlier timestamps than the DELETE, detecting
207 : : * update_deleted is necessary, as the UPDATEs in remote transactions should be
208 : : * ignored if their timestamp is earlier than that of the dead tuples.
209 : : *
210 : : * Note that advancing the non-removable transaction ID is not supported if the
211 : : * publisher is also a physical standby. This is because the logical walsender
212 : : * on the standby can only get the WAL replay position but there may be more
213 : : * WALs that are being replicated from the primary and those WALs could have
214 : : * earlier commit timestamp.
215 : : *
216 : : * Similarly, when the publisher has subscribed to another publisher,
217 : : * information necessary for conflict detection cannot be retained for
218 : : * changes from origins other than the publisher. This is because publisher
219 : : * lacks the information on concurrent transactions of other publishers to
220 : : * which it subscribes. As the information on concurrent transactions is
221 : : * unavailable beyond subscriber's immediate publishers, the non-removable
222 : : * transaction ID might be advanced prematurely before changes from other
223 : : * origins have been fully applied.
224 : : *
225 : : * XXX Retaining information for changes from other origins might be possible
226 : : * by requesting the subscription on that origin to enable retain_dead_tuples
227 : : * and fetching the conflict detection slot.xmin along with the publisher's
228 : : * status. In the RDT_WAIT_FOR_PUBLISHER_STATUS phase, the apply worker could
229 : : * wait for the remote slot's xmin to reach the oldest active transaction ID,
230 : : * ensuring that all transactions from other origins have been applied on the
231 : : * publisher, thereby getting the latest WAL position that includes all
232 : : * concurrent changes. However, this approach may impact performance, so it
233 : : * might not worth the effort.
234 : : *
235 : : * XXX It seems feasible to get the latest commit's WAL location from the
236 : : * publisher and wait till that is applied. However, we can't do that
237 : : * because commit timestamps can regress as a commit with a later LSN is not
238 : : * guaranteed to have a later timestamp than those with earlier LSNs. Having
239 : : * said that, even if that is possible, it won't improve performance much as
240 : : * the apply always lag and moves slowly as compared with the transactions
241 : : * on the publisher.
242 : : *-------------------------------------------------------------------------
243 : : */
244 : :
245 : : #include "postgres.h"
246 : :
247 : : #include <sys/stat.h>
248 : : #include <unistd.h>
249 : :
250 : : #include "access/commit_ts.h"
251 : : #include "access/table.h"
252 : : #include "access/tableam.h"
253 : : #include "access/twophase.h"
254 : : #include "access/xact.h"
255 : : #include "catalog/indexing.h"
256 : : #include "catalog/pg_inherits.h"
257 : : #include "catalog/pg_subscription.h"
258 : : #include "catalog/pg_subscription_rel.h"
259 : : #include "commands/subscriptioncmds.h"
260 : : #include "commands/tablecmds.h"
261 : : #include "commands/trigger.h"
262 : : #include "executor/executor.h"
263 : : #include "executor/execPartition.h"
264 : : #include "libpq/pqformat.h"
265 : : #include "miscadmin.h"
266 : : #include "optimizer/optimizer.h"
267 : : #include "parser/parse_relation.h"
268 : : #include "pgstat.h"
269 : : #include "postmaster/bgworker.h"
270 : : #include "postmaster/interrupt.h"
271 : : #include "postmaster/walwriter.h"
272 : : #include "replication/conflict.h"
273 : : #include "replication/logicallauncher.h"
274 : : #include "replication/logicalproto.h"
275 : : #include "replication/logicalrelation.h"
276 : : #include "replication/logicalworker.h"
277 : : #include "replication/origin.h"
278 : : #include "replication/slot.h"
279 : : #include "replication/walreceiver.h"
280 : : #include "replication/worker_internal.h"
281 : : #include "rewrite/rewriteHandler.h"
282 : : #include "storage/buffile.h"
283 : : #include "storage/ipc.h"
284 : : #include "storage/latch.h"
285 : : #include "storage/lmgr.h"
286 : : #include "storage/procarray.h"
287 : : #include "tcop/tcopprot.h"
288 : : #include "utils/acl.h"
289 : : #include "utils/guc.h"
290 : : #include "utils/inval.h"
291 : : #include "utils/lsyscache.h"
292 : : #include "utils/memutils.h"
293 : : #include "utils/pg_lsn.h"
294 : : #include "utils/rel.h"
295 : : #include "utils/rls.h"
296 : : #include "utils/snapmgr.h"
297 : : #include "utils/syscache.h"
298 : : #include "utils/usercontext.h"
299 : : #include "utils/wait_event.h"
300 : :
301 : : #define NAPTIME_PER_CYCLE 1000 /* max sleep time between cycles (1s) */
302 : :
303 : : typedef struct FlushPosition
304 : : {
305 : : dlist_node node;
306 : : XLogRecPtr local_end;
307 : : XLogRecPtr remote_end;
308 : : } FlushPosition;
309 : :
310 : : static dlist_head lsn_mapping = DLIST_STATIC_INIT(lsn_mapping);
311 : :
312 : : typedef struct ApplyExecutionData
313 : : {
314 : : EState *estate; /* executor state, used to track resources */
315 : :
316 : : LogicalRepRelMapEntry *targetRel; /* replication target rel */
317 : : ResultRelInfo *targetRelInfo; /* ResultRelInfo for same */
318 : :
319 : : /* These fields are used when the target relation is partitioned: */
320 : : ModifyTableState *mtstate; /* dummy ModifyTable state */
321 : : PartitionTupleRouting *proute; /* partition routing info */
322 : : } ApplyExecutionData;
323 : :
324 : : /* Struct for saving and restoring apply errcontext information */
325 : : typedef struct ApplyErrorCallbackArg
326 : : {
327 : : LogicalRepMsgType command; /* 0 if invalid */
328 : : LogicalRepRelMapEntry *rel;
329 : :
330 : : /* Remote node information */
331 : : int remote_attnum; /* -1 if invalid */
332 : : TransactionId remote_xid;
333 : : XLogRecPtr finish_lsn;
334 : : char *origin_name;
335 : : } ApplyErrorCallbackArg;
336 : :
337 : : /*
338 : : * The action to be taken for the changes in the transaction.
339 : : *
340 : : * TRANS_LEADER_APPLY:
341 : : * This action means that we are in the leader apply worker or table sync
342 : : * worker. The changes of the transaction are either directly applied or
343 : : * are read from temporary files (for streaming transactions) and then
344 : : * applied by the worker.
345 : : *
346 : : * TRANS_LEADER_SERIALIZE:
347 : : * This action means that we are in the leader apply worker or table sync
348 : : * worker. Changes are written to temporary files and then applied when the
349 : : * final commit arrives.
350 : : *
351 : : * TRANS_LEADER_SEND_TO_PARALLEL:
352 : : * This action means that we are in the leader apply worker and need to send
353 : : * the changes to the parallel apply worker.
354 : : *
355 : : * TRANS_LEADER_PARTIAL_SERIALIZE:
356 : : * This action means that we are in the leader apply worker and have sent some
357 : : * changes directly to the parallel apply worker and the remaining changes are
358 : : * serialized to a file, due to timeout while sending data. The parallel apply
359 : : * worker will apply these serialized changes when the final commit arrives.
360 : : *
361 : : * We can't use TRANS_LEADER_SERIALIZE for this case because, in addition to
362 : : * serializing changes, the leader worker also needs to serialize the
363 : : * STREAM_XXX message to a file, and wait for the parallel apply worker to
364 : : * finish the transaction when processing the transaction finish command. So
365 : : * this new action was introduced to keep the code and logic clear.
366 : : *
367 : : * TRANS_PARALLEL_APPLY:
368 : : * This action means that we are in the parallel apply worker and changes of
369 : : * the transaction are applied directly by the worker.
370 : : */
371 : : typedef enum
372 : : {
373 : : /* The action for non-streaming transactions. */
374 : : TRANS_LEADER_APPLY,
375 : :
376 : : /* Actions for streaming transactions. */
377 : : TRANS_LEADER_SERIALIZE,
378 : : TRANS_LEADER_SEND_TO_PARALLEL,
379 : : TRANS_LEADER_PARTIAL_SERIALIZE,
380 : : TRANS_PARALLEL_APPLY,
381 : : } TransApplyAction;
382 : :
383 : : /*
384 : : * The phases involved in advancing the non-removable transaction ID.
385 : : *
386 : : * See comments atop worker.c for details of the transition between these
387 : : * phases.
388 : : */
389 : : typedef enum
390 : : {
391 : : RDT_GET_CANDIDATE_XID,
392 : : RDT_REQUEST_PUBLISHER_STATUS,
393 : : RDT_WAIT_FOR_PUBLISHER_STATUS,
394 : : RDT_WAIT_FOR_LOCAL_FLUSH,
395 : : RDT_STOP_CONFLICT_INFO_RETENTION,
396 : : RDT_RESUME_CONFLICT_INFO_RETENTION,
397 : : } RetainDeadTuplesPhase;
398 : :
399 : : /*
400 : : * Critical information for managing phase transitions within the
401 : : * RetainDeadTuplesPhase.
402 : : */
403 : : typedef struct RetainDeadTuplesData
404 : : {
405 : : RetainDeadTuplesPhase phase; /* current phase */
406 : : XLogRecPtr remote_lsn; /* WAL write position on the publisher */
407 : :
408 : : /*
409 : : * Oldest transaction ID that was in the commit phase on the publisher.
410 : : * Use FullTransactionId to prevent issues with transaction ID wraparound,
411 : : * where a new remote_oldestxid could falsely appear to originate from the
412 : : * past and block advancement.
413 : : */
414 : : FullTransactionId remote_oldestxid;
415 : :
416 : : /*
417 : : * Next transaction ID to be assigned on the publisher. Use
418 : : * FullTransactionId for consistency and to allow straightforward
419 : : * comparisons with remote_oldestxid.
420 : : */
421 : : FullTransactionId remote_nextxid;
422 : :
423 : : TimestampTz reply_time; /* when the publisher responds with status */
424 : :
425 : : /*
426 : : * Publisher transaction ID that must be awaited to complete before
427 : : * entering the final phase (RDT_WAIT_FOR_LOCAL_FLUSH). Use
428 : : * FullTransactionId for the same reason as remote_nextxid.
429 : : */
430 : : FullTransactionId remote_wait_for;
431 : :
432 : : TransactionId candidate_xid; /* candidate for the non-removable
433 : : * transaction ID */
434 : : TimestampTz flushpos_update_time; /* when the remote flush position was
435 : : * updated in final phase
436 : : * (RDT_WAIT_FOR_LOCAL_FLUSH) */
437 : :
438 : : long table_sync_wait_time; /* time spent waiting for table sync
439 : : * to finish */
440 : :
441 : : /*
442 : : * The following fields are used to determine the timing for the next
443 : : * round of transaction ID advancement.
444 : : */
445 : : TimestampTz last_recv_time; /* when the last message was received */
446 : : TimestampTz candidate_xid_time; /* when the candidate_xid is decided */
447 : : int xid_advance_interval; /* how much time (ms) to wait before
448 : : * attempting to advance the
449 : : * non-removable transaction ID */
450 : : } RetainDeadTuplesData;
451 : :
452 : : /*
453 : : * The minimum (100ms) and maximum (3 minutes) intervals for advancing
454 : : * non-removable transaction IDs. The maximum interval is a bit arbitrary but
455 : : * is sufficient to not cause any undue network traffic.
456 : : */
457 : : #define MIN_XID_ADVANCE_INTERVAL 100
458 : : #define MAX_XID_ADVANCE_INTERVAL 180000
459 : :
460 : : /* errcontext tracker */
461 : : static ApplyErrorCallbackArg apply_error_callback_arg =
462 : : {
463 : : .command = 0,
464 : : .rel = NULL,
465 : : .remote_attnum = -1,
466 : : .remote_xid = InvalidTransactionId,
467 : : .finish_lsn = InvalidXLogRecPtr,
468 : : .origin_name = NULL,
469 : : };
470 : :
471 : : ErrorContextCallback *apply_error_context_stack = NULL;
472 : :
473 : : MemoryContext ApplyMessageContext = NULL;
474 : : MemoryContext ApplyContext = NULL;
475 : :
476 : : /* per stream context for streaming transactions */
477 : : static MemoryContext LogicalStreamingContext = NULL;
478 : :
479 : : WalReceiverConn *LogRepWorkerWalRcvConn = NULL;
480 : :
481 : : Subscription *MySubscription = NULL;
482 : : static bool MySubscriptionValid = false;
483 : :
484 : : static List *on_commit_wakeup_workers_subids = NIL;
485 : :
486 : : bool in_remote_transaction = false;
487 : : static XLogRecPtr remote_final_lsn = InvalidXLogRecPtr;
488 : :
489 : : /* fields valid only when processing streamed transaction */
490 : : static bool in_streamed_transaction = false;
491 : :
492 : : static TransactionId stream_xid = InvalidTransactionId;
493 : :
494 : : /*
495 : : * The number of changes applied by parallel apply worker during one streaming
496 : : * block.
497 : : */
498 : : static uint32 parallel_stream_nchanges = 0;
499 : :
500 : : /* Are we initializing an apply worker? */
501 : : bool InitializingApplyWorker = false;
502 : :
503 : : /*
504 : : * We enable skipping all data modification changes (INSERT, UPDATE, etc.) for
505 : : * the subscription if the remote transaction's finish LSN matches the subskiplsn.
506 : : * Once we start skipping changes, we don't stop it until we skip all changes of
507 : : * the transaction even if pg_subscription is updated and MySubscription->skiplsn
508 : : * gets changed or reset during that. Also, in streaming transaction cases (streaming = on),
509 : : * we don't skip receiving and spooling the changes since we decide whether or not
510 : : * to skip applying the changes when starting to apply changes. The subskiplsn is
511 : : * cleared after successfully skipping the transaction or applying non-empty
512 : : * transaction. The latter prevents the mistakenly specified subskiplsn from
513 : : * being left. Note that we cannot skip the streaming transactions when using
514 : : * parallel apply workers because we cannot get the finish LSN before applying
515 : : * the changes. So, we don't start parallel apply worker when finish LSN is set
516 : : * by the user.
517 : : */
518 : : static XLogRecPtr skip_xact_finish_lsn = InvalidXLogRecPtr;
519 : : #define is_skipping_changes() (unlikely(XLogRecPtrIsValid(skip_xact_finish_lsn)))
520 : :
521 : : /* BufFile handle of the current streaming file */
522 : : static BufFile *stream_fd = NULL;
523 : :
524 : : /*
525 : : * The remote WAL position that has been applied and flushed locally. We record
526 : : * and use this information both while sending feedback to the server and
527 : : * advancing oldest_nonremovable_xid.
528 : : */
529 : : static XLogRecPtr last_flushpos = InvalidXLogRecPtr;
530 : :
531 : : typedef struct SubXactInfo
532 : : {
533 : : TransactionId xid; /* XID of the subxact */
534 : : int fileno; /* file number in the buffile */
535 : : pgoff_t offset; /* offset in the file */
536 : : } SubXactInfo;
537 : :
538 : : /* Sub-transaction data for the current streaming transaction */
539 : : typedef struct ApplySubXactData
540 : : {
541 : : uint32 nsubxacts; /* number of sub-transactions */
542 : : uint32 nsubxacts_max; /* current capacity of subxacts */
543 : : TransactionId subxact_last; /* xid of the last sub-transaction */
544 : : SubXactInfo *subxacts; /* sub-xact offset in changes file */
545 : : } ApplySubXactData;
546 : :
547 : : static ApplySubXactData subxact_data = {0, 0, InvalidTransactionId, NULL};
548 : :
549 : : static inline void subxact_filename(char *path, Oid subid, TransactionId xid);
550 : : static inline void changes_filename(char *path, Oid subid, TransactionId xid);
551 : :
552 : : /*
553 : : * Information about subtransactions of a given toplevel transaction.
554 : : */
555 : : static void subxact_info_write(Oid subid, TransactionId xid);
556 : : static void subxact_info_read(Oid subid, TransactionId xid);
557 : : static void subxact_info_add(TransactionId xid);
558 : : static inline void cleanup_subxact_info(void);
559 : :
560 : : /*
561 : : * Serialize and deserialize changes for a toplevel transaction.
562 : : */
563 : : static void stream_open_file(Oid subid, TransactionId xid,
564 : : bool first_segment);
565 : : static void stream_write_change(char action, StringInfo s);
566 : : static void stream_open_and_write_change(TransactionId xid, char action, StringInfo s);
567 : : static void stream_close_file(void);
568 : :
569 : : static void send_feedback(XLogRecPtr recvpos, bool force, bool requestReply);
570 : :
571 : : static void maybe_advance_nonremovable_xid(RetainDeadTuplesData *rdt_data,
572 : : bool status_received);
573 : : static bool can_advance_nonremovable_xid(RetainDeadTuplesData *rdt_data);
574 : : static void process_rdt_phase_transition(RetainDeadTuplesData *rdt_data,
575 : : bool status_received);
576 : : static void get_candidate_xid(RetainDeadTuplesData *rdt_data);
577 : : static void request_publisher_status(RetainDeadTuplesData *rdt_data);
578 : : static void wait_for_publisher_status(RetainDeadTuplesData *rdt_data,
579 : : bool status_received);
580 : : static void wait_for_local_flush(RetainDeadTuplesData *rdt_data);
581 : : static bool should_stop_conflict_info_retention(RetainDeadTuplesData *rdt_data);
582 : : static void stop_conflict_info_retention(RetainDeadTuplesData *rdt_data);
583 : : static void resume_conflict_info_retention(RetainDeadTuplesData *rdt_data);
584 : : static bool update_retention_status(bool active);
585 : : static void reset_retention_data_fields(RetainDeadTuplesData *rdt_data);
586 : : static void adjust_xid_advance_interval(RetainDeadTuplesData *rdt_data,
587 : : bool new_xid_found);
588 : :
589 : : static void apply_worker_exit(void);
590 : :
591 : : static void apply_handle_commit_internal(LogicalRepCommitData *commit_data);
592 : : static void apply_handle_insert_internal(ApplyExecutionData *edata,
593 : : ResultRelInfo *relinfo,
594 : : TupleTableSlot *remoteslot);
595 : : static void apply_handle_update_internal(ApplyExecutionData *edata,
596 : : ResultRelInfo *relinfo,
597 : : TupleTableSlot *remoteslot,
598 : : LogicalRepTupleData *newtup,
599 : : Oid localindexoid);
600 : : static void apply_handle_delete_internal(ApplyExecutionData *edata,
601 : : ResultRelInfo *relinfo,
602 : : TupleTableSlot *remoteslot,
603 : : Oid localindexoid);
604 : : static bool FindReplTupleInLocalRel(ApplyExecutionData *edata, Relation localrel,
605 : : LogicalRepRelation *remoterel,
606 : : Oid localidxoid,
607 : : TupleTableSlot *remoteslot,
608 : : TupleTableSlot **localslot);
609 : : static bool FindDeletedTupleInLocalRel(Relation localrel,
610 : : Oid localidxoid,
611 : : TupleTableSlot *remoteslot,
612 : : TransactionId *delete_xid,
613 : : ReplOriginId *delete_origin,
614 : : TimestampTz *delete_time);
615 : : static void apply_handle_tuple_routing(ApplyExecutionData *edata,
616 : : TupleTableSlot *remoteslot,
617 : : LogicalRepTupleData *newtup,
618 : : CmdType operation);
619 : :
620 : : /* Functions for skipping changes */
621 : : static void maybe_start_skipping_changes(XLogRecPtr finish_lsn);
622 : : static void stop_skipping_changes(void);
623 : : static void clear_subscription_skip_lsn(XLogRecPtr finish_lsn);
624 : :
625 : : /* Functions for apply error callback */
626 : : static inline void set_apply_error_context_xact(TransactionId xid, XLogRecPtr lsn);
627 : : static inline void reset_apply_error_context_info(void);
628 : :
629 : : static TransApplyAction get_transaction_apply_action(TransactionId xid,
630 : : ParallelApplyWorkerInfo **winfo);
631 : :
632 : : static void set_wal_receiver_timeout(void);
633 : :
634 : : static void on_exit_clear_xact_state(int code, Datum arg);
635 : :
636 : : /*
637 : : * Form the origin name for the subscription.
638 : : *
639 : : * This is a common function for tablesync and other workers. Tablesync workers
640 : : * must pass a valid relid. Other callers must pass relid = InvalidOid.
641 : : *
642 : : * Return the name in the supplied buffer.
643 : : */
644 : : void
1251 akapila@postgresql.o 645 :CBC 1392 : ReplicationOriginNameForLogicalRep(Oid suboid, Oid relid,
646 : : char *originname, Size szoriginname)
647 : : {
648 [ + + ]: 1392 : if (OidIsValid(relid))
649 : : {
650 : : /* Replication origin name for tablesync workers. */
651 : 787 : snprintf(originname, szoriginname, "pg_%u_%u", suboid, relid);
652 : : }
653 : : else
654 : : {
655 : : /* Replication origin name for non-tablesync workers. */
656 : 605 : snprintf(originname, szoriginname, "pg_%u", suboid);
657 : : }
658 : 1392 : }
659 : :
660 : : /*
661 : : * Should this worker apply changes for given relation.
662 : : *
663 : : * This is mainly needed for initial relation data sync as that runs in
664 : : * separate worker process running in parallel and we need some way to skip
665 : : * changes coming to the leader apply worker during the sync of a table.
666 : : *
667 : : * Note we need to do smaller or equals comparison for SYNCDONE state because
668 : : * it might hold position of end of initial slot consistent point WAL
669 : : * record + 1 (ie start of next record) and next record can be COMMIT of
670 : : * transaction we are now processing (which is what we set remote_final_lsn
671 : : * to in apply_handle_begin).
672 : : *
673 : : * Note that for streaming transactions that are being applied in the parallel
674 : : * apply worker, we disallow applying changes if the target table in the
675 : : * subscription is not in the READY state, because we cannot decide whether to
676 : : * apply the change as we won't know remote_final_lsn by that time.
677 : : *
678 : : * We already checked this in pa_can_start() before assigning the
679 : : * streaming transaction to the parallel worker, but it also needs to be
680 : : * checked here because if the user executes ALTER SUBSCRIPTION ... REFRESH
681 : : * PUBLICATION in parallel, the new table can be added to pg_subscription_rel
682 : : * while applying this transaction.
683 : : */
684 : : static bool
3279 peter_e@gmx.net 685 : 148364 : should_apply_changes_for_rel(LogicalRepRelMapEntry *rel)
686 : : {
936 akapila@postgresql.o 687 [ - + + - : 148364 : switch (MyLogicalRepWorker->type)
- - ]
688 : : {
936 akapila@postgresql.o 689 :UBC 0 : case WORKERTYPE_TABLESYNC:
690 : 0 : return MyLogicalRepWorker->relid == rel->localreloid;
691 : :
936 akapila@postgresql.o 692 :CBC 68521 : case WORKERTYPE_PARALLEL_APPLY:
693 : : /* We don't synchronize rel's that are in unknown state. */
694 [ - + ]: 68521 : if (rel->state != SUBREL_STATE_READY &&
936 akapila@postgresql.o 695 [ # # ]:UBC 0 : rel->state != SUBREL_STATE_UNKNOWN)
696 [ # # ]: 0 : ereport(ERROR,
697 : : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
698 : : errmsg("logical replication parallel apply worker for subscription \"%s\" will stop",
699 : : MySubscription->name),
700 : : errdetail("Cannot handle streamed replication transactions using parallel apply workers until all tables have been synchronized.")));
701 : :
936 akapila@postgresql.o 702 :CBC 68521 : return rel->state == SUBREL_STATE_READY;
703 : :
704 : 79843 : case WORKERTYPE_APPLY:
705 [ + + ]: 79927 : return (rel->state == SUBREL_STATE_READY ||
706 [ + + ]: 84 : (rel->state == SUBREL_STATE_SYNCDONE &&
707 [ + - ]: 33 : rel->statelsn <= remote_final_lsn));
708 : :
130 akapila@postgresql.o 709 :UNC 0 : case WORKERTYPE_SEQUENCESYNC:
710 : : /* Should never happen. */
711 [ # # ]: 0 : elog(ERROR, "sequence synchronization worker is not expected to apply changes");
712 : : break;
713 : :
936 akapila@postgresql.o 714 :UBC 0 : case WORKERTYPE_UNKNOWN:
715 : : /* Should never happen. */
716 [ # # ]: 0 : elog(ERROR, "Unknown worker type");
717 : : }
718 : :
719 : 0 : return false; /* dummy for compiler */
720 : : }
721 : :
722 : : /*
723 : : * Begin one step (one INSERT, UPDATE, etc) of a replication transaction.
724 : : *
725 : : * Start a transaction, if this is the first step (else we keep using the
726 : : * existing transaction).
727 : : * Also provide a global snapshot and ensure we run in ApplyMessageContext.
728 : : */
729 : : static void
1739 tgl@sss.pgh.pa.us 730 :CBC 148824 : begin_replication_step(void)
731 : : {
732 : 148824 : SetCurrentStatementStartTimestamp();
733 : :
734 [ + + ]: 148824 : if (!IsTransactionState())
735 : : {
736 : 977 : StartTransactionCommand();
737 : 977 : maybe_reread_subscription();
738 : : }
739 : :
740 : 148821 : PushActiveSnapshot(GetTransactionSnapshot());
741 : :
3232 peter_e@gmx.net 742 : 148821 : MemoryContextSwitchTo(ApplyMessageContext);
1739 tgl@sss.pgh.pa.us 743 : 148821 : }
744 : :
745 : : /*
746 : : * Finish up one step of a replication transaction.
747 : : * Callers of begin_replication_step() must also call this.
748 : : *
749 : : * We don't close out the transaction here, but we should increment
750 : : * the command counter to make the effects of this step visible.
751 : : */
752 : : static void
753 : 148766 : end_replication_step(void)
754 : : {
755 : 148766 : PopActiveSnapshot();
756 : :
757 : 148766 : CommandCounterIncrement();
3342 peter_e@gmx.net 758 : 148766 : }
759 : :
760 : : /*
761 : : * Handle streamed transactions for both the leader apply worker and the
762 : : * parallel apply workers.
763 : : *
764 : : * In the streaming case (receiving a block of the streamed transaction), for
765 : : * serialize mode, simply redirect it to a file for the proper toplevel
766 : : * transaction, and for parallel mode, the leader apply worker will send the
767 : : * changes to parallel apply workers and the parallel apply worker will define
768 : : * savepoints if needed. (LOGICAL_REP_MSG_RELATION or LOGICAL_REP_MSG_TYPE
769 : : * messages will be applied by both leader apply worker and parallel apply
770 : : * workers).
771 : : *
772 : : * Returns true for streamed transactions (when the change is either serialized
773 : : * to file or sent to parallel apply worker), false otherwise (regular mode or
774 : : * needs to be processed by parallel apply worker).
775 : : *
776 : : * Exception: If the message being processed is LOGICAL_REP_MSG_RELATION
777 : : * or LOGICAL_REP_MSG_TYPE, return false even if the message needs to be sent
778 : : * to a parallel apply worker.
779 : : */
780 : : static bool
1935 akapila@postgresql.o 781 : 324711 : handle_streamed_transaction(LogicalRepMsgType action, StringInfo s)
782 : : {
783 : : TransactionId current_xid;
784 : : ParallelApplyWorkerInfo *winfo;
785 : : TransApplyAction apply_action;
786 : : StringInfoData original_msg;
787 : :
1161 788 : 324711 : apply_action = get_transaction_apply_action(stream_xid, &winfo);
789 : :
790 : : /* not in streaming mode */
791 [ + + ]: 324711 : if (apply_action == TRANS_LEADER_APPLY)
2019 792 : 80251 : return false;
793 : :
794 [ - + ]: 244460 : Assert(TransactionIdIsValid(stream_xid));
795 : :
796 : : /*
797 : : * The parallel apply worker needs the xid in this message to decide
798 : : * whether to define a savepoint, so save the original message that has
799 : : * not moved the cursor after the xid. We will serialize this message to a
800 : : * file in PARTIAL_SERIALIZE mode.
801 : : */
1161 802 : 244460 : original_msg = *s;
803 : :
804 : : /*
805 : : * We should have received XID of the subxact as the first part of the
806 : : * message, so extract it.
807 : : */
808 : 244460 : current_xid = pq_getmsgint(s, 4);
809 : :
810 [ - + ]: 244460 : if (!TransactionIdIsValid(current_xid))
1737 tgl@sss.pgh.pa.us 811 [ # # ]:UBC 0 : ereport(ERROR,
812 : : (errcode(ERRCODE_PROTOCOL_VIOLATION),
813 : : errmsg_internal("invalid transaction ID in streamed replication transaction")));
814 : :
1161 akapila@postgresql.o 815 [ + + + + :CBC 244460 : switch (apply_action)
- ]
816 : : {
817 : 102513 : case TRANS_LEADER_SERIALIZE:
818 [ - + ]: 102513 : Assert(stream_fd);
819 : :
820 : : /* Add the new subxact to the array (unless already there). */
821 : 102513 : subxact_info_add(current_xid);
822 : :
823 : : /* Write the change to the current file */
824 : 102513 : stream_write_change(action, s);
825 : 102513 : return true;
826 : :
827 : 68390 : case TRANS_LEADER_SEND_TO_PARALLEL:
828 [ - + ]: 68390 : Assert(winfo);
829 : :
830 : : /*
831 : : * XXX The publisher side doesn't always send relation/type update
832 : : * messages after the streaming transaction, so also update the
833 : : * relation/type in leader apply worker. See function
834 : : * cleanup_rel_sync_cache.
835 : : */
836 [ + - ]: 68390 : if (pa_send_data(winfo, s->len, s->data))
837 [ + + + - ]: 68390 : return (action != LOGICAL_REP_MSG_RELATION &&
838 : : action != LOGICAL_REP_MSG_TYPE);
839 : :
840 : : /*
841 : : * Switch to serialize mode when we are not able to send the
842 : : * change to parallel apply worker.
843 : : */
1161 akapila@postgresql.o 844 :UBC 0 : pa_switch_to_partial_serialize(winfo, false);
845 : :
846 : : pg_fallthrough;
1161 akapila@postgresql.o 847 :CBC 5006 : case TRANS_LEADER_PARTIAL_SERIALIZE:
848 : 5006 : stream_write_change(action, &original_msg);
849 : :
850 : : /* Same reason as TRANS_LEADER_SEND_TO_PARALLEL case. */
851 [ + + + - ]: 5006 : return (action != LOGICAL_REP_MSG_RELATION &&
852 : : action != LOGICAL_REP_MSG_TYPE);
853 : :
854 : 68551 : case TRANS_PARALLEL_APPLY:
855 : 68551 : parallel_stream_nchanges += 1;
856 : :
857 : : /* Define a savepoint for a subxact if needed. */
858 : 68551 : pa_start_subtrans(current_xid, stream_xid);
859 : 68551 : return false;
860 : :
1161 akapila@postgresql.o 861 :UBC 0 : default:
1056 msawada@postgresql.o 862 [ # # ]: 0 : elog(ERROR, "unexpected apply action: %d", (int) apply_action);
863 : : return false; /* silence compiler warning */
864 : : }
865 : : }
866 : :
867 : : /*
868 : : * Executor state preparation for evaluation of constraint expressions,
869 : : * indexes and triggers for the specified relation.
870 : : *
871 : : * Note that the caller must open and close any indexes to be updated.
872 : : */
873 : : static ApplyExecutionData *
1758 tgl@sss.pgh.pa.us 874 :CBC 148283 : create_edata_for_relation(LogicalRepRelMapEntry *rel)
875 : : {
876 : : ApplyExecutionData *edata;
877 : : EState *estate;
878 : : RangeTblEntry *rte;
1105 879 : 148283 : List *perminfos = NIL;
880 : : ResultRelInfo *resultRelInfo;
881 : :
95 michael@paquier.xyz 882 :GNC 148283 : edata = palloc0_object(ApplyExecutionData);
1758 tgl@sss.pgh.pa.us 883 :CBC 148283 : edata->targetRel = rel;
884 : :
885 : 148283 : edata->estate = estate = CreateExecutorState();
886 : :
3342 peter_e@gmx.net 887 : 148283 : rte = makeNode(RangeTblEntry);
888 : 148283 : rte->rtekind = RTE_RELATION;
889 : 148283 : rte->relid = RelationGetRelid(rel->localrel);
890 : 148283 : rte->relkind = rel->localrel->rd_rel->relkind;
2723 tgl@sss.pgh.pa.us 891 : 148283 : rte->rellockmode = AccessShareLock;
892 : :
1105 893 : 148283 : addRTEPermissionInfo(&perminfos, rte);
894 : :
401 amitlan@postgresql.o 895 : 148283 : ExecInitRangeTable(estate, list_make1(rte), perminfos,
896 : : bms_make_singleton(1));
897 : :
1758 tgl@sss.pgh.pa.us 898 : 148283 : edata->targetRelInfo = resultRelInfo = makeNode(ResultRelInfo);
899 : :
900 : : /*
901 : : * Use Relation opened by logicalrep_rel_open() instead of opening it
902 : : * again.
903 : : */
904 : 148283 : InitResultRelInfo(resultRelInfo, rel->localrel, 1, NULL, 0);
905 : :
906 : : /*
907 : : * We put the ResultRelInfo in the es_opened_result_relations list, even
908 : : * though we don't populate the es_result_relations array. That's a bit
909 : : * bogus, but it's enough to make ExecGetTriggerResultRel() find them.
910 : : *
911 : : * ExecOpenIndices() is not called here either, each execution path doing
912 : : * an apply operation being responsible for that.
913 : : */
1788 michael@paquier.xyz 914 : 148283 : estate->es_opened_result_relations =
1758 tgl@sss.pgh.pa.us 915 : 148283 : lappend(estate->es_opened_result_relations, resultRelInfo);
916 : :
3035 simon@2ndQuadrant.co 917 : 148283 : estate->es_output_cid = GetCurrentCommandId(true);
918 : :
919 : : /* Prepare to catch AFTER triggers. */
3299 peter_e@gmx.net 920 : 148283 : AfterTriggerBeginQuery();
921 : :
922 : : /* other fields of edata remain NULL for now */
923 : :
1758 tgl@sss.pgh.pa.us 924 : 148283 : return edata;
925 : : }
926 : :
927 : : /*
928 : : * Finish any operations related to the executor state created by
929 : : * create_edata_for_relation().
930 : : */
931 : : static void
932 : 148236 : finish_edata(ApplyExecutionData *edata)
933 : : {
934 : 148236 : EState *estate = edata->estate;
935 : :
936 : : /* Handle any queued AFTER triggers. */
1788 michael@paquier.xyz 937 : 148236 : AfterTriggerEndQuery(estate);
938 : :
939 : : /* Shut down tuple routing, if any was done. */
1758 tgl@sss.pgh.pa.us 940 [ + + ]: 148236 : if (edata->proute)
941 : 74 : ExecCleanupTupleRouting(edata->mtstate, edata->proute);
942 : :
943 : : /*
944 : : * Cleanup. It might seem that we should call ExecCloseResultRelations()
945 : : * here, but we intentionally don't. It would close the rel we added to
946 : : * es_opened_result_relations above, which is wrong because we took no
947 : : * corresponding refcount. We rely on ExecCleanupTupleRouting() to close
948 : : * any other relations opened during execution.
949 : : */
1788 michael@paquier.xyz 950 : 148236 : ExecResetTupleTable(estate->es_tupleTable, false);
951 : 148236 : FreeExecutorState(estate);
1758 tgl@sss.pgh.pa.us 952 : 148236 : pfree(edata);
1788 michael@paquier.xyz 953 : 148236 : }
954 : :
955 : : /*
956 : : * Executes default values for columns for which we can't map to remote
957 : : * relation columns.
958 : : *
959 : : * This allows us to support tables which have more columns on the downstream
960 : : * than on the upstream.
961 : : */
962 : : static void
3342 peter_e@gmx.net 963 : 76021 : slot_fill_defaults(LogicalRepRelMapEntry *rel, EState *estate,
964 : : TupleTableSlot *slot)
965 : : {
966 : 76021 : TupleDesc desc = RelationGetDescr(rel->localrel);
967 : 76021 : int num_phys_attrs = desc->natts;
968 : : int i;
969 : : int attnum,
970 : 76021 : num_defaults = 0;
971 : : int *defmap;
972 : : ExprState **defexprs;
973 : : ExprContext *econtext;
974 : :
975 [ + - ]: 76021 : econtext = GetPerTupleExprContext(estate);
976 : :
977 : : /* We got all the data via replication, no need to evaluate anything. */
978 [ + + ]: 76021 : if (num_phys_attrs == rel->remoterel.natts)
979 : 35876 : return;
980 : :
9 msawada@postgresql.o 981 :GNC 40145 : defmap = palloc_array(int, num_phys_attrs);
982 : 40145 : defexprs = palloc_array(ExprState *, num_phys_attrs);
983 : :
2279 michael@paquier.xyz 984 [ - + ]:CBC 40145 : Assert(rel->attrmap->maplen == num_phys_attrs);
3342 peter_e@gmx.net 985 [ + + ]: 210663 : for (attnum = 0; attnum < num_phys_attrs; attnum++)
986 : : {
144 drowley@postgresql.o 987 :GNC 170518 : CompactAttribute *cattr = TupleDescCompactAttr(desc, attnum);
988 : : Expr *defexpr;
989 : :
990 [ + - + + ]: 170518 : if (cattr->attisdropped || cattr->attgenerated)
3342 peter_e@gmx.net 991 :CBC 9 : continue;
992 : :
2279 michael@paquier.xyz 993 [ + + ]: 170509 : if (rel->attrmap->attnums[attnum] >= 0)
3342 peter_e@gmx.net 994 : 92268 : continue;
995 : :
996 : 78241 : defexpr = (Expr *) build_column_default(rel->localrel, attnum + 1);
997 : :
998 [ + + ]: 78241 : if (defexpr != NULL)
999 : : {
1000 : : /* Run the expression through planner */
1001 : 70131 : defexpr = expression_planner(defexpr);
1002 : :
1003 : : /* Initialize executable expression in copycontext */
1004 : 70131 : defexprs[num_defaults] = ExecInitExpr(defexpr, NULL);
1005 : 70131 : defmap[num_defaults] = attnum;
1006 : 70131 : num_defaults++;
1007 : : }
1008 : : }
1009 : :
1010 [ + + ]: 110276 : for (i = 0; i < num_defaults; i++)
1011 : 70131 : slot->tts_values[defmap[i]] =
1012 : 70131 : ExecEvalExpr(defexprs[i], econtext, &slot->tts_isnull[defmap[i]]);
1013 : : }
1014 : :
1015 : : /*
1016 : : * Store tuple data into slot.
1017 : : *
1018 : : * Incoming data can be either text or binary format.
1019 : : */
1020 : : static void
2066 tgl@sss.pgh.pa.us 1021 : 148297 : slot_store_data(TupleTableSlot *slot, LogicalRepRelMapEntry *rel,
1022 : : LogicalRepTupleData *tupleData)
1023 : : {
3224 bruce@momjian.us 1024 : 148297 : int natts = slot->tts_tupleDescriptor->natts;
1025 : : int i;
1026 : :
3342 peter_e@gmx.net 1027 : 148297 : ExecClearTuple(slot);
1028 : :
1029 : : /* Call the "in" function for each non-dropped, non-null attribute */
2279 michael@paquier.xyz 1030 [ - + ]: 148297 : Assert(natts == rel->attrmap->maplen);
3342 peter_e@gmx.net 1031 [ + + ]: 658186 : for (i = 0; i < natts; i++)
1032 : : {
3129 andres@anarazel.de 1033 : 509889 : Form_pg_attribute att = TupleDescAttr(slot->tts_tupleDescriptor, i);
2279 michael@paquier.xyz 1034 : 509889 : int remoteattnum = rel->attrmap->attnums[i];
1035 : :
2066 tgl@sss.pgh.pa.us 1036 [ + + + + ]: 509889 : if (!att->attisdropped && remoteattnum >= 0)
3342 peter_e@gmx.net 1037 : 302972 : {
2066 tgl@sss.pgh.pa.us 1038 : 302972 : StringInfo colvalue = &tupleData->colvalues[remoteattnum];
1039 : :
2064 1040 [ - + ]: 302972 : Assert(remoteattnum < tupleData->ncols);
1041 : :
1042 : : /* Set attnum for error callback */
1661 akapila@postgresql.o 1043 : 302972 : apply_error_callback_arg.remote_attnum = remoteattnum;
1044 : :
2066 tgl@sss.pgh.pa.us 1045 [ + + ]: 302972 : if (tupleData->colstatus[remoteattnum] == LOGICALREP_COLUMN_TEXT)
1046 : : {
1047 : : Oid typinput;
1048 : : Oid typioparam;
1049 : :
1050 : 142508 : getTypeInputInfo(att->atttypid, &typinput, &typioparam);
1051 : 285016 : slot->tts_values[i] =
1052 : 142508 : OidInputFunctionCall(typinput, colvalue->data,
1053 : : typioparam, att->atttypmod);
1054 : 142508 : slot->tts_isnull[i] = false;
1055 : : }
1056 [ + + ]: 160464 : else if (tupleData->colstatus[remoteattnum] == LOGICALREP_COLUMN_BINARY)
1057 : : {
1058 : : Oid typreceive;
1059 : : Oid typioparam;
1060 : :
1061 : : /*
1062 : : * In some code paths we may be asked to re-parse the same
1063 : : * tuple data. Reset the StringInfo's cursor so that works.
1064 : : */
1065 : 110134 : colvalue->cursor = 0;
1066 : :
1067 : 110134 : getTypeBinaryInputInfo(att->atttypid, &typreceive, &typioparam);
1068 : 220268 : slot->tts_values[i] =
1069 : 110134 : OidReceiveFunctionCall(typreceive, colvalue,
1070 : : typioparam, att->atttypmod);
1071 : :
1072 : : /* Trouble if it didn't eat the whole buffer */
1073 [ - + ]: 110134 : if (colvalue->cursor != colvalue->len)
2066 tgl@sss.pgh.pa.us 1074 [ # # ]:UBC 0 : ereport(ERROR,
1075 : : (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
1076 : : errmsg("incorrect binary data format in logical replication column %d",
1077 : : remoteattnum + 1)));
2066 tgl@sss.pgh.pa.us 1078 :CBC 110134 : slot->tts_isnull[i] = false;
1079 : : }
1080 : : else
1081 : : {
1082 : : /*
1083 : : * NULL value from remote. (We don't expect to see
1084 : : * LOGICALREP_COLUMN_UNCHANGED here, but if we do, treat it as
1085 : : * NULL.)
1086 : : */
1087 : 50330 : slot->tts_values[i] = (Datum) 0;
1088 : 50330 : slot->tts_isnull[i] = true;
1089 : : }
1090 : :
1091 : : /* Reset attnum for error callback */
1661 akapila@postgresql.o 1092 : 302972 : apply_error_callback_arg.remote_attnum = -1;
1093 : : }
1094 : : else
1095 : : {
1096 : : /*
1097 : : * We assign NULL to dropped attributes and missing values
1098 : : * (missing values should be later filled using
1099 : : * slot_fill_defaults).
1100 : : */
3342 peter_e@gmx.net 1101 : 206917 : slot->tts_values[i] = (Datum) 0;
1102 : 206917 : slot->tts_isnull[i] = true;
1103 : : }
1104 : : }
1105 : :
1106 : 148297 : ExecStoreVirtualTuple(slot);
1107 : 148297 : }
1108 : :
1109 : : /*
1110 : : * Replace updated columns with data from the LogicalRepTupleData struct.
1111 : : * This is somewhat similar to heap_modify_tuple but also calls the type
1112 : : * input functions on the user data.
1113 : : *
1114 : : * "slot" is filled with a copy of the tuple in "srcslot", replacing
1115 : : * columns provided in "tupleData" and leaving others as-is.
1116 : : *
1117 : : * Caution: unreplaced pass-by-ref columns in "slot" will point into the
1118 : : * storage for "srcslot". This is OK for current usage, but someday we may
1119 : : * need to materialize "slot" at the end to make it independent of "srcslot".
1120 : : */
1121 : : static void
2066 tgl@sss.pgh.pa.us 1122 : 31924 : slot_modify_data(TupleTableSlot *slot, TupleTableSlot *srcslot,
1123 : : LogicalRepRelMapEntry *rel,
1124 : : LogicalRepTupleData *tupleData)
1125 : : {
3224 bruce@momjian.us 1126 : 31924 : int natts = slot->tts_tupleDescriptor->natts;
1127 : : int i;
1128 : :
1129 : : /* We'll fill "slot" with a virtual tuple, so we must start with ... */
3342 peter_e@gmx.net 1130 : 31924 : ExecClearTuple(slot);
1131 : :
1132 : : /*
1133 : : * Copy all the column data from srcslot, so that we'll have valid values
1134 : : * for unreplaced columns.
1135 : : */
2305 tgl@sss.pgh.pa.us 1136 [ - + ]: 31924 : Assert(natts == srcslot->tts_tupleDescriptor->natts);
1137 : 31924 : slot_getallattrs(srcslot);
1138 : 31924 : memcpy(slot->tts_values, srcslot->tts_values, natts * sizeof(Datum));
1139 : 31924 : memcpy(slot->tts_isnull, srcslot->tts_isnull, natts * sizeof(bool));
1140 : :
1141 : : /* Call the "in" function for each replaced attribute */
2279 michael@paquier.xyz 1142 [ - + ]: 31924 : Assert(natts == rel->attrmap->maplen);
3342 peter_e@gmx.net 1143 [ + + ]: 159280 : for (i = 0; i < natts; i++)
1144 : : {
3129 andres@anarazel.de 1145 : 127356 : Form_pg_attribute att = TupleDescAttr(slot->tts_tupleDescriptor, i);
2279 michael@paquier.xyz 1146 : 127356 : int remoteattnum = rel->attrmap->attnums[i];
1147 : :
3054 peter_e@gmx.net 1148 [ + + ]: 127356 : if (remoteattnum < 0)
3342 1149 : 58519 : continue;
1150 : :
2064 tgl@sss.pgh.pa.us 1151 [ - + ]: 68837 : Assert(remoteattnum < tupleData->ncols);
1152 : :
2066 1153 [ + - ]: 68837 : if (tupleData->colstatus[remoteattnum] != LOGICALREP_COLUMN_UNCHANGED)
1154 : : {
1155 : 68837 : StringInfo colvalue = &tupleData->colvalues[remoteattnum];
1156 : :
1157 : : /* Set attnum for error callback */
1661 akapila@postgresql.o 1158 : 68837 : apply_error_callback_arg.remote_attnum = remoteattnum;
1159 : :
2066 tgl@sss.pgh.pa.us 1160 [ + + ]: 68837 : if (tupleData->colstatus[remoteattnum] == LOGICALREP_COLUMN_TEXT)
1161 : : {
1162 : : Oid typinput;
1163 : : Oid typioparam;
1164 : :
1165 : 25433 : getTypeInputInfo(att->atttypid, &typinput, &typioparam);
1166 : 50866 : slot->tts_values[i] =
1167 : 25433 : OidInputFunctionCall(typinput, colvalue->data,
1168 : : typioparam, att->atttypmod);
1169 : 25433 : slot->tts_isnull[i] = false;
1170 : : }
1171 [ + + ]: 43404 : else if (tupleData->colstatus[remoteattnum] == LOGICALREP_COLUMN_BINARY)
1172 : : {
1173 : : Oid typreceive;
1174 : : Oid typioparam;
1175 : :
1176 : : /*
1177 : : * In some code paths we may be asked to re-parse the same
1178 : : * tuple data. Reset the StringInfo's cursor so that works.
1179 : : */
1180 : 43356 : colvalue->cursor = 0;
1181 : :
1182 : 43356 : getTypeBinaryInputInfo(att->atttypid, &typreceive, &typioparam);
1183 : 86712 : slot->tts_values[i] =
1184 : 43356 : OidReceiveFunctionCall(typreceive, colvalue,
1185 : : typioparam, att->atttypmod);
1186 : :
1187 : : /* Trouble if it didn't eat the whole buffer */
1188 [ - + ]: 43356 : if (colvalue->cursor != colvalue->len)
2066 tgl@sss.pgh.pa.us 1189 [ # # ]:UBC 0 : ereport(ERROR,
1190 : : (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
1191 : : errmsg("incorrect binary data format in logical replication column %d",
1192 : : remoteattnum + 1)));
2066 tgl@sss.pgh.pa.us 1193 :CBC 43356 : slot->tts_isnull[i] = false;
1194 : : }
1195 : : else
1196 : : {
1197 : : /* must be LOGICALREP_COLUMN_NULL */
1198 : 48 : slot->tts_values[i] = (Datum) 0;
1199 : 48 : slot->tts_isnull[i] = true;
1200 : : }
1201 : :
1202 : : /* Reset attnum for error callback */
1661 akapila@postgresql.o 1203 : 68837 : apply_error_callback_arg.remote_attnum = -1;
1204 : : }
1205 : : }
1206 : :
1207 : : /* And finally, declare that "slot" contains a valid virtual tuple */
3342 peter_e@gmx.net 1208 : 31924 : ExecStoreVirtualTuple(slot);
1209 : 31924 : }
1210 : :
1211 : : /*
1212 : : * Handle BEGIN message.
1213 : : */
1214 : : static void
1215 : 498 : apply_handle_begin(StringInfo s)
1216 : : {
1217 : : LogicalRepBeginData begin_data;
1218 : :
1219 : : /* There must not be an active streaming transaction. */
1153 akapila@postgresql.o 1220 [ - + ]: 498 : Assert(!TransactionIdIsValid(stream_xid));
1221 : :
3342 peter_e@gmx.net 1222 : 498 : logicalrep_read_begin(s, &begin_data);
1468 akapila@postgresql.o 1223 : 498 : set_apply_error_context_xact(begin_data.xid, begin_data.final_lsn);
1224 : :
3279 peter_e@gmx.net 1225 : 498 : remote_final_lsn = begin_data.final_lsn;
1226 : :
1454 akapila@postgresql.o 1227 : 498 : maybe_start_skipping_changes(begin_data.final_lsn);
1228 : :
3342 peter_e@gmx.net 1229 : 498 : in_remote_transaction = true;
1230 : :
1231 : 498 : pgstat_report_activity(STATE_RUNNING, NULL);
1232 : 498 : }
1233 : :
1234 : : /*
1235 : : * Handle COMMIT message.
1236 : : *
1237 : : * TODO, support tracking of multiple origins
1238 : : */
1239 : : static void
1240 : 442 : apply_handle_commit(StringInfo s)
1241 : : {
1242 : : LogicalRepCommitData commit_data;
1243 : :
1244 : 442 : logicalrep_read_commit(s, &commit_data);
1245 : :
1737 tgl@sss.pgh.pa.us 1246 [ - + ]: 442 : if (commit_data.commit_lsn != remote_final_lsn)
1737 tgl@sss.pgh.pa.us 1247 [ # # ]:UBC 0 : ereport(ERROR,
1248 : : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1249 : : errmsg_internal("incorrect commit LSN %X/%08X in commit message (expected %X/%08X)",
1250 : : LSN_FORMAT_ARGS(commit_data.commit_lsn),
1251 : : LSN_FORMAT_ARGS(remote_final_lsn))));
1252 : :
1689 akapila@postgresql.o 1253 :CBC 442 : apply_handle_commit_internal(&commit_data);
1254 : :
1255 : : /*
1256 : : * Process any tables that are being synchronized in parallel, as well as
1257 : : * any newly added tables or sequences.
1258 : : */
150 akapila@postgresql.o 1259 :GNC 442 : ProcessSyncingRelations(commit_data.end_lsn);
1260 : :
3342 peter_e@gmx.net 1261 :CBC 442 : pgstat_report_activity(STATE_IDLE, NULL);
1661 akapila@postgresql.o 1262 : 442 : reset_apply_error_context_info();
3342 peter_e@gmx.net 1263 : 442 : }
1264 : :
1265 : : /*
1266 : : * Handle BEGIN PREPARE message.
1267 : : */
1268 : : static void
1705 akapila@postgresql.o 1269 : 17 : apply_handle_begin_prepare(StringInfo s)
1270 : : {
1271 : : LogicalRepPreparedTxnData begin_data;
1272 : :
1273 : : /* Tablesync should never receive prepare. */
1274 [ - + ]: 17 : if (am_tablesync_worker())
1705 akapila@postgresql.o 1275 [ # # ]:UBC 0 : ereport(ERROR,
1276 : : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1277 : : errmsg_internal("tablesync worker received a BEGIN PREPARE message")));
1278 : :
1279 : : /* There must not be an active streaming transaction. */
1153 akapila@postgresql.o 1280 [ - + ]:CBC 17 : Assert(!TransactionIdIsValid(stream_xid));
1281 : :
1705 1282 : 17 : logicalrep_read_begin_prepare(s, &begin_data);
1468 1283 : 17 : set_apply_error_context_xact(begin_data.xid, begin_data.prepare_lsn);
1284 : :
1705 1285 : 17 : remote_final_lsn = begin_data.prepare_lsn;
1286 : :
1454 1287 : 17 : maybe_start_skipping_changes(begin_data.prepare_lsn);
1288 : :
1705 1289 : 17 : in_remote_transaction = true;
1290 : :
1291 : 17 : pgstat_report_activity(STATE_RUNNING, NULL);
1292 : 17 : }
1293 : :
1294 : : /*
1295 : : * Common function to prepare the GID.
1296 : : */
1297 : : static void
1690 1298 : 26 : apply_handle_prepare_internal(LogicalRepPreparedTxnData *prepare_data)
1299 : : {
1300 : : char gid[GIDSIZE];
1301 : :
1302 : : /*
1303 : : * Compute unique GID for two_phase transactions. We don't use GID of
1304 : : * prepared transaction sent by server as that can lead to deadlock when
1305 : : * we have multiple subscriptions from same node point to publications on
1306 : : * the same node. See comments atop worker.c
1307 : : */
1308 : 26 : TwoPhaseTransactionGid(MySubscription->oid, prepare_data->xid,
1309 : : gid, sizeof(gid));
1310 : :
1311 : : /*
1312 : : * BeginTransactionBlock is necessary to balance the EndTransactionBlock
1313 : : * called within the PrepareTransactionBlock below.
1314 : : */
1161 1315 [ + - ]: 26 : if (!IsTransactionBlock())
1316 : : {
1317 : 26 : BeginTransactionBlock();
1318 : 26 : CommitTransactionCommand(); /* Completes the preceding Begin command. */
1319 : : }
1320 : :
1321 : : /*
1322 : : * Update origin state so we can restart streaming from correct position
1323 : : * in case of crash.
1324 : : */
46 msawada@postgresql.o 1325 :GNC 26 : replorigin_xact_state.origin_lsn = prepare_data->end_lsn;
1326 : 26 : replorigin_xact_state.origin_timestamp = prepare_data->prepare_time;
1327 : :
1690 akapila@postgresql.o 1328 :CBC 26 : PrepareTransactionBlock(gid);
1329 : 26 : }
1330 : :
1331 : : /*
1332 : : * Handle PREPARE message.
1333 : : */
1334 : : static void
1705 1335 : 16 : apply_handle_prepare(StringInfo s)
1336 : : {
1337 : : LogicalRepPreparedTxnData prepare_data;
1338 : :
1339 : 16 : logicalrep_read_prepare(s, &prepare_data);
1340 : :
1341 [ - + ]: 16 : if (prepare_data.prepare_lsn != remote_final_lsn)
1705 akapila@postgresql.o 1342 [ # # ]:UBC 0 : ereport(ERROR,
1343 : : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1344 : : errmsg_internal("incorrect prepare LSN %X/%08X in prepare message (expected %X/%08X)",
1345 : : LSN_FORMAT_ARGS(prepare_data.prepare_lsn),
1346 : : LSN_FORMAT_ARGS(remote_final_lsn))));
1347 : :
1348 : : /*
1349 : : * Unlike commit, here, we always prepare the transaction even though no
1350 : : * change has happened in this transaction or all changes are skipped. It
1351 : : * is done this way because at commit prepared time, we won't know whether
1352 : : * we have skipped preparing a transaction because of those reasons.
1353 : : *
1354 : : * XXX, We can optimize such that at commit prepared time, we first check
1355 : : * whether we have prepared the transaction or not but that doesn't seem
1356 : : * worthwhile because such cases shouldn't be common.
1357 : : */
1705 akapila@postgresql.o 1358 :CBC 16 : begin_replication_step();
1359 : :
1690 1360 : 16 : apply_handle_prepare_internal(&prepare_data);
1361 : :
1705 1362 : 16 : end_replication_step();
1363 : 16 : CommitTransactionCommand();
1364 : 15 : pgstat_report_stat(false);
1365 : :
1366 : : /*
1367 : : * It is okay not to set the local_end LSN for the prepare because we
1368 : : * always flush the prepare record. So, we can send the acknowledgment of
1369 : : * the remote_end LSN as soon as prepare is finished.
1370 : : *
1371 : : * XXX For the sake of consistency with commit, we could have set it with
1372 : : * the LSN of prepare but as of now we don't track that value similar to
1373 : : * XactLastCommitEnd, and adding it for this purpose doesn't seems worth
1374 : : * it.
1375 : : */
583 1376 : 15 : store_flush_position(prepare_data.end_lsn, InvalidXLogRecPtr);
1377 : :
1705 1378 : 15 : in_remote_transaction = false;
1379 : :
1380 : : /*
1381 : : * Process any tables that are being synchronized in parallel, as well as
1382 : : * any newly added tables or sequences.
1383 : : */
150 akapila@postgresql.o 1384 :GNC 15 : ProcessSyncingRelations(prepare_data.end_lsn);
1385 : :
1386 : : /*
1387 : : * Since we have already prepared the transaction, in a case where the
1388 : : * server crashes before clearing the subskiplsn, it will be left but the
1389 : : * transaction won't be resent. But that's okay because it's a rare case
1390 : : * and the subskiplsn will be cleared when finishing the next transaction.
1391 : : */
1454 akapila@postgresql.o 1392 :CBC 15 : stop_skipping_changes();
1393 : 15 : clear_subscription_skip_lsn(prepare_data.prepare_lsn);
1394 : :
1705 1395 : 15 : pgstat_report_activity(STATE_IDLE, NULL);
1661 1396 : 15 : reset_apply_error_context_info();
1705 1397 : 15 : }
1398 : :
1399 : : /*
1400 : : * Handle a COMMIT PREPARED of a previously PREPARED transaction.
1401 : : *
1402 : : * Note that we don't need to wait here if the transaction was prepared in a
1403 : : * parallel apply worker. In that case, we have already waited for the prepare
1404 : : * to finish in apply_handle_stream_prepare() which will ensure all the
1405 : : * operations in that transaction have happened in the subscriber, so no
1406 : : * concurrent transaction can cause deadlock or transaction dependency issues.
1407 : : */
1408 : : static void
1409 : 22 : apply_handle_commit_prepared(StringInfo s)
1410 : : {
1411 : : LogicalRepCommitPreparedTxnData prepare_data;
1412 : : char gid[GIDSIZE];
1413 : :
1414 : 22 : logicalrep_read_commit_prepared(s, &prepare_data);
1468 1415 : 22 : set_apply_error_context_xact(prepare_data.xid, prepare_data.commit_lsn);
1416 : :
1417 : : /* Compute GID for two_phase transactions. */
1705 1418 : 22 : TwoPhaseTransactionGid(MySubscription->oid, prepare_data.xid,
1419 : : gid, sizeof(gid));
1420 : :
1421 : : /* There is no transaction when COMMIT PREPARED is called */
1422 : 22 : begin_replication_step();
1423 : :
1424 : : /*
1425 : : * Update origin state so we can restart streaming from correct position
1426 : : * in case of crash.
1427 : : */
46 msawada@postgresql.o 1428 :GNC 22 : replorigin_xact_state.origin_lsn = prepare_data.end_lsn;
1429 : 22 : replorigin_xact_state.origin_timestamp = prepare_data.commit_time;
1430 : :
1705 akapila@postgresql.o 1431 :CBC 22 : FinishPreparedTransaction(gid, true);
1432 : 22 : end_replication_step();
1433 : 22 : CommitTransactionCommand();
1434 : 22 : pgstat_report_stat(false);
1435 : :
1161 1436 : 22 : store_flush_position(prepare_data.end_lsn, XactLastCommitEnd);
1705 1437 : 22 : in_remote_transaction = false;
1438 : :
1439 : : /*
1440 : : * Process any tables that are being synchronized in parallel, as well as
1441 : : * any newly added tables or sequences.
1442 : : */
150 akapila@postgresql.o 1443 :GNC 22 : ProcessSyncingRelations(prepare_data.end_lsn);
1444 : :
1454 akapila@postgresql.o 1445 :CBC 22 : clear_subscription_skip_lsn(prepare_data.end_lsn);
1446 : :
1705 1447 : 22 : pgstat_report_activity(STATE_IDLE, NULL);
1661 1448 : 22 : reset_apply_error_context_info();
1705 1449 : 22 : }
1450 : :
1451 : : /*
1452 : : * Handle a ROLLBACK PREPARED of a previously PREPARED TRANSACTION.
1453 : : *
1454 : : * Note that we don't need to wait here if the transaction was prepared in a
1455 : : * parallel apply worker. In that case, we have already waited for the prepare
1456 : : * to finish in apply_handle_stream_prepare() which will ensure all the
1457 : : * operations in that transaction have happened in the subscriber, so no
1458 : : * concurrent transaction can cause deadlock or transaction dependency issues.
1459 : : */
1460 : : static void
1461 : 5 : apply_handle_rollback_prepared(StringInfo s)
1462 : : {
1463 : : LogicalRepRollbackPreparedTxnData rollback_data;
1464 : : char gid[GIDSIZE];
1465 : :
1466 : 5 : logicalrep_read_rollback_prepared(s, &rollback_data);
1468 1467 : 5 : set_apply_error_context_xact(rollback_data.xid, rollback_data.rollback_end_lsn);
1468 : :
1469 : : /* Compute GID for two_phase transactions. */
1705 1470 : 5 : TwoPhaseTransactionGid(MySubscription->oid, rollback_data.xid,
1471 : : gid, sizeof(gid));
1472 : :
1473 : : /*
1474 : : * It is possible that we haven't received prepare because it occurred
1475 : : * before walsender reached a consistent point or the two_phase was still
1476 : : * not enabled by that time, so in such cases, we need to skip rollback
1477 : : * prepared.
1478 : : */
1479 [ + - ]: 5 : if (LookupGXact(gid, rollback_data.prepare_end_lsn,
1480 : : rollback_data.prepare_time))
1481 : : {
1482 : : /*
1483 : : * Update origin state so we can restart streaming from correct
1484 : : * position in case of crash.
1485 : : */
46 msawada@postgresql.o 1486 :GNC 5 : replorigin_xact_state.origin_lsn = rollback_data.rollback_end_lsn;
1487 : 5 : replorigin_xact_state.origin_timestamp = rollback_data.rollback_time;
1488 : :
1489 : : /* There is no transaction when ABORT/ROLLBACK PREPARED is called */
1705 akapila@postgresql.o 1490 :CBC 5 : begin_replication_step();
1491 : 5 : FinishPreparedTransaction(gid, false);
1492 : 5 : end_replication_step();
1493 : 5 : CommitTransactionCommand();
1494 : :
1454 1495 : 5 : clear_subscription_skip_lsn(rollback_data.rollback_end_lsn);
1496 : : }
1497 : :
1705 1498 : 5 : pgstat_report_stat(false);
1499 : :
1500 : : /*
1501 : : * It is okay not to set the local_end LSN for the rollback of prepared
1502 : : * transaction because we always flush the WAL record for it. See
1503 : : * apply_handle_prepare.
1504 : : */
583 1505 : 5 : store_flush_position(rollback_data.rollback_end_lsn, InvalidXLogRecPtr);
1705 1506 : 5 : in_remote_transaction = false;
1507 : :
1508 : : /*
1509 : : * Process any tables that are being synchronized in parallel, as well as
1510 : : * any newly added tables or sequences.
1511 : : */
150 akapila@postgresql.o 1512 :GNC 5 : ProcessSyncingRelations(rollback_data.rollback_end_lsn);
1513 : :
1705 akapila@postgresql.o 1514 :CBC 5 : pgstat_report_activity(STATE_IDLE, NULL);
1661 1515 : 5 : reset_apply_error_context_info();
1705 1516 : 5 : }
1517 : :
1518 : : /*
1519 : : * Handle STREAM PREPARE.
1520 : : */
1521 : : static void
1684 1522 : 15 : apply_handle_stream_prepare(StringInfo s)
1523 : : {
1524 : : LogicalRepPreparedTxnData prepare_data;
1525 : : ParallelApplyWorkerInfo *winfo;
1526 : : TransApplyAction apply_action;
1527 : :
1528 : : /* Save the message before it is consumed. */
1161 1529 : 15 : StringInfoData original_msg = *s;
1530 : :
1684 1531 [ - + ]: 15 : if (in_streamed_transaction)
1684 akapila@postgresql.o 1532 [ # # ]:UBC 0 : ereport(ERROR,
1533 : : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1534 : : errmsg_internal("STREAM PREPARE message without STREAM STOP")));
1535 : :
1536 : : /* Tablesync should never receive prepare. */
1684 akapila@postgresql.o 1537 [ - + ]:CBC 15 : if (am_tablesync_worker())
1684 akapila@postgresql.o 1538 [ # # ]:UBC 0 : ereport(ERROR,
1539 : : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1540 : : errmsg_internal("tablesync worker received a STREAM PREPARE message")));
1541 : :
1684 akapila@postgresql.o 1542 :CBC 15 : logicalrep_read_stream_prepare(s, &prepare_data);
1468 1543 : 15 : set_apply_error_context_xact(prepare_data.xid, prepare_data.prepare_lsn);
1544 : :
1161 1545 : 15 : apply_action = get_transaction_apply_action(prepare_data.xid, &winfo);
1546 : :
1547 [ + + + + : 15 : switch (apply_action)
- ]
1548 : : {
1153 1549 : 5 : case TRANS_LEADER_APPLY:
1550 : :
1551 : : /*
1552 : : * The transaction has been serialized to file, so replay all the
1553 : : * spooled operations.
1554 : : */
1161 1555 : 5 : apply_spooled_messages(MyLogicalRepWorker->stream_fileset,
1556 : : prepare_data.xid, prepare_data.prepare_lsn);
1557 : :
1558 : : /* Mark the transaction as prepared. */
1559 : 5 : apply_handle_prepare_internal(&prepare_data);
1560 : :
1561 : 5 : CommitTransactionCommand();
1562 : :
1563 : : /*
1564 : : * It is okay not to set the local_end LSN for the prepare because
1565 : : * we always flush the prepare record. See apply_handle_prepare.
1566 : : */
583 1567 : 5 : store_flush_position(prepare_data.end_lsn, InvalidXLogRecPtr);
1568 : :
1161 1569 : 5 : in_remote_transaction = false;
1570 : :
1571 : : /* Unlink the files with serialized changes and subxact info. */
1572 : 5 : stream_cleanup_files(MyLogicalRepWorker->subid, prepare_data.xid);
1573 : :
1574 [ - + ]: 5 : elog(DEBUG1, "finished processing the STREAM PREPARE command");
1575 : 5 : break;
1576 : :
1577 : 4 : case TRANS_LEADER_SEND_TO_PARALLEL:
1578 [ - + ]: 4 : Assert(winfo);
1579 : :
1580 [ + - ]: 4 : if (pa_send_data(winfo, s->len, s->data))
1581 : : {
1582 : : /* Finish processing the streaming transaction. */
1583 : 4 : pa_xact_finish(winfo, prepare_data.end_lsn);
1584 : 3 : break;
1585 : : }
1586 : :
1587 : : /*
1588 : : * Switch to serialize mode when we are not able to send the
1589 : : * change to parallel apply worker.
1590 : : */
1161 akapila@postgresql.o 1591 :UBC 0 : pa_switch_to_partial_serialize(winfo, true);
1592 : :
1593 : : pg_fallthrough;
1161 akapila@postgresql.o 1594 :CBC 1 : case TRANS_LEADER_PARTIAL_SERIALIZE:
1595 [ - + ]: 1 : Assert(winfo);
1596 : :
1597 : 1 : stream_open_and_write_change(prepare_data.xid,
1598 : : LOGICAL_REP_MSG_STREAM_PREPARE,
1599 : : &original_msg);
1600 : :
1601 : 1 : pa_set_fileset_state(winfo->shared, FS_SERIALIZE_DONE);
1602 : :
1603 : : /* Finish processing the streaming transaction. */
1604 : 1 : pa_xact_finish(winfo, prepare_data.end_lsn);
1605 : 1 : break;
1606 : :
1607 : 5 : case TRANS_PARALLEL_APPLY:
1608 : :
1609 : : /*
1610 : : * If the parallel apply worker is applying spooled messages then
1611 : : * close the file before preparing.
1612 : : */
1613 [ + + ]: 5 : if (stream_fd)
1614 : 1 : stream_close_file();
1615 : :
1616 : 5 : begin_replication_step();
1617 : :
1618 : : /* Mark the transaction as prepared. */
1619 : 5 : apply_handle_prepare_internal(&prepare_data);
1620 : :
1621 : 5 : end_replication_step();
1622 : :
1623 : 5 : CommitTransactionCommand();
1624 : :
1625 : : /*
1626 : : * It is okay not to set the local_end LSN for the prepare because
1627 : : * we always flush the prepare record. See apply_handle_prepare.
1628 : : */
583 1629 : 4 : MyParallelShared->last_commit_end = InvalidXLogRecPtr;
1630 : :
1161 1631 : 4 : pa_set_xact_state(MyParallelShared, PARALLEL_TRANS_FINISHED);
1632 : 4 : pa_unlock_transaction(MyParallelShared->xid, AccessExclusiveLock);
1633 : :
1634 : 4 : pa_reset_subtrans();
1635 : :
1636 [ + + ]: 4 : elog(DEBUG1, "finished processing the STREAM PREPARE command");
1637 : 4 : break;
1638 : :
1161 akapila@postgresql.o 1639 :UBC 0 : default:
1153 1640 [ # # ]: 0 : elog(ERROR, "unexpected apply action: %d", (int) apply_action);
1641 : : break;
1642 : : }
1643 : :
1161 akapila@postgresql.o 1644 :CBC 13 : pgstat_report_stat(false);
1645 : :
1646 : : /*
1647 : : * Process any tables that are being synchronized in parallel, as well as
1648 : : * any newly added tables or sequences.
1649 : : */
150 akapila@postgresql.o 1650 :GNC 13 : ProcessSyncingRelations(prepare_data.end_lsn);
1651 : :
1652 : : /*
1653 : : * Similar to prepare case, the subskiplsn could be left in a case of
1654 : : * server crash but it's okay. See the comments in apply_handle_prepare().
1655 : : */
1454 akapila@postgresql.o 1656 :CBC 13 : stop_skipping_changes();
1657 : 13 : clear_subscription_skip_lsn(prepare_data.prepare_lsn);
1658 : :
1684 1659 : 13 : pgstat_report_activity(STATE_IDLE, NULL);
1660 : :
1661 1661 : 13 : reset_apply_error_context_info();
1684 1662 : 13 : }
1663 : :
1664 : : /*
1665 : : * Handle ORIGIN message.
1666 : : *
1667 : : * TODO, support tracking of multiple origins
1668 : : */
1669 : : static void
3342 peter_e@gmx.net 1670 : 8 : apply_handle_origin(StringInfo s)
1671 : : {
1672 : : /*
1673 : : * ORIGIN message can only come inside streaming transaction or inside
1674 : : * remote transaction and before any actual writes.
1675 : : */
2019 akapila@postgresql.o 1676 [ + + ]: 8 : if (!in_streamed_transaction &&
1677 [ + - - + ]: 12 : (!in_remote_transaction ||
1678 [ - - ]: 6 : (IsTransactionState() && !am_tablesync_worker())))
3342 peter_e@gmx.net 1679 [ # # ]:UBC 0 : ereport(ERROR,
1680 : : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1681 : : errmsg_internal("ORIGIN message sent out of order")));
3342 peter_e@gmx.net 1682 :CBC 8 : }
1683 : :
1684 : : /*
1685 : : * Initialize fileset (if not already done).
1686 : : *
1687 : : * Create a new file when first_segment is true, otherwise open the existing
1688 : : * file.
1689 : : */
1690 : : void
1161 akapila@postgresql.o 1691 : 363 : stream_start_internal(TransactionId xid, bool first_segment)
1692 : : {
1693 : 363 : begin_replication_step();
1694 : :
1695 : : /*
1696 : : * Initialize the worker's stream_fileset if we haven't yet. This will be
1697 : : * used for the entire duration of the worker so create it in a permanent
1698 : : * context. We create this on the very first streaming message from any
1699 : : * transaction and then use it for this and other streaming transactions.
1700 : : * Now, we could create a fileset at the start of the worker as well but
1701 : : * then we won't be sure that it will ever be used.
1702 : : */
1703 [ + + ]: 363 : if (!MyLogicalRepWorker->stream_fileset)
1704 : : {
1705 : : MemoryContext oldctx;
1706 : :
1707 : 14 : oldctx = MemoryContextSwitchTo(ApplyContext);
1708 : :
95 michael@paquier.xyz 1709 :GNC 14 : MyLogicalRepWorker->stream_fileset = palloc_object(FileSet);
1161 akapila@postgresql.o 1710 :CBC 14 : FileSetInit(MyLogicalRepWorker->stream_fileset);
1711 : :
1712 : 14 : MemoryContextSwitchTo(oldctx);
1713 : : }
1714 : :
1715 : : /* Open the spool file for this transaction. */
1716 : 363 : stream_open_file(MyLogicalRepWorker->subid, xid, first_segment);
1717 : :
1718 : : /* If this is not the first segment, open existing subxact file. */
1719 [ + + ]: 363 : if (!first_segment)
1720 : 331 : subxact_info_read(MyLogicalRepWorker->subid, xid);
1721 : :
1722 : 363 : end_replication_step();
1723 : 363 : }
1724 : :
1725 : : /*
1726 : : * Handle STREAM START message.
1727 : : */
1728 : : static void
2019 1729 : 843 : apply_handle_stream_start(StringInfo s)
1730 : : {
1731 : : bool first_segment;
1732 : : ParallelApplyWorkerInfo *winfo;
1733 : : TransApplyAction apply_action;
1734 : :
1735 : : /* Save the message before it is consumed. */
1161 1736 : 843 : StringInfoData original_msg = *s;
1737 : :
1737 tgl@sss.pgh.pa.us 1738 [ - + ]: 843 : if (in_streamed_transaction)
1737 tgl@sss.pgh.pa.us 1739 [ # # ]:UBC 0 : ereport(ERROR,
1740 : : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1741 : : errmsg_internal("duplicate STREAM START message")));
1742 : :
1743 : : /* There must not be an active streaming transaction. */
1153 akapila@postgresql.o 1744 [ - + ]:CBC 843 : Assert(!TransactionIdIsValid(stream_xid));
1745 : :
1746 : : /* notify handle methods we're processing a remote transaction */
2019 1747 : 843 : in_streamed_transaction = true;
1748 : :
1749 : : /* extract XID of the top-level transaction */
1750 : 843 : stream_xid = logicalrep_read_stream_start(s, &first_segment);
1751 : :
1737 tgl@sss.pgh.pa.us 1752 [ - + ]: 843 : if (!TransactionIdIsValid(stream_xid))
1737 tgl@sss.pgh.pa.us 1753 [ # # ]:UBC 0 : ereport(ERROR,
1754 : : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1755 : : errmsg_internal("invalid transaction ID in streamed replication transaction")));
1756 : :
1468 akapila@postgresql.o 1757 :CBC 843 : set_apply_error_context_xact(stream_xid, InvalidXLogRecPtr);
1758 : :
1759 : : /* Try to allocate a worker for the streaming transaction. */
1161 1760 [ + + ]: 843 : if (first_segment)
1761 : 86 : pa_allocate_worker(stream_xid);
1762 : :
1763 : 843 : apply_action = get_transaction_apply_action(stream_xid, &winfo);
1764 : :
1765 [ + + + + : 843 : switch (apply_action)
- ]
1766 : : {
1767 : 343 : case TRANS_LEADER_SERIALIZE:
1768 : :
1769 : : /*
1770 : : * Function stream_start_internal starts a transaction. This
1771 : : * transaction will be committed on the stream stop unless it is a
1772 : : * tablesync worker in which case it will be committed after
1773 : : * processing all the messages. We need this transaction for
1774 : : * handling the BufFile, used for serializing the streaming data
1775 : : * and subxact info.
1776 : : */
1777 : 343 : stream_start_internal(stream_xid, first_segment);
1778 : 343 : break;
1779 : :
1780 : 244 : case TRANS_LEADER_SEND_TO_PARALLEL:
1781 [ - + ]: 244 : Assert(winfo);
1782 : :
1783 : : /*
1784 : : * Once we start serializing the changes, the parallel apply
1785 : : * worker will wait for the leader to release the stream lock
1786 : : * until the end of the transaction. So, we don't need to release
1787 : : * the lock or increment the stream count in that case.
1788 : : */
1789 [ + + ]: 244 : if (pa_send_data(winfo, s->len, s->data))
1790 : : {
1791 : : /*
1792 : : * Unlock the shared object lock so that the parallel apply
1793 : : * worker can continue to receive changes.
1794 : : */
1795 [ + + ]: 240 : if (!first_segment)
1796 : 215 : pa_unlock_stream(winfo->shared->xid, AccessExclusiveLock);
1797 : :
1798 : : /*
1799 : : * Increment the number of streaming blocks waiting to be
1800 : : * processed by parallel apply worker.
1801 : : */
1802 : 240 : pg_atomic_add_fetch_u32(&winfo->shared->pending_stream_count, 1);
1803 : :
1804 : : /* Cache the parallel apply worker for this transaction. */
1805 : 240 : pa_set_stream_apply_worker(winfo);
1806 : 240 : break;
1807 : : }
1808 : :
1809 : : /*
1810 : : * Switch to serialize mode when we are not able to send the
1811 : : * change to parallel apply worker.
1812 : : */
1813 : 4 : pa_switch_to_partial_serialize(winfo, !first_segment);
1814 : :
1815 : : pg_fallthrough;
1816 : 15 : case TRANS_LEADER_PARTIAL_SERIALIZE:
1817 [ - + ]: 15 : Assert(winfo);
1818 : :
1819 : : /*
1820 : : * Open the spool file unless it was already opened when switching
1821 : : * to serialize mode. The transaction started in
1822 : : * stream_start_internal will be committed on the stream stop.
1823 : : */
1824 [ + + ]: 15 : if (apply_action != TRANS_LEADER_SEND_TO_PARALLEL)
1825 : 11 : stream_start_internal(stream_xid, first_segment);
1826 : :
1827 : 15 : stream_write_change(LOGICAL_REP_MSG_STREAM_START, &original_msg);
1828 : :
1829 : : /* Cache the parallel apply worker for this transaction. */
1830 : 15 : pa_set_stream_apply_worker(winfo);
1831 : 15 : break;
1832 : :
1833 : 245 : case TRANS_PARALLEL_APPLY:
1834 [ + + ]: 245 : if (first_segment)
1835 : : {
1836 : : /* Hold the lock until the end of the transaction. */
1837 : 29 : pa_lock_transaction(MyParallelShared->xid, AccessExclusiveLock);
1838 : 29 : pa_set_xact_state(MyParallelShared, PARALLEL_TRANS_STARTED);
1839 : :
1840 : : /*
1841 : : * Signal the leader apply worker, as it may be waiting for
1842 : : * us.
1843 : : */
138 akapila@postgresql.o 1844 :GNC 29 : logicalrep_worker_wakeup(WORKERTYPE_APPLY,
1845 : 29 : MyLogicalRepWorker->subid, InvalidOid);
1846 : : }
1847 : :
1161 akapila@postgresql.o 1848 :CBC 245 : parallel_stream_nchanges = 0;
1849 : 245 : break;
1850 : :
1161 akapila@postgresql.o 1851 :UBC 0 : default:
1153 1852 [ # # ]: 0 : elog(ERROR, "unexpected apply action: %d", (int) apply_action);
1853 : : break;
1854 : : }
1855 : :
1161 akapila@postgresql.o 1856 :CBC 843 : pgstat_report_activity(STATE_RUNNING, NULL);
2019 1857 : 843 : }
1858 : :
1859 : : /*
1860 : : * Update the information about subxacts and close the file.
1861 : : *
1862 : : * This function should be called when the stream_start_internal function has
1863 : : * been called.
1864 : : */
1865 : : void
1161 1866 : 363 : stream_stop_internal(TransactionId xid)
1867 : : {
1868 : : /*
1869 : : * Serialize information about subxacts for the toplevel transaction, then
1870 : : * close the stream messages spool file.
1871 : : */
1872 : 363 : subxact_info_write(MyLogicalRepWorker->subid, xid);
2019 1873 : 363 : stream_close_file();
1874 : :
1875 : : /* We must be in a valid transaction state */
1876 [ - + ]: 363 : Assert(IsTransactionState());
1877 : :
1878 : : /* Commit the per-stream transaction */
1857 1879 : 363 : CommitTransactionCommand();
1880 : :
1881 : : /* Reset per-stream context */
2019 1882 : 363 : MemoryContextReset(LogicalStreamingContext);
1883 : 363 : }
1884 : :
1885 : : /*
1886 : : * Handle STREAM STOP message.
1887 : : */
1888 : : static void
1161 1889 : 842 : apply_handle_stream_stop(StringInfo s)
1890 : : {
1891 : : ParallelApplyWorkerInfo *winfo;
1892 : : TransApplyAction apply_action;
1893 : :
1894 [ - + ]: 842 : if (!in_streamed_transaction)
1737 tgl@sss.pgh.pa.us 1895 [ # # ]:UBC 0 : ereport(ERROR,
1896 : : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1897 : : errmsg_internal("STREAM STOP message without STREAM START")));
1898 : :
1161 akapila@postgresql.o 1899 :CBC 842 : apply_action = get_transaction_apply_action(stream_xid, &winfo);
1900 : :
1901 [ + + + + : 842 : switch (apply_action)
- ]
1902 : : {
1903 : 343 : case TRANS_LEADER_SERIALIZE:
1904 : 343 : stream_stop_internal(stream_xid);
1905 : 343 : break;
1906 : :
1907 : 240 : case TRANS_LEADER_SEND_TO_PARALLEL:
1908 [ - + ]: 240 : Assert(winfo);
1909 : :
1910 : : /*
1911 : : * Lock before sending the STREAM_STOP message so that the leader
1912 : : * can hold the lock first and the parallel apply worker will wait
1913 : : * for leader to release the lock. See Locking Considerations atop
1914 : : * applyparallelworker.c.
1915 : : */
1916 : 240 : pa_lock_stream(winfo->shared->xid, AccessExclusiveLock);
1917 : :
1918 [ + - ]: 240 : if (pa_send_data(winfo, s->len, s->data))
1919 : : {
1920 : 240 : pa_set_stream_apply_worker(NULL);
1921 : 240 : break;
1922 : : }
1923 : :
1924 : : /*
1925 : : * Switch to serialize mode when we are not able to send the
1926 : : * change to parallel apply worker.
1927 : : */
1161 akapila@postgresql.o 1928 :UBC 0 : pa_switch_to_partial_serialize(winfo, true);
1929 : :
1930 : : pg_fallthrough;
1161 akapila@postgresql.o 1931 :CBC 15 : case TRANS_LEADER_PARTIAL_SERIALIZE:
1932 : 15 : stream_write_change(LOGICAL_REP_MSG_STREAM_STOP, s);
1933 : 15 : stream_stop_internal(stream_xid);
1934 : 15 : pa_set_stream_apply_worker(NULL);
1935 : 15 : break;
1936 : :
1937 : 244 : case TRANS_PARALLEL_APPLY:
1938 [ + + ]: 244 : elog(DEBUG1, "applied %u changes in the streaming chunk",
1939 : : parallel_stream_nchanges);
1940 : :
1941 : : /*
1942 : : * By the time parallel apply worker is processing the changes in
1943 : : * the current streaming block, the leader apply worker may have
1944 : : * sent multiple streaming blocks. This can lead to parallel apply
1945 : : * worker start waiting even when there are more chunk of streams
1946 : : * in the queue. So, try to lock only if there is no message left
1947 : : * in the queue. See Locking Considerations atop
1948 : : * applyparallelworker.c.
1949 : : *
1950 : : * Note that here we have a race condition where we can start
1951 : : * waiting even when there are pending streaming chunks. This can
1952 : : * happen if the leader sends another streaming block and acquires
1953 : : * the stream lock again after the parallel apply worker checks
1954 : : * that there is no pending streaming block and before it actually
1955 : : * starts waiting on a lock. We can handle this case by not
1956 : : * allowing the leader to increment the stream block count during
1957 : : * the time parallel apply worker acquires the lock but it is not
1958 : : * clear whether that is worth the complexity.
1959 : : *
1960 : : * Now, if this missed chunk contains rollback to savepoint, then
1961 : : * there is a risk of deadlock which probably shouldn't happen
1962 : : * after restart.
1963 : : */
1964 : 244 : pa_decr_and_wait_stream_block();
1965 : 242 : break;
1966 : :
1161 akapila@postgresql.o 1967 :UBC 0 : default:
1153 1968 [ # # ]: 0 : elog(ERROR, "unexpected apply action: %d", (int) apply_action);
1969 : : break;
1970 : : }
1971 : :
1161 akapila@postgresql.o 1972 :CBC 840 : in_streamed_transaction = false;
1153 1973 : 840 : stream_xid = InvalidTransactionId;
1974 : :
1975 : : /*
1976 : : * The parallel apply worker could be in a transaction in which case we
1977 : : * need to report the state as STATE_IDLEINTRANSACTION.
1978 : : */
1161 1979 [ + + ]: 840 : if (IsTransactionOrTransactionBlock())
1980 : 242 : pgstat_report_activity(STATE_IDLEINTRANSACTION, NULL);
1981 : : else
1982 : 598 : pgstat_report_activity(STATE_IDLE, NULL);
1983 : :
1984 : 840 : reset_apply_error_context_info();
1985 : 840 : }
1986 : :
1987 : : /*
1988 : : * Helper function to handle STREAM ABORT message when the transaction was
1989 : : * serialized to file.
1990 : : */
1991 : : static void
1992 : 14 : stream_abort_internal(TransactionId xid, TransactionId subxid)
1993 : : {
1994 : : /*
1995 : : * If the two XIDs are the same, it's in fact abort of toplevel xact, so
1996 : : * just delete the files with serialized info.
1997 : : */
2019 1998 [ + + ]: 14 : if (xid == subxid)
1999 : 1 : stream_cleanup_files(MyLogicalRepWorker->subid, xid);
2000 : : else
2001 : : {
2002 : : /*
2003 : : * OK, so it's a subxact. We need to read the subxact file for the
2004 : : * toplevel transaction, determine the offset tracked for the subxact,
2005 : : * and truncate the file with changes. We also remove the subxacts
2006 : : * with higher offsets (or rather higher XIDs).
2007 : : *
2008 : : * We intentionally scan the array from the tail, because we're likely
2009 : : * aborting a change for the most recent subtransactions.
2010 : : *
2011 : : * We can't use the binary search here as subxact XIDs won't
2012 : : * necessarily arrive in sorted order, consider the case where we have
2013 : : * released the savepoint for multiple subtransactions and then
2014 : : * performed rollback to savepoint for one of the earlier
2015 : : * sub-transaction.
2016 : : */
2017 : : int64 i;
2018 : : int64 subidx;
2019 : : BufFile *fd;
2020 : 13 : bool found = false;
2021 : : char path[MAXPGPATH];
2022 : :
2023 : 13 : subidx = -1;
1739 tgl@sss.pgh.pa.us 2024 : 13 : begin_replication_step();
2019 akapila@postgresql.o 2025 : 13 : subxact_info_read(MyLogicalRepWorker->subid, xid);
2026 : :
2027 [ + + ]: 15 : for (i = subxact_data.nsubxacts; i > 0; i--)
2028 : : {
2029 [ + + ]: 11 : if (subxact_data.subxacts[i - 1].xid == subxid)
2030 : : {
2031 : 9 : subidx = (i - 1);
2032 : 9 : found = true;
2033 : 9 : break;
2034 : : }
2035 : : }
2036 : :
2037 : : /*
2038 : : * If it's an empty sub-transaction then we will not find the subxid
2039 : : * here so just cleanup the subxact info and return.
2040 : : */
2041 [ + + ]: 13 : if (!found)
2042 : : {
2043 : : /* Cleanup the subxact info */
2044 : 4 : cleanup_subxact_info();
1739 tgl@sss.pgh.pa.us 2045 : 4 : end_replication_step();
1857 akapila@postgresql.o 2046 : 4 : CommitTransactionCommand();
2019 2047 : 4 : return;
2048 : : }
2049 : :
2050 : : /* open the changes file */
1161 2051 : 9 : changes_filename(path, MyLogicalRepWorker->subid, xid);
2052 : 9 : fd = BufFileOpenFileSet(MyLogicalRepWorker->stream_fileset, path,
2053 : : O_RDWR, false);
2054 : :
2055 : : /* OK, truncate the file at the right offset */
2056 : 9 : BufFileTruncateFileSet(fd, subxact_data.subxacts[subidx].fileno,
2057 : 9 : subxact_data.subxacts[subidx].offset);
2058 : 9 : BufFileClose(fd);
2059 : :
2060 : : /* discard the subxacts added later */
2061 : 9 : subxact_data.nsubxacts = subidx;
2062 : :
2063 : : /* write the updated subxact list */
2064 : 9 : subxact_info_write(MyLogicalRepWorker->subid, xid);
2065 : :
2066 : 9 : end_replication_step();
2067 : 9 : CommitTransactionCommand();
2068 : : }
2069 : : }
2070 : :
2071 : : /*
2072 : : * Handle STREAM ABORT message.
2073 : : */
2074 : : static void
2075 : 38 : apply_handle_stream_abort(StringInfo s)
2076 : : {
2077 : : TransactionId xid;
2078 : : TransactionId subxid;
2079 : : LogicalRepStreamAbortData abort_data;
2080 : : ParallelApplyWorkerInfo *winfo;
2081 : : TransApplyAction apply_action;
2082 : :
2083 : : /* Save the message before it is consumed. */
2084 : 38 : StringInfoData original_msg = *s;
2085 : : bool toplevel_xact;
2086 : :
2087 [ - + ]: 38 : if (in_streamed_transaction)
1161 akapila@postgresql.o 2088 [ # # ]:UBC 0 : ereport(ERROR,
2089 : : (errcode(ERRCODE_PROTOCOL_VIOLATION),
2090 : : errmsg_internal("STREAM ABORT message without STREAM STOP")));
2091 : :
2092 : : /* We receive abort information only when we can apply in parallel. */
1161 akapila@postgresql.o 2093 :CBC 38 : logicalrep_read_stream_abort(s, &abort_data,
2094 : 38 : MyLogicalRepWorker->parallel_apply);
2095 : :
2096 : 38 : xid = abort_data.xid;
2097 : 38 : subxid = abort_data.subxid;
2098 : 38 : toplevel_xact = (xid == subxid);
2099 : :
2100 : 38 : set_apply_error_context_xact(subxid, abort_data.abort_lsn);
2101 : :
2102 : 38 : apply_action = get_transaction_apply_action(xid, &winfo);
2103 : :
2104 [ + + + + : 38 : switch (apply_action)
- ]
2105 : : {
1153 2106 : 14 : case TRANS_LEADER_APPLY:
2107 : :
2108 : : /*
2109 : : * We are in the leader apply worker and the transaction has been
2110 : : * serialized to file.
2111 : : */
1161 2112 : 14 : stream_abort_internal(xid, subxid);
2113 : :
2114 [ - + ]: 14 : elog(DEBUG1, "finished processing the STREAM ABORT command");
2115 : 14 : break;
2116 : :
2117 : 10 : case TRANS_LEADER_SEND_TO_PARALLEL:
2118 [ - + ]: 10 : Assert(winfo);
2119 : :
2120 : : /*
2121 : : * For the case of aborting the subtransaction, we increment the
2122 : : * number of streaming blocks and take the lock again before
2123 : : * sending the STREAM_ABORT to ensure that the parallel apply
2124 : : * worker will wait on the lock for the next set of changes after
2125 : : * processing the STREAM_ABORT message if it is not already
2126 : : * waiting for STREAM_STOP message.
2127 : : *
2128 : : * It is important to perform this locking before sending the
2129 : : * STREAM_ABORT message so that the leader can hold the lock first
2130 : : * and the parallel apply worker will wait for the leader to
2131 : : * release the lock. This is the same as what we do in
2132 : : * apply_handle_stream_stop. See Locking Considerations atop
2133 : : * applyparallelworker.c.
2134 : : */
2135 [ + + ]: 10 : if (!toplevel_xact)
2136 : : {
2137 : 9 : pa_unlock_stream(xid, AccessExclusiveLock);
2138 : 9 : pg_atomic_add_fetch_u32(&winfo->shared->pending_stream_count, 1);
2139 : 9 : pa_lock_stream(xid, AccessExclusiveLock);
2140 : : }
2141 : :
2142 [ + - ]: 10 : if (pa_send_data(winfo, s->len, s->data))
2143 : : {
2144 : : /*
2145 : : * Unlike STREAM_COMMIT and STREAM_PREPARE, we don't need to
2146 : : * wait here for the parallel apply worker to finish as that
2147 : : * is not required to maintain the commit order and won't have
2148 : : * the risk of failures due to transaction dependencies and
2149 : : * deadlocks. However, it is possible that before the parallel
2150 : : * worker finishes and we clear the worker info, the xid
2151 : : * wraparound happens on the upstream and a new transaction
2152 : : * with the same xid can appear and that can lead to duplicate
2153 : : * entries in ParallelApplyTxnHash. Yet another problem could
2154 : : * be that we may have serialized the changes in partial
2155 : : * serialize mode and the file containing xact changes may
2156 : : * already exist, and after xid wraparound trying to create
2157 : : * the file for the same xid can lead to an error. To avoid
2158 : : * these problems, we decide to wait for the aborts to finish.
2159 : : *
2160 : : * Note, it is okay to not update the flush location position
2161 : : * for aborts as in worst case that means such a transaction
2162 : : * won't be sent again after restart.
2163 : : */
2164 [ + + ]: 10 : if (toplevel_xact)
2165 : 1 : pa_xact_finish(winfo, InvalidXLogRecPtr);
2166 : :
2167 : 10 : break;
2168 : : }
2169 : :
2170 : : /*
2171 : : * Switch to serialize mode when we are not able to send the
2172 : : * change to parallel apply worker.
2173 : : */
1161 akapila@postgresql.o 2174 :UBC 0 : pa_switch_to_partial_serialize(winfo, true);
2175 : :
2176 : : pg_fallthrough;
1161 akapila@postgresql.o 2177 :CBC 2 : case TRANS_LEADER_PARTIAL_SERIALIZE:
2178 [ - + ]: 2 : Assert(winfo);
2179 : :
2180 : : /*
2181 : : * Parallel apply worker might have applied some changes, so write
2182 : : * the STREAM_ABORT message so that it can rollback the
2183 : : * subtransaction if needed.
2184 : : */
2185 : 2 : stream_open_and_write_change(xid, LOGICAL_REP_MSG_STREAM_ABORT,
2186 : : &original_msg);
2187 : :
2188 [ + + ]: 2 : if (toplevel_xact)
2189 : : {
2190 : 1 : pa_set_fileset_state(winfo->shared, FS_SERIALIZE_DONE);
2191 : 1 : pa_xact_finish(winfo, InvalidXLogRecPtr);
2192 : : }
2193 : 2 : break;
2194 : :
2195 : 12 : case TRANS_PARALLEL_APPLY:
2196 : :
2197 : : /*
2198 : : * If the parallel apply worker is applying spooled messages then
2199 : : * close the file before aborting.
2200 : : */
2201 [ + + + + ]: 12 : if (toplevel_xact && stream_fd)
2202 : 1 : stream_close_file();
2203 : :
2204 : 12 : pa_stream_abort(&abort_data);
2205 : :
2206 : : /*
2207 : : * We need to wait after processing rollback to savepoint for the
2208 : : * next set of changes.
2209 : : *
2210 : : * We have a race condition here due to which we can start waiting
2211 : : * here when there are more chunk of streams in the queue. See
2212 : : * apply_handle_stream_stop.
2213 : : */
2214 [ + + ]: 12 : if (!toplevel_xact)
2215 : 10 : pa_decr_and_wait_stream_block();
2216 : :
2217 [ + + ]: 12 : elog(DEBUG1, "finished processing the STREAM ABORT command");
2218 : 12 : break;
2219 : :
1161 akapila@postgresql.o 2220 :UBC 0 : default:
1153 2221 [ # # ]: 0 : elog(ERROR, "unexpected apply action: %d", (int) apply_action);
2222 : : break;
2223 : : }
2224 : :
1161 akapila@postgresql.o 2225 :CBC 38 : reset_apply_error_context_info();
2226 : 38 : }
2227 : :
2228 : : /*
2229 : : * Ensure that the passed location is fileset's end.
2230 : : */
2231 : : static void
2232 : 4 : ensure_last_message(FileSet *stream_fileset, TransactionId xid, int fileno,
2233 : : pgoff_t offset)
2234 : : {
2235 : : char path[MAXPGPATH];
2236 : : BufFile *fd;
2237 : : int last_fileno;
2238 : : pgoff_t last_offset;
2239 : :
2240 [ - + ]: 4 : Assert(!IsTransactionState());
2241 : :
2242 : 4 : begin_replication_step();
2243 : :
2244 : 4 : changes_filename(path, MyLogicalRepWorker->subid, xid);
2245 : :
2246 : 4 : fd = BufFileOpenFileSet(stream_fileset, path, O_RDONLY, false);
2247 : :
2248 : 4 : BufFileSeek(fd, 0, 0, SEEK_END);
2249 : 4 : BufFileTell(fd, &last_fileno, &last_offset);
2250 : :
2251 : 4 : BufFileClose(fd);
2252 : :
2253 : 4 : end_replication_step();
2254 : :
2255 [ + - - + ]: 4 : if (last_fileno != fileno || last_offset != offset)
1161 akapila@postgresql.o 2256 [ # # ]:UBC 0 : elog(ERROR, "unexpected message left in streaming transaction's changes file \"%s\"",
2257 : : path);
2019 akapila@postgresql.o 2258 :CBC 4 : }
2259 : :
2260 : : /*
2261 : : * Common spoolfile processing.
2262 : : */
2263 : : void
1161 2264 : 31 : apply_spooled_messages(FileSet *stream_fileset, TransactionId xid,
2265 : : XLogRecPtr lsn)
2266 : : {
2267 : : int nchanges;
2268 : : char path[MAXPGPATH];
2019 2269 : 31 : char *buffer = NULL;
2270 : : MemoryContext oldcxt;
2271 : : ResourceOwner oldowner;
2272 : : int fileno;
2273 : : pgoff_t offset;
2274 : :
1161 2275 [ + + ]: 31 : if (!am_parallel_apply_worker())
2276 : 27 : maybe_start_skipping_changes(lsn);
2277 : :
2278 : : /* Make sure we have an open transaction */
1739 tgl@sss.pgh.pa.us 2279 : 31 : begin_replication_step();
2280 : :
2281 : : /*
2282 : : * Allocate file handle and memory required to process all the messages in
2283 : : * TopTransactionContext to avoid them getting reset after each message is
2284 : : * processed.
2285 : : */
2019 akapila@postgresql.o 2286 : 31 : oldcxt = MemoryContextSwitchTo(TopTransactionContext);
2287 : :
2288 : : /* Open the spool file for the committed/prepared transaction */
2289 : 31 : changes_filename(path, MyLogicalRepWorker->subid, xid);
2290 [ - + ]: 31 : elog(DEBUG1, "replaying changes from file \"%s\"", path);
2291 : :
2292 : : /*
2293 : : * Make sure the file is owned by the toplevel transaction so that the
2294 : : * file will not be accidentally closed when aborting a subtransaction.
2295 : : */
1161 2296 : 31 : oldowner = CurrentResourceOwner;
2297 : 31 : CurrentResourceOwner = TopTransactionResourceOwner;
2298 : :
2299 : 31 : stream_fd = BufFileOpenFileSet(stream_fileset, path, O_RDONLY, false);
2300 : :
2301 : 31 : CurrentResourceOwner = oldowner;
2302 : :
2019 2303 : 31 : buffer = palloc(BLCKSZ);
2304 : :
2305 : 31 : MemoryContextSwitchTo(oldcxt);
2306 : :
1690 2307 : 31 : remote_final_lsn = lsn;
2308 : :
2309 : : /*
2310 : : * Make sure the handle apply_dispatch methods are aware we're in a remote
2311 : : * transaction.
2312 : : */
2019 2313 : 31 : in_remote_transaction = true;
2314 : 31 : pgstat_report_activity(STATE_RUNNING, NULL);
2315 : :
1739 tgl@sss.pgh.pa.us 2316 : 31 : end_replication_step();
2317 : :
2318 : : /*
2319 : : * Read the entries one by one and pass them through the same logic as in
2320 : : * apply_dispatch.
2321 : : */
2019 akapila@postgresql.o 2322 : 31 : nchanges = 0;
2323 : : while (true)
2324 : 88470 : {
2325 : : StringInfoData s2;
2326 : : size_t nbytes;
2327 : : int len;
2328 : :
2329 [ - + ]: 88501 : CHECK_FOR_INTERRUPTS();
2330 : :
2331 : : /* read length of the on-disk record */
1154 peter@eisentraut.org 2332 : 88501 : nbytes = BufFileReadMaybeEOF(stream_fd, &len, sizeof(len), true);
2333 : :
2334 : : /* have we reached end of the file? */
2019 akapila@postgresql.o 2335 [ + + ]: 88501 : if (nbytes == 0)
2336 : 26 : break;
2337 : :
2338 : : /* do we have a correct length? */
1737 tgl@sss.pgh.pa.us 2339 [ - + ]: 88475 : if (len <= 0)
1737 tgl@sss.pgh.pa.us 2340 [ # # ]:UBC 0 : elog(ERROR, "incorrect length %d in streaming transaction's changes file \"%s\"",
2341 : : len, path);
2342 : :
2343 : : /* make sure we have sufficiently large buffer */
2019 akapila@postgresql.o 2344 :CBC 88475 : buffer = repalloc(buffer, len);
2345 : :
2346 : : /* and finally read the data into the buffer */
1154 peter@eisentraut.org 2347 : 88475 : BufFileReadExact(stream_fd, buffer, len);
2348 : :
1161 akapila@postgresql.o 2349 : 88475 : BufFileTell(stream_fd, &fileno, &offset);
2350 : :
2351 : : /* init a stringinfo using the buffer and call apply_dispatch */
859 drowley@postgresql.o 2352 : 88475 : initReadOnlyStringInfo(&s2, buffer, len);
2353 : :
2354 : : /* Ensure we are reading the data into our memory context. */
2019 akapila@postgresql.o 2355 : 88475 : oldcxt = MemoryContextSwitchTo(ApplyMessageContext);
2356 : :
2357 : 88475 : apply_dispatch(&s2);
2358 : :
2359 : 88474 : MemoryContextReset(ApplyMessageContext);
2360 : :
2361 : 88474 : MemoryContextSwitchTo(oldcxt);
2362 : :
2363 : 88474 : nchanges++;
2364 : :
2365 : : /*
2366 : : * It is possible the file has been closed because we have processed
2367 : : * the transaction end message like stream_commit in which case that
2368 : : * must be the last message.
2369 : : */
1161 2370 [ + + ]: 88474 : if (!stream_fd)
2371 : : {
2372 : 4 : ensure_last_message(stream_fileset, xid, fileno, offset);
2373 : 4 : break;
2374 : : }
2375 : :
2019 2376 [ + + ]: 88470 : if (nchanges % 1000 == 0)
1737 tgl@sss.pgh.pa.us 2377 [ - + ]: 83 : elog(DEBUG1, "replayed %d changes from file \"%s\"",
2378 : : nchanges, path);
2379 : : }
2380 : :
1161 akapila@postgresql.o 2381 [ + + ]: 30 : if (stream_fd)
2382 : 26 : stream_close_file();
2383 : :
2019 2384 [ - + ]: 30 : elog(DEBUG1, "replayed %d (all) changes from file \"%s\"",
2385 : : nchanges, path);
2386 : :
1690 2387 : 30 : return;
2388 : : }
2389 : :
2390 : : /*
2391 : : * Handle STREAM COMMIT message.
2392 : : */
2393 : : static void
2394 : 61 : apply_handle_stream_commit(StringInfo s)
2395 : : {
2396 : : TransactionId xid;
2397 : : LogicalRepCommitData commit_data;
2398 : : ParallelApplyWorkerInfo *winfo;
2399 : : TransApplyAction apply_action;
2400 : :
2401 : : /* Save the message before it is consumed. */
1161 2402 : 61 : StringInfoData original_msg = *s;
2403 : :
1690 2404 [ - + ]: 61 : if (in_streamed_transaction)
1690 akapila@postgresql.o 2405 [ # # ]:UBC 0 : ereport(ERROR,
2406 : : (errcode(ERRCODE_PROTOCOL_VIOLATION),
2407 : : errmsg_internal("STREAM COMMIT message without STREAM STOP")));
2408 : :
1690 akapila@postgresql.o 2409 :CBC 61 : xid = logicalrep_read_stream_commit(s, &commit_data);
1468 2410 : 61 : set_apply_error_context_xact(xid, commit_data.commit_lsn);
2411 : :
1161 2412 : 61 : apply_action = get_transaction_apply_action(xid, &winfo);
2413 : :
2414 [ + + + + : 61 : switch (apply_action)
- ]
2415 : : {
1153 2416 : 22 : case TRANS_LEADER_APPLY:
2417 : :
2418 : : /*
2419 : : * The transaction has been serialized to file, so replay all the
2420 : : * spooled operations.
2421 : : */
1161 2422 : 22 : apply_spooled_messages(MyLogicalRepWorker->stream_fileset, xid,
2423 : : commit_data.commit_lsn);
2424 : :
2425 : 21 : apply_handle_commit_internal(&commit_data);
2426 : :
2427 : : /* Unlink the files with serialized changes and subxact info. */
2428 : 21 : stream_cleanup_files(MyLogicalRepWorker->subid, xid);
2429 : :
2430 [ - + ]: 21 : elog(DEBUG1, "finished processing the STREAM COMMIT command");
2431 : 21 : break;
2432 : :
2433 : 18 : case TRANS_LEADER_SEND_TO_PARALLEL:
2434 [ - + ]: 18 : Assert(winfo);
2435 : :
2436 [ + - ]: 18 : if (pa_send_data(winfo, s->len, s->data))
2437 : : {
2438 : : /* Finish processing the streaming transaction. */
2439 : 18 : pa_xact_finish(winfo, commit_data.end_lsn);
2440 : 17 : break;
2441 : : }
2442 : :
2443 : : /*
2444 : : * Switch to serialize mode when we are not able to send the
2445 : : * change to parallel apply worker.
2446 : : */
1161 akapila@postgresql.o 2447 :UBC 0 : pa_switch_to_partial_serialize(winfo, true);
2448 : :
2449 : : pg_fallthrough;
1161 akapila@postgresql.o 2450 :CBC 2 : case TRANS_LEADER_PARTIAL_SERIALIZE:
2451 [ - + ]: 2 : Assert(winfo);
2452 : :
2453 : 2 : stream_open_and_write_change(xid, LOGICAL_REP_MSG_STREAM_COMMIT,
2454 : : &original_msg);
2455 : :
2456 : 2 : pa_set_fileset_state(winfo->shared, FS_SERIALIZE_DONE);
2457 : :
2458 : : /* Finish processing the streaming transaction. */
2459 : 2 : pa_xact_finish(winfo, commit_data.end_lsn);
2460 : 2 : break;
2461 : :
2462 : 19 : case TRANS_PARALLEL_APPLY:
2463 : :
2464 : : /*
2465 : : * If the parallel apply worker is applying spooled messages then
2466 : : * close the file before committing.
2467 : : */
2468 [ + + ]: 19 : if (stream_fd)
2469 : 2 : stream_close_file();
2470 : :
2471 : 19 : apply_handle_commit_internal(&commit_data);
2472 : :
2473 : 19 : MyParallelShared->last_commit_end = XactLastCommitEnd;
2474 : :
2475 : : /*
2476 : : * It is important to set the transaction state as finished before
2477 : : * releasing the lock. See pa_wait_for_xact_finish.
2478 : : */
2479 : 19 : pa_set_xact_state(MyParallelShared, PARALLEL_TRANS_FINISHED);
2480 : 19 : pa_unlock_transaction(xid, AccessExclusiveLock);
2481 : :
2482 : 19 : pa_reset_subtrans();
2483 : :
2484 [ + + ]: 19 : elog(DEBUG1, "finished processing the STREAM COMMIT command");
2485 : 19 : break;
2486 : :
1161 akapila@postgresql.o 2487 :UBC 0 : default:
1153 2488 [ # # ]: 0 : elog(ERROR, "unexpected apply action: %d", (int) apply_action);
2489 : : break;
2490 : : }
2491 : :
2492 : : /*
2493 : : * Process any tables that are being synchronized in parallel, as well as
2494 : : * any newly added tables or sequences.
2495 : : */
150 akapila@postgresql.o 2496 :GNC 59 : ProcessSyncingRelations(commit_data.end_lsn);
2497 : :
2019 akapila@postgresql.o 2498 :CBC 59 : pgstat_report_activity(STATE_IDLE, NULL);
2499 : :
1661 2500 : 59 : reset_apply_error_context_info();
2019 2501 : 59 : }
2502 : :
2503 : : /*
2504 : : * Helper function for apply_handle_commit and apply_handle_stream_commit.
2505 : : */
2506 : : static void
1689 2507 : 482 : apply_handle_commit_internal(LogicalRepCommitData *commit_data)
2508 : : {
1454 2509 [ + + ]: 482 : if (is_skipping_changes())
2510 : : {
2511 : 2 : stop_skipping_changes();
2512 : :
2513 : : /*
2514 : : * Start a new transaction to clear the subskiplsn, if not started
2515 : : * yet.
2516 : : */
2517 [ + + ]: 2 : if (!IsTransactionState())
2518 : 1 : StartTransactionCommand();
2519 : : }
2520 : :
1857 2521 [ + - ]: 482 : if (IsTransactionState())
2522 : : {
2523 : : /*
2524 : : * The transaction is either non-empty or skipped, so we clear the
2525 : : * subskiplsn.
2526 : : */
1454 2527 : 482 : clear_subscription_skip_lsn(commit_data->commit_lsn);
2528 : :
2529 : : /*
2530 : : * Update origin state so we can restart streaming from correct
2531 : : * position in case of crash.
2532 : : */
46 msawada@postgresql.o 2533 :GNC 482 : replorigin_xact_state.origin_lsn = commit_data->end_lsn;
2534 : 482 : replorigin_xact_state.origin_timestamp = commit_data->committime;
2535 : :
1934 akapila@postgresql.o 2536 :CBC 482 : CommitTransactionCommand();
2537 : :
1161 2538 [ + + ]: 482 : if (IsTransactionBlock())
2539 : : {
2540 : 4 : EndTransactionBlock(false);
2541 : 4 : CommitTransactionCommand();
2542 : : }
2543 : :
1934 2544 : 482 : pgstat_report_stat(false);
2545 : :
1161 2546 : 482 : store_flush_position(commit_data->end_lsn, XactLastCommitEnd);
2547 : : }
2548 : : else
2549 : : {
2550 : : /* Process any invalidation messages that might have accumulated. */
1934 akapila@postgresql.o 2551 :UBC 0 : AcceptInvalidationMessages();
2552 : 0 : maybe_reread_subscription();
2553 : : }
2554 : :
1934 akapila@postgresql.o 2555 :CBC 482 : in_remote_transaction = false;
2556 : 482 : }
2557 : :
2558 : : /*
2559 : : * Handle RELATION message.
2560 : : *
2561 : : * Note we don't do validation against local schema here. The validation
2562 : : * against local schema is postponed until first change for given relation
2563 : : * comes as we only care about it when applying changes for it anyway and we
2564 : : * do less locking this way.
2565 : : */
2566 : : static void
3342 peter_e@gmx.net 2567 : 485 : apply_handle_relation(StringInfo s)
2568 : : {
2569 : : LogicalRepRelation *rel;
2570 : :
1935 akapila@postgresql.o 2571 [ + + ]: 485 : if (handle_streamed_transaction(LOGICAL_REP_MSG_RELATION, s))
2019 2572 : 36 : return;
2573 : :
3342 peter_e@gmx.net 2574 : 449 : rel = logicalrep_read_rel(s);
2575 : 449 : logicalrep_relmap_update(rel);
2576 : :
2577 : : /* Also reset all entries in the partition map that refer to remoterel. */
1368 akapila@postgresql.o 2578 : 449 : logicalrep_partmap_reset_relmap(rel);
2579 : : }
2580 : :
2581 : : /*
2582 : : * Handle TYPE message.
2583 : : *
2584 : : * This implementation pays no attention to TYPE messages; we expect the user
2585 : : * to have set things up so that the incoming data is acceptable to the input
2586 : : * functions for the locally subscribed tables. Hence, we just read and
2587 : : * discard the message.
2588 : : */
2589 : : static void
3342 peter_e@gmx.net 2590 : 18 : apply_handle_type(StringInfo s)
2591 : : {
2592 : : LogicalRepTyp typ;
2593 : :
1935 akapila@postgresql.o 2594 [ - + ]: 18 : if (handle_streamed_transaction(LOGICAL_REP_MSG_TYPE, s))
2019 akapila@postgresql.o 2595 :UBC 0 : return;
2596 : :
3342 peter_e@gmx.net 2597 :CBC 18 : logicalrep_read_typ(s, &typ);
2598 : : }
2599 : :
2600 : : /*
2601 : : * Check that we (the subscription owner) have sufficient privileges on the
2602 : : * target relation to perform the given operation.
2603 : : */
2604 : : static void
1528 jdavis@postgresql.or 2605 : 220556 : TargetPrivilegesCheck(Relation rel, AclMode mode)
2606 : : {
2607 : : Oid relid;
2608 : : AclResult aclresult;
2609 : :
2610 : 220556 : relid = RelationGetRelid(rel);
2611 : 220556 : aclresult = pg_class_aclcheck(relid, GetUserId(), mode);
2612 [ + + ]: 220556 : if (aclresult != ACLCHECK_OK)
2613 : 10 : aclcheck_error(aclresult,
2614 : 10 : get_relkind_objtype(rel->rd_rel->relkind),
2615 : 10 : get_rel_name(relid));
2616 : :
2617 : : /*
2618 : : * We lack the infrastructure to honor RLS policies. It might be possible
2619 : : * to add such infrastructure here, but tablesync workers lack it, too, so
2620 : : * we don't bother. RLS does not ordinarily apply to TRUNCATE commands,
2621 : : * but it seems dangerous to replicate a TRUNCATE and then refuse to
2622 : : * replicate subsequent INSERTs, so we forbid all commands the same.
2623 : : */
2624 [ + + ]: 220546 : if (check_enable_rls(relid, InvalidOid, false) == RLS_ENABLED)
2625 [ + - ]: 4 : ereport(ERROR,
2626 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2627 : : errmsg("user \"%s\" cannot replicate into relation with row-level security enabled: \"%s\"",
2628 : : GetUserNameFromId(GetUserId(), true),
2629 : : RelationGetRelationName(rel))));
2630 : 220542 : }
2631 : :
2632 : : /*
2633 : : * Handle INSERT message.
2634 : : */
2635 : :
2636 : : static void
3342 peter_e@gmx.net 2637 : 186090 : apply_handle_insert(StringInfo s)
2638 : : {
2639 : : LogicalRepRelMapEntry *rel;
2640 : : LogicalRepTupleData newtup;
2641 : : LogicalRepRelId relid;
2642 : : UserContext ucxt;
2643 : : ApplyExecutionData *edata;
2644 : : EState *estate;
2645 : : TupleTableSlot *remoteslot;
2646 : : MemoryContext oldctx;
2647 : : bool run_as_owner;
2648 : :
2649 : : /*
2650 : : * Quick return if we are skipping data modification changes or handling
2651 : : * streamed transactions.
2652 : : */
1454 akapila@postgresql.o 2653 [ + + + + ]: 362179 : if (is_skipping_changes() ||
2654 : 176089 : handle_streamed_transaction(LOGICAL_REP_MSG_INSERT, s))
2019 2655 : 110060 : return;
2656 : :
1739 tgl@sss.pgh.pa.us 2657 : 76081 : begin_replication_step();
2658 : :
3342 peter_e@gmx.net 2659 : 76079 : relid = logicalrep_read_insert(s, &newtup);
2660 : 76079 : rel = logicalrep_rel_open(relid, RowExclusiveLock);
3279 2661 [ + + ]: 76072 : if (!should_apply_changes_for_rel(rel))
2662 : : {
2663 : : /*
2664 : : * The relation can't become interesting in the middle of the
2665 : : * transaction so it's safe to unlock it.
2666 : : */
2667 : 51 : logicalrep_rel_close(rel, RowExclusiveLock);
1739 tgl@sss.pgh.pa.us 2668 : 51 : end_replication_step();
3279 peter_e@gmx.net 2669 : 51 : return;
2670 : : }
2671 : :
2672 : : /*
2673 : : * Make sure that any user-supplied code runs as the table owner, unless
2674 : : * the user has opted out of that behavior.
2675 : : */
1076 rhaas@postgresql.org 2676 : 76021 : run_as_owner = MySubscription->runasowner;
2677 [ + + ]: 76021 : if (!run_as_owner)
2678 : 76012 : SwitchToUntrustedUser(rel->localrel->rd_rel->relowner, &ucxt);
2679 : :
2680 : : /* Set relation for error callback */
1661 akapila@postgresql.o 2681 : 76021 : apply_error_callback_arg.rel = rel;
2682 : :
2683 : : /* Initialize the executor state. */
1758 tgl@sss.pgh.pa.us 2684 : 76021 : edata = create_edata_for_relation(rel);
2685 : 76021 : estate = edata->estate;
2949 andres@anarazel.de 2686 : 76021 : remoteslot = ExecInitExtraTupleSlot(estate,
2677 2687 : 76021 : RelationGetDescr(rel->localrel),
2688 : : &TTSOpsVirtual);
2689 : :
2690 : : /* Process and store remote tuple in the slot */
3342 peter_e@gmx.net 2691 [ - + ]: 76021 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
2066 tgl@sss.pgh.pa.us 2692 : 76021 : slot_store_data(remoteslot, rel, &newtup);
3342 peter_e@gmx.net 2693 : 76021 : slot_fill_defaults(rel, estate, remoteslot);
2694 : 76021 : MemoryContextSwitchTo(oldctx);
2695 : :
2696 : : /* For a partitioned table, insert the tuple into a partition. */
2169 peter@eisentraut.org 2697 [ + + ]: 76021 : if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
1758 tgl@sss.pgh.pa.us 2698 : 66 : apply_handle_tuple_routing(edata,
2699 : : remoteslot, NULL, CMD_INSERT);
2700 : : else
2701 : : {
389 2702 : 75955 : ResultRelInfo *relinfo = edata->targetRelInfo;
2703 : :
341 akapila@postgresql.o 2704 : 75955 : ExecOpenIndices(relinfo, false);
389 tgl@sss.pgh.pa.us 2705 : 75955 : apply_handle_insert_internal(edata, relinfo, remoteslot);
2706 : 75938 : ExecCloseIndices(relinfo);
2707 : : }
2708 : :
1758 2709 : 75982 : finish_edata(edata);
2710 : :
2711 : : /* Reset relation for error callback */
1661 akapila@postgresql.o 2712 : 75982 : apply_error_callback_arg.rel = NULL;
2713 : :
1076 rhaas@postgresql.org 2714 [ + + ]: 75982 : if (!run_as_owner)
2715 : 75977 : RestoreUserContext(&ucxt);
2716 : :
3342 peter_e@gmx.net 2717 : 75982 : logicalrep_rel_close(rel, NoLock);
2718 : :
1739 tgl@sss.pgh.pa.us 2719 : 75982 : end_replication_step();
2720 : : }
2721 : :
2722 : : /*
2723 : : * Workhorse for apply_handle_insert()
2724 : : * relinfo is for the relation we're actually inserting into
2725 : : * (could be a child partition of edata->targetRelInfo)
2726 : : */
2727 : : static void
1758 2728 : 76022 : apply_handle_insert_internal(ApplyExecutionData *edata,
2729 : : ResultRelInfo *relinfo,
2730 : : TupleTableSlot *remoteslot)
2731 : : {
2732 : 76022 : EState *estate = edata->estate;
2733 : :
2734 : : /* Caller should have opened indexes already. */
389 2735 [ + + + + : 76022 : Assert(relinfo->ri_IndexRelationDescs != NULL ||
- + ]
2736 : : !relinfo->ri_RelationDesc->rd_rel->relhasindex ||
2737 : : RelationGetIndexList(relinfo->ri_RelationDesc) == NIL);
2738 : :
2739 : : /* Caller will not have done this bit. */
2740 [ - + ]: 76022 : Assert(relinfo->ri_onConflictArbiterIndexes == NIL);
572 akapila@postgresql.o 2741 : 76022 : InitConflictIndexes(relinfo);
2742 : :
2743 : : /* Do the insert. */
1528 jdavis@postgresql.or 2744 : 76022 : TargetPrivilegesCheck(relinfo->ri_RelationDesc, ACL_INSERT);
1978 heikki.linnakangas@i 2745 : 76014 : ExecSimpleRelationInsert(relinfo, estate, remoteslot);
2182 peter@eisentraut.org 2746 : 75983 : }
2747 : :
2748 : : /*
2749 : : * Check if the logical replication relation is updatable and throw
2750 : : * appropriate error if it isn't.
2751 : : */
2752 : : static void
3342 peter_e@gmx.net 2753 : 72293 : check_relation_updatable(LogicalRepRelMapEntry *rel)
2754 : : {
2755 : : /*
2756 : : * For partitioned tables, we only need to care if the target partition is
2757 : : * updatable (aka has PK or RI defined for it).
2758 : : */
1363 akapila@postgresql.o 2759 [ + + ]: 72293 : if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
2760 : 30 : return;
2761 : :
2762 : : /* Updatable, no error. */
3342 peter_e@gmx.net 2763 [ + - ]: 72263 : if (rel->updatable)
2764 : 72263 : return;
2765 : :
2766 : : /*
2767 : : * We are in error mode so it's fine this is somewhat slow. It's better to
2768 : : * give user correct error.
2769 : : */
3342 peter_e@gmx.net 2770 [ # # ]:UBC 0 : if (OidIsValid(GetRelationIdentityOrPK(rel->localrel)))
2771 : : {
2772 [ # # ]: 0 : ereport(ERROR,
2773 : : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
2774 : : errmsg("publisher did not send replica identity column "
2775 : : "expected by the logical replication target relation \"%s.%s\"",
2776 : : rel->remoterel.nspname, rel->remoterel.relname)));
2777 : : }
2778 : :
2779 [ # # ]: 0 : ereport(ERROR,
2780 : : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
2781 : : errmsg("logical replication target relation \"%s.%s\" has "
2782 : : "neither REPLICA IDENTITY index nor PRIMARY "
2783 : : "KEY and published relation does not have "
2784 : : "REPLICA IDENTITY FULL",
2785 : : rel->remoterel.nspname, rel->remoterel.relname)));
2786 : : }
2787 : :
2788 : : /*
2789 : : * Handle UPDATE message.
2790 : : *
2791 : : * TODO: FDW support
2792 : : */
2793 : : static void
3342 peter_e@gmx.net 2794 :CBC 66166 : apply_handle_update(StringInfo s)
2795 : : {
2796 : : LogicalRepRelMapEntry *rel;
2797 : : LogicalRepRelId relid;
2798 : : UserContext ucxt;
2799 : : ApplyExecutionData *edata;
2800 : : EState *estate;
2801 : : LogicalRepTupleData oldtup;
2802 : : LogicalRepTupleData newtup;
2803 : : bool has_oldtup;
2804 : : TupleTableSlot *remoteslot;
2805 : : RTEPermissionInfo *target_perminfo;
2806 : : MemoryContext oldctx;
2807 : : bool run_as_owner;
2808 : :
2809 : : /*
2810 : : * Quick return if we are skipping data modification changes or handling
2811 : : * streamed transactions.
2812 : : */
1454 akapila@postgresql.o 2813 [ + + + + ]: 132329 : if (is_skipping_changes() ||
2814 : 66163 : handle_streamed_transaction(LOGICAL_REP_MSG_UPDATE, s))
2019 2815 : 34223 : return;
2816 : :
1739 tgl@sss.pgh.pa.us 2817 : 31943 : begin_replication_step();
2818 : :
3342 peter_e@gmx.net 2819 : 31942 : relid = logicalrep_read_update(s, &has_oldtup, &oldtup,
2820 : : &newtup);
2821 : 31942 : rel = logicalrep_rel_open(relid, RowExclusiveLock);
3279 2822 [ - + ]: 31942 : if (!should_apply_changes_for_rel(rel))
2823 : : {
2824 : : /*
2825 : : * The relation can't become interesting in the middle of the
2826 : : * transaction so it's safe to unlock it.
2827 : : */
3279 peter_e@gmx.net 2828 :UBC 0 : logicalrep_rel_close(rel, RowExclusiveLock);
1739 tgl@sss.pgh.pa.us 2829 : 0 : end_replication_step();
3279 peter_e@gmx.net 2830 : 0 : return;
2831 : : }
2832 : :
2833 : : /* Set relation for error callback */
1661 akapila@postgresql.o 2834 :CBC 31942 : apply_error_callback_arg.rel = rel;
2835 : :
2836 : : /* Check if we can do the update. */
3342 peter_e@gmx.net 2837 : 31942 : check_relation_updatable(rel);
2838 : :
2839 : : /*
2840 : : * Make sure that any user-supplied code runs as the table owner, unless
2841 : : * the user has opted out of that behavior.
2842 : : */
1076 rhaas@postgresql.org 2843 : 31942 : run_as_owner = MySubscription->runasowner;
2844 [ + + ]: 31942 : if (!run_as_owner)
2845 : 31938 : SwitchToUntrustedUser(rel->localrel->rd_rel->relowner, &ucxt);
2846 : :
2847 : : /* Initialize the executor state. */
1758 tgl@sss.pgh.pa.us 2848 : 31941 : edata = create_edata_for_relation(rel);
2849 : 31941 : estate = edata->estate;
2949 andres@anarazel.de 2850 : 31941 : remoteslot = ExecInitExtraTupleSlot(estate,
2677 2851 : 31941 : RelationGetDescr(rel->localrel),
2852 : : &TTSOpsVirtual);
2853 : :
2854 : : /*
2855 : : * Populate updatedCols so that per-column triggers can fire, and so
2856 : : * executor can correctly pass down indexUnchanged hint. This could
2857 : : * include more columns than were actually changed on the publisher
2858 : : * because the logical replication protocol doesn't contain that
2859 : : * information. But it would for example exclude columns that only exist
2860 : : * on the subscriber, since we are not touching those.
2861 : : */
1195 alvherre@alvh.no-ip. 2862 : 31941 : target_perminfo = list_nth(estate->es_rteperminfos, 0);
2260 peter@eisentraut.org 2863 [ + + ]: 159325 : for (int i = 0; i < remoteslot->tts_tupleDescriptor->natts; i++)
2864 : : {
144 drowley@postgresql.o 2865 :GNC 127384 : CompactAttribute *att = TupleDescCompactAttr(remoteslot->tts_tupleDescriptor, i);
2064 tgl@sss.pgh.pa.us 2866 :CBC 127384 : int remoteattnum = rel->attrmap->attnums[i];
2867 : :
2868 [ + + + + ]: 127384 : if (!att->attisdropped && remoteattnum >= 0)
2869 : : {
2870 [ - + ]: 68867 : Assert(remoteattnum < newtup.ncols);
2871 [ + - ]: 68867 : if (newtup.colstatus[remoteattnum] != LOGICALREP_COLUMN_UNCHANGED)
1195 alvherre@alvh.no-ip. 2872 : 68867 : target_perminfo->updatedCols =
2873 : 68867 : bms_add_member(target_perminfo->updatedCols,
2874 : : i + 1 - FirstLowInvalidHeapAttributeNumber);
2875 : : }
2876 : : }
2877 : :
2878 : : /* Build the search tuple. */
3342 peter_e@gmx.net 2879 [ - + ]: 31941 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
2066 tgl@sss.pgh.pa.us 2880 : 31941 : slot_store_data(remoteslot, rel,
2881 [ + + ]: 31941 : has_oldtup ? &oldtup : &newtup);
3342 peter_e@gmx.net 2882 : 31941 : MemoryContextSwitchTo(oldctx);
2883 : :
2884 : : /* For a partitioned table, apply update to correct partition. */
2169 peter@eisentraut.org 2885 [ + + ]: 31941 : if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
1758 tgl@sss.pgh.pa.us 2886 : 13 : apply_handle_tuple_routing(edata,
2887 : : remoteslot, &newtup, CMD_UPDATE);
2888 : : else
2889 : 31928 : apply_handle_update_internal(edata, edata->targetRelInfo,
2890 : : remoteslot, &newtup, rel->localindexoid);
2891 : :
2892 : 31933 : finish_edata(edata);
2893 : :
2894 : : /* Reset relation for error callback */
1661 akapila@postgresql.o 2895 : 31933 : apply_error_callback_arg.rel = NULL;
2896 : :
1076 rhaas@postgresql.org 2897 [ + + ]: 31933 : if (!run_as_owner)
2898 : 31931 : RestoreUserContext(&ucxt);
2899 : :
2182 peter@eisentraut.org 2900 : 31933 : logicalrep_rel_close(rel, NoLock);
2901 : :
1739 tgl@sss.pgh.pa.us 2902 : 31933 : end_replication_step();
2903 : : }
2904 : :
2905 : : /*
2906 : : * Workhorse for apply_handle_update()
2907 : : * relinfo is for the relation we're actually updating in
2908 : : * (could be a child partition of edata->targetRelInfo)
2909 : : */
2910 : : static void
1758 2911 : 31928 : apply_handle_update_internal(ApplyExecutionData *edata,
2912 : : ResultRelInfo *relinfo,
2913 : : TupleTableSlot *remoteslot,
2914 : : LogicalRepTupleData *newtup,
2915 : : Oid localindexoid)
2916 : : {
2917 : 31928 : EState *estate = edata->estate;
2918 : 31928 : LogicalRepRelMapEntry *relmapentry = edata->targetRel;
2182 peter@eisentraut.org 2919 : 31928 : Relation localrel = relinfo->ri_RelationDesc;
2920 : : EPQState epqstate;
356 akapila@postgresql.o 2921 : 31928 : TupleTableSlot *localslot = NULL;
2922 : 31928 : ConflictTupleInfo conflicttuple = {0};
2923 : : bool found;
2924 : : MemoryContext oldctx;
2925 : :
1031 tgl@sss.pgh.pa.us 2926 : 31928 : EvalPlanQualInit(&epqstate, estate, NULL, NIL, -1, NIL);
341 akapila@postgresql.o 2927 : 31928 : ExecOpenIndices(relinfo, false);
2928 : :
964 msawada@postgresql.o 2929 : 31928 : found = FindReplTupleInLocalRel(edata, localrel,
2930 : : &relmapentry->remoterel,
2931 : : localindexoid,
2932 : : remoteslot, &localslot);
2933 : :
2934 : : /*
2935 : : * Tuple found.
2936 : : *
2937 : : * Note this will fail if there are other conflicting unique indexes.
2938 : : */
3342 peter_e@gmx.net 2939 [ + + ]: 31922 : if (found)
2940 : : {
2941 : : /*
2942 : : * Report the conflict if the tuple was modified by a different
2943 : : * origin.
2944 : : */
356 akapila@postgresql.o 2945 [ + + ]: 31913 : if (GetTupleTransactionInfo(localslot, &conflicttuple.xmin,
2946 : 2 : &conflicttuple.origin, &conflicttuple.ts) &&
46 msawada@postgresql.o 2947 [ + - ]:GNC 2 : conflicttuple.origin != replorigin_xact_state.origin)
2948 : : {
2949 : : TupleTableSlot *newslot;
2950 : :
2951 : : /* Store the new tuple for conflict reporting */
572 akapila@postgresql.o 2952 :CBC 2 : newslot = table_slot_create(localrel, &estate->es_tupleTable);
2953 : 2 : slot_store_data(newslot, relmapentry, newtup);
2954 : :
356 2955 : 2 : conflicttuple.slot = localslot;
2956 : :
563 2957 : 2 : ReportApplyConflict(estate, relinfo, LOG, CT_UPDATE_ORIGIN_DIFFERS,
2958 : : remoteslot, newslot,
356 2959 : 2 : list_make1(&conflicttuple));
2960 : : }
2961 : :
2962 : : /* Process and store remote tuple in the slot */
3342 peter_e@gmx.net 2963 [ + - ]: 31913 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
2066 tgl@sss.pgh.pa.us 2964 : 31913 : slot_modify_data(remoteslot, localslot, relmapentry, newtup);
3342 peter_e@gmx.net 2965 : 31913 : MemoryContextSwitchTo(oldctx);
2966 : :
2967 : 31913 : EvalPlanQualSetSlot(&epqstate, remoteslot);
2968 : :
572 akapila@postgresql.o 2969 : 31913 : InitConflictIndexes(relinfo);
2970 : :
2971 : : /* Do the actual update. */
1528 jdavis@postgresql.or 2972 : 31913 : TargetPrivilegesCheck(relinfo->ri_RelationDesc, ACL_UPDATE);
1978 heikki.linnakangas@i 2973 : 31913 : ExecSimpleRelationUpdate(relinfo, estate, &epqstate, localslot,
2974 : : remoteslot);
2975 : : }
2976 : : else
2977 : : {
2978 : : ConflictType type;
572 akapila@postgresql.o 2979 : 9 : TupleTableSlot *newslot = localslot;
2980 : :
2981 : : /*
2982 : : * Detecting whether the tuple was recently deleted or never existed
2983 : : * is crucial to avoid misleading the user during conflict handling.
2984 : : */
223 akapila@postgresql.o 2985 [ + + ]:GNC 9 : if (FindDeletedTupleInLocalRel(localrel, localindexoid, remoteslot,
2986 : : &conflicttuple.xmin,
2987 : : &conflicttuple.origin,
2988 : 3 : &conflicttuple.ts) &&
46 msawada@postgresql.o 2989 [ + - ]: 3 : conflicttuple.origin != replorigin_xact_state.origin)
223 akapila@postgresql.o 2990 : 3 : type = CT_UPDATE_DELETED;
2991 : : else
2992 : 6 : type = CT_UPDATE_MISSING;
2993 : :
2994 : : /* Store the new tuple for conflict reporting */
572 akapila@postgresql.o 2995 :CBC 9 : slot_store_data(newslot, relmapentry, newtup);
2996 : :
2997 : : /*
2998 : : * The tuple to be updated could not be found or was deleted. Do
2999 : : * nothing except for emitting a log message.
3000 : : */
223 akapila@postgresql.o 3001 :GNC 9 : ReportApplyConflict(estate, relinfo, LOG, type, remoteslot, newslot,
3002 : 9 : list_make1(&conflicttuple));
3003 : : }
3004 : :
3005 : : /* Cleanup. */
2182 peter@eisentraut.org 3006 :CBC 31920 : ExecCloseIndices(relinfo);
3342 peter_e@gmx.net 3007 : 31920 : EvalPlanQualEnd(&epqstate);
3008 : 31920 : }
3009 : :
3010 : : /*
3011 : : * Handle DELETE message.
3012 : : *
3013 : : * TODO: FDW support
3014 : : */
3015 : : static void
3016 : 81936 : apply_handle_delete(StringInfo s)
3017 : : {
3018 : : LogicalRepRelMapEntry *rel;
3019 : : LogicalRepTupleData oldtup;
3020 : : LogicalRepRelId relid;
3021 : : UserContext ucxt;
3022 : : ApplyExecutionData *edata;
3023 : : EState *estate;
3024 : : TupleTableSlot *remoteslot;
3025 : : MemoryContext oldctx;
3026 : : bool run_as_owner;
3027 : :
3028 : : /*
3029 : : * Quick return if we are skipping data modification changes or handling
3030 : : * streamed transactions.
3031 : : */
1454 akapila@postgresql.o 3032 [ + - + + ]: 163872 : if (is_skipping_changes() ||
3033 : 81936 : handle_streamed_transaction(LOGICAL_REP_MSG_DELETE, s))
2019 3034 : 41615 : return;
3035 : :
1739 tgl@sss.pgh.pa.us 3036 : 40321 : begin_replication_step();
3037 : :
3342 peter_e@gmx.net 3038 : 40321 : relid = logicalrep_read_delete(s, &oldtup);
3039 : 40321 : rel = logicalrep_rel_open(relid, RowExclusiveLock);
3279 3040 [ - + ]: 40321 : if (!should_apply_changes_for_rel(rel))
3041 : : {
3042 : : /*
3043 : : * The relation can't become interesting in the middle of the
3044 : : * transaction so it's safe to unlock it.
3045 : : */
3279 peter_e@gmx.net 3046 :UBC 0 : logicalrep_rel_close(rel, RowExclusiveLock);
1739 tgl@sss.pgh.pa.us 3047 : 0 : end_replication_step();
3279 peter_e@gmx.net 3048 : 0 : return;
3049 : : }
3050 : :
3051 : : /* Set relation for error callback */
1661 akapila@postgresql.o 3052 :CBC 40321 : apply_error_callback_arg.rel = rel;
3053 : :
3054 : : /* Check if we can do the delete. */
3342 peter_e@gmx.net 3055 : 40321 : check_relation_updatable(rel);
3056 : :
3057 : : /*
3058 : : * Make sure that any user-supplied code runs as the table owner, unless
3059 : : * the user has opted out of that behavior.
3060 : : */
1076 rhaas@postgresql.org 3061 : 40321 : run_as_owner = MySubscription->runasowner;
3062 [ + + ]: 40321 : if (!run_as_owner)
3063 : 40319 : SwitchToUntrustedUser(rel->localrel->rd_rel->relowner, &ucxt);
3064 : :
3065 : : /* Initialize the executor state. */
1758 tgl@sss.pgh.pa.us 3066 : 40321 : edata = create_edata_for_relation(rel);
3067 : 40321 : estate = edata->estate;
2949 andres@anarazel.de 3068 : 40321 : remoteslot = ExecInitExtraTupleSlot(estate,
2677 3069 : 40321 : RelationGetDescr(rel->localrel),
3070 : : &TTSOpsVirtual);
3071 : :
3072 : : /* Build the search tuple. */
3342 peter_e@gmx.net 3073 [ - + ]: 40321 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
2066 tgl@sss.pgh.pa.us 3074 : 40321 : slot_store_data(remoteslot, rel, &oldtup);
3342 peter_e@gmx.net 3075 : 40321 : MemoryContextSwitchTo(oldctx);
3076 : :
3077 : : /* For a partitioned table, apply delete to correct partition. */
2169 peter@eisentraut.org 3078 [ + + ]: 40321 : if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
1758 tgl@sss.pgh.pa.us 3079 : 17 : apply_handle_tuple_routing(edata,
3080 : : remoteslot, NULL, CMD_DELETE);
3081 : : else
3082 : : {
389 3083 : 40304 : ResultRelInfo *relinfo = edata->targetRelInfo;
3084 : :
3085 : 40304 : ExecOpenIndices(relinfo, false);
3086 : 40304 : apply_handle_delete_internal(edata, relinfo,
3087 : : remoteslot, rel->localindexoid);
3088 : 40304 : ExecCloseIndices(relinfo);
3089 : : }
3090 : :
1758 3091 : 40321 : finish_edata(edata);
3092 : :
3093 : : /* Reset relation for error callback */
1661 akapila@postgresql.o 3094 : 40321 : apply_error_callback_arg.rel = NULL;
3095 : :
1076 rhaas@postgresql.org 3096 [ + + ]: 40321 : if (!run_as_owner)
3097 : 40319 : RestoreUserContext(&ucxt);
3098 : :
2182 peter@eisentraut.org 3099 : 40321 : logicalrep_rel_close(rel, NoLock);
3100 : :
1739 tgl@sss.pgh.pa.us 3101 : 40321 : end_replication_step();
3102 : : }
3103 : :
3104 : : /*
3105 : : * Workhorse for apply_handle_delete()
3106 : : * relinfo is for the relation we're actually deleting from
3107 : : * (could be a child partition of edata->targetRelInfo)
3108 : : */
3109 : : static void
1758 3110 : 40321 : apply_handle_delete_internal(ApplyExecutionData *edata,
3111 : : ResultRelInfo *relinfo,
3112 : : TupleTableSlot *remoteslot,
3113 : : Oid localindexoid)
3114 : : {
3115 : 40321 : EState *estate = edata->estate;
2182 peter@eisentraut.org 3116 : 40321 : Relation localrel = relinfo->ri_RelationDesc;
1758 tgl@sss.pgh.pa.us 3117 : 40321 : LogicalRepRelation *remoterel = &edata->targetRel->remoterel;
3118 : : EPQState epqstate;
3119 : : TupleTableSlot *localslot;
356 akapila@postgresql.o 3120 : 40321 : ConflictTupleInfo conflicttuple = {0};
3121 : : bool found;
3122 : :
1031 tgl@sss.pgh.pa.us 3123 : 40321 : EvalPlanQualInit(&epqstate, estate, NULL, NIL, -1, NIL);
3124 : :
3125 : : /* Caller should have opened indexes already. */
389 3126 [ + + + + : 40321 : Assert(relinfo->ri_IndexRelationDescs != NULL ||
- + ]
3127 : : !localrel->rd_rel->relhasindex ||
3128 : : RelationGetIndexList(localrel) == NIL);
3129 : :
964 msawada@postgresql.o 3130 : 40321 : found = FindReplTupleInLocalRel(edata, localrel, remoterel, localindexoid,
3131 : : remoteslot, &localslot);
3132 : :
3133 : : /* If found delete it. */
3342 peter_e@gmx.net 3134 [ + + ]: 40321 : if (found)
3135 : : {
3136 : : /*
3137 : : * Report the conflict if the tuple was modified by a different
3138 : : * origin.
3139 : : */
356 akapila@postgresql.o 3140 [ + + ]: 40312 : if (GetTupleTransactionInfo(localslot, &conflicttuple.xmin,
3141 : 6 : &conflicttuple.origin, &conflicttuple.ts) &&
46 msawada@postgresql.o 3142 [ + + ]:GNC 6 : conflicttuple.origin != replorigin_xact_state.origin)
3143 : : {
356 akapila@postgresql.o 3144 :CBC 5 : conflicttuple.slot = localslot;
563 3145 : 5 : ReportApplyConflict(estate, relinfo, LOG, CT_DELETE_ORIGIN_DIFFERS,
3146 : : remoteslot, NULL,
356 3147 : 5 : list_make1(&conflicttuple));
3148 : : }
3149 : :
3342 peter_e@gmx.net 3150 : 40312 : EvalPlanQualSetSlot(&epqstate, localslot);
3151 : :
3152 : : /* Do the actual delete. */
1528 jdavis@postgresql.or 3153 : 40312 : TargetPrivilegesCheck(relinfo->ri_RelationDesc, ACL_DELETE);
1978 heikki.linnakangas@i 3154 : 40312 : ExecSimpleRelationDelete(relinfo, estate, &epqstate, localslot);
3155 : : }
3156 : : else
3157 : : {
3158 : : /*
3159 : : * The tuple to be deleted could not be found. Do nothing except for
3160 : : * emitting a log message.
3161 : : */
572 akapila@postgresql.o 3162 : 9 : ReportApplyConflict(estate, relinfo, LOG, CT_DELETE_MISSING,
356 3163 : 9 : remoteslot, NULL, list_make1(&conflicttuple));
3164 : : }
3165 : :
3166 : : /* Cleanup. */
3342 peter_e@gmx.net 3167 : 40321 : EvalPlanQualEnd(&epqstate);
3168 : 40321 : }
3169 : :
3170 : : /*
3171 : : * Try to find a tuple received from the publication side (in 'remoteslot') in
3172 : : * the corresponding local relation using either replica identity index,
3173 : : * primary key, index or if needed, sequential scan.
3174 : : *
3175 : : * Local tuple, if found, is returned in '*localslot'.
3176 : : */
3177 : : static bool
964 msawada@postgresql.o 3178 : 72262 : FindReplTupleInLocalRel(ApplyExecutionData *edata, Relation localrel,
3179 : : LogicalRepRelation *remoterel,
3180 : : Oid localidxoid,
3181 : : TupleTableSlot *remoteslot,
3182 : : TupleTableSlot **localslot)
3183 : : {
3184 : 72262 : EState *estate = edata->estate;
3185 : : bool found;
3186 : :
3187 : : /*
3188 : : * Regardless of the top-level operation, we're performing a read here, so
3189 : : * check for SELECT privileges.
3190 : : */
1527 jdavis@postgresql.or 3191 : 72262 : TargetPrivilegesCheck(localrel, ACL_SELECT);
3192 : :
2174 peter@eisentraut.org 3193 : 72256 : *localslot = table_slot_create(localrel, &estate->es_tupleTable);
3194 : :
1096 akapila@postgresql.o 3195 [ + + - + ]: 72256 : Assert(OidIsValid(localidxoid) ||
3196 : : (remoterel->replident == REPLICA_IDENTITY_FULL));
3197 : :
3198 [ + + ]: 72256 : if (OidIsValid(localidxoid))
3199 : : {
3200 : : #ifdef USE_ASSERT_CHECKING
964 msawada@postgresql.o 3201 : 72105 : Relation idxrel = index_open(localidxoid, AccessShareLock);
3202 : :
3203 : : /* Index must be PK, RI, or usable for REPLICA IDENTITY FULL tables */
550 akapila@postgresql.o 3204 [ + + + - : 72105 : Assert(GetRelationIdentityOrPK(localrel) == localidxoid ||
- + ]
3205 : : (remoterel->replident == REPLICA_IDENTITY_FULL &&
3206 : : IsIndexUsableForReplicaIdentityFull(idxrel,
3207 : : edata->targetRel->attrmap)));
964 msawada@postgresql.o 3208 : 72105 : index_close(idxrel, AccessShareLock);
3209 : : #endif
3210 : :
1096 akapila@postgresql.o 3211 : 72105 : found = RelationFindReplTupleByIndex(localrel, localidxoid,
3212 : : LockTupleExclusive,
3213 : : remoteslot, *localslot);
3214 : : }
3215 : : else
2174 peter@eisentraut.org 3216 : 151 : found = RelationFindReplTupleSeq(localrel, LockTupleExclusive,
3217 : : remoteslot, *localslot);
3218 : :
3219 : 72256 : return found;
3220 : : }
3221 : :
3222 : : /*
3223 : : * Determine whether the index can reliably locate the deleted tuple in the
3224 : : * local relation.
3225 : : *
3226 : : * An index may exclude deleted tuples if it was re-indexed or re-created during
3227 : : * change application. Therefore, an index is considered usable only if the
3228 : : * conflict detection slot.xmin (conflict_detection_xmin) is greater than the
3229 : : * index tuple's xmin. This ensures that any tuples deleted prior to the index
3230 : : * creation or re-indexing are not relevant for conflict detection in the
3231 : : * current apply worker.
3232 : : *
3233 : : * Note that indexes may also be excluded if they were modified by other DDL
3234 : : * operations, such as ALTER INDEX. However, this is acceptable, as the
3235 : : * likelihood of such DDL changes coinciding with the need to scan dead
3236 : : * tuples for the update_deleted is low.
3237 : : */
3238 : : static bool
223 akapila@postgresql.o 3239 :GNC 1 : IsIndexUsableForFindingDeletedTuple(Oid localindexoid,
3240 : : TransactionId conflict_detection_xmin)
3241 : : {
3242 : : HeapTuple index_tuple;
3243 : : TransactionId index_xmin;
3244 : :
3245 : 1 : index_tuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(localindexoid));
3246 : :
3247 [ - + ]: 1 : if (!HeapTupleIsValid(index_tuple)) /* should not happen */
223 akapila@postgresql.o 3248 [ # # ]:UNC 0 : elog(ERROR, "cache lookup failed for index %u", localindexoid);
3249 : :
3250 : : /*
3251 : : * No need to check for a frozen transaction ID, as
3252 : : * TransactionIdPrecedes() manages it internally, treating it as falling
3253 : : * behind the conflict_detection_xmin.
3254 : : */
223 akapila@postgresql.o 3255 :GNC 1 : index_xmin = HeapTupleHeaderGetXmin(index_tuple->t_data);
3256 : :
3257 : 1 : ReleaseSysCache(index_tuple);
3258 : :
3259 : 1 : return TransactionIdPrecedes(index_xmin, conflict_detection_xmin);
3260 : : }
3261 : :
3262 : : /*
3263 : : * Attempts to locate a deleted tuple in the local relation that matches the
3264 : : * values of the tuple received from the publication side (in 'remoteslot').
3265 : : * The search is performed using either the replica identity index, primary
3266 : : * key, other available index, or a sequential scan if necessary.
3267 : : *
3268 : : * Returns true if the deleted tuple is found. If found, the transaction ID,
3269 : : * origin, and commit timestamp of the deletion are stored in '*delete_xid',
3270 : : * '*delete_origin', and '*delete_time' respectively.
3271 : : */
3272 : : static bool
3273 : 11 : FindDeletedTupleInLocalRel(Relation localrel, Oid localidxoid,
3274 : : TupleTableSlot *remoteslot,
3275 : : TransactionId *delete_xid, ReplOriginId *delete_origin,
3276 : : TimestampTz *delete_time)
3277 : : {
3278 : : TransactionId oldestxmin;
3279 : :
3280 : : /*
3281 : : * Return false if either dead tuples are not retained or commit timestamp
3282 : : * data is not available.
3283 : : */
3284 [ + + - + ]: 11 : if (!MySubscription->retaindeadtuples || !track_commit_timestamp)
3285 : 8 : return false;
3286 : :
3287 : : /*
3288 : : * For conflict detection, we use the leader worker's
3289 : : * oldest_nonremovable_xid value instead of invoking
3290 : : * GetOldestNonRemovableTransactionId() or using the conflict detection
3291 : : * slot's xmin. The oldest_nonremovable_xid acts as a threshold to
3292 : : * identify tuples that were recently deleted. These deleted tuples are no
3293 : : * longer visible to concurrent transactions. However, if a remote update
3294 : : * matches such a tuple, we log an update_deleted conflict.
3295 : : *
3296 : : * While GetOldestNonRemovableTransactionId() and slot.xmin may return
3297 : : * transaction IDs older than oldest_nonremovable_xid, for our current
3298 : : * purpose, it is acceptable to treat tuples deleted by transactions prior
3299 : : * to oldest_nonremovable_xid as update_missing conflicts.
3300 : : */
194 3301 [ + - ]: 3 : if (am_leader_apply_worker())
3302 : : {
3303 : 3 : oldestxmin = MyLogicalRepWorker->oldest_nonremovable_xid;
3304 : : }
3305 : : else
3306 : : {
3307 : : LogicalRepWorker *leader;
3308 : :
3309 : : /*
3310 : : * Obtain the information from the leader apply worker as only the
3311 : : * leader manages oldest_nonremovable_xid (see
3312 : : * maybe_advance_nonremovable_xid() for details).
3313 : : */
194 akapila@postgresql.o 3314 :UNC 0 : LWLockAcquire(LogicalRepWorkerLock, LW_SHARED);
138 3315 : 0 : leader = logicalrep_worker_find(WORKERTYPE_APPLY,
3316 : 0 : MyLogicalRepWorker->subid, InvalidOid,
3317 : : false);
187 3318 [ # # ]: 0 : if (!leader)
3319 : : {
3320 [ # # ]: 0 : ereport(ERROR,
3321 : : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
3322 : : errmsg("could not detect conflict as the leader apply worker has exited")));
3323 : : }
3324 : :
194 3325 : 0 : SpinLockAcquire(&leader->relmutex);
3326 : 0 : oldestxmin = leader->oldest_nonremovable_xid;
3327 : 0 : SpinLockRelease(&leader->relmutex);
3328 : 0 : LWLockRelease(LogicalRepWorkerLock);
3329 : : }
3330 : :
3331 : : /*
3332 : : * Return false if the leader apply worker has stopped retaining
3333 : : * information for detecting conflicts. This implies that update_deleted
3334 : : * can no longer be reliably detected.
3335 : : */
194 akapila@postgresql.o 3336 [ - + ]:GNC 3 : if (!TransactionIdIsValid(oldestxmin))
194 akapila@postgresql.o 3337 :UNC 0 : return false;
3338 : :
223 akapila@postgresql.o 3339 [ + + + - ]:GNC 4 : if (OidIsValid(localidxoid) &&
3340 : 1 : IsIndexUsableForFindingDeletedTuple(localidxoid, oldestxmin))
3341 : 1 : return RelationFindDeletedTupleInfoByIndex(localrel, localidxoid,
3342 : : remoteslot, oldestxmin,
3343 : : delete_xid, delete_origin,
3344 : : delete_time);
3345 : : else
3346 : 2 : return RelationFindDeletedTupleInfoSeq(localrel, remoteslot,
3347 : : oldestxmin, delete_xid,
3348 : : delete_origin, delete_time);
3349 : : }
3350 : :
3351 : : /*
3352 : : * This handles insert, update, delete on a partitioned table.
3353 : : */
3354 : : static void
1758 tgl@sss.pgh.pa.us 3355 :CBC 96 : apply_handle_tuple_routing(ApplyExecutionData *edata,
3356 : : TupleTableSlot *remoteslot,
3357 : : LogicalRepTupleData *newtup,
3358 : : CmdType operation)
3359 : : {
3360 : 96 : EState *estate = edata->estate;
3361 : 96 : LogicalRepRelMapEntry *relmapentry = edata->targetRel;
3362 : 96 : ResultRelInfo *relinfo = edata->targetRelInfo;
2169 peter@eisentraut.org 3363 : 96 : Relation parentrel = relinfo->ri_RelationDesc;
3364 : : ModifyTableState *mtstate;
3365 : : PartitionTupleRouting *proute;
3366 : : ResultRelInfo *partrelinfo;
3367 : : Relation partrel;
3368 : : TupleTableSlot *remoteslot_part;
3369 : : TupleConversionMap *map;
3370 : : MemoryContext oldctx;
1363 akapila@postgresql.o 3371 : 96 : LogicalRepRelMapEntry *part_entry = NULL;
3372 : 96 : AttrMap *attrmap = NULL;
3373 : :
3374 : : /* ModifyTableState is needed for ExecFindPartition(). */
1758 tgl@sss.pgh.pa.us 3375 : 96 : edata->mtstate = mtstate = makeNode(ModifyTableState);
2169 peter@eisentraut.org 3376 : 96 : mtstate->ps.plan = NULL;
3377 : 96 : mtstate->ps.state = estate;
3378 : 96 : mtstate->operation = operation;
3379 : 96 : mtstate->resultRelInfo = relinfo;
3380 : :
3381 : : /* ... as is PartitionTupleRouting. */
1758 tgl@sss.pgh.pa.us 3382 : 96 : edata->proute = proute = ExecSetupPartitionTupleRouting(estate, parentrel);
3383 : :
3384 : : /*
3385 : : * Find the partition to which the "search tuple" belongs.
3386 : : */
2169 peter@eisentraut.org 3387 [ - + ]: 96 : Assert(remoteslot != NULL);
3388 [ + - ]: 96 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
3389 : 96 : partrelinfo = ExecFindPartition(mtstate, relinfo, proute,
3390 : : remoteslot, estate);
3391 [ - + ]: 96 : Assert(partrelinfo != NULL);
3392 : 96 : partrel = partrelinfo->ri_RelationDesc;
3393 : :
3394 : : /*
3395 : : * Check for supported relkind. We need this since partitions might be of
3396 : : * unsupported relkinds; and the set of partitions can change, so checking
3397 : : * at CREATE/ALTER SUBSCRIPTION would be insufficient.
3398 : : */
1229 tgl@sss.pgh.pa.us 3399 : 96 : CheckSubscriptionRelkind(partrel->rd_rel->relkind,
143 akapila@postgresql.o 3400 :GNC 96 : relmapentry->remoterel.relkind,
1229 tgl@sss.pgh.pa.us 3401 :CBC 96 : get_namespace_name(RelationGetNamespace(partrel)),
3402 : 96 : RelationGetRelationName(partrel));
3403 : :
3404 : : /*
3405 : : * To perform any of the operations below, the tuple must match the
3406 : : * partition's rowtype. Convert if needed or just copy, using a dedicated
3407 : : * slot to store the tuple in any case.
3408 : : */
1973 heikki.linnakangas@i 3409 : 96 : remoteslot_part = partrelinfo->ri_PartitionTupleSlot;
2169 peter@eisentraut.org 3410 [ + + ]: 96 : if (remoteslot_part == NULL)
3411 : 63 : remoteslot_part = table_slot_create(partrel, &estate->es_tupleTable);
1199 alvherre@alvh.no-ip. 3412 : 96 : map = ExecGetRootToChildMap(partrelinfo, estate);
2169 peter@eisentraut.org 3413 [ + + ]: 96 : if (map != NULL)
3414 : : {
1363 akapila@postgresql.o 3415 : 33 : attrmap = map->attrMap;
3416 : 33 : remoteslot_part = execute_attr_map_slot(attrmap, remoteslot,
3417 : : remoteslot_part);
3418 : : }
3419 : : else
3420 : : {
2169 peter@eisentraut.org 3421 : 63 : remoteslot_part = ExecCopySlot(remoteslot_part, remoteslot);
3422 : 63 : slot_getallattrs(remoteslot_part);
3423 : : }
3424 : 96 : MemoryContextSwitchTo(oldctx);
3425 : :
3426 : : /* Check if we can do the update or delete on the leaf partition. */
1363 akapila@postgresql.o 3427 [ + + + + ]: 96 : if (operation == CMD_UPDATE || operation == CMD_DELETE)
3428 : : {
3429 : 30 : part_entry = logicalrep_partition_open(relmapentry, partrel,
3430 : : attrmap);
3431 : 30 : check_relation_updatable(part_entry);
3432 : : }
3433 : :
2169 peter@eisentraut.org 3434 [ + + + - ]: 96 : switch (operation)
3435 : : {
3436 : 66 : case CMD_INSERT:
1758 tgl@sss.pgh.pa.us 3437 : 66 : apply_handle_insert_internal(edata, partrelinfo,
3438 : : remoteslot_part);
2169 peter@eisentraut.org 3439 : 44 : break;
3440 : :
3441 : 17 : case CMD_DELETE:
1758 tgl@sss.pgh.pa.us 3442 : 17 : apply_handle_delete_internal(edata, partrelinfo,
3443 : : remoteslot_part,
3444 : : part_entry->localindexoid);
2169 peter@eisentraut.org 3445 : 17 : break;
3446 : :
3447 : 13 : case CMD_UPDATE:
3448 : :
3449 : : /*
3450 : : * For UPDATE, depending on whether or not the updated tuple
3451 : : * satisfies the partition's constraint, perform a simple UPDATE
3452 : : * of the partition or move the updated tuple into a different
3453 : : * suitable partition.
3454 : : */
3455 : : {
3456 : : TupleTableSlot *localslot;
3457 : : ResultRelInfo *partrelinfo_new;
3458 : : Relation partrel_new;
3459 : : bool found;
3460 : : EPQState epqstate;
356 akapila@postgresql.o 3461 : 13 : ConflictTupleInfo conflicttuple = {0};
3462 : :
3463 : : /* Get the matching local tuple from the partition. */
964 msawada@postgresql.o 3464 : 13 : found = FindReplTupleInLocalRel(edata, partrel,
3465 : : &part_entry->remoterel,
3466 : : part_entry->localindexoid,
3467 : : remoteslot_part, &localslot);
1738 tgl@sss.pgh.pa.us 3468 [ + + ]: 13 : if (!found)
3469 : : {
3470 : : ConflictType type;
572 akapila@postgresql.o 3471 : 2 : TupleTableSlot *newslot = localslot;
3472 : :
3473 : : /*
3474 : : * Detecting whether the tuple was recently deleted or
3475 : : * never existed is crucial to avoid misleading the user
3476 : : * during conflict handling.
3477 : : */
223 akapila@postgresql.o 3478 [ - + ]:GNC 2 : if (FindDeletedTupleInLocalRel(partrel,
3479 : : part_entry->localindexoid,
3480 : : remoteslot_part,
3481 : : &conflicttuple.xmin,
3482 : : &conflicttuple.origin,
223 akapila@postgresql.o 3483 :UNC 0 : &conflicttuple.ts) &&
46 msawada@postgresql.o 3484 [ # # ]: 0 : conflicttuple.origin != replorigin_xact_state.origin)
223 akapila@postgresql.o 3485 : 0 : type = CT_UPDATE_DELETED;
3486 : : else
223 akapila@postgresql.o 3487 :GNC 2 : type = CT_UPDATE_MISSING;
3488 : :
3489 : : /* Store the new tuple for conflict reporting */
572 akapila@postgresql.o 3490 :CBC 2 : slot_store_data(newslot, part_entry, newtup);
3491 : :
3492 : : /*
3493 : : * The tuple to be updated could not be found or was
3494 : : * deleted. Do nothing except for emitting a log message.
3495 : : */
356 3496 : 2 : ReportApplyConflict(estate, partrelinfo, LOG,
3497 : : type, remoteslot_part, newslot,
223 akapila@postgresql.o 3498 :GNC 2 : list_make1(&conflicttuple));
3499 : :
1738 tgl@sss.pgh.pa.us 3500 :CBC 2 : return;
3501 : : }
3502 : :
3503 : : /*
3504 : : * Report the conflict if the tuple was modified by a
3505 : : * different origin.
3506 : : */
356 akapila@postgresql.o 3507 [ + + ]: 11 : if (GetTupleTransactionInfo(localslot, &conflicttuple.xmin,
3508 : : &conflicttuple.origin,
3509 : 1 : &conflicttuple.ts) &&
46 msawada@postgresql.o 3510 [ + - ]:GNC 1 : conflicttuple.origin != replorigin_xact_state.origin)
3511 : : {
3512 : : TupleTableSlot *newslot;
3513 : :
3514 : : /* Store the new tuple for conflict reporting */
572 akapila@postgresql.o 3515 :CBC 1 : newslot = table_slot_create(partrel, &estate->es_tupleTable);
3516 : 1 : slot_store_data(newslot, part_entry, newtup);
3517 : :
356 3518 : 1 : conflicttuple.slot = localslot;
3519 : :
563 3520 : 1 : ReportApplyConflict(estate, partrelinfo, LOG, CT_UPDATE_ORIGIN_DIFFERS,
3521 : : remoteslot_part, newslot,
356 3522 : 1 : list_make1(&conflicttuple));
3523 : : }
3524 : :
3525 : : /*
3526 : : * Apply the update to the local tuple, putting the result in
3527 : : * remoteslot_part.
3528 : : */
1738 tgl@sss.pgh.pa.us 3529 [ + - ]: 11 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
3530 : 11 : slot_modify_data(remoteslot_part, localslot, part_entry,
3531 : : newtup);
3532 : 11 : MemoryContextSwitchTo(oldctx);
3533 : :
591 akapila@postgresql.o 3534 : 11 : EvalPlanQualInit(&epqstate, estate, NULL, NIL, -1, NIL);
3535 : :
3536 : : /*
3537 : : * Does the updated tuple still satisfy the current
3538 : : * partition's constraint?
3539 : : */
2006 tgl@sss.pgh.pa.us 3540 [ + - + + ]: 22 : if (!partrel->rd_rel->relispartition ||
2169 peter@eisentraut.org 3541 : 11 : ExecPartitionCheck(partrelinfo, remoteslot_part, estate,
3542 : : false))
3543 : : {
3544 : : /*
3545 : : * Yes, so simply UPDATE the partition. We don't call
3546 : : * apply_handle_update_internal() here, which would
3547 : : * normally do the following work, to avoid repeating some
3548 : : * work already done above to find the local tuple in the
3549 : : * partition.
3550 : : */
572 akapila@postgresql.o 3551 : 10 : InitConflictIndexes(partrelinfo);
3552 : :
2169 peter@eisentraut.org 3553 : 10 : EvalPlanQualSetSlot(&epqstate, remoteslot_part);
1528 jdavis@postgresql.or 3554 : 10 : TargetPrivilegesCheck(partrelinfo->ri_RelationDesc,
3555 : : ACL_UPDATE);
1978 heikki.linnakangas@i 3556 : 10 : ExecSimpleRelationUpdate(partrelinfo, estate, &epqstate,
3557 : : localslot, remoteslot_part);
3558 : : }
3559 : : else
3560 : : {
3561 : : /* Move the tuple into the new partition. */
3562 : :
3563 : : /*
3564 : : * New partition will be found using tuple routing, which
3565 : : * can only occur via the parent table. We might need to
3566 : : * convert the tuple to the parent's rowtype. Note that
3567 : : * this is the tuple found in the partition, not the
3568 : : * original search tuple received by this function.
3569 : : */
2169 peter@eisentraut.org 3570 [ + - ]: 1 : if (map)
3571 : : {
3572 : : TupleConversionMap *PartitionToRootMap =
1031 tgl@sss.pgh.pa.us 3573 : 1 : convert_tuples_by_name(RelationGetDescr(partrel),
3574 : : RelationGetDescr(parentrel));
3575 : :
3576 : : remoteslot =
2169 peter@eisentraut.org 3577 : 1 : execute_attr_map_slot(PartitionToRootMap->attrMap,
3578 : : remoteslot_part, remoteslot);
3579 : : }
3580 : : else
3581 : : {
2169 peter@eisentraut.org 3582 :UBC 0 : remoteslot = ExecCopySlot(remoteslot, remoteslot_part);
3583 : 0 : slot_getallattrs(remoteslot);
3584 : : }
3585 : :
3586 : : /* Find the new partition. */
2169 peter@eisentraut.org 3587 [ + - ]:CBC 1 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
3588 : 1 : partrelinfo_new = ExecFindPartition(mtstate, relinfo,
3589 : : proute, remoteslot,
3590 : : estate);
3591 : 1 : MemoryContextSwitchTo(oldctx);
3592 [ - + ]: 1 : Assert(partrelinfo_new != partrelinfo);
1229 tgl@sss.pgh.pa.us 3593 : 1 : partrel_new = partrelinfo_new->ri_RelationDesc;
3594 : :
3595 : : /* Check that new partition also has supported relkind. */
3596 : 1 : CheckSubscriptionRelkind(partrel_new->rd_rel->relkind,
143 akapila@postgresql.o 3597 :GNC 1 : relmapentry->remoterel.relkind,
1229 tgl@sss.pgh.pa.us 3598 :CBC 1 : get_namespace_name(RelationGetNamespace(partrel_new)),
3599 : 1 : RelationGetRelationName(partrel_new));
3600 : :
3601 : : /* DELETE old tuple found in the old partition. */
591 akapila@postgresql.o 3602 : 1 : EvalPlanQualSetSlot(&epqstate, localslot);
3603 : 1 : TargetPrivilegesCheck(partrelinfo->ri_RelationDesc, ACL_DELETE);
3604 : 1 : ExecSimpleRelationDelete(partrelinfo, estate, &epqstate, localslot);
3605 : :
3606 : : /* INSERT new tuple into the new partition. */
3607 : :
3608 : : /*
3609 : : * Convert the replacement tuple to match the destination
3610 : : * partition rowtype.
3611 : : */
2169 peter@eisentraut.org 3612 [ + - ]: 1 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
1973 heikki.linnakangas@i 3613 : 1 : remoteslot_part = partrelinfo_new->ri_PartitionTupleSlot;
2169 peter@eisentraut.org 3614 [ + - ]: 1 : if (remoteslot_part == NULL)
1229 tgl@sss.pgh.pa.us 3615 : 1 : remoteslot_part = table_slot_create(partrel_new,
3616 : : &estate->es_tupleTable);
1199 alvherre@alvh.no-ip. 3617 : 1 : map = ExecGetRootToChildMap(partrelinfo_new, estate);
2169 peter@eisentraut.org 3618 [ - + ]: 1 : if (map != NULL)
3619 : : {
2169 peter@eisentraut.org 3620 :UBC 0 : remoteslot_part = execute_attr_map_slot(map->attrMap,
3621 : : remoteslot,
3622 : : remoteslot_part);
3623 : : }
3624 : : else
3625 : : {
2169 peter@eisentraut.org 3626 :CBC 1 : remoteslot_part = ExecCopySlot(remoteslot_part,
3627 : : remoteslot);
3628 : 1 : slot_getallattrs(remoteslot);
3629 : : }
3630 : 1 : MemoryContextSwitchTo(oldctx);
1758 tgl@sss.pgh.pa.us 3631 : 1 : apply_handle_insert_internal(edata, partrelinfo_new,
3632 : : remoteslot_part);
3633 : : }
3634 : :
591 akapila@postgresql.o 3635 : 11 : EvalPlanQualEnd(&epqstate);
3636 : : }
2169 peter@eisentraut.org 3637 : 11 : break;
3638 : :
2169 peter@eisentraut.org 3639 :UBC 0 : default:
3640 [ # # ]: 0 : elog(ERROR, "unrecognized CmdType: %d", (int) operation);
3641 : : break;
3642 : : }
3643 : : }
3644 : :
3645 : : /*
3646 : : * Handle TRUNCATE message.
3647 : : *
3648 : : * TODO: FDW support
3649 : : */
3650 : : static void
2899 peter_e@gmx.net 3651 :CBC 20 : apply_handle_truncate(StringInfo s)
3652 : : {
2880 tgl@sss.pgh.pa.us 3653 : 20 : bool cascade = false;
3654 : 20 : bool restart_seqs = false;
3655 : 20 : List *remote_relids = NIL;
3656 : 20 : List *remote_rels = NIL;
3657 : 20 : List *rels = NIL;
2169 peter@eisentraut.org 3658 : 20 : List *part_rels = NIL;
2880 tgl@sss.pgh.pa.us 3659 : 20 : List *relids = NIL;
3660 : 20 : List *relids_logged = NIL;
3661 : : ListCell *lc;
1759 3662 : 20 : LOCKMODE lockmode = AccessExclusiveLock;
3663 : :
3664 : : /*
3665 : : * Quick return if we are skipping data modification changes or handling
3666 : : * streamed transactions.
3667 : : */
1454 akapila@postgresql.o 3668 [ + - - + ]: 40 : if (is_skipping_changes() ||
3669 : 20 : handle_streamed_transaction(LOGICAL_REP_MSG_TRUNCATE, s))
2019 akapila@postgresql.o 3670 :UBC 0 : return;
3671 : :
1739 tgl@sss.pgh.pa.us 3672 :CBC 20 : begin_replication_step();
3673 : :
2899 peter_e@gmx.net 3674 : 20 : remote_relids = logicalrep_read_truncate(s, &cascade, &restart_seqs);
3675 : :
3676 [ + - + + : 49 : foreach(lc, remote_relids)
+ + ]
3677 : : {
3678 : 29 : LogicalRepRelId relid = lfirst_oid(lc);
3679 : : LogicalRepRelMapEntry *rel;
3680 : :
1759 akapila@postgresql.o 3681 : 29 : rel = logicalrep_rel_open(relid, lockmode);
2899 peter_e@gmx.net 3682 [ - + ]: 29 : if (!should_apply_changes_for_rel(rel))
3683 : : {
3684 : : /*
3685 : : * The relation can't become interesting in the middle of the
3686 : : * transaction so it's safe to unlock it.
3687 : : */
1759 akapila@postgresql.o 3688 :UBC 0 : logicalrep_rel_close(rel, lockmode);
2899 peter_e@gmx.net 3689 : 0 : continue;
3690 : : }
3691 : :
2899 peter_e@gmx.net 3692 :CBC 29 : remote_rels = lappend(remote_rels, rel);
1528 jdavis@postgresql.or 3693 : 29 : TargetPrivilegesCheck(rel->localrel, ACL_TRUNCATE);
2899 peter_e@gmx.net 3694 : 29 : rels = lappend(rels, rel->localrel);
3695 : 29 : relids = lappend_oid(relids, rel->localreloid);
3696 [ + + - + : 29 : if (RelationIsLogicallyLogged(rel->localrel))
+ - - + -
- - - + -
+ - ]
2883 peter_e@gmx.net 3697 :GBC 1 : relids_logged = lappend_oid(relids_logged, rel->localreloid);
3698 : :
3699 : : /*
3700 : : * Truncate partitions if we got a message to truncate a partitioned
3701 : : * table.
3702 : : */
2169 peter@eisentraut.org 3703 [ + + ]:CBC 29 : if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
3704 : : {
3705 : : ListCell *child;
3706 : 4 : List *children = find_all_inheritors(rel->localreloid,
3707 : : lockmode,
3708 : : NULL);
3709 : :
3710 [ + - + + : 15 : foreach(child, children)
+ + ]
3711 : : {
3712 : 11 : Oid childrelid = lfirst_oid(child);
3713 : : Relation childrel;
3714 : :
3715 [ + + ]: 11 : if (list_member_oid(relids, childrelid))
3716 : 4 : continue;
3717 : :
3718 : : /* find_all_inheritors already got lock */
3719 : 7 : childrel = table_open(childrelid, NoLock);
3720 : :
3721 : : /*
3722 : : * Ignore temp tables of other backends. See similar code in
3723 : : * ExecuteTruncate().
3724 : : */
3725 [ - + - - ]: 7 : if (RELATION_IS_OTHER_TEMP(childrel))
3726 : : {
1759 akapila@postgresql.o 3727 :UBC 0 : table_close(childrel, lockmode);
2169 peter@eisentraut.org 3728 : 0 : continue;
3729 : : }
3730 : :
1528 jdavis@postgresql.or 3731 :CBC 7 : TargetPrivilegesCheck(childrel, ACL_TRUNCATE);
2169 peter@eisentraut.org 3732 : 7 : rels = lappend(rels, childrel);
3733 : 7 : part_rels = lappend(part_rels, childrel);
3734 : 7 : relids = lappend_oid(relids, childrelid);
3735 : : /* Log this relation only if needed for logical decoding */
3736 [ + - - + : 7 : if (RelationIsLogicallyLogged(childrel))
- - - - -
- - - - -
- - ]
2169 peter@eisentraut.org 3737 :UBC 0 : relids_logged = lappend_oid(relids_logged, childrelid);
3738 : : }
3739 : : }
3740 : : }
3741 : :
3742 : : /*
3743 : : * Even if we used CASCADE on the upstream primary we explicitly default
3744 : : * to replaying changes without further cascading. This might be later
3745 : : * changeable with a user specified option.
3746 : : *
3747 : : * MySubscription->runasowner tells us whether we want to execute
3748 : : * replication actions as the subscription owner; the last argument to
3749 : : * TruncateGuts tells it whether we want to switch to the table owner.
3750 : : * Those are exactly opposite conditions.
3751 : : */
1802 fujii@postgresql.org 3752 :CBC 20 : ExecuteTruncateGuts(rels,
3753 : : relids,
3754 : : relids_logged,
3755 : : DROP_RESTRICT,
3756 : : restart_seqs,
1076 rhaas@postgresql.org 3757 : 20 : !MySubscription->runasowner);
2899 peter_e@gmx.net 3758 [ + - + + : 49 : foreach(lc, remote_rels)
+ + ]
3759 : : {
3760 : 29 : LogicalRepRelMapEntry *rel = lfirst(lc);
3761 : :
3762 : 29 : logicalrep_rel_close(rel, NoLock);
3763 : : }
2169 peter@eisentraut.org 3764 [ + + + + : 27 : foreach(lc, part_rels)
+ + ]
3765 : : {
3766 : 7 : Relation rel = lfirst(lc);
3767 : :
3768 : 7 : table_close(rel, NoLock);
3769 : : }
3770 : :
1739 tgl@sss.pgh.pa.us 3771 : 20 : end_replication_step();
3772 : : }
3773 : :
3774 : :
3775 : : /*
3776 : : * Logical replication protocol message dispatcher.
3777 : : */
3778 : : void
3342 peter_e@gmx.net 3779 : 337522 : apply_dispatch(StringInfo s)
3780 : : {
1959 akapila@postgresql.o 3781 : 337522 : LogicalRepMsgType action = pq_getmsgbyte(s);
3782 : : LogicalRepMsgType saved_command;
3783 : :
3784 : : /*
3785 : : * Set the current command being applied. Since this function can be
3786 : : * called recursively when applying spooled changes, save the current
3787 : : * command.
3788 : : */
1661 3789 : 337522 : saved_command = apply_error_callback_arg.command;
3790 : 337522 : apply_error_callback_arg.command = action;
3791 : :
3342 peter_e@gmx.net 3792 [ + + + + : 337522 : switch (action)
+ + + + +
- + + + +
+ + + + +
- ]
3793 : : {
1959 akapila@postgresql.o 3794 : 498 : case LOGICAL_REP_MSG_BEGIN:
3342 peter_e@gmx.net 3795 : 498 : apply_handle_begin(s);
1661 akapila@postgresql.o 3796 : 498 : break;
3797 : :
1959 3798 : 442 : case LOGICAL_REP_MSG_COMMIT:
3342 peter_e@gmx.net 3799 : 442 : apply_handle_commit(s);
1661 akapila@postgresql.o 3800 : 442 : break;
3801 : :
1959 3802 : 186090 : case LOGICAL_REP_MSG_INSERT:
3342 peter_e@gmx.net 3803 : 186090 : apply_handle_insert(s);
1661 akapila@postgresql.o 3804 : 186042 : break;
3805 : :
1959 3806 : 66166 : case LOGICAL_REP_MSG_UPDATE:
3342 peter_e@gmx.net 3807 : 66166 : apply_handle_update(s);
1661 akapila@postgresql.o 3808 : 66156 : break;
3809 : :
1959 3810 : 81936 : case LOGICAL_REP_MSG_DELETE:
3342 peter_e@gmx.net 3811 : 81936 : apply_handle_delete(s);
1661 akapila@postgresql.o 3812 : 81936 : break;
3813 : :
1959 3814 : 20 : case LOGICAL_REP_MSG_TRUNCATE:
2899 peter_e@gmx.net 3815 : 20 : apply_handle_truncate(s);
1661 akapila@postgresql.o 3816 : 20 : break;
3817 : :
1959 3818 : 485 : case LOGICAL_REP_MSG_RELATION:
3342 peter_e@gmx.net 3819 : 485 : apply_handle_relation(s);
1661 akapila@postgresql.o 3820 : 485 : break;
3821 : :
1959 3822 : 18 : case LOGICAL_REP_MSG_TYPE:
3342 peter_e@gmx.net 3823 : 18 : apply_handle_type(s);
1661 akapila@postgresql.o 3824 : 18 : break;
3825 : :
1959 3826 : 8 : case LOGICAL_REP_MSG_ORIGIN:
3342 peter_e@gmx.net 3827 : 8 : apply_handle_origin(s);
1661 akapila@postgresql.o 3828 : 8 : break;
3829 : :
1804 akapila@postgresql.o 3830 :UBC 0 : case LOGICAL_REP_MSG_MESSAGE:
3831 : :
3832 : : /*
3833 : : * Logical replication does not use generic logical messages yet.
3834 : : * Although, it could be used by other applications that use this
3835 : : * output plugin.
3836 : : */
1661 3837 : 0 : break;
3838 : :
1959 akapila@postgresql.o 3839 :CBC 843 : case LOGICAL_REP_MSG_STREAM_START:
2019 3840 : 843 : apply_handle_stream_start(s);
1661 3841 : 843 : break;
3842 : :
1669 3843 : 842 : case LOGICAL_REP_MSG_STREAM_STOP:
2019 3844 : 842 : apply_handle_stream_stop(s);
1661 3845 : 840 : break;
3846 : :
1959 3847 : 38 : case LOGICAL_REP_MSG_STREAM_ABORT:
2019 3848 : 38 : apply_handle_stream_abort(s);
1661 3849 : 38 : break;
3850 : :
1959 3851 : 61 : case LOGICAL_REP_MSG_STREAM_COMMIT:
2019 3852 : 61 : apply_handle_stream_commit(s);
1661 3853 : 59 : break;
3854 : :
1705 3855 : 17 : case LOGICAL_REP_MSG_BEGIN_PREPARE:
3856 : 17 : apply_handle_begin_prepare(s);
1661 3857 : 17 : break;
3858 : :
1705 3859 : 16 : case LOGICAL_REP_MSG_PREPARE:
3860 : 16 : apply_handle_prepare(s);
1661 3861 : 15 : break;
3862 : :
1705 3863 : 22 : case LOGICAL_REP_MSG_COMMIT_PREPARED:
3864 : 22 : apply_handle_commit_prepared(s);
1661 3865 : 22 : break;
3866 : :
1705 3867 : 5 : case LOGICAL_REP_MSG_ROLLBACK_PREPARED:
3868 : 5 : apply_handle_rollback_prepared(s);
1661 3869 : 5 : break;
3870 : :
1684 3871 : 15 : case LOGICAL_REP_MSG_STREAM_PREPARE:
3872 : 15 : apply_handle_stream_prepare(s);
1661 3873 : 13 : break;
3874 : :
1661 akapila@postgresql.o 3875 :UBC 0 : default:
3876 [ # # ]: 0 : ereport(ERROR,
3877 : : (errcode(ERRCODE_PROTOCOL_VIOLATION),
3878 : : errmsg("invalid logical replication message type \"??? (%d)\"", action)));
3879 : : }
3880 : :
3881 : : /* Reset the current command */
1661 akapila@postgresql.o 3882 :CBC 337457 : apply_error_callback_arg.command = saved_command;
3342 peter_e@gmx.net 3883 : 337457 : }
3884 : :
3885 : : /*
3886 : : * Figure out which write/flush positions to report to the walsender process.
3887 : : *
3888 : : * We can't simply report back the last LSN the walsender sent us because the
3889 : : * local transaction might not yet be flushed to disk locally. Instead we
3890 : : * build a list that associates local with remote LSNs for every commit. When
3891 : : * reporting back the flush position to the sender we iterate that list and
3892 : : * check which entries on it are already locally flushed. Those we can report
3893 : : * as having been flushed.
3894 : : *
3895 : : * The have_pending_txes is true if there are outstanding transactions that
3896 : : * need to be flushed.
3897 : : */
3898 : : static void
3899 : 23415 : get_flush_position(XLogRecPtr *write, XLogRecPtr *flush,
3900 : : bool *have_pending_txes)
3901 : : {
3902 : : dlist_mutable_iter iter;
1591 rhaas@postgresql.org 3903 : 23415 : XLogRecPtr local_flush = GetFlushRecPtr(NULL);
3904 : :
3342 peter_e@gmx.net 3905 : 23415 : *write = InvalidXLogRecPtr;
3906 : 23415 : *flush = InvalidXLogRecPtr;
3907 : :
3908 [ + - + + ]: 23937 : dlist_foreach_modify(iter, &lsn_mapping)
3909 : : {
3910 : 4770 : FlushPosition *pos =
1031 tgl@sss.pgh.pa.us 3911 :ECB (4140) : dlist_container(FlushPosition, node, iter.cur);
3912 : :
3342 peter_e@gmx.net 3913 :CBC 4770 : *write = pos->remote_end;
3914 : :
3915 [ + + ]: 4770 : if (pos->local_end <= local_flush)
3916 : : {
3917 : 522 : *flush = pos->remote_end;
3918 : 522 : dlist_delete(iter.cur);
3919 : 522 : pfree(pos);
3920 : : }
3921 : : else
3922 : : {
3923 : : /*
3924 : : * Don't want to uselessly iterate over the rest of the list which
3925 : : * could potentially be long. Instead get the last element and
3926 : : * grab the write position from there.
3927 : : */
3928 : 4248 : pos = dlist_tail_element(FlushPosition, node,
3929 : : &lsn_mapping);
3930 : 4248 : *write = pos->remote_end;
3931 : 4248 : *have_pending_txes = true;
3932 : 4248 : return;
3933 : : }
3934 : : }
3935 : :
3936 : 19167 : *have_pending_txes = !dlist_is_empty(&lsn_mapping);
3937 : : }
3938 : :
3939 : : /*
3940 : : * Store current remote/local lsn pair in the tracking list.
3941 : : */
3942 : : void
1161 akapila@postgresql.o 3943 : 552 : store_flush_position(XLogRecPtr remote_lsn, XLogRecPtr local_lsn)
3944 : : {
3945 : : FlushPosition *flushpos;
3946 : :
3947 : : /*
3948 : : * Skip for parallel apply workers, because the lsn_mapping is maintained
3949 : : * by the leader apply worker.
3950 : : */
3951 [ + + ]: 552 : if (am_parallel_apply_worker())
3952 : 19 : return;
3953 : :
3954 : : /* Need to do this in permanent context */
3232 peter_e@gmx.net 3955 : 533 : MemoryContextSwitchTo(ApplyContext);
3956 : :
3957 : : /* Track commit lsn */
95 michael@paquier.xyz 3958 :GNC 533 : flushpos = palloc_object(FlushPosition);
1161 akapila@postgresql.o 3959 :CBC 533 : flushpos->local_end = local_lsn;
3342 peter_e@gmx.net 3960 : 533 : flushpos->remote_end = remote_lsn;
3961 : :
3962 : 533 : dlist_push_tail(&lsn_mapping, &flushpos->node);
3232 3963 : 533 : MemoryContextSwitchTo(ApplyMessageContext);
3964 : : }
3965 : :
3966 : :
3967 : : /* Update statistics of the worker. */
3968 : : static void
3342 3969 : 190688 : UpdateWorkerStats(XLogRecPtr last_lsn, TimestampTz send_time, bool reply)
3970 : : {
3971 : 190688 : MyLogicalRepWorker->last_lsn = last_lsn;
3972 : 190688 : MyLogicalRepWorker->last_send_time = send_time;
3973 : 190688 : MyLogicalRepWorker->last_recv_time = GetCurrentTimestamp();
3974 [ + + ]: 190688 : if (reply)
3975 : : {
3976 : 2981 : MyLogicalRepWorker->reply_lsn = last_lsn;
3977 : 2981 : MyLogicalRepWorker->reply_time = send_time;
3978 : : }
3979 : 190688 : }
3980 : :
3981 : : /*
3982 : : * Apply main loop.
3983 : : */
3984 : : static void
3279 3985 : 434 : LogicalRepApplyLoop(XLogRecPtr last_received)
3986 : : {
2340 michael@paquier.xyz 3987 : 434 : TimestampTz last_recv_timestamp = GetCurrentTimestamp();
2018 tgl@sss.pgh.pa.us 3988 : 434 : bool ping_sent = false;
3989 : : TimeLineID tli;
3990 : : ErrorContextCallback errcallback;
235 akapila@postgresql.o 3991 :GNC 434 : RetainDeadTuplesData rdt_data = {0};
3992 : :
3993 : : /*
3994 : : * Init the ApplyMessageContext which we clean up after each replication
3995 : : * protocol message.
3996 : : */
3232 peter_e@gmx.net 3997 :CBC 434 : ApplyMessageContext = AllocSetContextCreate(ApplyContext,
3998 : : "ApplyMessageContext",
3999 : : ALLOCSET_DEFAULT_SIZES);
4000 : :
4001 : : /*
4002 : : * This memory context is used for per-stream data when the streaming mode
4003 : : * is enabled. This context is reset on each stream stop.
4004 : : */
2019 akapila@postgresql.o 4005 : 434 : LogicalStreamingContext = AllocSetContextCreate(ApplyContext,
4006 : : "LogicalStreamingContext",
4007 : : ALLOCSET_DEFAULT_SIZES);
4008 : :
4009 : : /* mark as idle, before starting to loop */
3342 peter_e@gmx.net 4010 : 434 : pgstat_report_activity(STATE_IDLE, NULL);
4011 : :
4012 : : /*
4013 : : * Push apply error context callback. Fields will be filled while applying
4014 : : * a change.
4015 : : */
1661 akapila@postgresql.o 4016 : 434 : errcallback.callback = apply_error_callback;
4017 : 434 : errcallback.previous = error_context_stack;
4018 : 434 : error_context_stack = &errcallback;
1161 4019 : 434 : apply_error_context_stack = error_context_stack;
4020 : :
4021 : : /* This outer loop iterates once per wait. */
4022 : : for (;;)
3342 peter_e@gmx.net 4023 : 19836 : {
4024 : 20270 : pgsocket fd = PGINVALID_SOCKET;
4025 : : int rc;
4026 : : int len;
4027 : 20270 : char *buf = NULL;
4028 : 20270 : bool endofstream = false;
4029 : : long wait_time;
4030 : :
3208 4031 [ - + ]: 20270 : CHECK_FOR_INTERRUPTS();
4032 : :
3232 4033 : 20270 : MemoryContextSwitchTo(ApplyMessageContext);
4034 : :
1768 alvherre@alvh.no-ip. 4035 : 20270 : len = walrcv_receive(LogRepWorkerWalRcvConn, &buf, &fd);
4036 : :
3342 peter_e@gmx.net 4037 [ + + ]: 20251 : if (len != 0)
4038 : : {
4039 : : /* Loop to process all available data (without blocking). */
4040 : : for (;;)
4041 : : {
4042 [ - + ]: 209852 : CHECK_FOR_INTERRUPTS();
4043 : :
4044 [ + + ]: 209852 : if (len == 0)
4045 : : {
4046 : 19154 : break;
4047 : : }
4048 [ + + ]: 190698 : else if (len < 0)
4049 : : {
4050 [ + - ]: 10 : ereport(LOG,
4051 : : (errmsg("data stream from publisher has ended")));
4052 : 10 : endofstream = true;
4053 : 10 : break;
4054 : : }
4055 : : else
4056 : : {
4057 : : int c;
4058 : : StringInfoData s;
4059 : :
1012 akapila@postgresql.o 4060 [ + + ]: 190688 : if (ConfigReloadPending)
4061 : : {
1012 akapila@postgresql.o 4062 :GBC 1 : ConfigReloadPending = false;
4063 : 1 : ProcessConfigFile(PGC_SIGHUP);
4064 : : }
4065 : :
4066 : : /* Reset timeout. */
3342 peter_e@gmx.net 4067 :CBC 190688 : last_recv_timestamp = GetCurrentTimestamp();
4068 : 190688 : ping_sent = false;
4069 : :
235 akapila@postgresql.o 4070 :GNC 190688 : rdt_data.last_recv_time = last_recv_timestamp;
4071 : :
4072 : : /* Ensure we are reading the data into our memory context. */
3232 peter_e@gmx.net 4073 :CBC 190688 : MemoryContextSwitchTo(ApplyMessageContext);
4074 : :
871 drowley@postgresql.o 4075 : 190688 : initReadOnlyStringInfo(&s, buf, len);
4076 : :
3342 peter_e@gmx.net 4077 : 190688 : c = pq_getmsgbyte(&s);
4078 : :
221 nathan@postgresql.or 4079 [ + + ]:GNC 190688 : if (c == PqReplMsg_WALData)
4080 : : {
4081 : : XLogRecPtr start_lsn;
4082 : : XLogRecPtr end_lsn;
4083 : : TimestampTz send_time;
4084 : :
3342 peter_e@gmx.net 4085 :CBC 185012 : start_lsn = pq_getmsgint64(&s);
4086 : 185012 : end_lsn = pq_getmsgint64(&s);
3307 tgl@sss.pgh.pa.us 4087 : 185012 : send_time = pq_getmsgint64(&s);
4088 : :
3342 peter_e@gmx.net 4089 [ + + ]: 185012 : if (last_received < start_lsn)
4090 : 141444 : last_received = start_lsn;
4091 : :
4092 [ - + ]: 185012 : if (last_received < end_lsn)
3342 peter_e@gmx.net 4093 :UBC 0 : last_received = end_lsn;
4094 : :
3342 peter_e@gmx.net 4095 :CBC 185012 : UpdateWorkerStats(last_received, send_time, false);
4096 : :
4097 : 185012 : apply_dispatch(&s);
4098 : :
235 akapila@postgresql.o 4099 :GNC 184951 : maybe_advance_nonremovable_xid(&rdt_data, false);
4100 : : }
221 nathan@postgresql.or 4101 [ + + ]: 5676 : else if (c == PqReplMsg_Keepalive)
4102 : : {
4103 : : XLogRecPtr end_lsn;
4104 : : TimestampTz timestamp;
4105 : : bool reply_requested;
4106 : :
3279 peter_e@gmx.net 4107 :CBC 2981 : end_lsn = pq_getmsgint64(&s);
3307 tgl@sss.pgh.pa.us 4108 : 2981 : timestamp = pq_getmsgint64(&s);
3342 peter_e@gmx.net 4109 : 2981 : reply_requested = pq_getmsgbyte(&s);
4110 : :
3279 4111 [ + + ]: 2981 : if (last_received < end_lsn)
4112 : 1058 : last_received = end_lsn;
4113 : :
4114 : 2981 : send_feedback(last_received, reply_requested, false);
4115 : :
235 akapila@postgresql.o 4116 :GNC 2981 : maybe_advance_nonremovable_xid(&rdt_data, false);
4117 : :
3342 peter_e@gmx.net 4118 :CBC 2981 : UpdateWorkerStats(last_received, timestamp, true);
4119 : : }
221 nathan@postgresql.or 4120 [ + - ]:GNC 2695 : else if (c == PqReplMsg_PrimaryStatusUpdate)
4121 : : {
235 akapila@postgresql.o 4122 : 2695 : rdt_data.remote_lsn = pq_getmsgint64(&s);
4123 : 2695 : rdt_data.remote_oldestxid = FullTransactionIdFromU64((uint64) pq_getmsgint64(&s));
4124 : 2695 : rdt_data.remote_nextxid = FullTransactionIdFromU64((uint64) pq_getmsgint64(&s));
4125 : 2695 : rdt_data.reply_time = pq_getmsgint64(&s);
4126 : :
4127 : : /*
4128 : : * This should never happen, see
4129 : : * ProcessStandbyPSRequestMessage. But if it happens
4130 : : * due to a bug, we don't want to proceed as it can
4131 : : * incorrectly advance oldest_nonremovable_xid.
4132 : : */
129 alvherre@kurilemu.de 4133 [ - + ]: 2695 : if (!XLogRecPtrIsValid(rdt_data.remote_lsn))
235 akapila@postgresql.o 4134 [ # # ]:UNC 0 : elog(ERROR, "cannot get the latest WAL position from the publisher");
4135 : :
235 akapila@postgresql.o 4136 :GNC 2695 : maybe_advance_nonremovable_xid(&rdt_data, true);
4137 : :
4138 : 2695 : UpdateWorkerStats(last_received, rdt_data.reply_time, false);
4139 : : }
4140 : : /* other message types are purposefully ignored */
4141 : :
3232 peter_e@gmx.net 4142 :CBC 190627 : MemoryContextReset(ApplyMessageContext);
4143 : : }
4144 : :
1768 alvherre@alvh.no-ip. 4145 : 190627 : len = walrcv_receive(LogRepWorkerWalRcvConn, &buf, &fd);
4146 : : }
4147 : : }
4148 : :
4149 : : /* confirm all writes so far */
3179 tgl@sss.pgh.pa.us 4150 : 20190 : send_feedback(last_received, false, false);
4151 : :
4152 : : /* Reset the timestamp if no message was received */
235 akapila@postgresql.o 4153 :GNC 20190 : rdt_data.last_recv_time = 0;
4154 : :
4155 : 20190 : maybe_advance_nonremovable_xid(&rdt_data, false);
4156 : :
2019 akapila@postgresql.o 4157 [ + + + + ]:CBC 20189 : if (!in_remote_transaction && !in_streamed_transaction)
4158 : : {
4159 : : /*
4160 : : * If we didn't get any transactions for a while there might be
4161 : : * unconsumed invalidation messages in the queue, consume them
4162 : : * now.
4163 : : */
3279 peter_e@gmx.net 4164 : 5134 : AcceptInvalidationMessages();
3207 4165 : 5134 : maybe_reread_subscription();
4166 : :
4167 : : /*
4168 : : * Process any relations that are being synchronized in parallel
4169 : : * and any newly added tables or sequences.
4170 : : */
150 akapila@postgresql.o 4171 :GNC 5092 : ProcessSyncingRelations(last_received);
4172 : : }
4173 : :
4174 : : /* Cleanup the memory. */
851 nathan@postgresql.or 4175 :CBC 19947 : MemoryContextReset(ApplyMessageContext);
3342 peter_e@gmx.net 4176 : 19947 : MemoryContextSwitchTo(TopMemoryContext);
4177 : :
4178 : : /* Check if we need to exit the streaming loop. */
4179 [ + + ]: 19947 : if (endofstream)
4180 : 10 : break;
4181 : :
4182 : : /*
4183 : : * Wait for more data or latch. If we have unflushed transactions,
4184 : : * wake up after WalWriterDelay to see if they've been flushed yet (in
4185 : : * which case we should send a feedback message). Otherwise, there's
4186 : : * no particular urgency about waking up unless we get data or a
4187 : : * signal.
4188 : : */
3179 tgl@sss.pgh.pa.us 4189 [ + + ]: 19937 : if (!dlist_is_empty(&lsn_mapping))
4190 : 2684 : wait_time = WalWriterDelay;
4191 : : else
4192 : 17253 : wait_time = NAPTIME_PER_CYCLE;
4193 : :
4194 : : /*
4195 : : * Ensure to wake up when it's possible to advance the non-removable
4196 : : * transaction ID, or when the retention duration may have exceeded
4197 : : * max_retention_duration.
4198 : : */
194 akapila@postgresql.o 4199 [ + + ]:GNC 19937 : if (MySubscription->retentionactive)
4200 : : {
4201 [ + + ]: 1304 : if (rdt_data.phase == RDT_GET_CANDIDATE_XID &&
4202 [ - + ]: 59 : rdt_data.xid_advance_interval)
194 akapila@postgresql.o 4203 :UNC 0 : wait_time = Min(wait_time, rdt_data.xid_advance_interval);
194 akapila@postgresql.o 4204 [ + + ]:GNC 1304 : else if (MySubscription->maxretention > 0)
4205 : 1 : wait_time = Min(wait_time, MySubscription->maxretention);
4206 : : }
4207 : :
3204 andres@anarazel.de 4208 :CBC 19937 : rc = WaitLatchOrSocket(MyLatch,
4209 : : WL_SOCKET_READABLE | WL_LATCH_SET |
4210 : : WL_TIMEOUT | WL_EXIT_ON_PM_DEATH,
4211 : : fd, wait_time,
4212 : : WAIT_EVENT_LOGICAL_APPLY_MAIN);
4213 : :
4214 [ + + ]: 19937 : if (rc & WL_LATCH_SET)
4215 : : {
4216 : 773 : ResetLatch(MyLatch);
4217 [ + + ]: 773 : CHECK_FOR_INTERRUPTS();
4218 : : }
4219 : :
2280 rhaas@postgresql.org 4220 [ + + ]: 19836 : if (ConfigReloadPending)
4221 : : {
4222 : 10 : ConfigReloadPending = false;
3261 peter_e@gmx.net 4223 : 10 : ProcessConfigFile(PGC_SIGHUP);
4224 : : }
4225 : :
3342 4226 [ + + ]: 19836 : if (rc & WL_TIMEOUT)
4227 : : {
4228 : : /*
4229 : : * We didn't receive anything new. If we haven't heard anything
4230 : : * from the server for more than wal_receiver_timeout / 2, ping
4231 : : * the server. Also, if it's been longer than
4232 : : * wal_receiver_status_interval since the last update we sent,
4233 : : * send a status update to the primary anyway, to report any
4234 : : * progress in applying WAL.
4235 : : */
4236 : 230 : bool requestReply = false;
4237 : :
4238 : : /*
4239 : : * Check if time since last receive from primary has reached the
4240 : : * configured limit.
4241 : : */
4242 [ + - ]: 230 : if (wal_receiver_timeout > 0)
4243 : : {
4244 : 230 : TimestampTz now = GetCurrentTimestamp();
4245 : : TimestampTz timeout;
4246 : :
4247 : 230 : timeout =
4248 : 230 : TimestampTzPlusMilliseconds(last_recv_timestamp,
4249 : : wal_receiver_timeout);
4250 : :
4251 [ - + ]: 230 : if (now >= timeout)
3342 peter_e@gmx.net 4252 [ # # ]:UBC 0 : ereport(ERROR,
4253 : : (errcode(ERRCODE_CONNECTION_FAILURE),
4254 : : errmsg("terminating logical replication worker due to timeout")));
4255 : :
4256 : : /* Check to see if it's time for a ping. */
3342 peter_e@gmx.net 4257 [ + - ]:CBC 230 : if (!ping_sent)
4258 : : {
4259 : 230 : timeout = TimestampTzPlusMilliseconds(last_recv_timestamp,
4260 : : (wal_receiver_timeout / 2));
4261 [ - + ]: 230 : if (now >= timeout)
4262 : : {
3342 peter_e@gmx.net 4263 :UBC 0 : requestReply = true;
4264 : 0 : ping_sent = true;
4265 : : }
4266 : : }
4267 : : }
4268 : :
3342 peter_e@gmx.net 4269 :CBC 230 : send_feedback(last_received, requestReply, requestReply);
4270 : :
235 akapila@postgresql.o 4271 :GNC 230 : maybe_advance_nonremovable_xid(&rdt_data, false);
4272 : :
4273 : : /*
4274 : : * Force reporting to ensure long idle periods don't lead to
4275 : : * arbitrarily delayed stats. Stats can only be reported outside
4276 : : * of (implicit or explicit) transactions. That shouldn't lead to
4277 : : * stats being delayed for long, because transactions are either
4278 : : * sent as a whole on commit or streamed. Streamed transactions
4279 : : * are spilled to disk and applied on commit.
4280 : : */
1403 andres@anarazel.de 4281 [ + - ]:CBC 230 : if (!IsTransactionState())
4282 : 230 : pgstat_report_stat(true);
4283 : : }
4284 : : }
4285 : :
4286 : : /* Pop the error context stack */
1661 akapila@postgresql.o 4287 : 10 : error_context_stack = errcallback.previous;
1161 4288 : 10 : apply_error_context_stack = error_context_stack;
4289 : :
4290 : : /* All done */
1768 alvherre@alvh.no-ip. 4291 : 10 : walrcv_endstreaming(LogRepWorkerWalRcvConn, &tli);
3342 peter_e@gmx.net 4292 :UBC 0 : }
4293 : :
4294 : : /*
4295 : : * Send a Standby Status Update message to server.
4296 : : *
4297 : : * 'recvpos' is the latest LSN we've received data to, force is set if we need
4298 : : * to send a response to avoid timeouts.
4299 : : */
4300 : : static void
3342 peter_e@gmx.net 4301 :CBC 23401 : send_feedback(XLogRecPtr recvpos, bool force, bool requestReply)
4302 : : {
4303 : : static StringInfo reply_message = NULL;
4304 : : static TimestampTz send_time = 0;
4305 : :
4306 : : static XLogRecPtr last_recvpos = InvalidXLogRecPtr;
4307 : : static XLogRecPtr last_writepos = InvalidXLogRecPtr;
4308 : :
4309 : : XLogRecPtr writepos;
4310 : : XLogRecPtr flushpos;
4311 : : TimestampTz now;
4312 : : bool have_pending_txes;
4313 : :
4314 : : /*
4315 : : * If the user doesn't want status to be reported to the publisher, be
4316 : : * sure to exit before doing anything at all.
4317 : : */
4318 [ + + - + ]: 23401 : if (!force && wal_receiver_status_interval <= 0)
4319 : 9452 : return;
4320 : :
4321 : : /* It's legal to not pass a recvpos */
4322 [ - + ]: 23401 : if (recvpos < last_recvpos)
3342 peter_e@gmx.net 4323 :UBC 0 : recvpos = last_recvpos;
4324 : :
3342 peter_e@gmx.net 4325 :CBC 23401 : get_flush_position(&writepos, &flushpos, &have_pending_txes);
4326 : :
4327 : : /*
4328 : : * No outstanding transactions to flush, we can report the latest received
4329 : : * position. This is important for synchronous replication.
4330 : : */
4331 [ + + ]: 23401 : if (!have_pending_txes)
4332 : 19158 : flushpos = writepos = recvpos;
4333 : :
4334 [ - + ]: 23401 : if (writepos < last_writepos)
3342 peter_e@gmx.net 4335 :UBC 0 : writepos = last_writepos;
4336 : :
3342 peter_e@gmx.net 4337 [ + + ]:CBC 23401 : if (flushpos < last_flushpos)
4338 : 4197 : flushpos = last_flushpos;
4339 : :
4340 : 23401 : now = GetCurrentTimestamp();
4341 : :
4342 : : /* if we've already reported everything we're good */
4343 [ + + ]: 23401 : if (!force &&
4344 [ + + ]: 22328 : writepos == last_writepos &&
4345 [ + + ]: 9723 : flushpos == last_flushpos &&
4346 [ + + ]: 9535 : !TimestampDifferenceExceeds(send_time, now,
4347 : : wal_receiver_status_interval * 1000))
4348 : 9452 : return;
4349 : 13949 : send_time = now;
4350 : :
4351 [ + + ]: 13949 : if (!reply_message)
4352 : : {
3224 bruce@momjian.us 4353 : 434 : MemoryContext oldctx = MemoryContextSwitchTo(ApplyContext);
4354 : :
3342 peter_e@gmx.net 4355 : 434 : reply_message = makeStringInfo();
4356 : 434 : MemoryContextSwitchTo(oldctx);
4357 : : }
4358 : : else
4359 : 13515 : resetStringInfo(reply_message);
4360 : :
221 nathan@postgresql.or 4361 :GNC 13949 : pq_sendbyte(reply_message, PqReplMsg_StandbyStatusUpdate);
3189 tgl@sss.pgh.pa.us 4362 :CBC 13949 : pq_sendint64(reply_message, recvpos); /* write */
4363 : 13949 : pq_sendint64(reply_message, flushpos); /* flush */
4364 : 13949 : pq_sendint64(reply_message, writepos); /* apply */
3224 bruce@momjian.us 4365 : 13949 : pq_sendint64(reply_message, now); /* sendTime */
3342 peter_e@gmx.net 4366 : 13949 : pq_sendbyte(reply_message, requestReply); /* replyRequested */
4367 : :
251 alvherre@kurilemu.de 4368 [ + + ]:GNC 13949 : elog(DEBUG2, "sending feedback (force %d) to recv %X/%08X, write %X/%08X, flush %X/%08X",
4369 : : force,
4370 : : LSN_FORMAT_ARGS(recvpos),
4371 : : LSN_FORMAT_ARGS(writepos),
4372 : : LSN_FORMAT_ARGS(flushpos));
4373 : :
1768 alvherre@alvh.no-ip. 4374 :CBC 13949 : walrcv_send(LogRepWorkerWalRcvConn,
4375 : : reply_message->data, reply_message->len);
4376 : :
3342 peter_e@gmx.net 4377 [ + + ]: 13949 : if (recvpos > last_recvpos)
4378 : 12607 : last_recvpos = recvpos;
4379 [ + + ]: 13949 : if (writepos > last_writepos)
4380 : 12610 : last_writepos = writepos;
4381 [ + + ]: 13949 : if (flushpos > last_flushpos)
4382 : 12421 : last_flushpos = flushpos;
4383 : : }
4384 : :
4385 : : /*
4386 : : * Attempt to advance the non-removable transaction ID.
4387 : : *
4388 : : * See comments atop worker.c for details.
4389 : : */
4390 : : static void
235 akapila@postgresql.o 4391 :GNC 211047 : maybe_advance_nonremovable_xid(RetainDeadTuplesData *rdt_data,
4392 : : bool status_received)
4393 : : {
4394 [ + + ]: 211047 : if (!can_advance_nonremovable_xid(rdt_data))
4395 : 206852 : return;
4396 : :
4397 : 4195 : process_rdt_phase_transition(rdt_data, status_received);
4398 : : }
4399 : :
4400 : : /*
4401 : : * Preliminary check to determine if advancing the non-removable transaction ID
4402 : : * is allowed.
4403 : : */
4404 : : static bool
4405 : 211047 : can_advance_nonremovable_xid(RetainDeadTuplesData *rdt_data)
4406 : : {
4407 : : /*
4408 : : * It is sufficient to manage non-removable transaction ID for a
4409 : : * subscription by the main apply worker to detect update_deleted reliably
4410 : : * even for table sync or parallel apply workers.
4411 : : */
4412 [ + + ]: 211047 : if (!am_leader_apply_worker())
4413 : 396 : return false;
4414 : :
4415 : : /* No need to advance if retaining dead tuples is not required */
4416 [ + + ]: 210651 : if (!MySubscription->retaindeadtuples)
4417 : 206456 : return false;
4418 : :
4419 : 4195 : return true;
4420 : : }
4421 : :
4422 : : /*
4423 : : * Process phase transitions during the non-removable transaction ID
4424 : : * advancement. See comments atop worker.c for details of the transition.
4425 : : */
4426 : : static void
4427 : 6972 : process_rdt_phase_transition(RetainDeadTuplesData *rdt_data,
4428 : : bool status_received)
4429 : : {
4430 [ + + + + : 6972 : switch (rdt_data->phase)
+ + - ]
4431 : : {
4432 : 171 : case RDT_GET_CANDIDATE_XID:
4433 : 171 : get_candidate_xid(rdt_data);
4434 : 171 : break;
4435 : 2701 : case RDT_REQUEST_PUBLISHER_STATUS:
4436 : 2701 : request_publisher_status(rdt_data);
4437 : 2701 : break;
4438 : 3981 : case RDT_WAIT_FOR_PUBLISHER_STATUS:
4439 : 3981 : wait_for_publisher_status(rdt_data, status_received);
4440 : 3981 : break;
4441 : 117 : case RDT_WAIT_FOR_LOCAL_FLUSH:
4442 : 117 : wait_for_local_flush(rdt_data);
4443 : 117 : break;
194 4444 : 1 : case RDT_STOP_CONFLICT_INFO_RETENTION:
4445 : 1 : stop_conflict_info_retention(rdt_data);
4446 : 1 : break;
181 4447 : 1 : case RDT_RESUME_CONFLICT_INFO_RETENTION:
4448 : 1 : resume_conflict_info_retention(rdt_data);
181 akapila@postgresql.o 4449 :UNC 0 : break;
4450 : : }
235 akapila@postgresql.o 4451 :GNC 6971 : }
4452 : :
4453 : : /*
4454 : : * Workhorse for the RDT_GET_CANDIDATE_XID phase.
4455 : : */
4456 : : static void
4457 : 171 : get_candidate_xid(RetainDeadTuplesData *rdt_data)
4458 : : {
4459 : : TransactionId oldest_running_xid;
4460 : : TimestampTz now;
4461 : :
4462 : : /*
4463 : : * Use last_recv_time when applying changes in the loop to avoid
4464 : : * unnecessary system time retrieval. If last_recv_time is not available,
4465 : : * obtain the current timestamp.
4466 : : */
4467 [ + + ]: 171 : now = rdt_data->last_recv_time ? rdt_data->last_recv_time : GetCurrentTimestamp();
4468 : :
4469 : : /*
4470 : : * Compute the candidate_xid and request the publisher status at most once
4471 : : * per xid_advance_interval. Refer to adjust_xid_advance_interval() for
4472 : : * details on how this value is dynamically adjusted. This is to avoid
4473 : : * using CPU and network resources without making much progress.
4474 : : */
4475 [ - + ]: 171 : if (!TimestampDifferenceExceeds(rdt_data->candidate_xid_time, now,
4476 : : rdt_data->xid_advance_interval))
235 akapila@postgresql.o 4477 :UNC 0 : return;
4478 : :
4479 : : /*
4480 : : * Immediately update the timer, even if the function returns later
4481 : : * without setting candidate_xid due to inactivity on the subscriber. This
4482 : : * avoids frequent calls to GetOldestActiveTransactionId.
4483 : : */
235 akapila@postgresql.o 4484 :GNC 171 : rdt_data->candidate_xid_time = now;
4485 : :
4486 : : /*
4487 : : * Consider transactions in the current database, as only dead tuples from
4488 : : * this database are required for conflict detection.
4489 : : */
4490 : 171 : oldest_running_xid = GetOldestActiveTransactionId(false, false);
4491 : :
4492 : : /*
4493 : : * Oldest active transaction ID (oldest_running_xid) can't be behind any
4494 : : * of its previously computed value.
4495 : : */
4496 [ - + ]: 171 : Assert(TransactionIdPrecedesOrEquals(MyLogicalRepWorker->oldest_nonremovable_xid,
4497 : : oldest_running_xid));
4498 : :
4499 : : /* Return if the oldest_nonremovable_xid cannot be advanced */
4500 [ + + ]: 171 : if (TransactionIdEquals(MyLogicalRepWorker->oldest_nonremovable_xid,
4501 : : oldest_running_xid))
4502 : : {
4503 : 126 : adjust_xid_advance_interval(rdt_data, false);
4504 : 126 : return;
4505 : : }
4506 : :
4507 : 45 : adjust_xid_advance_interval(rdt_data, true);
4508 : :
4509 : 45 : rdt_data->candidate_xid = oldest_running_xid;
4510 : 45 : rdt_data->phase = RDT_REQUEST_PUBLISHER_STATUS;
4511 : :
4512 : : /* process the next phase */
4513 : 45 : process_rdt_phase_transition(rdt_data, false);
4514 : : }
4515 : :
4516 : : /*
4517 : : * Workhorse for the RDT_REQUEST_PUBLISHER_STATUS phase.
4518 : : */
4519 : : static void
4520 : 2701 : request_publisher_status(RetainDeadTuplesData *rdt_data)
4521 : : {
4522 : : static StringInfo request_message = NULL;
4523 : :
4524 [ + + ]: 2701 : if (!request_message)
4525 : : {
4526 : 12 : MemoryContext oldctx = MemoryContextSwitchTo(ApplyContext);
4527 : :
4528 : 12 : request_message = makeStringInfo();
4529 : 12 : MemoryContextSwitchTo(oldctx);
4530 : : }
4531 : : else
4532 : 2689 : resetStringInfo(request_message);
4533 : :
4534 : : /*
4535 : : * Send the current time to update the remote walsender's latest reply
4536 : : * message received time.
4537 : : */
221 nathan@postgresql.or 4538 : 2701 : pq_sendbyte(request_message, PqReplMsg_PrimaryStatusRequest);
235 akapila@postgresql.o 4539 : 2701 : pq_sendint64(request_message, GetCurrentTimestamp());
4540 : :
4541 [ + + ]: 2701 : elog(DEBUG2, "sending publisher status request message");
4542 : :
4543 : : /* Send a request for the publisher status */
4544 : 2701 : walrcv_send(LogRepWorkerWalRcvConn,
4545 : : request_message->data, request_message->len);
4546 : :
4547 : 2701 : rdt_data->phase = RDT_WAIT_FOR_PUBLISHER_STATUS;
4548 : :
4549 : : /*
4550 : : * Skip calling maybe_advance_nonremovable_xid() since further transition
4551 : : * is possible only once we receive the publisher status message.
4552 : : */
4553 : 2701 : }
4554 : :
4555 : : /*
4556 : : * Workhorse for the RDT_WAIT_FOR_PUBLISHER_STATUS phase.
4557 : : */
4558 : : static void
4559 : 3981 : wait_for_publisher_status(RetainDeadTuplesData *rdt_data,
4560 : : bool status_received)
4561 : : {
4562 : : /*
4563 : : * Return if we have requested but not yet received the publisher status.
4564 : : */
4565 [ + + ]: 3981 : if (!status_received)
4566 : 1286 : return;
4567 : :
4568 : : /*
4569 : : * We don't need to maintain oldest_nonremovable_xid if we decide to stop
4570 : : * retaining conflict information for this worker.
4571 : : */
194 4572 [ - + ]: 2695 : if (should_stop_conflict_info_retention(rdt_data))
4573 : : {
181 akapila@postgresql.o 4574 :UNC 0 : rdt_data->phase = RDT_STOP_CONFLICT_INFO_RETENTION;
194 4575 : 0 : return;
4576 : : }
4577 : :
235 akapila@postgresql.o 4578 [ + + ]:GNC 2695 : if (!FullTransactionIdIsValid(rdt_data->remote_wait_for))
4579 : 39 : rdt_data->remote_wait_for = rdt_data->remote_nextxid;
4580 : :
4581 : : /*
4582 : : * Check if all remote concurrent transactions that were active at the
4583 : : * first status request have now completed. If completed, proceed to the
4584 : : * next phase; otherwise, continue checking the publisher status until
4585 : : * these transactions finish.
4586 : : *
4587 : : * It's possible that transactions in the commit phase during the last
4588 : : * cycle have now finished committing, but remote_oldestxid remains older
4589 : : * than remote_wait_for. This can happen if some old transaction came in
4590 : : * the commit phase when we requested status in this cycle. We do not
4591 : : * handle this case explicitly as it's rare and the benefit doesn't
4592 : : * justify the required complexity. Tracking would require either caching
4593 : : * all xids at the publisher or sending them to subscribers. The condition
4594 : : * will resolve naturally once the remaining transactions are finished.
4595 : : *
4596 : : * Directly advancing the non-removable transaction ID is possible if
4597 : : * there are no activities on the publisher since the last advancement
4598 : : * cycle. However, it requires maintaining two fields, last_remote_nextxid
4599 : : * and last_remote_lsn, within the structure for comparison with the
4600 : : * current cycle's values. Considering the minimal cost of continuing in
4601 : : * RDT_WAIT_FOR_LOCAL_FLUSH without awaiting changes, we opted not to
4602 : : * advance the transaction ID here.
4603 : : */
4604 [ + + ]: 2695 : if (FullTransactionIdPrecedesOrEquals(rdt_data->remote_wait_for,
4605 : : rdt_data->remote_oldestxid))
4606 : 39 : rdt_data->phase = RDT_WAIT_FOR_LOCAL_FLUSH;
4607 : : else
4608 : 2656 : rdt_data->phase = RDT_REQUEST_PUBLISHER_STATUS;
4609 : :
4610 : : /* process the next phase */
4611 : 2695 : process_rdt_phase_transition(rdt_data, false);
4612 : : }
4613 : :
4614 : : /*
4615 : : * Workhorse for the RDT_WAIT_FOR_LOCAL_FLUSH phase.
4616 : : */
4617 : : static void
4618 : 117 : wait_for_local_flush(RetainDeadTuplesData *rdt_data)
4619 : : {
129 alvherre@kurilemu.de 4620 [ + - - + ]: 117 : Assert(XLogRecPtrIsValid(rdt_data->remote_lsn) &&
4621 : : TransactionIdIsValid(rdt_data->candidate_xid));
4622 : :
4623 : : /*
4624 : : * We expect the publisher and subscriber clocks to be in sync using time
4625 : : * sync service like NTP. Otherwise, we will advance this worker's
4626 : : * oldest_nonremovable_xid prematurely, leading to the removal of rows
4627 : : * required to detect update_deleted reliably. This check primarily
4628 : : * addresses scenarios where the publisher's clock falls behind; if the
4629 : : * publisher's clock is ahead, subsequent transactions will naturally bear
4630 : : * later commit timestamps, conforming to the design outlined atop
4631 : : * worker.c.
4632 : : *
4633 : : * XXX Consider waiting for the publisher's clock to catch up with the
4634 : : * subscriber's before proceeding to the next phase.
4635 : : */
235 akapila@postgresql.o 4636 [ - + ]: 117 : if (TimestampDifferenceExceeds(rdt_data->reply_time,
4637 : : rdt_data->candidate_xid_time, 0))
235 akapila@postgresql.o 4638 [ # # ]:UNC 0 : ereport(ERROR,
4639 : : errmsg_internal("oldest_nonremovable_xid transaction ID could be advanced prematurely"),
4640 : : errdetail_internal("The clock on the publisher is behind that of the subscriber."));
4641 : :
4642 : : /*
4643 : : * Do not attempt to advance the non-removable transaction ID when table
4644 : : * sync is in progress. During this time, changes from a single
4645 : : * transaction may be applied by multiple table sync workers corresponding
4646 : : * to the target tables. So, it's necessary for all table sync workers to
4647 : : * apply and flush the corresponding changes before advancing the
4648 : : * transaction ID, otherwise, dead tuples that are still needed for
4649 : : * conflict detection in table sync workers could be removed prematurely.
4650 : : * However, confirming the apply and flush progress across all table sync
4651 : : * workers is complex and not worth the effort, so we simply return if not
4652 : : * all tables are in the READY state.
4653 : : *
4654 : : * Advancing the transaction ID is necessary even when no tables are
4655 : : * currently subscribed, to avoid retaining dead tuples unnecessarily.
4656 : : * While it might seem safe to skip all phases and directly assign
4657 : : * candidate_xid to oldest_nonremovable_xid during the
4658 : : * RDT_GET_CANDIDATE_XID phase in such cases, this is unsafe. If users
4659 : : * concurrently add tables to the subscription, the apply worker may not
4660 : : * process invalidations in time. Consequently,
4661 : : * HasSubscriptionTablesCached() might miss the new tables, leading to
4662 : : * premature advancement of oldest_nonremovable_xid.
4663 : : *
4664 : : * Performing the check during RDT_WAIT_FOR_LOCAL_FLUSH is safe, as
4665 : : * invalidations are guaranteed to be processed before applying changes
4666 : : * from newly added tables while waiting for the local flush to reach
4667 : : * remote_lsn.
4668 : : *
4669 : : * Additionally, even if we check for subscription tables during
4670 : : * RDT_GET_CANDIDATE_XID, they might be dropped before reaching
4671 : : * RDT_WAIT_FOR_LOCAL_FLUSH. Therefore, it's still necessary to verify
4672 : : * subscription tables at this stage to prevent unnecessary tuple
4673 : : * retention.
4674 : : */
150 akapila@postgresql.o 4675 [ + + + + ]:GNC 117 : if (HasSubscriptionTablesCached() && !AllTablesyncsReady())
4676 : : {
4677 : : TimestampTz now;
4678 : :
194 4679 : 34 : now = rdt_data->last_recv_time
4680 [ + + ]: 17 : ? rdt_data->last_recv_time : GetCurrentTimestamp();
4681 : :
4682 : : /*
4683 : : * Record the time spent waiting for table sync, it is needed for the
4684 : : * timeout check in should_stop_conflict_info_retention().
4685 : : */
4686 : 17 : rdt_data->table_sync_wait_time =
4687 : 17 : TimestampDifferenceMilliseconds(rdt_data->candidate_xid_time, now);
4688 : :
4689 : 17 : return;
4690 : : }
4691 : :
4692 : : /*
4693 : : * We don't need to maintain oldest_nonremovable_xid if we decide to stop
4694 : : * retaining conflict information for this worker.
4695 : : */
4696 [ + + ]: 100 : if (should_stop_conflict_info_retention(rdt_data))
4697 : : {
181 4698 : 1 : rdt_data->phase = RDT_STOP_CONFLICT_INFO_RETENTION;
235 4699 : 1 : return;
4700 : : }
4701 : :
4702 : : /*
4703 : : * Update and check the remote flush position if we are applying changes
4704 : : * in a loop. This is done at most once per WalWriterDelay to avoid
4705 : : * performing costly operations in get_flush_position() too frequently
4706 : : * during change application.
4707 : : */
4708 [ + + + + : 135 : if (last_flushpos < rdt_data->remote_lsn && rdt_data->last_recv_time &&
+ + ]
4709 : 36 : TimestampDifferenceExceeds(rdt_data->flushpos_update_time,
4710 : : rdt_data->last_recv_time, WalWriterDelay))
4711 : : {
4712 : : XLogRecPtr writepos;
4713 : : XLogRecPtr flushpos;
4714 : : bool have_pending_txes;
4715 : :
4716 : : /* Fetch the latest remote flush position */
4717 : 14 : get_flush_position(&writepos, &flushpos, &have_pending_txes);
4718 : :
4719 [ + + ]: 14 : if (flushpos > last_flushpos)
4720 : 2 : last_flushpos = flushpos;
4721 : :
4722 : 14 : rdt_data->flushpos_update_time = rdt_data->last_recv_time;
4723 : : }
4724 : :
4725 : : /* Return to wait for the changes to be applied */
4726 [ + + ]: 99 : if (last_flushpos < rdt_data->remote_lsn)
4727 : 61 : return;
4728 : :
4729 : : /*
4730 : : * Reaching this point implies should_stop_conflict_info_retention()
4731 : : * returned false earlier, meaning that the most recent duration for
4732 : : * advancing the non-removable transaction ID is within the
4733 : : * max_retention_duration or max_retention_duration is set to 0.
4734 : : *
4735 : : * Therefore, if conflict info retention was previously stopped due to a
4736 : : * timeout, it is now safe to resume retention.
4737 : : */
181 4738 [ + + ]: 38 : if (!MySubscription->retentionactive)
4739 : : {
4740 : 1 : rdt_data->phase = RDT_RESUME_CONFLICT_INFO_RETENTION;
4741 : 1 : return;
4742 : : }
4743 : :
4744 : : /*
4745 : : * Reaching here means the remote WAL position has been received, and all
4746 : : * transactions up to that position on the publisher have been applied and
4747 : : * flushed locally. So, we can advance the non-removable transaction ID.
4748 : : */
235 4749 : 37 : SpinLockAcquire(&MyLogicalRepWorker->relmutex);
4750 : 37 : MyLogicalRepWorker->oldest_nonremovable_xid = rdt_data->candidate_xid;
4751 : 37 : SpinLockRelease(&MyLogicalRepWorker->relmutex);
4752 : :
213 heikki.linnakangas@i 4753 [ + + ]: 37 : elog(DEBUG2, "confirmed flush up to remote lsn %X/%08X: new oldest_nonremovable_xid %u",
4754 : : LSN_FORMAT_ARGS(rdt_data->remote_lsn),
4755 : : rdt_data->candidate_xid);
4756 : :
4757 : : /* Notify launcher to update the xmin of the conflict slot */
235 akapila@postgresql.o 4758 : 37 : ApplyLauncherWakeup();
4759 : :
194 4760 : 37 : reset_retention_data_fields(rdt_data);
4761 : :
4762 : : /* process the next phase */
4763 : 37 : process_rdt_phase_transition(rdt_data, false);
4764 : : }
4765 : :
4766 : : /*
4767 : : * Check whether conflict information retention should be stopped due to
4768 : : * exceeding the maximum wait time (max_retention_duration).
4769 : : *
4770 : : * If retention should be stopped, return true. Otherwise, return false.
4771 : : */
4772 : : static bool
4773 : 2795 : should_stop_conflict_info_retention(RetainDeadTuplesData *rdt_data)
4774 : : {
4775 : : TimestampTz now;
4776 : :
4777 [ - + ]: 2795 : Assert(TransactionIdIsValid(rdt_data->candidate_xid));
4778 [ + + - + ]: 2795 : Assert(rdt_data->phase == RDT_WAIT_FOR_PUBLISHER_STATUS ||
4779 : : rdt_data->phase == RDT_WAIT_FOR_LOCAL_FLUSH);
4780 : :
4781 [ + + ]: 2795 : if (!MySubscription->maxretention)
4782 : 2794 : return false;
4783 : :
4784 : : /*
4785 : : * Use last_recv_time when applying changes in the loop to avoid
4786 : : * unnecessary system time retrieval. If last_recv_time is not available,
4787 : : * obtain the current timestamp.
4788 : : */
4789 [ - + ]: 1 : now = rdt_data->last_recv_time ? rdt_data->last_recv_time : GetCurrentTimestamp();
4790 : :
4791 : : /*
4792 : : * Return early if the wait time has not exceeded the configured maximum
4793 : : * (max_retention_duration). Time spent waiting for table synchronization
4794 : : * is excluded from this calculation, as it occurs infrequently.
4795 : : */
4796 [ - + ]: 1 : if (!TimestampDifferenceExceeds(rdt_data->candidate_xid_time, now,
4797 : 1 : MySubscription->maxretention +
4798 : 1 : rdt_data->table_sync_wait_time))
194 akapila@postgresql.o 4799 :UNC 0 : return false;
4800 : :
194 akapila@postgresql.o 4801 :GNC 1 : return true;
4802 : : }
4803 : :
4804 : : /*
4805 : : * Workhorse for the RDT_STOP_CONFLICT_INFO_RETENTION phase.
4806 : : */
4807 : : static void
4808 : 1 : stop_conflict_info_retention(RetainDeadTuplesData *rdt_data)
4809 : : {
4810 : : /* Stop retention if not yet */
181 4811 [ + - ]: 1 : if (MySubscription->retentionactive)
4812 : : {
4813 : : /*
4814 : : * If the retention status cannot be updated (e.g., due to active
4815 : : * transaction), skip further processing to avoid inconsistent
4816 : : * retention behavior.
4817 : : */
4818 [ - + ]: 1 : if (!update_retention_status(false))
181 akapila@postgresql.o 4819 :UNC 0 : return;
4820 : :
181 akapila@postgresql.o 4821 :GNC 1 : SpinLockAcquire(&MyLogicalRepWorker->relmutex);
4822 : 1 : MyLogicalRepWorker->oldest_nonremovable_xid = InvalidTransactionId;
4823 : 1 : SpinLockRelease(&MyLogicalRepWorker->relmutex);
4824 : :
4825 [ + - ]: 1 : ereport(LOG,
4826 : : errmsg("logical replication worker for subscription \"%s\" has stopped retaining the information for detecting conflicts",
4827 : : MySubscription->name),
4828 : : errdetail("Retention is stopped because the apply process has not caught up with the publisher within the configured max_retention_duration."));
4829 : : }
4830 : :
4831 [ - + ]: 1 : Assert(!TransactionIdIsValid(MyLogicalRepWorker->oldest_nonremovable_xid));
4832 : :
4833 : : /*
4834 : : * If retention has been stopped, reset to the initial phase to retry
4835 : : * resuming retention. This reset is required to recalculate the current
4836 : : * wait time and resume retention if the time falls within
4837 : : * max_retention_duration.
4838 : : */
4839 : 1 : reset_retention_data_fields(rdt_data);
4840 : : }
4841 : :
4842 : : /*
4843 : : * Workhorse for the RDT_RESUME_CONFLICT_INFO_RETENTION phase.
4844 : : */
4845 : : static void
4846 : 1 : resume_conflict_info_retention(RetainDeadTuplesData *rdt_data)
4847 : : {
4848 : : /* We can't resume retention without updating retention status. */
4849 [ - + ]: 1 : if (!update_retention_status(true))
181 akapila@postgresql.o 4850 :UNC 0 : return;
4851 : :
181 akapila@postgresql.o 4852 [ + - - + ]:GNC 1 : ereport(LOG,
4853 : : errmsg("logical replication worker for subscription \"%s\" will resume retaining the information for detecting conflicts",
4854 : : MySubscription->name),
4855 : : MySubscription->maxretention
4856 : : ? errdetail("Retention is re-enabled because the apply process has caught up with the publisher within the configured max_retention_duration.")
4857 : : : errdetail("Retention is re-enabled because max_retention_duration has been set to unlimited."));
4858 : :
4859 : : /*
4860 : : * Restart the worker to let the launcher initialize
4861 : : * oldest_nonremovable_xid at startup.
4862 : : *
4863 : : * While it's technically possible to derive this value on-the-fly using
4864 : : * the conflict detection slot's xmin, doing so risks a race condition:
4865 : : * the launcher might clean slot.xmin just after retention resumes. This
4866 : : * would make oldest_nonremovable_xid unreliable, especially during xid
4867 : : * wraparound.
4868 : : *
4869 : : * Although this can be prevented by introducing heavy weight locking, the
4870 : : * complexity it will bring doesn't seem worthwhile given how rarely
4871 : : * retention is resumed.
4872 : : */
4873 : 1 : apply_worker_exit();
4874 : : }
4875 : :
4876 : : /*
4877 : : * Updates pg_subscription.subretentionactive to the given value within a
4878 : : * new transaction.
4879 : : *
4880 : : * If already inside an active transaction, skips the update and returns
4881 : : * false.
4882 : : *
4883 : : * Returns true if the update is successfully performed.
4884 : : */
4885 : : static bool
4886 : 2 : update_retention_status(bool active)
4887 : : {
4888 : : /*
4889 : : * Do not update the catalog during an active transaction. The transaction
4890 : : * may be started during change application, leading to a possible
4891 : : * rollback of catalog updates if the application fails subsequently.
4892 : : */
194 4893 [ - + ]: 2 : if (IsTransactionState())
181 akapila@postgresql.o 4894 :UNC 0 : return false;
4895 : :
194 akapila@postgresql.o 4896 :GNC 2 : StartTransactionCommand();
4897 : :
4898 : : /*
4899 : : * Updating pg_subscription might involve TOAST table access, so ensure we
4900 : : * have a valid snapshot.
4901 : : */
4902 : 2 : PushActiveSnapshot(GetTransactionSnapshot());
4903 : :
4904 : : /* Update pg_subscription.subretentionactive */
181 4905 : 2 : UpdateDeadTupleRetentionStatus(MySubscription->oid, active);
4906 : :
194 4907 : 2 : PopActiveSnapshot();
4908 : 2 : CommitTransactionCommand();
4909 : :
4910 : : /* Notify launcher to update the conflict slot */
4911 : 2 : ApplyLauncherWakeup();
4912 : :
181 4913 : 2 : MySubscription->retentionactive = active;
4914 : :
4915 : 2 : return true;
4916 : : }
4917 : :
4918 : : /*
4919 : : * Reset all data fields of RetainDeadTuplesData except those used to
4920 : : * determine the timing for the next round of transaction ID advancement. We
4921 : : * can even use flushpos_update_time in the next round to decide whether to get
4922 : : * the latest flush position.
4923 : : */
4924 : : static void
194 4925 : 38 : reset_retention_data_fields(RetainDeadTuplesData *rdt_data)
4926 : : {
235 4927 : 38 : rdt_data->phase = RDT_GET_CANDIDATE_XID;
4928 : 38 : rdt_data->remote_lsn = InvalidXLogRecPtr;
4929 : 38 : rdt_data->remote_oldestxid = InvalidFullTransactionId;
4930 : 38 : rdt_data->remote_nextxid = InvalidFullTransactionId;
4931 : 38 : rdt_data->reply_time = 0;
4932 : 38 : rdt_data->remote_wait_for = InvalidFullTransactionId;
4933 : 38 : rdt_data->candidate_xid = InvalidTransactionId;
194 4934 : 38 : rdt_data->table_sync_wait_time = 0;
235 4935 : 38 : }
4936 : :
4937 : : /*
4938 : : * Adjust the interval for advancing non-removable transaction IDs.
4939 : : *
4940 : : * If there is no activity on the node or retention has been stopped, we
4941 : : * progressively double the interval used to advance non-removable transaction
4942 : : * ID. This helps conserve CPU and network resources when there's little benefit
4943 : : * to frequent updates.
4944 : : *
4945 : : * The interval is capped by the lowest of the following:
4946 : : * - wal_receiver_status_interval (if set and retention is active),
4947 : : * - a default maximum of 3 minutes,
4948 : : * - max_retention_duration (if retention is active).
4949 : : *
4950 : : * This ensures the interval never exceeds the retention boundary, even if other
4951 : : * limits are higher. Once activity resumes on the node and the retention is
4952 : : * active, the interval is reset to lesser of 100ms and max_retention_duration,
4953 : : * allowing timely advancement of non-removable transaction ID.
4954 : : *
4955 : : * XXX The use of wal_receiver_status_interval is a bit arbitrary so we can
4956 : : * consider the other interval or a separate GUC if the need arises.
4957 : : */
4958 : : static void
4959 : 171 : adjust_xid_advance_interval(RetainDeadTuplesData *rdt_data, bool new_xid_found)
4960 : : {
181 4961 [ - + - - ]: 171 : if (rdt_data->xid_advance_interval && !new_xid_found)
235 akapila@postgresql.o 4962 :UNC 0 : {
4963 : 0 : int max_interval = wal_receiver_status_interval
4964 : 0 : ? wal_receiver_status_interval * 1000
4965 [ # # ]: 0 : : MAX_XID_ADVANCE_INTERVAL;
4966 : :
4967 : : /*
4968 : : * No new transaction ID has been assigned since the last check, so
4969 : : * double the interval, but not beyond the maximum allowable value.
4970 : : */
4971 : 0 : rdt_data->xid_advance_interval = Min(rdt_data->xid_advance_interval * 2,
4972 : : max_interval);
4973 : : }
181 akapila@postgresql.o 4974 [ - + ]:GNC 171 : else if (rdt_data->xid_advance_interval &&
181 akapila@postgresql.o 4975 [ # # ]:UNC 0 : !MySubscription->retentionactive)
4976 : : {
4977 : : /*
4978 : : * Retention has been stopped, so double the interval-capped at a
4979 : : * maximum of 3 minutes. The wal_receiver_status_interval is
4980 : : * intentionally not used as a upper bound, since the likelihood of
4981 : : * retention resuming is lower than that of general activity resuming.
4982 : : */
4983 : 0 : rdt_data->xid_advance_interval = Min(rdt_data->xid_advance_interval * 2,
4984 : : MAX_XID_ADVANCE_INTERVAL);
4985 : : }
4986 : : else
4987 : : {
4988 : : /*
4989 : : * A new transaction ID was found or the interval is not yet
4990 : : * initialized, so set the interval to the minimum value.
4991 : : */
235 akapila@postgresql.o 4992 :GNC 171 : rdt_data->xid_advance_interval = MIN_XID_ADVANCE_INTERVAL;
4993 : : }
4994 : :
4995 : : /*
4996 : : * Ensure the wait time remains within the maximum retention time limit
4997 : : * when retention is active.
4998 : : */
181 4999 [ + + ]: 171 : if (MySubscription->retentionactive)
5000 : 170 : rdt_data->xid_advance_interval = Min(rdt_data->xid_advance_interval,
5001 : : MySubscription->maxretention);
235 5002 : 171 : }
5003 : :
5004 : : /*
5005 : : * Exit routine for apply workers due to subscription parameter changes.
5006 : : */
5007 : : static void
1161 akapila@postgresql.o 5008 :CBC 46 : apply_worker_exit(void)
5009 : : {
5010 [ - + ]: 46 : if (am_parallel_apply_worker())
5011 : : {
5012 : : /*
5013 : : * Don't stop the parallel apply worker as the leader will detect the
5014 : : * subscription parameter change and restart logical replication later
5015 : : * anyway. This also prevents the leader from reporting errors when
5016 : : * trying to communicate with a stopped parallel apply worker, which
5017 : : * would accidentally disable subscriptions if disable_on_error was
5018 : : * set.
5019 : : */
1161 akapila@postgresql.o 5020 :UBC 0 : return;
5021 : : }
5022 : :
5023 : : /*
5024 : : * Reset the last-start time for this apply worker so that the launcher
5025 : : * will restart it without waiting for wal_retrieve_retry_interval if the
5026 : : * subscription is still active, and so that we won't leak that hash table
5027 : : * entry if it isn't.
5028 : : */
954 akapila@postgresql.o 5029 [ + - ]:CBC 46 : if (am_leader_apply_worker())
1148 tgl@sss.pgh.pa.us 5030 : 46 : ApplyLauncherForgetWorkerStartTime(MyLogicalRepWorker->subid);
5031 : :
1161 akapila@postgresql.o 5032 : 46 : proc_exit(0);
5033 : : }
5034 : :
5035 : : /*
5036 : : * Reread subscription info if needed.
5037 : : *
5038 : : * For significant changes, we react by exiting the current process; a new
5039 : : * one will be launched afterwards if needed.
5040 : : */
5041 : : void
3207 peter_e@gmx.net 5042 : 6168 : maybe_reread_subscription(void)
5043 : : {
5044 : : MemoryContext oldctx;
5045 : : Subscription *newsub;
3224 bruce@momjian.us 5046 : 6168 : bool started_tx = false;
5047 : :
5048 : : /* When cache state is valid there is nothing to do here. */
3207 peter_e@gmx.net 5049 [ + + ]: 6168 : if (MySubscriptionValid)
5050 : 6076 : return;
5051 : :
5052 : : /* This function might be called inside or outside of transaction. */
3279 5053 [ + + ]: 92 : if (!IsTransactionState())
5054 : : {
5055 : 85 : StartTransactionCommand();
5056 : 85 : started_tx = true;
5057 : : }
5058 : :
5059 : : /* Ensure allocations in permanent context. */
3232 5060 : 92 : oldctx = MemoryContextSwitchTo(ApplyContext);
5061 : :
9 jdavis@postgresql.or 5062 :GNC 92 : newsub = GetSubscription(MyLogicalRepWorker->subid, true, true);
5063 : :
5064 : : /*
5065 : : * Exit if the subscription was removed. This normally should not happen
5066 : : * as the worker gets killed during DROP SUBSCRIPTION.
5067 : : */
3338 peter_e@gmx.net 5068 [ - + ]:CBC 92 : if (!newsub)
5069 : : {
3342 peter_e@gmx.net 5070 [ # # ]:UBC 0 : ereport(LOG,
5071 : : (errmsg("logical replication worker for subscription \"%s\" will stop because the subscription was removed",
5072 : : MySubscription->name)));
5073 : :
5074 : : /* Ensure we remove no-longer-useful entry for worker's start time */
954 akapila@postgresql.o 5075 [ # # ]: 0 : if (am_leader_apply_worker())
1148 tgl@sss.pgh.pa.us 5076 : 0 : ApplyLauncherForgetWorkerStartTime(MyLogicalRepWorker->subid);
5077 : :
3342 peter_e@gmx.net 5078 : 0 : proc_exit(0);
5079 : : }
5080 : :
5081 : : /* Exit if the subscription was disabled. */
3232 peter_e@gmx.net 5082 [ + + ]:CBC 92 : if (!newsub->enabled)
5083 : : {
5084 [ + - ]: 14 : ereport(LOG,
5085 : : (errmsg("logical replication worker for subscription \"%s\" will stop because the subscription was disabled",
5086 : : MySubscription->name)));
5087 : :
1161 akapila@postgresql.o 5088 : 14 : apply_worker_exit();
5089 : : }
5090 : :
5091 : : /* !slotname should never happen when enabled is true. */
3232 peter_e@gmx.net 5092 [ - + ]: 78 : Assert(newsub->slotname);
5093 : :
5094 : : /* two-phase cannot be altered while the worker is running */
1705 akapila@postgresql.o 5095 [ - + ]: 78 : Assert(newsub->twophasestate == MySubscription->twophasestate);
5096 : :
5097 : : /*
5098 : : * Exit if any parameter that affects the remote connection was changed.
5099 : : * The launcher will start a new worker but note that the parallel apply
5100 : : * worker won't restart if the streaming option's value is changed from
5101 : : * 'parallel' to any other value or the server decides not to stream the
5102 : : * in-progress transaction.
5103 : : */
2066 tgl@sss.pgh.pa.us 5104 [ + + ]: 78 : if (strcmp(newsub->conninfo, MySubscription->conninfo) != 0 ||
5105 [ + + ]: 76 : strcmp(newsub->name, MySubscription->name) != 0 ||
5106 [ + - ]: 75 : strcmp(newsub->slotname, MySubscription->slotname) != 0 ||
5107 [ + + ]: 75 : newsub->binary != MySubscription->binary ||
2019 akapila@postgresql.o 5108 [ + + ]: 69 : newsub->stream != MySubscription->stream ||
1060 5109 [ + - ]: 64 : newsub->passwordrequired != MySubscription->passwordrequired ||
1333 5110 [ + + ]: 64 : strcmp(newsub->origin, MySubscription->origin) != 0 ||
1528 jdavis@postgresql.or 5111 [ + + ]: 62 : newsub->owner != MySubscription->owner ||
2066 tgl@sss.pgh.pa.us 5112 [ + + ]: 61 : !equal(newsub->publications, MySubscription->publications))
5113 : : {
1161 akapila@postgresql.o 5114 [ - + ]: 27 : if (am_parallel_apply_worker())
1161 akapila@postgresql.o 5115 [ # # ]:UBC 0 : ereport(LOG,
5116 : : (errmsg("logical replication parallel apply worker for subscription \"%s\" will stop because of a parameter change",
5117 : : MySubscription->name)));
5118 : : else
1161 akapila@postgresql.o 5119 [ + - ]:CBC 27 : ereport(LOG,
5120 : : (errmsg("logical replication worker for subscription \"%s\" will restart because of a parameter change",
5121 : : MySubscription->name)));
5122 : :
5123 : 27 : apply_worker_exit();
5124 : : }
5125 : :
5126 : : /*
5127 : : * Exit if the subscription owner's superuser privileges have been
5128 : : * revoked.
5129 : : */
880 5130 [ + + + + ]: 51 : if (!newsub->ownersuperuser && MySubscription->ownersuperuser)
5131 : : {
5132 [ - + ]: 4 : if (am_parallel_apply_worker())
880 akapila@postgresql.o 5133 [ # # ]:UBC 0 : ereport(LOG,
5134 : : errmsg("logical replication parallel apply worker for subscription \"%s\" will stop because the subscription owner's superuser privileges have been revoked",
5135 : : MySubscription->name));
5136 : : else
880 akapila@postgresql.o 5137 [ + - ]:CBC 4 : ereport(LOG,
5138 : : errmsg("logical replication worker for subscription \"%s\" will restart because the subscription owner's superuser privileges have been revoked",
5139 : : MySubscription->name));
5140 : :
5141 : 4 : apply_worker_exit();
5142 : : }
5143 : :
5144 : : /* Check for other changes that should never happen too. */
3268 peter_e@gmx.net 5145 [ - + ]: 47 : if (newsub->dbid != MySubscription->dbid)
5146 : : {
3342 peter_e@gmx.net 5147 [ # # ]:UBC 0 : elog(ERROR, "subscription %u changed unexpectedly",
5148 : : MyLogicalRepWorker->subid);
5149 : : }
5150 : :
5151 : : /* Clean old subscription info and switch to new one. */
3342 peter_e@gmx.net 5152 :CBC 47 : FreeSubscription(MySubscription);
5153 : 47 : MySubscription = newsub;
5154 : :
5155 : 47 : MemoryContextSwitchTo(oldctx);
5156 : :
5157 : : /* Change synchronous commit according to the user's wishes */
3257 5158 : 47 : SetConfigOption("synchronous_commit", MySubscription->synccommit,
5159 : : PGC_BACKEND, PGC_S_OVERRIDE);
5160 : :
5161 : : /* Change wal_receiver_timeout according to the user's wishes */
23 fujii@postgresql.org 5162 :GNC 47 : set_wal_receiver_timeout();
5163 : :
3279 peter_e@gmx.net 5164 [ + + ]:CBC 47 : if (started_tx)
5165 : 43 : CommitTransactionCommand();
5166 : :
3342 5167 : 47 : MySubscriptionValid = true;
5168 : : }
5169 : :
5170 : : /*
5171 : : * Change wal_receiver_timeout to MySubscription->walrcvtimeout.
5172 : : */
5173 : : static void
23 fujii@postgresql.org 5174 :GNC 554 : set_wal_receiver_timeout(void)
5175 : : {
5176 : : bool parsed;
5177 : : int val;
5178 : 554 : int prev_timeout = wal_receiver_timeout;
5179 : :
5180 : : /*
5181 : : * Set the wal_receiver_timeout GUC to MySubscription->walrcvtimeout,
5182 : : * which comes from the subscription's wal_receiver_timeout option. If the
5183 : : * value is -1, reset the GUC to its default, meaning it will inherit from
5184 : : * the server config, command line, or role/database settings.
5185 : : */
5186 : 554 : parsed = parse_int(MySubscription->walrcvtimeout, &val, 0, NULL);
5187 [ + - + - ]: 554 : if (parsed && val == -1)
5188 : 554 : SetConfigOption("wal_receiver_timeout", NULL,
5189 : : PGC_BACKEND, PGC_S_SESSION);
5190 : : else
23 fujii@postgresql.org 5191 :UNC 0 : SetConfigOption("wal_receiver_timeout", MySubscription->walrcvtimeout,
5192 : : PGC_BACKEND, PGC_S_SESSION);
5193 : :
5194 : : /*
5195 : : * Log the wal_receiver_timeout setting (in milliseconds) as a debug
5196 : : * message when it changes, to verify it was set correctly.
5197 : : */
23 fujii@postgresql.org 5198 [ - + ]:GNC 554 : if (prev_timeout != wal_receiver_timeout)
23 fujii@postgresql.org 5199 [ # # ]:UNC 0 : elog(DEBUG1, "logical replication worker for subscription \"%s\" wal_receiver_timeout: %d ms",
5200 : : MySubscription->name, wal_receiver_timeout);
23 fujii@postgresql.org 5201 :GNC 554 : }
5202 : :
5203 : : /*
5204 : : * Callback from subscription syscache invalidation. Also needed for server or
5205 : : * user mapping invalidation, which can change the connection information for
5206 : : * subscriptions that connect using a server object.
5207 : : */
5208 : : static void
25 michael@paquier.xyz 5209 : 94 : subscription_change_cb(Datum arg, SysCacheIdentifier cacheid, uint32 hashvalue)
5210 : : {
3342 peter_e@gmx.net 5211 :CBC 94 : MySubscriptionValid = false;
5212 : 94 : }
5213 : :
5214 : : /*
5215 : : * subxact_info_write
5216 : : * Store information about subxacts for a toplevel transaction.
5217 : : *
5218 : : * For each subxact we store offset of its first change in the main file.
5219 : : * The file is always over-written as a whole.
5220 : : *
5221 : : * XXX We should only store subxacts that were not aborted yet.
5222 : : */
5223 : : static void
2019 akapila@postgresql.o 5224 : 372 : subxact_info_write(Oid subid, TransactionId xid)
5225 : : {
5226 : : char path[MAXPGPATH];
5227 : : Size len;
5228 : : BufFile *fd;
5229 : :
5230 [ - + ]: 372 : Assert(TransactionIdIsValid(xid));
5231 : :
5232 : : /* construct the subxact filename */
1655 5233 : 372 : subxact_filename(path, subid, xid);
5234 : :
5235 : : /* Delete the subxacts file, if exists. */
2019 5236 [ + + ]: 372 : if (subxact_data.nsubxacts == 0)
5237 : : {
1655 5238 : 290 : cleanup_subxact_info();
5239 : 290 : BufFileDeleteFileSet(MyLogicalRepWorker->stream_fileset, path, true);
5240 : :
2019 5241 : 290 : return;
5242 : : }
5243 : :
5244 : : /*
5245 : : * Create the subxact file if it not already created, otherwise open the
5246 : : * existing file.
5247 : : */
1655 5248 : 82 : fd = BufFileOpenFileSet(MyLogicalRepWorker->stream_fileset, path, O_RDWR,
5249 : : true);
5250 [ + + ]: 82 : if (fd == NULL)
5251 : 8 : fd = BufFileCreateFileSet(MyLogicalRepWorker->stream_fileset, path);
5252 : :
2019 5253 : 82 : len = sizeof(SubXactInfo) * subxact_data.nsubxacts;
5254 : :
5255 : : /* Write the subxact count and subxact info */
5256 : 82 : BufFileWrite(fd, &subxact_data.nsubxacts, sizeof(subxact_data.nsubxacts));
5257 : 82 : BufFileWrite(fd, subxact_data.subxacts, len);
5258 : :
5259 : 82 : BufFileClose(fd);
5260 : :
5261 : : /* free the memory allocated for subxact info */
5262 : 82 : cleanup_subxact_info();
5263 : : }
5264 : :
5265 : : /*
5266 : : * subxact_info_read
5267 : : * Restore information about subxacts of a streamed transaction.
5268 : : *
5269 : : * Read information about subxacts into the structure subxact_data that can be
5270 : : * used later.
5271 : : */
5272 : : static void
5273 : 344 : subxact_info_read(Oid subid, TransactionId xid)
5274 : : {
5275 : : char path[MAXPGPATH];
5276 : : Size len;
5277 : : BufFile *fd;
5278 : : MemoryContext oldctx;
5279 : :
5280 [ - + ]: 344 : Assert(!subxact_data.subxacts);
5281 [ - + ]: 344 : Assert(subxact_data.nsubxacts == 0);
5282 [ - + ]: 344 : Assert(subxact_data.nsubxacts_max == 0);
5283 : :
5284 : : /*
5285 : : * If the subxact file doesn't exist that means we don't have any subxact
5286 : : * info.
5287 : : */
5288 : 344 : subxact_filename(path, subid, xid);
1655 5289 : 344 : fd = BufFileOpenFileSet(MyLogicalRepWorker->stream_fileset, path, O_RDONLY,
5290 : : true);
5291 [ + + ]: 344 : if (fd == NULL)
5292 : 265 : return;
5293 : :
5294 : : /* read number of subxact items */
1154 peter@eisentraut.org 5295 : 79 : BufFileReadExact(fd, &subxact_data.nsubxacts, sizeof(subxact_data.nsubxacts));
5296 : :
2019 akapila@postgresql.o 5297 : 79 : len = sizeof(SubXactInfo) * subxact_data.nsubxacts;
5298 : :
5299 : : /* we keep the maximum as a power of 2 */
186 michael@paquier.xyz 5300 :GNC 79 : subxact_data.nsubxacts_max = 1 << pg_ceil_log2_32(subxact_data.nsubxacts);
5301 : :
5302 : : /*
5303 : : * Allocate subxact information in the logical streaming context. We need
5304 : : * this information during the complete stream so that we can add the sub
5305 : : * transaction info to this. On stream stop we will flush this information
5306 : : * to the subxact file and reset the logical streaming context.
5307 : : */
2019 akapila@postgresql.o 5308 :CBC 79 : oldctx = MemoryContextSwitchTo(LogicalStreamingContext);
9 msawada@postgresql.o 5309 :GNC 79 : subxact_data.subxacts = palloc_array(SubXactInfo,
5310 : : subxact_data.nsubxacts_max);
2019 akapila@postgresql.o 5311 :CBC 79 : MemoryContextSwitchTo(oldctx);
5312 : :
1154 peter@eisentraut.org 5313 [ + - ]: 79 : if (len > 0)
5314 : 79 : BufFileReadExact(fd, subxact_data.subxacts, len);
5315 : :
2019 akapila@postgresql.o 5316 : 79 : BufFileClose(fd);
5317 : : }
5318 : :
5319 : : /*
5320 : : * subxact_info_add
5321 : : * Add information about a subxact (offset in the main file).
5322 : : */
5323 : : static void
5324 : 102513 : subxact_info_add(TransactionId xid)
5325 : : {
5326 : 102513 : SubXactInfo *subxacts = subxact_data.subxacts;
5327 : : int64 i;
5328 : :
5329 : : /* We must have a valid top level stream xid and a stream fd. */
5330 [ - + ]: 102513 : Assert(TransactionIdIsValid(stream_xid));
5331 [ - + ]: 102513 : Assert(stream_fd != NULL);
5332 : :
5333 : : /*
5334 : : * If the XID matches the toplevel transaction, we don't want to add it.
5335 : : */
5336 [ + + ]: 102513 : if (stream_xid == xid)
5337 : 92389 : return;
5338 : :
5339 : : /*
5340 : : * In most cases we're checking the same subxact as we've already seen in
5341 : : * the last call, so make sure to ignore it (this change comes later).
5342 : : */
5343 [ + + ]: 10124 : if (subxact_data.subxact_last == xid)
5344 : 10048 : return;
5345 : :
5346 : : /* OK, remember we're processing this XID. */
5347 : 76 : subxact_data.subxact_last = xid;
5348 : :
5349 : : /*
5350 : : * Check if the transaction is already present in the array of subxact. We
5351 : : * intentionally scan the array from the tail, because we're likely adding
5352 : : * a change for the most recent subtransactions.
5353 : : *
5354 : : * XXX Can we rely on the subxact XIDs arriving in sorted order? That
5355 : : * would allow us to use binary search here.
5356 : : */
5357 [ + + ]: 95 : for (i = subxact_data.nsubxacts; i > 0; i--)
5358 : : {
5359 : : /* found, so we're done */
5360 [ + + ]: 76 : if (subxacts[i - 1].xid == xid)
5361 : 57 : return;
5362 : : }
5363 : :
5364 : : /* This is a new subxact, so we need to add it to the array. */
5365 [ + + ]: 19 : if (subxact_data.nsubxacts == 0)
5366 : : {
5367 : : MemoryContext oldctx;
5368 : :
5369 : 8 : subxact_data.nsubxacts_max = 128;
5370 : :
5371 : : /*
5372 : : * Allocate this memory for subxacts in per-stream context, see
5373 : : * subxact_info_read.
5374 : : */
5375 : 8 : oldctx = MemoryContextSwitchTo(LogicalStreamingContext);
9 msawada@postgresql.o 5376 :GNC 8 : subxacts = palloc_array(SubXactInfo, subxact_data.nsubxacts_max);
2019 akapila@postgresql.o 5377 :CBC 8 : MemoryContextSwitchTo(oldctx);
5378 : : }
5379 [ + + ]: 11 : else if (subxact_data.nsubxacts == subxact_data.nsubxacts_max)
5380 : : {
5381 : 10 : subxact_data.nsubxacts_max *= 2;
9 msawada@postgresql.o 5382 :GNC 10 : subxacts = repalloc_array(subxacts, SubXactInfo,
5383 : : subxact_data.nsubxacts_max);
5384 : : }
5385 : :
2019 akapila@postgresql.o 5386 :CBC 19 : subxacts[subxact_data.nsubxacts].xid = xid;
5387 : :
5388 : : /*
5389 : : * Get the current offset of the stream file and store it as offset of
5390 : : * this subxact.
5391 : : */
5392 : 19 : BufFileTell(stream_fd,
5393 : 19 : &subxacts[subxact_data.nsubxacts].fileno,
5394 : 19 : &subxacts[subxact_data.nsubxacts].offset);
5395 : :
5396 : 19 : subxact_data.nsubxacts++;
5397 : 19 : subxact_data.subxacts = subxacts;
5398 : : }
5399 : :
5400 : : /* format filename for file containing the info about subxacts */
5401 : : static inline void
5402 : 747 : subxact_filename(char *path, Oid subid, TransactionId xid)
5403 : : {
5404 : 747 : snprintf(path, MAXPGPATH, "%u-%u.subxacts", subid, xid);
5405 : 747 : }
5406 : :
5407 : : /* format filename for file containing serialized changes */
5408 : : static inline void
5409 : 438 : changes_filename(char *path, Oid subid, TransactionId xid)
5410 : : {
5411 : 438 : snprintf(path, MAXPGPATH, "%u-%u.changes", subid, xid);
5412 : 438 : }
5413 : :
5414 : : /*
5415 : : * stream_cleanup_files
5416 : : * Cleanup files for a subscription / toplevel transaction.
5417 : : *
5418 : : * Remove files with serialized changes and subxact info for a particular
5419 : : * toplevel transaction. Each subscription has a separate set of files
5420 : : * for any toplevel transaction.
5421 : : */
5422 : : void
5423 : 31 : stream_cleanup_files(Oid subid, TransactionId xid)
5424 : : {
5425 : : char path[MAXPGPATH];
5426 : :
5427 : : /* Delete the changes file. */
5428 : 31 : changes_filename(path, subid, xid);
1655 5429 : 31 : BufFileDeleteFileSet(MyLogicalRepWorker->stream_fileset, path, false);
5430 : :
5431 : : /* Delete the subxact file, if it exists. */
5432 : 31 : subxact_filename(path, subid, xid);
5433 : 31 : BufFileDeleteFileSet(MyLogicalRepWorker->stream_fileset, path, true);
2019 5434 : 31 : }
5435 : :
5436 : : /*
5437 : : * stream_open_file
5438 : : * Open a file that we'll use to serialize changes for a toplevel
5439 : : * transaction.
5440 : : *
5441 : : * Open a file for streamed changes from a toplevel transaction identified
5442 : : * by stream_xid (global variable). If it's the first chunk of streamed
5443 : : * changes for this transaction, create the buffile, otherwise open the
5444 : : * previously created file.
5445 : : */
5446 : : static void
5447 : 363 : stream_open_file(Oid subid, TransactionId xid, bool first_segment)
5448 : : {
5449 : : char path[MAXPGPATH];
5450 : : MemoryContext oldcxt;
5451 : :
5452 [ - + ]: 363 : Assert(OidIsValid(subid));
5453 [ - + ]: 363 : Assert(TransactionIdIsValid(xid));
5454 [ - + ]: 363 : Assert(stream_fd == NULL);
5455 : :
5456 : :
5457 : 363 : changes_filename(path, subid, xid);
5458 [ - + ]: 363 : elog(DEBUG1, "opening file \"%s\" for streamed changes", path);
5459 : :
5460 : : /*
5461 : : * Create/open the buffiles under the logical streaming context so that we
5462 : : * have those files until stream stop.
5463 : : */
5464 : 363 : oldcxt = MemoryContextSwitchTo(LogicalStreamingContext);
5465 : :
5466 : : /*
5467 : : * If this is the first streamed segment, create the changes file.
5468 : : * Otherwise, just open the file for writing, in append mode.
5469 : : */
5470 [ + + ]: 363 : if (first_segment)
1655 5471 : 32 : stream_fd = BufFileCreateFileSet(MyLogicalRepWorker->stream_fileset,
5472 : : path);
5473 : : else
5474 : : {
5475 : : /*
5476 : : * Open the file and seek to the end of the file because we always
5477 : : * append the changes file.
5478 : : */
5479 : 331 : stream_fd = BufFileOpenFileSet(MyLogicalRepWorker->stream_fileset,
5480 : : path, O_RDWR, false);
2019 5481 : 331 : BufFileSeek(stream_fd, 0, 0, SEEK_END);
5482 : : }
5483 : :
5484 : 363 : MemoryContextSwitchTo(oldcxt);
5485 : 363 : }
5486 : :
5487 : : /*
5488 : : * stream_close_file
5489 : : * Close the currently open file with streamed changes.
5490 : : */
5491 : : static void
5492 : 393 : stream_close_file(void)
5493 : : {
5494 [ - + ]: 393 : Assert(stream_fd != NULL);
5495 : :
5496 : 393 : BufFileClose(stream_fd);
5497 : :
5498 : 393 : stream_fd = NULL;
5499 : 393 : }
5500 : :
5501 : : /*
5502 : : * stream_write_change
5503 : : * Serialize a change to a file for the current toplevel transaction.
5504 : : *
5505 : : * The change is serialized in a simple format, with length (not including
5506 : : * the length), action code (identifying the message type) and message
5507 : : * contents (without the subxact TransactionId value).
5508 : : */
5509 : : static void
5510 : 107554 : stream_write_change(char action, StringInfo s)
5511 : : {
5512 : : int len;
5513 : :
5514 [ - + ]: 107554 : Assert(stream_fd != NULL);
5515 : :
5516 : : /* total on-disk size, including the action type character */
5517 : 107554 : len = (s->len - s->cursor) + sizeof(char);
5518 : :
5519 : : /* first write the size */
5520 : 107554 : BufFileWrite(stream_fd, &len, sizeof(len));
5521 : :
5522 : : /* then the action */
5523 : 107554 : BufFileWrite(stream_fd, &action, sizeof(action));
5524 : :
5525 : : /* and finally the remaining part of the buffer (after the XID) */
5526 : 107554 : len = (s->len - s->cursor);
5527 : :
5528 : 107554 : BufFileWrite(stream_fd, &s->data[s->cursor], len);
5529 : 107554 : }
5530 : :
5531 : : /*
5532 : : * stream_open_and_write_change
5533 : : * Serialize a message to a file for the given transaction.
5534 : : *
5535 : : * This function is similar to stream_write_change except that it will open the
5536 : : * target file if not already before writing the message and close the file at
5537 : : * the end.
5538 : : */
5539 : : static void
1161 5540 : 5 : stream_open_and_write_change(TransactionId xid, char action, StringInfo s)
5541 : : {
5542 [ - + ]: 5 : Assert(!in_streamed_transaction);
5543 : :
5544 [ + - ]: 5 : if (!stream_fd)
5545 : 5 : stream_start_internal(xid, false);
5546 : :
5547 : 5 : stream_write_change(action, s);
5548 : 5 : stream_stop_internal(xid);
5549 : 5 : }
5550 : :
5551 : : /*
5552 : : * Sets streaming options including replication slot name and origin start
5553 : : * position. Workers need these options for logical replication.
5554 : : */
5555 : : void
955 5556 : 434 : set_stream_options(WalRcvStreamOptions *options,
5557 : : char *slotname,
5558 : : XLogRecPtr *origin_startpos)
5559 : : {
5560 : : int server_version;
5561 : :
5562 : 434 : options->logical = true;
5563 : 434 : options->startpoint = *origin_startpos;
5564 : 434 : options->slotname = slotname;
5565 : :
5566 : 434 : server_version = walrcv_server_version(LogRepWorkerWalRcvConn);
5567 : 434 : options->proto.logical.proto_version =
5568 [ - + - - : 434 : server_version >= 160000 ? LOGICALREP_PROTO_STREAM_PARALLEL_VERSION_NUM :
- - ]
5569 : : server_version >= 150000 ? LOGICALREP_PROTO_TWOPHASE_VERSION_NUM :
5570 : : server_version >= 140000 ? LOGICALREP_PROTO_STREAM_VERSION_NUM :
5571 : : LOGICALREP_PROTO_VERSION_NUM;
5572 : :
5573 : 434 : options->proto.logical.publication_names = MySubscription->publications;
5574 : 434 : options->proto.logical.binary = MySubscription->binary;
5575 : :
5576 : : /*
5577 : : * Assign the appropriate option value for streaming option according to
5578 : : * the 'streaming' mode and the publisher's ability to support that mode.
5579 : : */
5580 [ + - ]: 434 : if (server_version >= 160000 &&
5581 [ + + ]: 434 : MySubscription->stream == LOGICALREP_STREAM_PARALLEL)
5582 : : {
5583 : 400 : options->proto.logical.streaming_str = "parallel";
5584 : 400 : MyLogicalRepWorker->parallel_apply = true;
5585 : : }
5586 [ + - ]: 34 : else if (server_version >= 140000 &&
5587 [ + + ]: 34 : MySubscription->stream != LOGICALREP_STREAM_OFF)
5588 : : {
5589 : 26 : options->proto.logical.streaming_str = "on";
5590 : 26 : MyLogicalRepWorker->parallel_apply = false;
5591 : : }
5592 : : else
5593 : : {
5594 : 8 : options->proto.logical.streaming_str = NULL;
5595 : 8 : MyLogicalRepWorker->parallel_apply = false;
5596 : : }
5597 : :
5598 : 434 : options->proto.logical.twophase = false;
5599 : 434 : options->proto.logical.origin = pstrdup(MySubscription->origin);
5600 : 434 : }
5601 : :
5602 : : /*
5603 : : * Cleanup the memory for subxacts and reset the related variables.
5604 : : */
5605 : : static inline void
102 nathan@postgresql.or 5606 :GNC 376 : cleanup_subxact_info(void)
5607 : : {
2019 akapila@postgresql.o 5608 [ + + ]:CBC 376 : if (subxact_data.subxacts)
5609 : 87 : pfree(subxact_data.subxacts);
5610 : :
5611 : 376 : subxact_data.subxacts = NULL;
5612 : 376 : subxact_data.subxact_last = InvalidTransactionId;
5613 : 376 : subxact_data.nsubxacts = 0;
5614 : 376 : subxact_data.nsubxacts_max = 0;
5615 : 376 : }
5616 : :
5617 : : /*
5618 : : * Common function to run the apply loop with error handling. Disable the
5619 : : * subscription, if necessary.
5620 : : *
5621 : : * Note that we don't handle FATAL errors which are probably because
5622 : : * of system resource error and are not repeatable.
5623 : : */
5624 : : void
955 5625 : 434 : start_apply(XLogRecPtr origin_startpos)
5626 : : {
1462 5627 [ + + ]: 434 : PG_TRY();
5628 : : {
955 5629 : 434 : LogicalRepApplyLoop(origin_startpos);
5630 : : }
1462 5631 : 87 : PG_CATCH();
5632 : : {
5633 : : /*
5634 : : * Reset the origin state to prevent the advancement of origin
5635 : : * progress if we fail to apply. Otherwise, this will result in
5636 : : * transaction loss as that transaction won't be sent again by the
5637 : : * server.
5638 : : */
46 msawada@postgresql.o 5639 :GNC 87 : replorigin_xact_clear(true);
5640 : :
1462 akapila@postgresql.o 5641 [ + + ]:CBC 87 : if (MySubscription->disableonerr)
5642 : 3 : DisableSubscriptionAndExit();
5643 : : else
5644 : : {
5645 : : /*
5646 : : * Report the worker failed while applying changes. Abort the
5647 : : * current transaction so that the stats message is sent in an
5648 : : * idle state.
5649 : : */
5650 : 84 : AbortOutOfAnyTransaction();
23 akapila@postgresql.o 5651 :GNC 84 : pgstat_report_subscription_error(MySubscription->oid);
5652 : :
1462 akapila@postgresql.o 5653 :CBC 84 : PG_RE_THROW();
5654 : : }
5655 : : }
1462 akapila@postgresql.o 5656 [ # # ]:UBC 0 : PG_END_TRY();
5657 : 0 : }
5658 : :
5659 : : /*
5660 : : * Runs the leader apply worker.
5661 : : *
5662 : : * It sets up replication origin, streaming options and then starts streaming.
5663 : : */
5664 : : static void
102 nathan@postgresql.or 5665 :GNC 279 : run_apply_worker(void)
5666 : : {
5667 : : char originname[NAMEDATALEN];
955 akapila@postgresql.o 5668 :CBC 279 : XLogRecPtr origin_startpos = InvalidXLogRecPtr;
5669 : 279 : char *slotname = NULL;
5670 : : WalRcvStreamOptions options;
5671 : : ReplOriginId originid;
5672 : : TimeLineID startpointTLI;
5673 : : char *err;
5674 : : bool must_use_password;
5675 : :
5676 : 279 : slotname = MySubscription->slotname;
5677 : :
5678 : : /*
5679 : : * This shouldn't happen if the subscription is enabled, but guard against
5680 : : * DDL bugs or manual catalog changes. (libpqwalreceiver will crash if
5681 : : * slot is NULL.)
5682 : : */
5683 [ - + ]: 279 : if (!slotname)
955 akapila@postgresql.o 5684 [ # # ]:UBC 0 : ereport(ERROR,
5685 : : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
5686 : : errmsg("subscription has no replication slot set")));
5687 : :
5688 : : /* Setup replication origin tracking. */
955 akapila@postgresql.o 5689 :CBC 279 : ReplicationOriginNameForLogicalRep(MySubscription->oid, InvalidOid,
5690 : : originname, sizeof(originname));
5691 : 279 : StartTransactionCommand();
5692 : 279 : originid = replorigin_by_name(originname, true);
5693 [ - + ]: 279 : if (!OidIsValid(originid))
955 akapila@postgresql.o 5694 :UBC 0 : originid = replorigin_create(originname);
955 akapila@postgresql.o 5695 :CBC 279 : replorigin_session_setup(originid, 0);
46 msawada@postgresql.o 5696 :GNC 279 : replorigin_xact_state.origin = originid;
955 akapila@postgresql.o 5697 :CBC 279 : origin_startpos = replorigin_session_get_progress(false);
880 5698 : 279 : CommitTransactionCommand();
5699 : :
5700 : : /* Is the use of a password mandatory? */
955 5701 [ + + ]: 533 : must_use_password = MySubscription->passwordrequired &&
880 5702 [ + + ]: 254 : !MySubscription->ownersuperuser;
5703 : :
955 5704 : 279 : LogRepWorkerWalRcvConn = walrcv_connect(MySubscription->conninfo, true,
5705 : : true, must_use_password,
5706 : : MySubscription->name, &err);
5707 : :
5708 [ + + ]: 273 : if (LogRepWorkerWalRcvConn == NULL)
5709 [ + - ]: 32 : ereport(ERROR,
5710 : : (errcode(ERRCODE_CONNECTION_FAILURE),
5711 : : errmsg("apply worker for subscription \"%s\" could not connect to the publisher: %s",
5712 : : MySubscription->name, err)));
5713 : :
5714 : : /*
5715 : : * We don't really use the output identify_system for anything but it does
5716 : : * some initializations on the upstream so let's still call it.
5717 : : */
5718 : 241 : (void) walrcv_identify_system(LogRepWorkerWalRcvConn, &startpointTLI);
5719 : :
5720 : 241 : set_apply_error_context_origin(originname);
5721 : :
5722 : 241 : set_stream_options(&options, slotname, &origin_startpos);
5723 : :
5724 : : /*
5725 : : * Even when the two_phase mode is requested by the user, it remains as
5726 : : * the tri-state PENDING until all tablesyncs have reached READY state.
5727 : : * Only then, can it become ENABLED.
5728 : : *
5729 : : * Note: If the subscription has no tables then leave the state as
5730 : : * PENDING, which allows ALTER SUBSCRIPTION ... REFRESH PUBLICATION to
5731 : : * work.
5732 : : */
5733 [ + + + + ]: 256 : if (MySubscription->twophasestate == LOGICALREP_TWOPHASE_STATE_PENDING &&
5734 : 15 : AllTablesyncsReady())
5735 : : {
5736 : : /* Start streaming with two_phase enabled */
5737 : 8 : options.proto.logical.twophase = true;
5738 : 8 : walrcv_startstreaming(LogRepWorkerWalRcvConn, &options);
5739 : :
5740 : 8 : StartTransactionCommand();
5741 : :
5742 : : /*
5743 : : * Updating pg_subscription might involve TOAST table access, so
5744 : : * ensure we have a valid snapshot.
5745 : : */
289 nathan@postgresql.or 5746 : 8 : PushActiveSnapshot(GetTransactionSnapshot());
5747 : :
955 akapila@postgresql.o 5748 : 8 : UpdateTwoPhaseState(MySubscription->oid, LOGICALREP_TWOPHASE_STATE_ENABLED);
5749 : 8 : MySubscription->twophasestate = LOGICALREP_TWOPHASE_STATE_ENABLED;
289 nathan@postgresql.or 5750 : 8 : PopActiveSnapshot();
955 akapila@postgresql.o 5751 : 8 : CommitTransactionCommand();
5752 : : }
5753 : : else
5754 : : {
5755 : 233 : walrcv_startstreaming(LogRepWorkerWalRcvConn, &options);
5756 : : }
5757 : :
5758 [ + + + + : 241 : ereport(DEBUG1,
+ - + - ]
5759 : : (errmsg_internal("logical replication apply worker for subscription \"%s\" two_phase is %s",
5760 : : MySubscription->name,
5761 : : MySubscription->twophasestate == LOGICALREP_TWOPHASE_STATE_DISABLED ? "DISABLED" :
5762 : : MySubscription->twophasestate == LOGICALREP_TWOPHASE_STATE_PENDING ? "PENDING" :
5763 : : MySubscription->twophasestate == LOGICALREP_TWOPHASE_STATE_ENABLED ? "ENABLED" :
5764 : : "?")));
5765 : :
5766 : : /* Run the main loop. */
5767 : 241 : start_apply(origin_startpos);
1462 akapila@postgresql.o 5768 :UBC 0 : }
5769 : :
5770 : : /*
5771 : : * Common initialization for leader apply worker, parallel apply worker,
5772 : : * tablesync worker and sequencesync worker.
5773 : : *
5774 : : * Initialize the database connection, in-memory subscription and necessary
5775 : : * config options.
5776 : : */
5777 : : void
955 akapila@postgresql.o 5778 :CBC 576 : InitializeLogRepWorker(void)
5779 : : {
5780 : : MemoryContext oldctx;
5781 : :
5782 : : /* Run as replica session replication role. */
3342 peter_e@gmx.net 5783 : 576 : SetConfigOption("session_replication_role", "replica",
5784 : : PGC_SUSET, PGC_S_OVERRIDE);
5785 : :
5786 : : /* Connect to our database. */
5787 : 576 : BackgroundWorkerInitializeConnectionByOid(MyLogicalRepWorker->dbid,
2901 magnus@hagander.net 5788 : 576 : MyLogicalRepWorker->userid,
5789 : : 0);
5790 : :
5791 : : /*
5792 : : * Set always-secure search path, so malicious users can't redirect user
5793 : : * code (e.g. pg_index.indexprs).
5794 : : */
2043 noah@leadboat.com 5795 : 573 : SetConfigOption("search_path", "", PGC_SUSET, PGC_S_OVERRIDE);
5796 : :
5797 : : /* Load the subscription into persistent memory context. */
3232 peter_e@gmx.net 5798 : 573 : ApplyContext = AllocSetContextCreate(TopMemoryContext,
5799 : : "ApplyContext",
5800 : : ALLOCSET_DEFAULT_SIZES);
3342 5801 : 573 : StartTransactionCommand();
3232 5802 : 573 : oldctx = MemoryContextSwitchTo(ApplyContext);
5803 : :
5804 : : /*
5805 : : * Lock the subscription to prevent it from being concurrently dropped,
5806 : : * then re-verify its existence. After the initialization, the worker will
5807 : : * be terminated gracefully if the subscription is dropped.
5808 : : */
208 akapila@postgresql.o 5809 : 573 : LockSharedObject(SubscriptionRelationId, MyLogicalRepWorker->subid, 0,
5810 : : AccessShareLock);
9 jdavis@postgresql.or 5811 :GNC 572 : MySubscription = GetSubscription(MyLogicalRepWorker->subid, true, true);
2900 peter_e@gmx.net 5812 [ + + ]:CBC 572 : if (!MySubscription)
5813 : : {
5814 [ + - ]: 65 : ereport(LOG,
5815 : : (errmsg("logical replication worker for subscription %u will not start because the subscription was removed during startup",
5816 : : MyLogicalRepWorker->subid)));
5817 : :
5818 : : /* Ensure we remove no-longer-useful entry for worker's start time */
954 akapila@postgresql.o 5819 [ + - ]: 65 : if (am_leader_apply_worker())
1148 tgl@sss.pgh.pa.us 5820 : 65 : ApplyLauncherForgetWorkerStartTime(MyLogicalRepWorker->subid);
5821 : :
2900 peter_e@gmx.net 5822 : 65 : proc_exit(0);
5823 : : }
5824 : :
3342 5825 : 507 : MySubscriptionValid = true;
5826 : 507 : MemoryContextSwitchTo(oldctx);
5827 : :
5828 [ - + ]: 507 : if (!MySubscription->enabled)
5829 : : {
3342 peter_e@gmx.net 5830 [ # # ]:UBC 0 : ereport(LOG,
5831 : : (errmsg("logical replication worker for subscription \"%s\" will not start because the subscription was disabled during startup",
5832 : : MySubscription->name)));
5833 : :
1161 akapila@postgresql.o 5834 : 0 : apply_worker_exit();
5835 : : }
5836 : :
5837 : : /*
5838 : : * Restart the worker if retain_dead_tuples was enabled during startup.
5839 : : *
5840 : : * At this point, the replication slot used for conflict detection might
5841 : : * not exist yet, or could be dropped soon if the launcher perceives
5842 : : * retain_dead_tuples as disabled. To avoid unnecessary tracking of
5843 : : * oldest_nonremovable_xid when the slot is absent or at risk of being
5844 : : * dropped, a restart is initiated.
5845 : : *
5846 : : * The oldest_nonremovable_xid should be initialized only when the
5847 : : * subscription's retention is active before launching the worker. See
5848 : : * logicalrep_worker_launch.
5849 : : */
235 akapila@postgresql.o 5850 [ + + ]:GNC 507 : if (am_leader_apply_worker() &&
5851 [ + + ]: 279 : MySubscription->retaindeadtuples &&
194 5852 [ + - ]: 16 : MySubscription->retentionactive &&
235 5853 [ - + ]: 16 : !TransactionIdIsValid(MyLogicalRepWorker->oldest_nonremovable_xid))
5854 : : {
235 akapila@postgresql.o 5855 [ # # ]:UNC 0 : ereport(LOG,
5856 : : errmsg("logical replication worker for subscription \"%s\" will restart because the option %s was enabled during startup",
5857 : : MySubscription->name, "retain_dead_tuples"));
5858 : :
5859 : 0 : apply_worker_exit();
5860 : : }
5861 : :
5862 : : /* Setup synchronous commit according to the user's wishes */
2900 peter_e@gmx.net 5863 :CBC 507 : SetConfigOption("synchronous_commit", MySubscription->synccommit,
5864 : : PGC_BACKEND, PGC_S_OVERRIDE);
5865 : :
5866 : : /* Change wal_receiver_timeout according to the user's wishes */
23 fujii@postgresql.org 5867 :GNC 507 : set_wal_receiver_timeout();
5868 : :
5869 : : /*
5870 : : * Keep us informed about subscription or role changes. Note that the
5871 : : * role's superuser privilege can be revoked.
5872 : : */
3342 peter_e@gmx.net 5873 :CBC 507 : CacheRegisterSyscacheCallback(SUBSCRIPTIONOID,
5874 : : subscription_change_cb,
5875 : : (Datum) 0);
5876 : : /* Changes to foreign servers may affect subscriptions using SERVER. */
9 jdavis@postgresql.or 5877 :GNC 507 : CacheRegisterSyscacheCallback(FOREIGNSERVEROID,
5878 : : subscription_change_cb,
5879 : : (Datum) 0);
5880 : : /* Changes to user mappings may affect subscriptions using SERVER. */
5881 : 507 : CacheRegisterSyscacheCallback(USERMAPPINGOID,
5882 : : subscription_change_cb,
5883 : : (Datum) 0);
5884 : :
5885 : : /*
5886 : : * Changes to FDW connection_function may affect subscriptions using
5887 : : * SERVER.
5888 : : */
5889 : 507 : CacheRegisterSyscacheCallback(FOREIGNDATAWRAPPEROID,
5890 : : subscription_change_cb,
5891 : : (Datum) 0);
5892 : :
880 akapila@postgresql.o 5893 :CBC 507 : CacheRegisterSyscacheCallback(AUTHOID,
5894 : : subscription_change_cb,
5895 : : (Datum) 0);
5896 : :
3279 peter_e@gmx.net 5897 [ + + ]: 507 : if (am_tablesync_worker())
3217 5898 [ + - ]: 207 : ereport(LOG,
5899 : : errmsg("logical replication table synchronization worker for subscription \"%s\", table \"%s\" has started",
5900 : : MySubscription->name,
5901 : : get_rel_name(MyLogicalRepWorker->relid)));
130 akapila@postgresql.o 5902 [ + + ]:GNC 300 : else if (am_sequencesync_worker())
5903 [ + - ]: 9 : ereport(LOG,
5904 : : errmsg("logical replication sequence synchronization worker for subscription \"%s\" has started",
5905 : : MySubscription->name));
5906 : : else
3217 peter_e@gmx.net 5907 [ + - ]:CBC 291 : ereport(LOG,
5908 : : errmsg("logical replication apply worker for subscription \"%s\" has started",
5909 : : MySubscription->name));
5910 : :
3342 5911 : 507 : CommitTransactionCommand();
5912 : :
5913 : : /*
5914 : : * Register a callback to reset the origin state before aborting any
5915 : : * pending transaction during shutdown (see ShutdownPostgres()). This will
5916 : : * avoid origin advancement for an incomplete transaction which could
5917 : : * otherwise lead to its loss as such a transaction won't be sent by the
5918 : : * server again.
5919 : : *
5920 : : * Note that even a LOG or DEBUG statement placed after setting the origin
5921 : : * state may process a shutdown signal before committing the current apply
5922 : : * operation. So, it is important to register such a callback here.
5923 : : *
5924 : : * Register this callback here to ensure that all types of logical
5925 : : * replication workers that set up origins and apply remote transactions
5926 : : * are protected.
5927 : : */
46 msawada@postgresql.o 5928 :GNC 507 : before_shmem_exit(on_exit_clear_xact_state, (Datum) 0);
1161 akapila@postgresql.o 5929 :CBC 507 : }
5930 : :
5931 : : /*
5932 : : * Callback on exit to clear transaction-level replication origin state.
5933 : : */
5934 : : static void
46 msawada@postgresql.o 5935 :GNC 507 : on_exit_clear_xact_state(int code, Datum arg)
5936 : : {
5937 : 507 : replorigin_xact_clear(true);
571 akapila@postgresql.o 5938 :CBC 507 : }
5939 : :
5940 : : /*
5941 : : * Common function to setup the leader apply, tablesync and sequencesync worker.
5942 : : */
5943 : : void
955 5944 : 564 : SetupApplyOrSyncWorker(int worker_slot)
5945 : : {
5946 : : /* Attach to slot */
1161 5947 : 564 : logicalrep_worker_attach(worker_slot);
5948 : :
130 akapila@postgresql.o 5949 [ + + + + :GNC 564 : Assert(am_tablesync_worker() || am_sequencesync_worker() || am_leader_apply_worker());
- + ]
5950 : :
5951 : : /* Setup signal handling */
1161 akapila@postgresql.o 5952 :CBC 564 : pqsignal(SIGHUP, SignalHandlerForConfigReload);
5953 : 564 : BackgroundWorkerUnblockSignals();
5954 : :
5955 : : /*
5956 : : * We don't currently need any ResourceOwner in a walreceiver process, but
5957 : : * if we did, we could call CreateAuxProcessResourceOwner here.
5958 : : */
5959 : :
5960 : : /* Initialise stats to a sanish value */
5961 : 564 : MyLogicalRepWorker->last_send_time = MyLogicalRepWorker->last_recv_time =
5962 : 564 : MyLogicalRepWorker->reply_time = GetCurrentTimestamp();
5963 : :
5964 : : /* Load the libpq-specific functions */
5965 : 564 : load_file("libpqwalreceiver", false);
5966 : :
955 5967 : 564 : InitializeLogRepWorker();
5968 : :
5969 : : /* Connect to the origin and start the replication. */
3342 peter_e@gmx.net 5970 [ + + ]: 495 : elog(DEBUG1, "connecting to publisher using connection string \"%s\"",
5971 : : MySubscription->conninfo);
5972 : :
5973 : : /*
5974 : : * Setup callback for syscache so that we know when something changes in
5975 : : * the subscription relation state.
5976 : : */
3279 5977 : 495 : CacheRegisterSyscacheCallback(SUBSCRIPTIONRELMAP,
5978 : : InvalidateSyncingRelStates,
5979 : : (Datum) 0);
955 akapila@postgresql.o 5980 : 495 : }
5981 : :
5982 : : /* Logical Replication Apply worker entry point */
5983 : : void
5984 : 347 : ApplyWorkerMain(Datum main_arg)
5985 : : {
5986 : 347 : int worker_slot = DatumGetInt32(main_arg);
5987 : :
5988 : 347 : InitializingApplyWorker = true;
5989 : :
5990 : 347 : SetupApplyOrSyncWorker(worker_slot);
5991 : :
5992 : 279 : InitializingApplyWorker = false;
5993 : :
5994 : 279 : run_apply_worker();
5995 : :
1462 akapila@postgresql.o 5996 :UBC 0 : proc_exit(0);
5997 : : }
5998 : :
5999 : : /*
6000 : : * After error recovery, disable the subscription in a new transaction
6001 : : * and exit cleanly.
6002 : : */
6003 : : void
1462 akapila@postgresql.o 6004 :CBC 4 : DisableSubscriptionAndExit(void)
6005 : : {
6006 : : /*
6007 : : * Emit the error message, and recover from the error state to an idle
6008 : : * state
6009 : : */
6010 : 4 : HOLD_INTERRUPTS();
6011 : :
6012 : 4 : EmitErrorReport();
6013 : 4 : AbortOutOfAnyTransaction();
6014 : 4 : FlushErrorState();
6015 : :
6016 [ - + ]: 4 : RESUME_INTERRUPTS();
6017 : :
6018 : : /*
6019 : : * Report the worker failed during sequence synchronization, table
6020 : : * synchronization, or apply.
6021 : : */
23 akapila@postgresql.o 6022 :GNC 4 : pgstat_report_subscription_error(MyLogicalRepWorker->subid);
6023 : :
6024 : : /* Disable the subscription */
1462 akapila@postgresql.o 6025 :CBC 4 : StartTransactionCommand();
6026 : :
6027 : : /*
6028 : : * Updating pg_subscription might involve TOAST table access, so ensure we
6029 : : * have a valid snapshot.
6030 : : */
289 nathan@postgresql.or 6031 : 4 : PushActiveSnapshot(GetTransactionSnapshot());
6032 : :
1462 akapila@postgresql.o 6033 : 4 : DisableSubscription(MySubscription->oid);
289 nathan@postgresql.or 6034 : 4 : PopActiveSnapshot();
1462 akapila@postgresql.o 6035 : 4 : CommitTransactionCommand();
6036 : :
6037 : : /* Ensure we remove no-longer-useful entry for worker's start time */
954 6038 [ + + ]: 4 : if (am_leader_apply_worker())
1148 tgl@sss.pgh.pa.us 6039 : 3 : ApplyLauncherForgetWorkerStartTime(MyLogicalRepWorker->subid);
6040 : :
6041 : : /* Notify the subscription has been disabled and exit */
1462 akapila@postgresql.o 6042 [ + - ]: 4 : ereport(LOG,
6043 : : errmsg("subscription \"%s\" has been disabled because of an error",
6044 : : MySubscription->name));
6045 : :
6046 : : /*
6047 : : * Skip the track_commit_timestamp check when disabling the worker due to
6048 : : * an error, as verifying commit timestamps is unnecessary in this
6049 : : * context.
6050 : : */
194 akapila@postgresql.o 6051 :GNC 4 : CheckSubDeadTupleRetention(false, true, WARNING,
6052 : 4 : MySubscription->retaindeadtuples,
6053 : 4 : MySubscription->retentionactive, false);
6054 : :
3342 peter_e@gmx.net 6055 :CBC 4 : proc_exit(0);
6056 : : }
6057 : :
6058 : : /*
6059 : : * Is current process a logical replication worker?
6060 : : */
6061 : : bool
3208 6062 : 2184 : IsLogicalWorker(void)
6063 : : {
6064 : 2184 : return MyLogicalRepWorker != NULL;
6065 : : }
6066 : :
6067 : : /*
6068 : : * Is current process a logical replication parallel apply worker?
6069 : : */
6070 : : bool
1161 akapila@postgresql.o 6071 : 1502 : IsLogicalParallelApplyWorker(void)
6072 : : {
6073 [ + + + - ]: 1502 : return IsLogicalWorker() && am_parallel_apply_worker();
6074 : : }
6075 : :
6076 : : /*
6077 : : * Start skipping changes of the transaction if the given LSN matches the
6078 : : * LSN specified by subscription's skiplsn.
6079 : : */
6080 : : static void
1454 6081 : 542 : maybe_start_skipping_changes(XLogRecPtr finish_lsn)
6082 : : {
6083 [ - + ]: 542 : Assert(!is_skipping_changes());
6084 [ - + ]: 542 : Assert(!in_remote_transaction);
6085 [ - + ]: 542 : Assert(!in_streamed_transaction);
6086 : :
6087 : : /*
6088 : : * Quick return if it's not requested to skip this transaction. This
6089 : : * function is called for every remote transaction and we assume that
6090 : : * skipping the transaction is not used often.
6091 : : */
129 alvherre@kurilemu.de 6092 [ + + - + :GNC 542 : if (likely(!XLogRecPtrIsValid(MySubscription->skiplsn) ||
+ + ]
6093 : : MySubscription->skiplsn != finish_lsn))
1454 akapila@postgresql.o 6094 :CBC 539 : return;
6095 : :
6096 : : /* Start skipping all changes of this transaction */
6097 : 3 : skip_xact_finish_lsn = finish_lsn;
6098 : :
6099 [ + - ]: 3 : ereport(LOG,
6100 : : errmsg("logical replication starts skipping transaction at LSN %X/%08X",
6101 : : LSN_FORMAT_ARGS(skip_xact_finish_lsn)));
6102 : : }
6103 : :
6104 : : /*
6105 : : * Stop skipping changes by resetting skip_xact_finish_lsn if enabled.
6106 : : */
6107 : : static void
6108 : 30 : stop_skipping_changes(void)
6109 : : {
6110 [ + + ]: 30 : if (!is_skipping_changes())
6111 : 27 : return;
6112 : :
6113 [ + - ]: 3 : ereport(LOG,
6114 : : errmsg("logical replication completed skipping transaction at LSN %X/%08X",
6115 : : LSN_FORMAT_ARGS(skip_xact_finish_lsn)));
6116 : :
6117 : : /* Stop skipping changes */
6118 : 3 : skip_xact_finish_lsn = InvalidXLogRecPtr;
6119 : : }
6120 : :
6121 : : /*
6122 : : * Clear subskiplsn of pg_subscription catalog.
6123 : : *
6124 : : * finish_lsn is the transaction's finish LSN that is used to check if the
6125 : : * subskiplsn matches it. If not matched, we raise a warning when clearing the
6126 : : * subskiplsn in order to inform users for cases e.g., where the user mistakenly
6127 : : * specified the wrong subskiplsn.
6128 : : */
6129 : : static void
6130 : 537 : clear_subscription_skip_lsn(XLogRecPtr finish_lsn)
6131 : : {
6132 : : Relation rel;
6133 : : Form_pg_subscription subform;
6134 : : HeapTuple tup;
6135 : 537 : XLogRecPtr myskiplsn = MySubscription->skiplsn;
6136 : 537 : bool started_tx = false;
6137 : :
129 alvherre@kurilemu.de 6138 [ + + - + ]:GNC 537 : if (likely(!XLogRecPtrIsValid(myskiplsn)) || am_parallel_apply_worker())
1454 akapila@postgresql.o 6139 :CBC 534 : return;
6140 : :
6141 [ + + ]: 3 : if (!IsTransactionState())
6142 : : {
6143 : 1 : StartTransactionCommand();
6144 : 1 : started_tx = true;
6145 : : }
6146 : :
6147 : : /*
6148 : : * Updating pg_subscription might involve TOAST table access, so ensure we
6149 : : * have a valid snapshot.
6150 : : */
289 nathan@postgresql.or 6151 : 3 : PushActiveSnapshot(GetTransactionSnapshot());
6152 : :
6153 : : /*
6154 : : * Protect subskiplsn of pg_subscription from being concurrently updated
6155 : : * while clearing it.
6156 : : */
1454 akapila@postgresql.o 6157 : 3 : LockSharedObject(SubscriptionRelationId, MySubscription->oid, 0,
6158 : : AccessShareLock);
6159 : :
6160 : 3 : rel = table_open(SubscriptionRelationId, RowExclusiveLock);
6161 : :
6162 : : /* Fetch the existing tuple. */
6163 : 3 : tup = SearchSysCacheCopy1(SUBSCRIPTIONOID,
6164 : : ObjectIdGetDatum(MySubscription->oid));
6165 : :
6166 [ - + ]: 3 : if (!HeapTupleIsValid(tup))
1454 akapila@postgresql.o 6167 [ # # ]:UBC 0 : elog(ERROR, "subscription \"%s\" does not exist", MySubscription->name);
6168 : :
1454 akapila@postgresql.o 6169 :CBC 3 : subform = (Form_pg_subscription) GETSTRUCT(tup);
6170 : :
6171 : : /*
6172 : : * Clear the subskiplsn. If the user has already changed subskiplsn before
6173 : : * clearing it we don't update the catalog and the replication origin
6174 : : * state won't get advanced. So in the worst case, if the server crashes
6175 : : * before sending an acknowledgment of the flush position the transaction
6176 : : * will be sent again and the user needs to set subskiplsn again. We can
6177 : : * reduce the possibility by logging a replication origin WAL record to
6178 : : * advance the origin LSN instead but there is no way to advance the
6179 : : * origin timestamp and it doesn't seem to be worth doing anything about
6180 : : * it since it's a very rare case.
6181 : : */
6182 [ + - ]: 3 : if (subform->subskiplsn == myskiplsn)
6183 : : {
6184 : : bool nulls[Natts_pg_subscription];
6185 : : bool replaces[Natts_pg_subscription];
6186 : : Datum values[Natts_pg_subscription];
6187 : :
6188 : 3 : memset(values, 0, sizeof(values));
6189 : 3 : memset(nulls, false, sizeof(nulls));
6190 : 3 : memset(replaces, false, sizeof(replaces));
6191 : :
6192 : : /* reset subskiplsn */
6193 : 3 : values[Anum_pg_subscription_subskiplsn - 1] = LSNGetDatum(InvalidXLogRecPtr);
6194 : 3 : replaces[Anum_pg_subscription_subskiplsn - 1] = true;
6195 : :
6196 : 3 : tup = heap_modify_tuple(tup, RelationGetDescr(rel), values, nulls,
6197 : : replaces);
6198 : 3 : CatalogTupleUpdate(rel, &tup->t_self, tup);
6199 : :
6200 [ - + ]: 3 : if (myskiplsn != finish_lsn)
1454 akapila@postgresql.o 6201 [ # # ]:UBC 0 : ereport(WARNING,
6202 : : errmsg("skip-LSN of subscription \"%s\" cleared", MySubscription->name),
6203 : : errdetail("Remote transaction's finish WAL location (LSN) %X/%08X did not match skip-LSN %X/%08X.",
6204 : : LSN_FORMAT_ARGS(finish_lsn),
6205 : : LSN_FORMAT_ARGS(myskiplsn)));
6206 : : }
6207 : :
1454 akapila@postgresql.o 6208 :CBC 3 : heap_freetuple(tup);
6209 : 3 : table_close(rel, NoLock);
6210 : :
289 nathan@postgresql.or 6211 : 3 : PopActiveSnapshot();
6212 : :
1454 akapila@postgresql.o 6213 [ + + ]: 3 : if (started_tx)
6214 : 1 : CommitTransactionCommand();
6215 : : }
6216 : :
6217 : : /* Error callback to give more context info about the change being applied */
6218 : : void
1661 6219 : 3656 : apply_error_callback(void *arg)
6220 : : {
6221 : 3656 : ApplyErrorCallbackArg *errarg = &apply_error_callback_arg;
6222 : :
6223 [ + + ]: 3656 : if (apply_error_callback_arg.command == 0)
6224 : 3021 : return;
6225 : :
1468 6226 [ - + ]: 635 : Assert(errarg->origin_name);
6227 : :
1469 6228 [ + + ]: 635 : if (errarg->rel == NULL)
6229 : : {
6230 [ - + ]: 333 : if (!TransactionIdIsValid(errarg->remote_xid))
1268 peter@eisentraut.org 6231 :UBC 0 : errcontext("processing remote data for replication origin \"%s\" during message type \"%s\"",
6232 : : errarg->origin_name,
6233 : : logicalrep_message_type(errarg->command));
129 alvherre@kurilemu.de 6234 [ + + ]:GNC 333 : else if (!XLogRecPtrIsValid(errarg->finish_lsn))
1268 peter@eisentraut.org 6235 :CBC 260 : errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" in transaction %u",
6236 : : errarg->origin_name,
6237 : : logicalrep_message_type(errarg->command),
6238 : : errarg->remote_xid);
6239 : : else
251 alvherre@kurilemu.de 6240 :GNC 146 : errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" in transaction %u, finished at %X/%08X",
6241 : : errarg->origin_name,
6242 : : logicalrep_message_type(errarg->command),
6243 : : errarg->remote_xid,
1468 akapila@postgresql.o 6244 :CBC 73 : LSN_FORMAT_ARGS(errarg->finish_lsn));
6245 : : }
6246 : : else
6247 : : {
1161 6248 [ + - ]: 302 : if (errarg->remote_attnum < 0)
6249 : : {
129 alvherre@kurilemu.de 6250 [ + + ]:GNC 302 : if (!XLogRecPtrIsValid(errarg->finish_lsn))
1161 akapila@postgresql.o 6251 :GBC 446 : errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" in transaction %u",
6252 : : errarg->origin_name,
6253 : : logicalrep_message_type(errarg->command),
6254 : 223 : errarg->rel->remoterel.nspname,
6255 : 223 : errarg->rel->remoterel.relname,
6256 : : errarg->remote_xid);
6257 : : else
251 alvherre@kurilemu.de 6258 :GNC 158 : errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" in transaction %u, finished at %X/%08X",
6259 : : errarg->origin_name,
6260 : : logicalrep_message_type(errarg->command),
1161 akapila@postgresql.o 6261 :CBC 79 : errarg->rel->remoterel.nspname,
6262 : 79 : errarg->rel->remoterel.relname,
6263 : : errarg->remote_xid,
6264 : 79 : LSN_FORMAT_ARGS(errarg->finish_lsn));
6265 : : }
6266 : : else
6267 : : {
129 alvherre@kurilemu.de 6268 [ # # ]:UNC 0 : if (!XLogRecPtrIsValid(errarg->finish_lsn))
1161 akapila@postgresql.o 6269 :UBC 0 : errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" column \"%s\" in transaction %u",
6270 : : errarg->origin_name,
6271 : : logicalrep_message_type(errarg->command),
6272 : 0 : errarg->rel->remoterel.nspname,
6273 : 0 : errarg->rel->remoterel.relname,
6274 : 0 : errarg->rel->remoterel.attnames[errarg->remote_attnum],
6275 : : errarg->remote_xid);
6276 : : else
251 alvherre@kurilemu.de 6277 :UNC 0 : errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" column \"%s\" in transaction %u, finished at %X/%08X",
6278 : : errarg->origin_name,
6279 : : logicalrep_message_type(errarg->command),
1161 akapila@postgresql.o 6280 :UBC 0 : errarg->rel->remoterel.nspname,
6281 : 0 : errarg->rel->remoterel.relname,
6282 : 0 : errarg->rel->remoterel.attnames[errarg->remote_attnum],
6283 : : errarg->remote_xid,
6284 : 0 : LSN_FORMAT_ARGS(errarg->finish_lsn));
6285 : : }
6286 : : }
6287 : : }
6288 : :
6289 : : /* Set transaction information of apply error callback */
6290 : : static inline void
1468 akapila@postgresql.o 6291 :CBC 2933 : set_apply_error_context_xact(TransactionId xid, XLogRecPtr lsn)
6292 : : {
1661 6293 : 2933 : apply_error_callback_arg.remote_xid = xid;
1468 6294 : 2933 : apply_error_callback_arg.finish_lsn = lsn;
1661 6295 : 2933 : }
6296 : :
6297 : : /* Reset all information of apply error callback */
6298 : : static inline void
6299 : 1434 : reset_apply_error_context_info(void)
6300 : : {
6301 : 1434 : apply_error_callback_arg.command = 0;
6302 : 1434 : apply_error_callback_arg.rel = NULL;
6303 : 1434 : apply_error_callback_arg.remote_attnum = -1;
1468 6304 : 1434 : set_apply_error_context_xact(InvalidTransactionId, InvalidXLogRecPtr);
1661 6305 : 1434 : }
6306 : :
6307 : : /*
6308 : : * Request wakeup of the workers for the given subscription OID
6309 : : * at commit of the current transaction.
6310 : : *
6311 : : * This is used to ensure that the workers process assorted changes
6312 : : * as soon as possible.
6313 : : */
6314 : : void
1164 tgl@sss.pgh.pa.us 6315 : 234 : LogicalRepWorkersWakeupAtCommit(Oid subid)
6316 : : {
6317 : : MemoryContext oldcxt;
6318 : :
6319 : 234 : oldcxt = MemoryContextSwitchTo(TopTransactionContext);
6320 : 234 : on_commit_wakeup_workers_subids =
6321 : 234 : list_append_unique_oid(on_commit_wakeup_workers_subids, subid);
6322 : 234 : MemoryContextSwitchTo(oldcxt);
6323 : 234 : }
6324 : :
6325 : : /*
6326 : : * Wake up the workers of any subscriptions that were changed in this xact.
6327 : : */
6328 : : void
6329 : 337758 : AtEOXact_LogicalRepWorkers(bool isCommit)
6330 : : {
6331 [ + + + + ]: 337758 : if (isCommit && on_commit_wakeup_workers_subids != NIL)
6332 : : {
6333 : : ListCell *lc;
6334 : :
6335 : 229 : LWLockAcquire(LogicalRepWorkerLock, LW_SHARED);
6336 [ + - + + : 458 : foreach(lc, on_commit_wakeup_workers_subids)
+ + ]
6337 : : {
6338 : 229 : Oid subid = lfirst_oid(lc);
6339 : : List *workers;
6340 : : ListCell *lc2;
6341 : :
599 akapila@postgresql.o 6342 : 229 : workers = logicalrep_workers_find(subid, true, false);
1164 tgl@sss.pgh.pa.us 6343 [ + + + + : 299 : foreach(lc2, workers)
+ + ]
6344 : : {
6345 : 70 : LogicalRepWorker *worker = (LogicalRepWorker *) lfirst(lc2);
6346 : :
6347 : 70 : logicalrep_worker_wakeup_ptr(worker);
6348 : : }
6349 : : }
6350 : 229 : LWLockRelease(LogicalRepWorkerLock);
6351 : : }
6352 : :
6353 : : /* The List storage will be reclaimed automatically in xact cleanup. */
6354 : 337758 : on_commit_wakeup_workers_subids = NIL;
6355 : 337758 : }
6356 : :
6357 : : /*
6358 : : * Allocate the origin name in long-lived context for error context message.
6359 : : */
6360 : : void
1161 akapila@postgresql.o 6361 : 446 : set_apply_error_context_origin(char *originname)
6362 : : {
6363 : 446 : apply_error_callback_arg.origin_name = MemoryContextStrdup(ApplyContext,
6364 : : originname);
6365 : 446 : }
6366 : :
6367 : : /*
6368 : : * Return the action to be taken for the given transaction. See
6369 : : * TransApplyAction for information on each of the actions.
6370 : : *
6371 : : * *winfo is assigned to the destination parallel worker info when the leader
6372 : : * apply worker has to pass all the transaction's changes to the parallel
6373 : : * apply worker.
6374 : : */
6375 : : static TransApplyAction
6376 : 326510 : get_transaction_apply_action(TransactionId xid, ParallelApplyWorkerInfo **winfo)
6377 : : {
6378 : 326510 : *winfo = NULL;
6379 : :
6380 [ + + ]: 326510 : if (am_parallel_apply_worker())
6381 : : {
6382 : 69076 : return TRANS_PARALLEL_APPLY;
6383 : : }
6384 : :
6385 : : /*
6386 : : * If we are processing this transaction using a parallel apply worker
6387 : : * then either we send the changes to the parallel worker or if the worker
6388 : : * is busy then serialize the changes to the file which will later be
6389 : : * processed by the parallel worker.
6390 : : */
6391 : 257434 : *winfo = pa_find_worker(xid);
6392 : :
1153 6393 [ + + + + ]: 257434 : if (*winfo && (*winfo)->serialize_changes)
6394 : : {
6395 : 5037 : return TRANS_LEADER_PARTIAL_SERIALIZE;
6396 : : }
6397 [ + + ]: 252397 : else if (*winfo)
6398 : : {
6399 : 68906 : return TRANS_LEADER_SEND_TO_PARALLEL;
6400 : : }
6401 : :
6402 : : /*
6403 : : * If there is no parallel worker involved to process this transaction
6404 : : * then we either directly apply the change or serialize it to a file
6405 : : * which will later be applied when the transaction finish message is
6406 : : * processed.
6407 : : */
6408 [ + + ]: 183491 : else if (in_streamed_transaction)
6409 : : {
6410 : 103199 : return TRANS_LEADER_SERIALIZE;
6411 : : }
6412 : : else
6413 : : {
6414 : 80292 : return TRANS_LEADER_APPLY;
6415 : : }
6416 : : }
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