Line data Source code
1 : /*-------------------------------------------------------------------------
2 : * worker.c
3 : * PostgreSQL logical replication worker (apply)
4 : *
5 : * Copyright (c) 2016-2024, 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 : * process_syncing_tables_for_apply.
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 : * We don't allow to toggle two_phase option of a subscription because it can
113 : * lead to an inconsistent replica. Consider, initially, it was on and we have
114 : * received some prepare then we turn it off, now at commit time the server
115 : * will send the entire transaction data along with the commit. With some more
116 : * analysis, we can allow changing this option from off to on but not sure if
117 : * that alone would be useful.
118 : *
119 : * Finally, to avoid problems mentioned in previous paragraphs from any
120 : * subsequent (not READY) tablesyncs (need to toggle two_phase option from 'on'
121 : * to 'off' and then again back to 'on') there is a restriction for
122 : * ALTER SUBSCRIPTION REFRESH PUBLICATION. This command is not permitted when
123 : * the two_phase tri-state is ENABLED, except when copy_data = false.
124 : *
125 : * We can get prepare of the same GID more than once for the genuine cases
126 : * where we have defined multiple subscriptions for publications on the same
127 : * server and prepared transaction has operations on tables subscribed to those
128 : * subscriptions. For such cases, if we use the GID sent by publisher one of
129 : * the prepares will be successful and others will fail, in which case the
130 : * server will send them again. Now, this can lead to a deadlock if user has
131 : * set synchronous_standby_names for all the subscriptions on subscriber. To
132 : * avoid such deadlocks, we generate a unique GID (consisting of the
133 : * subscription oid and the xid of the prepared transaction) for each prepare
134 : * transaction on the subscriber.
135 : *
136 : * FAILOVER
137 : * ----------------------
138 : * The logical slot on the primary can be synced to the standby by specifying
139 : * failover = true when creating the subscription. Enabling failover allows us
140 : * to smoothly transition to the promoted standby, ensuring that we can
141 : * subscribe to the new primary without losing any data.
142 : *-------------------------------------------------------------------------
143 : */
144 :
145 : #include "postgres.h"
146 :
147 : #include <sys/stat.h>
148 : #include <unistd.h>
149 :
150 : #include "access/table.h"
151 : #include "access/tableam.h"
152 : #include "access/twophase.h"
153 : #include "access/xact.h"
154 : #include "catalog/indexing.h"
155 : #include "catalog/pg_inherits.h"
156 : #include "catalog/pg_subscription.h"
157 : #include "catalog/pg_subscription_rel.h"
158 : #include "commands/tablecmds.h"
159 : #include "commands/trigger.h"
160 : #include "executor/executor.h"
161 : #include "executor/execPartition.h"
162 : #include "libpq/pqformat.h"
163 : #include "miscadmin.h"
164 : #include "optimizer/optimizer.h"
165 : #include "parser/parse_relation.h"
166 : #include "pgstat.h"
167 : #include "postmaster/bgworker.h"
168 : #include "postmaster/interrupt.h"
169 : #include "postmaster/walwriter.h"
170 : #include "replication/logicallauncher.h"
171 : #include "replication/logicalproto.h"
172 : #include "replication/logicalrelation.h"
173 : #include "replication/logicalworker.h"
174 : #include "replication/origin.h"
175 : #include "replication/walreceiver.h"
176 : #include "replication/worker_internal.h"
177 : #include "rewrite/rewriteHandler.h"
178 : #include "storage/buffile.h"
179 : #include "storage/ipc.h"
180 : #include "storage/lmgr.h"
181 : #include "tcop/tcopprot.h"
182 : #include "utils/acl.h"
183 : #include "utils/dynahash.h"
184 : #include "utils/guc.h"
185 : #include "utils/inval.h"
186 : #include "utils/lsyscache.h"
187 : #include "utils/memutils.h"
188 : #include "utils/pg_lsn.h"
189 : #include "utils/rel.h"
190 : #include "utils/rls.h"
191 : #include "utils/snapmgr.h"
192 : #include "utils/syscache.h"
193 : #include "utils/usercontext.h"
194 :
195 : #define NAPTIME_PER_CYCLE 1000 /* max sleep time between cycles (1s) */
196 :
197 : typedef struct FlushPosition
198 : {
199 : dlist_node node;
200 : XLogRecPtr local_end;
201 : XLogRecPtr remote_end;
202 : } FlushPosition;
203 :
204 : static dlist_head lsn_mapping = DLIST_STATIC_INIT(lsn_mapping);
205 :
206 : typedef struct ApplyExecutionData
207 : {
208 : EState *estate; /* executor state, used to track resources */
209 :
210 : LogicalRepRelMapEntry *targetRel; /* replication target rel */
211 : ResultRelInfo *targetRelInfo; /* ResultRelInfo for same */
212 :
213 : /* These fields are used when the target relation is partitioned: */
214 : ModifyTableState *mtstate; /* dummy ModifyTable state */
215 : PartitionTupleRouting *proute; /* partition routing info */
216 : } ApplyExecutionData;
217 :
218 : /* Struct for saving and restoring apply errcontext information */
219 : typedef struct ApplyErrorCallbackArg
220 : {
221 : LogicalRepMsgType command; /* 0 if invalid */
222 : LogicalRepRelMapEntry *rel;
223 :
224 : /* Remote node information */
225 : int remote_attnum; /* -1 if invalid */
226 : TransactionId remote_xid;
227 : XLogRecPtr finish_lsn;
228 : char *origin_name;
229 : } ApplyErrorCallbackArg;
230 :
231 : /*
232 : * The action to be taken for the changes in the transaction.
233 : *
234 : * TRANS_LEADER_APPLY:
235 : * This action means that we are in the leader apply worker or table sync
236 : * worker. The changes of the transaction are either directly applied or
237 : * are read from temporary files (for streaming transactions) and then
238 : * applied by the worker.
239 : *
240 : * TRANS_LEADER_SERIALIZE:
241 : * This action means that we are in the leader apply worker or table sync
242 : * worker. Changes are written to temporary files and then applied when the
243 : * final commit arrives.
244 : *
245 : * TRANS_LEADER_SEND_TO_PARALLEL:
246 : * This action means that we are in the leader apply worker and need to send
247 : * the changes to the parallel apply worker.
248 : *
249 : * TRANS_LEADER_PARTIAL_SERIALIZE:
250 : * This action means that we are in the leader apply worker and have sent some
251 : * changes directly to the parallel apply worker and the remaining changes are
252 : * serialized to a file, due to timeout while sending data. The parallel apply
253 : * worker will apply these serialized changes when the final commit arrives.
254 : *
255 : * We can't use TRANS_LEADER_SERIALIZE for this case because, in addition to
256 : * serializing changes, the leader worker also needs to serialize the
257 : * STREAM_XXX message to a file, and wait for the parallel apply worker to
258 : * finish the transaction when processing the transaction finish command. So
259 : * this new action was introduced to keep the code and logic clear.
260 : *
261 : * TRANS_PARALLEL_APPLY:
262 : * This action means that we are in the parallel apply worker and changes of
263 : * the transaction are applied directly by the worker.
264 : */
265 : typedef enum
266 : {
267 : /* The action for non-streaming transactions. */
268 : TRANS_LEADER_APPLY,
269 :
270 : /* Actions for streaming transactions. */
271 : TRANS_LEADER_SERIALIZE,
272 : TRANS_LEADER_SEND_TO_PARALLEL,
273 : TRANS_LEADER_PARTIAL_SERIALIZE,
274 : TRANS_PARALLEL_APPLY,
275 : } TransApplyAction;
276 :
277 : /* errcontext tracker */
278 : ApplyErrorCallbackArg apply_error_callback_arg =
279 : {
280 : .command = 0,
281 : .rel = NULL,
282 : .remote_attnum = -1,
283 : .remote_xid = InvalidTransactionId,
284 : .finish_lsn = InvalidXLogRecPtr,
285 : .origin_name = NULL,
286 : };
287 :
288 : ErrorContextCallback *apply_error_context_stack = NULL;
289 :
290 : MemoryContext ApplyMessageContext = NULL;
291 : MemoryContext ApplyContext = NULL;
292 :
293 : /* per stream context for streaming transactions */
294 : static MemoryContext LogicalStreamingContext = NULL;
295 :
296 : WalReceiverConn *LogRepWorkerWalRcvConn = NULL;
297 :
298 : Subscription *MySubscription = NULL;
299 : static bool MySubscriptionValid = false;
300 :
301 : static List *on_commit_wakeup_workers_subids = NIL;
302 :
303 : bool in_remote_transaction = false;
304 : static XLogRecPtr remote_final_lsn = InvalidXLogRecPtr;
305 :
306 : /* fields valid only when processing streamed transaction */
307 : static bool in_streamed_transaction = false;
308 :
309 : static TransactionId stream_xid = InvalidTransactionId;
310 :
311 : /*
312 : * The number of changes applied by parallel apply worker during one streaming
313 : * block.
314 : */
315 : static uint32 parallel_stream_nchanges = 0;
316 :
317 : /* Are we initializing an apply worker? */
318 : bool InitializingApplyWorker = false;
319 :
320 : /*
321 : * We enable skipping all data modification changes (INSERT, UPDATE, etc.) for
322 : * the subscription if the remote transaction's finish LSN matches the subskiplsn.
323 : * Once we start skipping changes, we don't stop it until we skip all changes of
324 : * the transaction even if pg_subscription is updated and MySubscription->skiplsn
325 : * gets changed or reset during that. Also, in streaming transaction cases (streaming = on),
326 : * we don't skip receiving and spooling the changes since we decide whether or not
327 : * to skip applying the changes when starting to apply changes. The subskiplsn is
328 : * cleared after successfully skipping the transaction or applying non-empty
329 : * transaction. The latter prevents the mistakenly specified subskiplsn from
330 : * being left. Note that we cannot skip the streaming transactions when using
331 : * parallel apply workers because we cannot get the finish LSN before applying
332 : * the changes. So, we don't start parallel apply worker when finish LSN is set
333 : * by the user.
334 : */
335 : static XLogRecPtr skip_xact_finish_lsn = InvalidXLogRecPtr;
336 : #define is_skipping_changes() (unlikely(!XLogRecPtrIsInvalid(skip_xact_finish_lsn)))
337 :
338 : /* BufFile handle of the current streaming file */
339 : static BufFile *stream_fd = NULL;
340 :
341 : typedef struct SubXactInfo
342 : {
343 : TransactionId xid; /* XID of the subxact */
344 : int fileno; /* file number in the buffile */
345 : off_t offset; /* offset in the file */
346 : } SubXactInfo;
347 :
348 : /* Sub-transaction data for the current streaming transaction */
349 : typedef struct ApplySubXactData
350 : {
351 : uint32 nsubxacts; /* number of sub-transactions */
352 : uint32 nsubxacts_max; /* current capacity of subxacts */
353 : TransactionId subxact_last; /* xid of the last sub-transaction */
354 : SubXactInfo *subxacts; /* sub-xact offset in changes file */
355 : } ApplySubXactData;
356 :
357 : static ApplySubXactData subxact_data = {0, 0, InvalidTransactionId, NULL};
358 :
359 : static inline void subxact_filename(char *path, Oid subid, TransactionId xid);
360 : static inline void changes_filename(char *path, Oid subid, TransactionId xid);
361 :
362 : /*
363 : * Information about subtransactions of a given toplevel transaction.
364 : */
365 : static void subxact_info_write(Oid subid, TransactionId xid);
366 : static void subxact_info_read(Oid subid, TransactionId xid);
367 : static void subxact_info_add(TransactionId xid);
368 : static inline void cleanup_subxact_info(void);
369 :
370 : /*
371 : * Serialize and deserialize changes for a toplevel transaction.
372 : */
373 : static void stream_open_file(Oid subid, TransactionId xid,
374 : bool first_segment);
375 : static void stream_write_change(char action, StringInfo s);
376 : static void stream_open_and_write_change(TransactionId xid, char action, StringInfo s);
377 : static void stream_close_file(void);
378 :
379 : static void send_feedback(XLogRecPtr recvpos, bool force, bool requestReply);
380 :
381 : static void apply_handle_commit_internal(LogicalRepCommitData *commit_data);
382 : static void apply_handle_insert_internal(ApplyExecutionData *edata,
383 : ResultRelInfo *relinfo,
384 : TupleTableSlot *remoteslot);
385 : static void apply_handle_update_internal(ApplyExecutionData *edata,
386 : ResultRelInfo *relinfo,
387 : TupleTableSlot *remoteslot,
388 : LogicalRepTupleData *newtup,
389 : Oid localindexoid);
390 : static void apply_handle_delete_internal(ApplyExecutionData *edata,
391 : ResultRelInfo *relinfo,
392 : TupleTableSlot *remoteslot,
393 : Oid localindexoid);
394 : static bool FindReplTupleInLocalRel(ApplyExecutionData *edata, Relation localrel,
395 : LogicalRepRelation *remoterel,
396 : Oid localidxoid,
397 : TupleTableSlot *remoteslot,
398 : TupleTableSlot **localslot);
399 : static void apply_handle_tuple_routing(ApplyExecutionData *edata,
400 : TupleTableSlot *remoteslot,
401 : LogicalRepTupleData *newtup,
402 : CmdType operation);
403 :
404 : /* Compute GID for two_phase transactions */
405 : static void TwoPhaseTransactionGid(Oid subid, TransactionId xid, char *gid, int szgid);
406 :
407 : /* Functions for skipping changes */
408 : static void maybe_start_skipping_changes(XLogRecPtr finish_lsn);
409 : static void stop_skipping_changes(void);
410 : static void clear_subscription_skip_lsn(XLogRecPtr finish_lsn);
411 :
412 : /* Functions for apply error callback */
413 : static inline void set_apply_error_context_xact(TransactionId xid, XLogRecPtr lsn);
414 : static inline void reset_apply_error_context_info(void);
415 :
416 : static TransApplyAction get_transaction_apply_action(TransactionId xid,
417 : ParallelApplyWorkerInfo **winfo);
418 :
419 : /*
420 : * Form the origin name for the subscription.
421 : *
422 : * This is a common function for tablesync and other workers. Tablesync workers
423 : * must pass a valid relid. Other callers must pass relid = InvalidOid.
424 : *
425 : * Return the name in the supplied buffer.
426 : */
427 : void
428 2166 : ReplicationOriginNameForLogicalRep(Oid suboid, Oid relid,
429 : char *originname, Size szoriginname)
430 : {
431 2166 : if (OidIsValid(relid))
432 : {
433 : /* Replication origin name for tablesync workers. */
434 1300 : snprintf(originname, szoriginname, "pg_%u_%u", suboid, relid);
435 : }
436 : else
437 : {
438 : /* Replication origin name for non-tablesync workers. */
439 866 : snprintf(originname, szoriginname, "pg_%u", suboid);
440 : }
441 2166 : }
442 :
443 : /*
444 : * Should this worker apply changes for given relation.
445 : *
446 : * This is mainly needed for initial relation data sync as that runs in
447 : * separate worker process running in parallel and we need some way to skip
448 : * changes coming to the leader apply worker during the sync of a table.
449 : *
450 : * Note we need to do smaller or equals comparison for SYNCDONE state because
451 : * it might hold position of end of initial slot consistent point WAL
452 : * record + 1 (ie start of next record) and next record can be COMMIT of
453 : * transaction we are now processing (which is what we set remote_final_lsn
454 : * to in apply_handle_begin).
455 : *
456 : * Note that for streaming transactions that are being applied in the parallel
457 : * apply worker, we disallow applying changes if the target table in the
458 : * subscription is not in the READY state, because we cannot decide whether to
459 : * apply the change as we won't know remote_final_lsn by that time.
460 : *
461 : * We already checked this in pa_can_start() before assigning the
462 : * streaming transaction to the parallel worker, but it also needs to be
463 : * checked here because if the user executes ALTER SUBSCRIPTION ... REFRESH
464 : * PUBLICATION in parallel, the new table can be added to pg_subscription_rel
465 : * while applying this transaction.
466 : */
467 : static bool
468 297022 : should_apply_changes_for_rel(LogicalRepRelMapEntry *rel)
469 : {
470 297022 : switch (MyLogicalRepWorker->type)
471 : {
472 0 : case WORKERTYPE_TABLESYNC:
473 0 : return MyLogicalRepWorker->relid == rel->localreloid;
474 :
475 137720 : case WORKERTYPE_PARALLEL_APPLY:
476 : /* We don't synchronize rel's that are in unknown state. */
477 137720 : if (rel->state != SUBREL_STATE_READY &&
478 0 : rel->state != SUBREL_STATE_UNKNOWN)
479 0 : ereport(ERROR,
480 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
481 : errmsg("logical replication parallel apply worker for subscription \"%s\" will stop",
482 : MySubscription->name),
483 : errdetail("Cannot handle streamed replication transactions using parallel apply workers until all tables have been synchronized.")));
484 :
485 137720 : return rel->state == SUBREL_STATE_READY;
486 :
487 159302 : case WORKERTYPE_APPLY:
488 159400 : return (rel->state == SUBREL_STATE_READY ||
489 98 : (rel->state == SUBREL_STATE_SYNCDONE &&
490 0 : rel->statelsn <= remote_final_lsn));
491 :
492 0 : case WORKERTYPE_UNKNOWN:
493 : /* Should never happen. */
494 0 : elog(ERROR, "Unknown worker type");
495 : }
496 :
497 0 : return false; /* dummy for compiler */
498 : }
499 :
500 : /*
501 : * Begin one step (one INSERT, UPDATE, etc) of a replication transaction.
502 : *
503 : * Start a transaction, if this is the first step (else we keep using the
504 : * existing transaction).
505 : * Also provide a global snapshot and ensure we run in ApplyMessageContext.
506 : */
507 : static void
508 297922 : begin_replication_step(void)
509 : {
510 297922 : SetCurrentStatementStartTimestamp();
511 :
512 297922 : if (!IsTransactionState())
513 : {
514 1748 : StartTransactionCommand();
515 1748 : maybe_reread_subscription();
516 : }
517 :
518 297918 : PushActiveSnapshot(GetTransactionSnapshot());
519 :
520 297918 : MemoryContextSwitchTo(ApplyMessageContext);
521 297918 : }
522 :
523 : /*
524 : * Finish up one step of a replication transaction.
525 : * Callers of begin_replication_step() must also call this.
526 : *
527 : * We don't close out the transaction here, but we should increment
528 : * the command counter to make the effects of this step visible.
529 : */
530 : static void
531 297866 : end_replication_step(void)
532 : {
533 297866 : PopActiveSnapshot();
534 :
535 297866 : CommandCounterIncrement();
536 297866 : }
537 :
538 : /*
539 : * Handle streamed transactions for both the leader apply worker and the
540 : * parallel apply workers.
541 : *
542 : * In the streaming case (receiving a block of the streamed transaction), for
543 : * serialize mode, simply redirect it to a file for the proper toplevel
544 : * transaction, and for parallel mode, the leader apply worker will send the
545 : * changes to parallel apply workers and the parallel apply worker will define
546 : * savepoints if needed. (LOGICAL_REP_MSG_RELATION or LOGICAL_REP_MSG_TYPE
547 : * messages will be applied by both leader apply worker and parallel apply
548 : * workers).
549 : *
550 : * Returns true for streamed transactions (when the change is either serialized
551 : * to file or sent to parallel apply worker), false otherwise (regular mode or
552 : * needs to be processed by parallel apply worker).
553 : *
554 : * Exception: If the message being processed is LOGICAL_REP_MSG_RELATION
555 : * or LOGICAL_REP_MSG_TYPE, return false even if the message needs to be sent
556 : * to a parallel apply worker.
557 : */
558 : static bool
559 649568 : handle_streamed_transaction(LogicalRepMsgType action, StringInfo s)
560 : {
561 : TransactionId current_xid;
562 : ParallelApplyWorkerInfo *winfo;
563 : TransApplyAction apply_action;
564 : StringInfoData original_msg;
565 :
566 649568 : apply_action = get_transaction_apply_action(stream_xid, &winfo);
567 :
568 : /* not in streaming mode */
569 649568 : if (apply_action == TRANS_LEADER_APPLY)
570 159982 : return false;
571 :
572 : Assert(TransactionIdIsValid(stream_xid));
573 :
574 : /*
575 : * The parallel apply worker needs the xid in this message to decide
576 : * whether to define a savepoint, so save the original message that has
577 : * not moved the cursor after the xid. We will serialize this message to a
578 : * file in PARTIAL_SERIALIZE mode.
579 : */
580 489586 : original_msg = *s;
581 :
582 : /*
583 : * We should have received XID of the subxact as the first part of the
584 : * message, so extract it.
585 : */
586 489586 : current_xid = pq_getmsgint(s, 4);
587 :
588 489586 : if (!TransactionIdIsValid(current_xid))
589 0 : ereport(ERROR,
590 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
591 : errmsg_internal("invalid transaction ID in streamed replication transaction")));
592 :
593 489586 : switch (apply_action)
594 : {
595 205026 : case TRANS_LEADER_SERIALIZE:
596 : Assert(stream_fd);
597 :
598 : /* Add the new subxact to the array (unless already there). */
599 205026 : subxact_info_add(current_xid);
600 :
601 : /* Write the change to the current file */
602 205026 : stream_write_change(action, s);
603 205026 : return true;
604 :
605 136772 : case TRANS_LEADER_SEND_TO_PARALLEL:
606 : Assert(winfo);
607 :
608 : /*
609 : * XXX The publisher side doesn't always send relation/type update
610 : * messages after the streaming transaction, so also update the
611 : * relation/type in leader apply worker. See function
612 : * cleanup_rel_sync_cache.
613 : */
614 136772 : if (pa_send_data(winfo, s->len, s->data))
615 136772 : return (action != LOGICAL_REP_MSG_RELATION &&
616 : action != LOGICAL_REP_MSG_TYPE);
617 :
618 : /*
619 : * Switch to serialize mode when we are not able to send the
620 : * change to parallel apply worker.
621 : */
622 0 : pa_switch_to_partial_serialize(winfo, false);
623 :
624 : /* fall through */
625 10012 : case TRANS_LEADER_PARTIAL_SERIALIZE:
626 10012 : stream_write_change(action, &original_msg);
627 :
628 : /* Same reason as TRANS_LEADER_SEND_TO_PARALLEL case. */
629 10012 : return (action != LOGICAL_REP_MSG_RELATION &&
630 : action != LOGICAL_REP_MSG_TYPE);
631 :
632 137776 : case TRANS_PARALLEL_APPLY:
633 137776 : parallel_stream_nchanges += 1;
634 :
635 : /* Define a savepoint for a subxact if needed. */
636 137776 : pa_start_subtrans(current_xid, stream_xid);
637 137776 : return false;
638 :
639 0 : default:
640 0 : elog(ERROR, "unexpected apply action: %d", (int) apply_action);
641 : return false; /* silence compiler warning */
642 : }
643 : }
644 :
645 : /*
646 : * Executor state preparation for evaluation of constraint expressions,
647 : * indexes and triggers for the specified relation.
648 : *
649 : * Note that the caller must open and close any indexes to be updated.
650 : */
651 : static ApplyExecutionData *
652 296866 : create_edata_for_relation(LogicalRepRelMapEntry *rel)
653 : {
654 : ApplyExecutionData *edata;
655 : EState *estate;
656 : RangeTblEntry *rte;
657 296866 : List *perminfos = NIL;
658 : ResultRelInfo *resultRelInfo;
659 :
660 296866 : edata = (ApplyExecutionData *) palloc0(sizeof(ApplyExecutionData));
661 296866 : edata->targetRel = rel;
662 :
663 296866 : edata->estate = estate = CreateExecutorState();
664 :
665 296866 : rte = makeNode(RangeTblEntry);
666 296866 : rte->rtekind = RTE_RELATION;
667 296866 : rte->relid = RelationGetRelid(rel->localrel);
668 296866 : rte->relkind = rel->localrel->rd_rel->relkind;
669 296866 : rte->rellockmode = AccessShareLock;
670 :
671 296866 : addRTEPermissionInfo(&perminfos, rte);
672 :
673 296866 : ExecInitRangeTable(estate, list_make1(rte), perminfos);
674 :
675 296866 : edata->targetRelInfo = resultRelInfo = makeNode(ResultRelInfo);
676 :
677 : /*
678 : * Use Relation opened by logicalrep_rel_open() instead of opening it
679 : * again.
680 : */
681 296866 : InitResultRelInfo(resultRelInfo, rel->localrel, 1, NULL, 0);
682 :
683 : /*
684 : * We put the ResultRelInfo in the es_opened_result_relations list, even
685 : * though we don't populate the es_result_relations array. That's a bit
686 : * bogus, but it's enough to make ExecGetTriggerResultRel() find them.
687 : *
688 : * ExecOpenIndices() is not called here either, each execution path doing
689 : * an apply operation being responsible for that.
690 : */
691 296866 : estate->es_opened_result_relations =
692 296866 : lappend(estate->es_opened_result_relations, resultRelInfo);
693 :
694 296866 : estate->es_output_cid = GetCurrentCommandId(true);
695 :
696 : /* Prepare to catch AFTER triggers. */
697 296866 : AfterTriggerBeginQuery();
698 :
699 : /* other fields of edata remain NULL for now */
700 :
701 296866 : return edata;
702 : }
703 :
704 : /*
705 : * Finish any operations related to the executor state created by
706 : * create_edata_for_relation().
707 : */
708 : static void
709 296830 : finish_edata(ApplyExecutionData *edata)
710 : {
711 296830 : EState *estate = edata->estate;
712 :
713 : /* Handle any queued AFTER triggers. */
714 296830 : AfterTriggerEndQuery(estate);
715 :
716 : /* Shut down tuple routing, if any was done. */
717 296830 : if (edata->proute)
718 146 : ExecCleanupTupleRouting(edata->mtstate, edata->proute);
719 :
720 : /*
721 : * Cleanup. It might seem that we should call ExecCloseResultRelations()
722 : * here, but we intentionally don't. It would close the rel we added to
723 : * es_opened_result_relations above, which is wrong because we took no
724 : * corresponding refcount. We rely on ExecCleanupTupleRouting() to close
725 : * any other relations opened during execution.
726 : */
727 296830 : ExecResetTupleTable(estate->es_tupleTable, false);
728 296830 : FreeExecutorState(estate);
729 296830 : pfree(edata);
730 296830 : }
731 :
732 : /*
733 : * Executes default values for columns for which we can't map to remote
734 : * relation columns.
735 : *
736 : * This allows us to support tables which have more columns on the downstream
737 : * than on the upstream.
738 : */
739 : static void
740 152414 : slot_fill_defaults(LogicalRepRelMapEntry *rel, EState *estate,
741 : TupleTableSlot *slot)
742 : {
743 152414 : TupleDesc desc = RelationGetDescr(rel->localrel);
744 152414 : int num_phys_attrs = desc->natts;
745 : int i;
746 : int attnum,
747 152414 : num_defaults = 0;
748 : int *defmap;
749 : ExprState **defexprs;
750 : ExprContext *econtext;
751 :
752 152414 : econtext = GetPerTupleExprContext(estate);
753 :
754 : /* We got all the data via replication, no need to evaluate anything. */
755 152414 : if (num_phys_attrs == rel->remoterel.natts)
756 72138 : return;
757 :
758 80276 : defmap = (int *) palloc(num_phys_attrs * sizeof(int));
759 80276 : defexprs = (ExprState **) palloc(num_phys_attrs * sizeof(ExprState *));
760 :
761 : Assert(rel->attrmap->maplen == num_phys_attrs);
762 421270 : for (attnum = 0; attnum < num_phys_attrs; attnum++)
763 : {
764 : Expr *defexpr;
765 :
766 340994 : if (TupleDescAttr(desc, attnum)->attisdropped || TupleDescAttr(desc, attnum)->attgenerated)
767 8 : continue;
768 :
769 340986 : if (rel->attrmap->attnums[attnum] >= 0)
770 184520 : continue;
771 :
772 156466 : defexpr = (Expr *) build_column_default(rel->localrel, attnum + 1);
773 :
774 156466 : if (defexpr != NULL)
775 : {
776 : /* Run the expression through planner */
777 140262 : defexpr = expression_planner(defexpr);
778 :
779 : /* Initialize executable expression in copycontext */
780 140262 : defexprs[num_defaults] = ExecInitExpr(defexpr, NULL);
781 140262 : defmap[num_defaults] = attnum;
782 140262 : num_defaults++;
783 : }
784 : }
785 :
786 220538 : for (i = 0; i < num_defaults; i++)
787 140262 : slot->tts_values[defmap[i]] =
788 140262 : ExecEvalExpr(defexprs[i], econtext, &slot->tts_isnull[defmap[i]]);
789 : }
790 :
791 : /*
792 : * Store tuple data into slot.
793 : *
794 : * Incoming data can be either text or binary format.
795 : */
796 : static void
797 296866 : slot_store_data(TupleTableSlot *slot, LogicalRepRelMapEntry *rel,
798 : LogicalRepTupleData *tupleData)
799 : {
800 296866 : int natts = slot->tts_tupleDescriptor->natts;
801 : int i;
802 :
803 296866 : ExecClearTuple(slot);
804 :
805 : /* Call the "in" function for each non-dropped, non-null attribute */
806 : Assert(natts == rel->attrmap->maplen);
807 1316398 : for (i = 0; i < natts; i++)
808 : {
809 1019532 : Form_pg_attribute att = TupleDescAttr(slot->tts_tupleDescriptor, i);
810 1019532 : int remoteattnum = rel->attrmap->attnums[i];
811 :
812 1019532 : if (!att->attisdropped && remoteattnum >= 0)
813 605728 : {
814 605728 : StringInfo colvalue = &tupleData->colvalues[remoteattnum];
815 :
816 : Assert(remoteattnum < tupleData->ncols);
817 :
818 : /* Set attnum for error callback */
819 605728 : apply_error_callback_arg.remote_attnum = remoteattnum;
820 :
821 605728 : if (tupleData->colstatus[remoteattnum] == LOGICALREP_COLUMN_TEXT)
822 : {
823 : Oid typinput;
824 : Oid typioparam;
825 :
826 284144 : getTypeInputInfo(att->atttypid, &typinput, &typioparam);
827 568288 : slot->tts_values[i] =
828 284144 : OidInputFunctionCall(typinput, colvalue->data,
829 : typioparam, att->atttypmod);
830 284144 : slot->tts_isnull[i] = false;
831 : }
832 321584 : else if (tupleData->colstatus[remoteattnum] == LOGICALREP_COLUMN_BINARY)
833 : {
834 : Oid typreceive;
835 : Oid typioparam;
836 :
837 : /*
838 : * In some code paths we may be asked to re-parse the same
839 : * tuple data. Reset the StringInfo's cursor so that works.
840 : */
841 220950 : colvalue->cursor = 0;
842 :
843 220950 : getTypeBinaryInputInfo(att->atttypid, &typreceive, &typioparam);
844 441900 : slot->tts_values[i] =
845 220950 : OidReceiveFunctionCall(typreceive, colvalue,
846 : typioparam, att->atttypmod);
847 :
848 : /* Trouble if it didn't eat the whole buffer */
849 220950 : if (colvalue->cursor != colvalue->len)
850 0 : ereport(ERROR,
851 : (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
852 : errmsg("incorrect binary data format in logical replication column %d",
853 : remoteattnum + 1)));
854 220950 : slot->tts_isnull[i] = false;
855 : }
856 : else
857 : {
858 : /*
859 : * NULL value from remote. (We don't expect to see
860 : * LOGICALREP_COLUMN_UNCHANGED here, but if we do, treat it as
861 : * NULL.)
862 : */
863 100634 : slot->tts_values[i] = (Datum) 0;
864 100634 : slot->tts_isnull[i] = true;
865 : }
866 :
867 : /* Reset attnum for error callback */
868 605728 : apply_error_callback_arg.remote_attnum = -1;
869 : }
870 : else
871 : {
872 : /*
873 : * We assign NULL to dropped attributes and missing values
874 : * (missing values should be later filled using
875 : * slot_fill_defaults).
876 : */
877 413804 : slot->tts_values[i] = (Datum) 0;
878 413804 : slot->tts_isnull[i] = true;
879 : }
880 : }
881 :
882 296866 : ExecStoreVirtualTuple(slot);
883 296866 : }
884 :
885 : /*
886 : * Replace updated columns with data from the LogicalRepTupleData struct.
887 : * This is somewhat similar to heap_modify_tuple but also calls the type
888 : * input functions on the user data.
889 : *
890 : * "slot" is filled with a copy of the tuple in "srcslot", replacing
891 : * columns provided in "tupleData" and leaving others as-is.
892 : *
893 : * Caution: unreplaced pass-by-ref columns in "slot" will point into the
894 : * storage for "srcslot". This is OK for current usage, but someday we may
895 : * need to materialize "slot" at the end to make it independent of "srcslot".
896 : */
897 : static void
898 63828 : slot_modify_data(TupleTableSlot *slot, TupleTableSlot *srcslot,
899 : LogicalRepRelMapEntry *rel,
900 : LogicalRepTupleData *tupleData)
901 : {
902 63828 : int natts = slot->tts_tupleDescriptor->natts;
903 : int i;
904 :
905 : /* We'll fill "slot" with a virtual tuple, so we must start with ... */
906 63828 : ExecClearTuple(slot);
907 :
908 : /*
909 : * Copy all the column data from srcslot, so that we'll have valid values
910 : * for unreplaced columns.
911 : */
912 : Assert(natts == srcslot->tts_tupleDescriptor->natts);
913 63828 : slot_getallattrs(srcslot);
914 63828 : memcpy(slot->tts_values, srcslot->tts_values, natts * sizeof(Datum));
915 63828 : memcpy(slot->tts_isnull, srcslot->tts_isnull, natts * sizeof(bool));
916 :
917 : /* Call the "in" function for each replaced attribute */
918 : Assert(natts == rel->attrmap->maplen);
919 318482 : for (i = 0; i < natts; i++)
920 : {
921 254654 : Form_pg_attribute att = TupleDescAttr(slot->tts_tupleDescriptor, i);
922 254654 : int remoteattnum = rel->attrmap->attnums[i];
923 :
924 254654 : if (remoteattnum < 0)
925 117036 : continue;
926 :
927 : Assert(remoteattnum < tupleData->ncols);
928 :
929 137618 : if (tupleData->colstatus[remoteattnum] != LOGICALREP_COLUMN_UNCHANGED)
930 : {
931 137612 : StringInfo colvalue = &tupleData->colvalues[remoteattnum];
932 :
933 : /* Set attnum for error callback */
934 137612 : apply_error_callback_arg.remote_attnum = remoteattnum;
935 :
936 137612 : if (tupleData->colstatus[remoteattnum] == LOGICALREP_COLUMN_TEXT)
937 : {
938 : Oid typinput;
939 : Oid typioparam;
940 :
941 50806 : getTypeInputInfo(att->atttypid, &typinput, &typioparam);
942 101612 : slot->tts_values[i] =
943 50806 : OidInputFunctionCall(typinput, colvalue->data,
944 : typioparam, att->atttypmod);
945 50806 : slot->tts_isnull[i] = false;
946 : }
947 86806 : else if (tupleData->colstatus[remoteattnum] == LOGICALREP_COLUMN_BINARY)
948 : {
949 : Oid typreceive;
950 : Oid typioparam;
951 :
952 : /*
953 : * In some code paths we may be asked to re-parse the same
954 : * tuple data. Reset the StringInfo's cursor so that works.
955 : */
956 86712 : colvalue->cursor = 0;
957 :
958 86712 : getTypeBinaryInputInfo(att->atttypid, &typreceive, &typioparam);
959 173424 : slot->tts_values[i] =
960 86712 : OidReceiveFunctionCall(typreceive, colvalue,
961 : typioparam, att->atttypmod);
962 :
963 : /* Trouble if it didn't eat the whole buffer */
964 86712 : if (colvalue->cursor != colvalue->len)
965 0 : ereport(ERROR,
966 : (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
967 : errmsg("incorrect binary data format in logical replication column %d",
968 : remoteattnum + 1)));
969 86712 : slot->tts_isnull[i] = false;
970 : }
971 : else
972 : {
973 : /* must be LOGICALREP_COLUMN_NULL */
974 94 : slot->tts_values[i] = (Datum) 0;
975 94 : slot->tts_isnull[i] = true;
976 : }
977 :
978 : /* Reset attnum for error callback */
979 137612 : apply_error_callback_arg.remote_attnum = -1;
980 : }
981 : }
982 :
983 : /* And finally, declare that "slot" contains a valid virtual tuple */
984 63828 : ExecStoreVirtualTuple(slot);
985 63828 : }
986 :
987 : /*
988 : * Handle BEGIN message.
989 : */
990 : static void
991 808 : apply_handle_begin(StringInfo s)
992 : {
993 : LogicalRepBeginData begin_data;
994 :
995 : /* There must not be an active streaming transaction. */
996 : Assert(!TransactionIdIsValid(stream_xid));
997 :
998 808 : logicalrep_read_begin(s, &begin_data);
999 808 : set_apply_error_context_xact(begin_data.xid, begin_data.final_lsn);
1000 :
1001 808 : remote_final_lsn = begin_data.final_lsn;
1002 :
1003 808 : maybe_start_skipping_changes(begin_data.final_lsn);
1004 :
1005 808 : in_remote_transaction = true;
1006 :
1007 808 : pgstat_report_activity(STATE_RUNNING, NULL);
1008 808 : }
1009 :
1010 : /*
1011 : * Handle COMMIT message.
1012 : *
1013 : * TODO, support tracking of multiple origins
1014 : */
1015 : static void
1016 756 : apply_handle_commit(StringInfo s)
1017 : {
1018 : LogicalRepCommitData commit_data;
1019 :
1020 756 : logicalrep_read_commit(s, &commit_data);
1021 :
1022 756 : if (commit_data.commit_lsn != remote_final_lsn)
1023 0 : ereport(ERROR,
1024 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1025 : errmsg_internal("incorrect commit LSN %X/%X in commit message (expected %X/%X)",
1026 : LSN_FORMAT_ARGS(commit_data.commit_lsn),
1027 : LSN_FORMAT_ARGS(remote_final_lsn))));
1028 :
1029 756 : apply_handle_commit_internal(&commit_data);
1030 :
1031 : /* Process any tables that are being synchronized in parallel. */
1032 756 : process_syncing_tables(commit_data.end_lsn);
1033 :
1034 756 : pgstat_report_activity(STATE_IDLE, NULL);
1035 756 : reset_apply_error_context_info();
1036 756 : }
1037 :
1038 : /*
1039 : * Handle BEGIN PREPARE message.
1040 : */
1041 : static void
1042 28 : apply_handle_begin_prepare(StringInfo s)
1043 : {
1044 : LogicalRepPreparedTxnData begin_data;
1045 :
1046 : /* Tablesync should never receive prepare. */
1047 28 : if (am_tablesync_worker())
1048 0 : ereport(ERROR,
1049 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1050 : errmsg_internal("tablesync worker received a BEGIN PREPARE message")));
1051 :
1052 : /* There must not be an active streaming transaction. */
1053 : Assert(!TransactionIdIsValid(stream_xid));
1054 :
1055 28 : logicalrep_read_begin_prepare(s, &begin_data);
1056 28 : set_apply_error_context_xact(begin_data.xid, begin_data.prepare_lsn);
1057 :
1058 28 : remote_final_lsn = begin_data.prepare_lsn;
1059 :
1060 28 : maybe_start_skipping_changes(begin_data.prepare_lsn);
1061 :
1062 28 : in_remote_transaction = true;
1063 :
1064 28 : pgstat_report_activity(STATE_RUNNING, NULL);
1065 28 : }
1066 :
1067 : /*
1068 : * Common function to prepare the GID.
1069 : */
1070 : static void
1071 42 : apply_handle_prepare_internal(LogicalRepPreparedTxnData *prepare_data)
1072 : {
1073 : char gid[GIDSIZE];
1074 :
1075 : /*
1076 : * Compute unique GID for two_phase transactions. We don't use GID of
1077 : * prepared transaction sent by server as that can lead to deadlock when
1078 : * we have multiple subscriptions from same node point to publications on
1079 : * the same node. See comments atop worker.c
1080 : */
1081 42 : TwoPhaseTransactionGid(MySubscription->oid, prepare_data->xid,
1082 : gid, sizeof(gid));
1083 :
1084 : /*
1085 : * BeginTransactionBlock is necessary to balance the EndTransactionBlock
1086 : * called within the PrepareTransactionBlock below.
1087 : */
1088 42 : if (!IsTransactionBlock())
1089 : {
1090 42 : BeginTransactionBlock();
1091 42 : CommitTransactionCommand(); /* Completes the preceding Begin command. */
1092 : }
1093 :
1094 : /*
1095 : * Update origin state so we can restart streaming from correct position
1096 : * in case of crash.
1097 : */
1098 42 : replorigin_session_origin_lsn = prepare_data->end_lsn;
1099 42 : replorigin_session_origin_timestamp = prepare_data->prepare_time;
1100 :
1101 42 : PrepareTransactionBlock(gid);
1102 42 : }
1103 :
1104 : /*
1105 : * Handle PREPARE message.
1106 : */
1107 : static void
1108 26 : apply_handle_prepare(StringInfo s)
1109 : {
1110 : LogicalRepPreparedTxnData prepare_data;
1111 :
1112 26 : logicalrep_read_prepare(s, &prepare_data);
1113 :
1114 26 : if (prepare_data.prepare_lsn != remote_final_lsn)
1115 0 : ereport(ERROR,
1116 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1117 : errmsg_internal("incorrect prepare LSN %X/%X in prepare message (expected %X/%X)",
1118 : LSN_FORMAT_ARGS(prepare_data.prepare_lsn),
1119 : LSN_FORMAT_ARGS(remote_final_lsn))));
1120 :
1121 : /*
1122 : * Unlike commit, here, we always prepare the transaction even though no
1123 : * change has happened in this transaction or all changes are skipped. It
1124 : * is done this way because at commit prepared time, we won't know whether
1125 : * we have skipped preparing a transaction because of those reasons.
1126 : *
1127 : * XXX, We can optimize such that at commit prepared time, we first check
1128 : * whether we have prepared the transaction or not but that doesn't seem
1129 : * worthwhile because such cases shouldn't be common.
1130 : */
1131 26 : begin_replication_step();
1132 :
1133 26 : apply_handle_prepare_internal(&prepare_data);
1134 :
1135 26 : end_replication_step();
1136 26 : CommitTransactionCommand();
1137 26 : pgstat_report_stat(false);
1138 :
1139 26 : store_flush_position(prepare_data.end_lsn, XactLastCommitEnd);
1140 :
1141 26 : in_remote_transaction = false;
1142 :
1143 : /* Process any tables that are being synchronized in parallel. */
1144 26 : process_syncing_tables(prepare_data.end_lsn);
1145 :
1146 : /*
1147 : * Since we have already prepared the transaction, in a case where the
1148 : * server crashes before clearing the subskiplsn, it will be left but the
1149 : * transaction won't be resent. But that's okay because it's a rare case
1150 : * and the subskiplsn will be cleared when finishing the next transaction.
1151 : */
1152 26 : stop_skipping_changes();
1153 26 : clear_subscription_skip_lsn(prepare_data.prepare_lsn);
1154 :
1155 26 : pgstat_report_activity(STATE_IDLE, NULL);
1156 26 : reset_apply_error_context_info();
1157 26 : }
1158 :
1159 : /*
1160 : * Handle a COMMIT PREPARED of a previously PREPARED transaction.
1161 : *
1162 : * Note that we don't need to wait here if the transaction was prepared in a
1163 : * parallel apply worker. In that case, we have already waited for the prepare
1164 : * to finish in apply_handle_stream_prepare() which will ensure all the
1165 : * operations in that transaction have happened in the subscriber, so no
1166 : * concurrent transaction can cause deadlock or transaction dependency issues.
1167 : */
1168 : static void
1169 38 : apply_handle_commit_prepared(StringInfo s)
1170 : {
1171 : LogicalRepCommitPreparedTxnData prepare_data;
1172 : char gid[GIDSIZE];
1173 :
1174 38 : logicalrep_read_commit_prepared(s, &prepare_data);
1175 38 : set_apply_error_context_xact(prepare_data.xid, prepare_data.commit_lsn);
1176 :
1177 : /* Compute GID for two_phase transactions. */
1178 38 : TwoPhaseTransactionGid(MySubscription->oid, prepare_data.xid,
1179 : gid, sizeof(gid));
1180 :
1181 : /* There is no transaction when COMMIT PREPARED is called */
1182 38 : begin_replication_step();
1183 :
1184 : /*
1185 : * Update origin state so we can restart streaming from correct position
1186 : * in case of crash.
1187 : */
1188 38 : replorigin_session_origin_lsn = prepare_data.end_lsn;
1189 38 : replorigin_session_origin_timestamp = prepare_data.commit_time;
1190 :
1191 38 : FinishPreparedTransaction(gid, true);
1192 38 : end_replication_step();
1193 38 : CommitTransactionCommand();
1194 38 : pgstat_report_stat(false);
1195 :
1196 38 : store_flush_position(prepare_data.end_lsn, XactLastCommitEnd);
1197 38 : in_remote_transaction = false;
1198 :
1199 : /* Process any tables that are being synchronized in parallel. */
1200 38 : process_syncing_tables(prepare_data.end_lsn);
1201 :
1202 38 : clear_subscription_skip_lsn(prepare_data.end_lsn);
1203 :
1204 38 : pgstat_report_activity(STATE_IDLE, NULL);
1205 38 : reset_apply_error_context_info();
1206 38 : }
1207 :
1208 : /*
1209 : * Handle a ROLLBACK PREPARED of a previously PREPARED TRANSACTION.
1210 : *
1211 : * Note that we don't need to wait here if the transaction was prepared in a
1212 : * parallel apply worker. In that case, we have already waited for the prepare
1213 : * to finish in apply_handle_stream_prepare() which will ensure all the
1214 : * operations in that transaction have happened in the subscriber, so no
1215 : * concurrent transaction can cause deadlock or transaction dependency issues.
1216 : */
1217 : static void
1218 10 : apply_handle_rollback_prepared(StringInfo s)
1219 : {
1220 : LogicalRepRollbackPreparedTxnData rollback_data;
1221 : char gid[GIDSIZE];
1222 :
1223 10 : logicalrep_read_rollback_prepared(s, &rollback_data);
1224 10 : set_apply_error_context_xact(rollback_data.xid, rollback_data.rollback_end_lsn);
1225 :
1226 : /* Compute GID for two_phase transactions. */
1227 10 : TwoPhaseTransactionGid(MySubscription->oid, rollback_data.xid,
1228 : gid, sizeof(gid));
1229 :
1230 : /*
1231 : * It is possible that we haven't received prepare because it occurred
1232 : * before walsender reached a consistent point or the two_phase was still
1233 : * not enabled by that time, so in such cases, we need to skip rollback
1234 : * prepared.
1235 : */
1236 10 : if (LookupGXact(gid, rollback_data.prepare_end_lsn,
1237 : rollback_data.prepare_time))
1238 : {
1239 : /*
1240 : * Update origin state so we can restart streaming from correct
1241 : * position in case of crash.
1242 : */
1243 10 : replorigin_session_origin_lsn = rollback_data.rollback_end_lsn;
1244 10 : replorigin_session_origin_timestamp = rollback_data.rollback_time;
1245 :
1246 : /* There is no transaction when ABORT/ROLLBACK PREPARED is called */
1247 10 : begin_replication_step();
1248 10 : FinishPreparedTransaction(gid, false);
1249 10 : end_replication_step();
1250 10 : CommitTransactionCommand();
1251 :
1252 10 : clear_subscription_skip_lsn(rollback_data.rollback_end_lsn);
1253 : }
1254 :
1255 10 : pgstat_report_stat(false);
1256 :
1257 10 : store_flush_position(rollback_data.rollback_end_lsn, XactLastCommitEnd);
1258 10 : in_remote_transaction = false;
1259 :
1260 : /* Process any tables that are being synchronized in parallel. */
1261 10 : process_syncing_tables(rollback_data.rollback_end_lsn);
1262 :
1263 10 : pgstat_report_activity(STATE_IDLE, NULL);
1264 10 : reset_apply_error_context_info();
1265 10 : }
1266 :
1267 : /*
1268 : * Handle STREAM PREPARE.
1269 : */
1270 : static void
1271 22 : apply_handle_stream_prepare(StringInfo s)
1272 : {
1273 : LogicalRepPreparedTxnData prepare_data;
1274 : ParallelApplyWorkerInfo *winfo;
1275 : TransApplyAction apply_action;
1276 :
1277 : /* Save the message before it is consumed. */
1278 22 : StringInfoData original_msg = *s;
1279 :
1280 22 : if (in_streamed_transaction)
1281 0 : ereport(ERROR,
1282 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1283 : errmsg_internal("STREAM PREPARE message without STREAM STOP")));
1284 :
1285 : /* Tablesync should never receive prepare. */
1286 22 : if (am_tablesync_worker())
1287 0 : ereport(ERROR,
1288 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1289 : errmsg_internal("tablesync worker received a STREAM PREPARE message")));
1290 :
1291 22 : logicalrep_read_stream_prepare(s, &prepare_data);
1292 22 : set_apply_error_context_xact(prepare_data.xid, prepare_data.prepare_lsn);
1293 :
1294 22 : apply_action = get_transaction_apply_action(prepare_data.xid, &winfo);
1295 :
1296 22 : switch (apply_action)
1297 : {
1298 10 : case TRANS_LEADER_APPLY:
1299 :
1300 : /*
1301 : * The transaction has been serialized to file, so replay all the
1302 : * spooled operations.
1303 : */
1304 10 : apply_spooled_messages(MyLogicalRepWorker->stream_fileset,
1305 : prepare_data.xid, prepare_data.prepare_lsn);
1306 :
1307 : /* Mark the transaction as prepared. */
1308 10 : apply_handle_prepare_internal(&prepare_data);
1309 :
1310 10 : CommitTransactionCommand();
1311 :
1312 10 : store_flush_position(prepare_data.end_lsn, XactLastCommitEnd);
1313 :
1314 10 : in_remote_transaction = false;
1315 :
1316 : /* Unlink the files with serialized changes and subxact info. */
1317 10 : stream_cleanup_files(MyLogicalRepWorker->subid, prepare_data.xid);
1318 :
1319 10 : elog(DEBUG1, "finished processing the STREAM PREPARE command");
1320 10 : break;
1321 :
1322 4 : case TRANS_LEADER_SEND_TO_PARALLEL:
1323 : Assert(winfo);
1324 :
1325 4 : if (pa_send_data(winfo, s->len, s->data))
1326 : {
1327 : /* Finish processing the streaming transaction. */
1328 4 : pa_xact_finish(winfo, prepare_data.end_lsn);
1329 4 : break;
1330 : }
1331 :
1332 : /*
1333 : * Switch to serialize mode when we are not able to send the
1334 : * change to parallel apply worker.
1335 : */
1336 0 : pa_switch_to_partial_serialize(winfo, true);
1337 :
1338 : /* fall through */
1339 2 : case TRANS_LEADER_PARTIAL_SERIALIZE:
1340 : Assert(winfo);
1341 :
1342 2 : stream_open_and_write_change(prepare_data.xid,
1343 : LOGICAL_REP_MSG_STREAM_PREPARE,
1344 : &original_msg);
1345 :
1346 2 : pa_set_fileset_state(winfo->shared, FS_SERIALIZE_DONE);
1347 :
1348 : /* Finish processing the streaming transaction. */
1349 2 : pa_xact_finish(winfo, prepare_data.end_lsn);
1350 2 : break;
1351 :
1352 6 : case TRANS_PARALLEL_APPLY:
1353 :
1354 : /*
1355 : * If the parallel apply worker is applying spooled messages then
1356 : * close the file before preparing.
1357 : */
1358 6 : if (stream_fd)
1359 2 : stream_close_file();
1360 :
1361 6 : begin_replication_step();
1362 :
1363 : /* Mark the transaction as prepared. */
1364 6 : apply_handle_prepare_internal(&prepare_data);
1365 :
1366 6 : end_replication_step();
1367 :
1368 6 : CommitTransactionCommand();
1369 :
1370 6 : MyParallelShared->last_commit_end = XactLastCommitEnd;
1371 :
1372 6 : pa_set_xact_state(MyParallelShared, PARALLEL_TRANS_FINISHED);
1373 6 : pa_unlock_transaction(MyParallelShared->xid, AccessExclusiveLock);
1374 :
1375 6 : pa_reset_subtrans();
1376 :
1377 6 : elog(DEBUG1, "finished processing the STREAM PREPARE command");
1378 6 : break;
1379 :
1380 0 : default:
1381 0 : elog(ERROR, "unexpected apply action: %d", (int) apply_action);
1382 : break;
1383 : }
1384 :
1385 22 : pgstat_report_stat(false);
1386 :
1387 : /* Process any tables that are being synchronized in parallel. */
1388 22 : process_syncing_tables(prepare_data.end_lsn);
1389 :
1390 : /*
1391 : * Similar to prepare case, the subskiplsn could be left in a case of
1392 : * server crash but it's okay. See the comments in apply_handle_prepare().
1393 : */
1394 22 : stop_skipping_changes();
1395 22 : clear_subscription_skip_lsn(prepare_data.prepare_lsn);
1396 :
1397 22 : pgstat_report_activity(STATE_IDLE, NULL);
1398 :
1399 22 : reset_apply_error_context_info();
1400 22 : }
1401 :
1402 : /*
1403 : * Handle ORIGIN message.
1404 : *
1405 : * TODO, support tracking of multiple origins
1406 : */
1407 : static void
1408 14 : apply_handle_origin(StringInfo s)
1409 : {
1410 : /*
1411 : * ORIGIN message can only come inside streaming transaction or inside
1412 : * remote transaction and before any actual writes.
1413 : */
1414 14 : if (!in_streamed_transaction &&
1415 20 : (!in_remote_transaction ||
1416 10 : (IsTransactionState() && !am_tablesync_worker())))
1417 0 : ereport(ERROR,
1418 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1419 : errmsg_internal("ORIGIN message sent out of order")));
1420 14 : }
1421 :
1422 : /*
1423 : * Initialize fileset (if not already done).
1424 : *
1425 : * Create a new file when first_segment is true, otherwise open the existing
1426 : * file.
1427 : */
1428 : void
1429 724 : stream_start_internal(TransactionId xid, bool first_segment)
1430 : {
1431 724 : begin_replication_step();
1432 :
1433 : /*
1434 : * Initialize the worker's stream_fileset if we haven't yet. This will be
1435 : * used for the entire duration of the worker so create it in a permanent
1436 : * context. We create this on the very first streaming message from any
1437 : * transaction and then use it for this and other streaming transactions.
1438 : * Now, we could create a fileset at the start of the worker as well but
1439 : * then we won't be sure that it will ever be used.
1440 : */
1441 724 : if (!MyLogicalRepWorker->stream_fileset)
1442 : {
1443 : MemoryContext oldctx;
1444 :
1445 28 : oldctx = MemoryContextSwitchTo(ApplyContext);
1446 :
1447 28 : MyLogicalRepWorker->stream_fileset = palloc(sizeof(FileSet));
1448 28 : FileSetInit(MyLogicalRepWorker->stream_fileset);
1449 :
1450 28 : MemoryContextSwitchTo(oldctx);
1451 : }
1452 :
1453 : /* Open the spool file for this transaction. */
1454 724 : stream_open_file(MyLogicalRepWorker->subid, xid, first_segment);
1455 :
1456 : /* If this is not the first segment, open existing subxact file. */
1457 724 : if (!first_segment)
1458 660 : subxact_info_read(MyLogicalRepWorker->subid, xid);
1459 :
1460 724 : end_replication_step();
1461 724 : }
1462 :
1463 : /*
1464 : * Handle STREAM START message.
1465 : */
1466 : static void
1467 1678 : apply_handle_stream_start(StringInfo s)
1468 : {
1469 : bool first_segment;
1470 : ParallelApplyWorkerInfo *winfo;
1471 : TransApplyAction apply_action;
1472 :
1473 : /* Save the message before it is consumed. */
1474 1678 : StringInfoData original_msg = *s;
1475 :
1476 1678 : if (in_streamed_transaction)
1477 0 : ereport(ERROR,
1478 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1479 : errmsg_internal("duplicate STREAM START message")));
1480 :
1481 : /* There must not be an active streaming transaction. */
1482 : Assert(!TransactionIdIsValid(stream_xid));
1483 :
1484 : /* notify handle methods we're processing a remote transaction */
1485 1678 : in_streamed_transaction = true;
1486 :
1487 : /* extract XID of the top-level transaction */
1488 1678 : stream_xid = logicalrep_read_stream_start(s, &first_segment);
1489 :
1490 1678 : if (!TransactionIdIsValid(stream_xid))
1491 0 : ereport(ERROR,
1492 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1493 : errmsg_internal("invalid transaction ID in streamed replication transaction")));
1494 :
1495 1678 : set_apply_error_context_xact(stream_xid, InvalidXLogRecPtr);
1496 :
1497 : /* Try to allocate a worker for the streaming transaction. */
1498 1678 : if (first_segment)
1499 164 : pa_allocate_worker(stream_xid);
1500 :
1501 1678 : apply_action = get_transaction_apply_action(stream_xid, &winfo);
1502 :
1503 1678 : switch (apply_action)
1504 : {
1505 684 : case TRANS_LEADER_SERIALIZE:
1506 :
1507 : /*
1508 : * Function stream_start_internal starts a transaction. This
1509 : * transaction will be committed on the stream stop unless it is a
1510 : * tablesync worker in which case it will be committed after
1511 : * processing all the messages. We need this transaction for
1512 : * handling the BufFile, used for serializing the streaming data
1513 : * and subxact info.
1514 : */
1515 684 : stream_start_internal(stream_xid, first_segment);
1516 684 : break;
1517 :
1518 484 : case TRANS_LEADER_SEND_TO_PARALLEL:
1519 : Assert(winfo);
1520 :
1521 : /*
1522 : * Once we start serializing the changes, the parallel apply
1523 : * worker will wait for the leader to release the stream lock
1524 : * until the end of the transaction. So, we don't need to release
1525 : * the lock or increment the stream count in that case.
1526 : */
1527 484 : if (pa_send_data(winfo, s->len, s->data))
1528 : {
1529 : /*
1530 : * Unlock the shared object lock so that the parallel apply
1531 : * worker can continue to receive changes.
1532 : */
1533 476 : if (!first_segment)
1534 430 : pa_unlock_stream(winfo->shared->xid, AccessExclusiveLock);
1535 :
1536 : /*
1537 : * Increment the number of streaming blocks waiting to be
1538 : * processed by parallel apply worker.
1539 : */
1540 476 : pg_atomic_add_fetch_u32(&winfo->shared->pending_stream_count, 1);
1541 :
1542 : /* Cache the parallel apply worker for this transaction. */
1543 476 : pa_set_stream_apply_worker(winfo);
1544 476 : break;
1545 : }
1546 :
1547 : /*
1548 : * Switch to serialize mode when we are not able to send the
1549 : * change to parallel apply worker.
1550 : */
1551 8 : pa_switch_to_partial_serialize(winfo, !first_segment);
1552 :
1553 : /* fall through */
1554 30 : case TRANS_LEADER_PARTIAL_SERIALIZE:
1555 : Assert(winfo);
1556 :
1557 : /*
1558 : * Open the spool file unless it was already opened when switching
1559 : * to serialize mode. The transaction started in
1560 : * stream_start_internal will be committed on the stream stop.
1561 : */
1562 30 : if (apply_action != TRANS_LEADER_SEND_TO_PARALLEL)
1563 22 : stream_start_internal(stream_xid, first_segment);
1564 :
1565 30 : stream_write_change(LOGICAL_REP_MSG_STREAM_START, &original_msg);
1566 :
1567 : /* Cache the parallel apply worker for this transaction. */
1568 30 : pa_set_stream_apply_worker(winfo);
1569 30 : break;
1570 :
1571 488 : case TRANS_PARALLEL_APPLY:
1572 488 : if (first_segment)
1573 : {
1574 : /* Hold the lock until the end of the transaction. */
1575 54 : pa_lock_transaction(MyParallelShared->xid, AccessExclusiveLock);
1576 54 : pa_set_xact_state(MyParallelShared, PARALLEL_TRANS_STARTED);
1577 :
1578 : /*
1579 : * Signal the leader apply worker, as it may be waiting for
1580 : * us.
1581 : */
1582 54 : logicalrep_worker_wakeup(MyLogicalRepWorker->subid, InvalidOid);
1583 : }
1584 :
1585 488 : parallel_stream_nchanges = 0;
1586 488 : break;
1587 :
1588 0 : default:
1589 0 : elog(ERROR, "unexpected apply action: %d", (int) apply_action);
1590 : break;
1591 : }
1592 :
1593 1678 : pgstat_report_activity(STATE_RUNNING, NULL);
1594 1678 : }
1595 :
1596 : /*
1597 : * Update the information about subxacts and close the file.
1598 : *
1599 : * This function should be called when the stream_start_internal function has
1600 : * been called.
1601 : */
1602 : void
1603 724 : stream_stop_internal(TransactionId xid)
1604 : {
1605 : /*
1606 : * Serialize information about subxacts for the toplevel transaction, then
1607 : * close the stream messages spool file.
1608 : */
1609 724 : subxact_info_write(MyLogicalRepWorker->subid, xid);
1610 724 : stream_close_file();
1611 :
1612 : /* We must be in a valid transaction state */
1613 : Assert(IsTransactionState());
1614 :
1615 : /* Commit the per-stream transaction */
1616 724 : CommitTransactionCommand();
1617 :
1618 : /* Reset per-stream context */
1619 724 : MemoryContextReset(LogicalStreamingContext);
1620 724 : }
1621 :
1622 : /*
1623 : * Handle STREAM STOP message.
1624 : */
1625 : static void
1626 1676 : apply_handle_stream_stop(StringInfo s)
1627 : {
1628 : ParallelApplyWorkerInfo *winfo;
1629 : TransApplyAction apply_action;
1630 :
1631 1676 : if (!in_streamed_transaction)
1632 0 : ereport(ERROR,
1633 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1634 : errmsg_internal("STREAM STOP message without STREAM START")));
1635 :
1636 1676 : apply_action = get_transaction_apply_action(stream_xid, &winfo);
1637 :
1638 1676 : switch (apply_action)
1639 : {
1640 684 : case TRANS_LEADER_SERIALIZE:
1641 684 : stream_stop_internal(stream_xid);
1642 684 : break;
1643 :
1644 476 : case TRANS_LEADER_SEND_TO_PARALLEL:
1645 : Assert(winfo);
1646 :
1647 : /*
1648 : * Lock before sending the STREAM_STOP message so that the leader
1649 : * can hold the lock first and the parallel apply worker will wait
1650 : * for leader to release the lock. See Locking Considerations atop
1651 : * applyparallelworker.c.
1652 : */
1653 476 : pa_lock_stream(winfo->shared->xid, AccessExclusiveLock);
1654 :
1655 476 : if (pa_send_data(winfo, s->len, s->data))
1656 : {
1657 476 : pa_set_stream_apply_worker(NULL);
1658 476 : break;
1659 : }
1660 :
1661 : /*
1662 : * Switch to serialize mode when we are not able to send the
1663 : * change to parallel apply worker.
1664 : */
1665 0 : pa_switch_to_partial_serialize(winfo, true);
1666 :
1667 : /* fall through */
1668 30 : case TRANS_LEADER_PARTIAL_SERIALIZE:
1669 30 : stream_write_change(LOGICAL_REP_MSG_STREAM_STOP, s);
1670 30 : stream_stop_internal(stream_xid);
1671 30 : pa_set_stream_apply_worker(NULL);
1672 30 : break;
1673 :
1674 486 : case TRANS_PARALLEL_APPLY:
1675 486 : elog(DEBUG1, "applied %u changes in the streaming chunk",
1676 : parallel_stream_nchanges);
1677 :
1678 : /*
1679 : * By the time parallel apply worker is processing the changes in
1680 : * the current streaming block, the leader apply worker may have
1681 : * sent multiple streaming blocks. This can lead to parallel apply
1682 : * worker start waiting even when there are more chunk of streams
1683 : * in the queue. So, try to lock only if there is no message left
1684 : * in the queue. See Locking Considerations atop
1685 : * applyparallelworker.c.
1686 : *
1687 : * Note that here we have a race condition where we can start
1688 : * waiting even when there are pending streaming chunks. This can
1689 : * happen if the leader sends another streaming block and acquires
1690 : * the stream lock again after the parallel apply worker checks
1691 : * that there is no pending streaming block and before it actually
1692 : * starts waiting on a lock. We can handle this case by not
1693 : * allowing the leader to increment the stream block count during
1694 : * the time parallel apply worker acquires the lock but it is not
1695 : * clear whether that is worth the complexity.
1696 : *
1697 : * Now, if this missed chunk contains rollback to savepoint, then
1698 : * there is a risk of deadlock which probably shouldn't happen
1699 : * after restart.
1700 : */
1701 486 : pa_decr_and_wait_stream_block();
1702 484 : break;
1703 :
1704 0 : default:
1705 0 : elog(ERROR, "unexpected apply action: %d", (int) apply_action);
1706 : break;
1707 : }
1708 :
1709 1674 : in_streamed_transaction = false;
1710 1674 : stream_xid = InvalidTransactionId;
1711 :
1712 : /*
1713 : * The parallel apply worker could be in a transaction in which case we
1714 : * need to report the state as STATE_IDLEINTRANSACTION.
1715 : */
1716 1674 : if (IsTransactionOrTransactionBlock())
1717 484 : pgstat_report_activity(STATE_IDLEINTRANSACTION, NULL);
1718 : else
1719 1190 : pgstat_report_activity(STATE_IDLE, NULL);
1720 :
1721 1674 : reset_apply_error_context_info();
1722 1674 : }
1723 :
1724 : /*
1725 : * Helper function to handle STREAM ABORT message when the transaction was
1726 : * serialized to file.
1727 : */
1728 : static void
1729 28 : stream_abort_internal(TransactionId xid, TransactionId subxid)
1730 : {
1731 : /*
1732 : * If the two XIDs are the same, it's in fact abort of toplevel xact, so
1733 : * just delete the files with serialized info.
1734 : */
1735 28 : if (xid == subxid)
1736 2 : stream_cleanup_files(MyLogicalRepWorker->subid, xid);
1737 : else
1738 : {
1739 : /*
1740 : * OK, so it's a subxact. We need to read the subxact file for the
1741 : * toplevel transaction, determine the offset tracked for the subxact,
1742 : * and truncate the file with changes. We also remove the subxacts
1743 : * with higher offsets (or rather higher XIDs).
1744 : *
1745 : * We intentionally scan the array from the tail, because we're likely
1746 : * aborting a change for the most recent subtransactions.
1747 : *
1748 : * We can't use the binary search here as subxact XIDs won't
1749 : * necessarily arrive in sorted order, consider the case where we have
1750 : * released the savepoint for multiple subtransactions and then
1751 : * performed rollback to savepoint for one of the earlier
1752 : * sub-transaction.
1753 : */
1754 : int64 i;
1755 : int64 subidx;
1756 : BufFile *fd;
1757 26 : bool found = false;
1758 : char path[MAXPGPATH];
1759 :
1760 26 : subidx = -1;
1761 26 : begin_replication_step();
1762 26 : subxact_info_read(MyLogicalRepWorker->subid, xid);
1763 :
1764 30 : for (i = subxact_data.nsubxacts; i > 0; i--)
1765 : {
1766 22 : if (subxact_data.subxacts[i - 1].xid == subxid)
1767 : {
1768 18 : subidx = (i - 1);
1769 18 : found = true;
1770 18 : break;
1771 : }
1772 : }
1773 :
1774 : /*
1775 : * If it's an empty sub-transaction then we will not find the subxid
1776 : * here so just cleanup the subxact info and return.
1777 : */
1778 26 : if (!found)
1779 : {
1780 : /* Cleanup the subxact info */
1781 8 : cleanup_subxact_info();
1782 8 : end_replication_step();
1783 8 : CommitTransactionCommand();
1784 8 : return;
1785 : }
1786 :
1787 : /* open the changes file */
1788 18 : changes_filename(path, MyLogicalRepWorker->subid, xid);
1789 18 : fd = BufFileOpenFileSet(MyLogicalRepWorker->stream_fileset, path,
1790 : O_RDWR, false);
1791 :
1792 : /* OK, truncate the file at the right offset */
1793 18 : BufFileTruncateFileSet(fd, subxact_data.subxacts[subidx].fileno,
1794 18 : subxact_data.subxacts[subidx].offset);
1795 18 : BufFileClose(fd);
1796 :
1797 : /* discard the subxacts added later */
1798 18 : subxact_data.nsubxacts = subidx;
1799 :
1800 : /* write the updated subxact list */
1801 18 : subxact_info_write(MyLogicalRepWorker->subid, xid);
1802 :
1803 18 : end_replication_step();
1804 18 : CommitTransactionCommand();
1805 : }
1806 : }
1807 :
1808 : /*
1809 : * Handle STREAM ABORT message.
1810 : */
1811 : static void
1812 76 : apply_handle_stream_abort(StringInfo s)
1813 : {
1814 : TransactionId xid;
1815 : TransactionId subxid;
1816 : LogicalRepStreamAbortData abort_data;
1817 : ParallelApplyWorkerInfo *winfo;
1818 : TransApplyAction apply_action;
1819 :
1820 : /* Save the message before it is consumed. */
1821 76 : StringInfoData original_msg = *s;
1822 : bool toplevel_xact;
1823 :
1824 76 : if (in_streamed_transaction)
1825 0 : ereport(ERROR,
1826 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
1827 : errmsg_internal("STREAM ABORT message without STREAM STOP")));
1828 :
1829 : /* We receive abort information only when we can apply in parallel. */
1830 76 : logicalrep_read_stream_abort(s, &abort_data,
1831 76 : MyLogicalRepWorker->parallel_apply);
1832 :
1833 76 : xid = abort_data.xid;
1834 76 : subxid = abort_data.subxid;
1835 76 : toplevel_xact = (xid == subxid);
1836 :
1837 76 : set_apply_error_context_xact(subxid, abort_data.abort_lsn);
1838 :
1839 76 : apply_action = get_transaction_apply_action(xid, &winfo);
1840 :
1841 76 : switch (apply_action)
1842 : {
1843 28 : case TRANS_LEADER_APPLY:
1844 :
1845 : /*
1846 : * We are in the leader apply worker and the transaction has been
1847 : * serialized to file.
1848 : */
1849 28 : stream_abort_internal(xid, subxid);
1850 :
1851 28 : elog(DEBUG1, "finished processing the STREAM ABORT command");
1852 28 : break;
1853 :
1854 20 : case TRANS_LEADER_SEND_TO_PARALLEL:
1855 : Assert(winfo);
1856 :
1857 : /*
1858 : * For the case of aborting the subtransaction, we increment the
1859 : * number of streaming blocks and take the lock again before
1860 : * sending the STREAM_ABORT to ensure that the parallel apply
1861 : * worker will wait on the lock for the next set of changes after
1862 : * processing the STREAM_ABORT message if it is not already
1863 : * waiting for STREAM_STOP message.
1864 : *
1865 : * It is important to perform this locking before sending the
1866 : * STREAM_ABORT message so that the leader can hold the lock first
1867 : * and the parallel apply worker will wait for the leader to
1868 : * release the lock. This is the same as what we do in
1869 : * apply_handle_stream_stop. See Locking Considerations atop
1870 : * applyparallelworker.c.
1871 : */
1872 20 : if (!toplevel_xact)
1873 : {
1874 18 : pa_unlock_stream(xid, AccessExclusiveLock);
1875 18 : pg_atomic_add_fetch_u32(&winfo->shared->pending_stream_count, 1);
1876 18 : pa_lock_stream(xid, AccessExclusiveLock);
1877 : }
1878 :
1879 20 : if (pa_send_data(winfo, s->len, s->data))
1880 : {
1881 : /*
1882 : * Unlike STREAM_COMMIT and STREAM_PREPARE, we don't need to
1883 : * wait here for the parallel apply worker to finish as that
1884 : * is not required to maintain the commit order and won't have
1885 : * the risk of failures due to transaction dependencies and
1886 : * deadlocks. However, it is possible that before the parallel
1887 : * worker finishes and we clear the worker info, the xid
1888 : * wraparound happens on the upstream and a new transaction
1889 : * with the same xid can appear and that can lead to duplicate
1890 : * entries in ParallelApplyTxnHash. Yet another problem could
1891 : * be that we may have serialized the changes in partial
1892 : * serialize mode and the file containing xact changes may
1893 : * already exist, and after xid wraparound trying to create
1894 : * the file for the same xid can lead to an error. To avoid
1895 : * these problems, we decide to wait for the aborts to finish.
1896 : *
1897 : * Note, it is okay to not update the flush location position
1898 : * for aborts as in worst case that means such a transaction
1899 : * won't be sent again after restart.
1900 : */
1901 20 : if (toplevel_xact)
1902 2 : pa_xact_finish(winfo, InvalidXLogRecPtr);
1903 :
1904 20 : break;
1905 : }
1906 :
1907 : /*
1908 : * Switch to serialize mode when we are not able to send the
1909 : * change to parallel apply worker.
1910 : */
1911 0 : pa_switch_to_partial_serialize(winfo, true);
1912 :
1913 : /* fall through */
1914 4 : case TRANS_LEADER_PARTIAL_SERIALIZE:
1915 : Assert(winfo);
1916 :
1917 : /*
1918 : * Parallel apply worker might have applied some changes, so write
1919 : * the STREAM_ABORT message so that it can rollback the
1920 : * subtransaction if needed.
1921 : */
1922 4 : stream_open_and_write_change(xid, LOGICAL_REP_MSG_STREAM_ABORT,
1923 : &original_msg);
1924 :
1925 4 : if (toplevel_xact)
1926 : {
1927 2 : pa_set_fileset_state(winfo->shared, FS_SERIALIZE_DONE);
1928 2 : pa_xact_finish(winfo, InvalidXLogRecPtr);
1929 : }
1930 4 : break;
1931 :
1932 24 : case TRANS_PARALLEL_APPLY:
1933 :
1934 : /*
1935 : * If the parallel apply worker is applying spooled messages then
1936 : * close the file before aborting.
1937 : */
1938 24 : if (toplevel_xact && stream_fd)
1939 2 : stream_close_file();
1940 :
1941 24 : pa_stream_abort(&abort_data);
1942 :
1943 : /*
1944 : * We need to wait after processing rollback to savepoint for the
1945 : * next set of changes.
1946 : *
1947 : * We have a race condition here due to which we can start waiting
1948 : * here when there are more chunk of streams in the queue. See
1949 : * apply_handle_stream_stop.
1950 : */
1951 24 : if (!toplevel_xact)
1952 20 : pa_decr_and_wait_stream_block();
1953 :
1954 24 : elog(DEBUG1, "finished processing the STREAM ABORT command");
1955 24 : break;
1956 :
1957 0 : default:
1958 0 : elog(ERROR, "unexpected apply action: %d", (int) apply_action);
1959 : break;
1960 : }
1961 :
1962 76 : reset_apply_error_context_info();
1963 76 : }
1964 :
1965 : /*
1966 : * Ensure that the passed location is fileset's end.
1967 : */
1968 : static void
1969 8 : ensure_last_message(FileSet *stream_fileset, TransactionId xid, int fileno,
1970 : off_t offset)
1971 : {
1972 : char path[MAXPGPATH];
1973 : BufFile *fd;
1974 : int last_fileno;
1975 : off_t last_offset;
1976 :
1977 : Assert(!IsTransactionState());
1978 :
1979 8 : begin_replication_step();
1980 :
1981 8 : changes_filename(path, MyLogicalRepWorker->subid, xid);
1982 :
1983 8 : fd = BufFileOpenFileSet(stream_fileset, path, O_RDONLY, false);
1984 :
1985 8 : BufFileSeek(fd, 0, 0, SEEK_END);
1986 8 : BufFileTell(fd, &last_fileno, &last_offset);
1987 :
1988 8 : BufFileClose(fd);
1989 :
1990 8 : end_replication_step();
1991 :
1992 8 : if (last_fileno != fileno || last_offset != offset)
1993 0 : elog(ERROR, "unexpected message left in streaming transaction's changes file \"%s\"",
1994 : path);
1995 8 : }
1996 :
1997 : /*
1998 : * Common spoolfile processing.
1999 : */
2000 : void
2001 62 : apply_spooled_messages(FileSet *stream_fileset, TransactionId xid,
2002 : XLogRecPtr lsn)
2003 : {
2004 : int nchanges;
2005 : char path[MAXPGPATH];
2006 62 : char *buffer = NULL;
2007 : MemoryContext oldcxt;
2008 : ResourceOwner oldowner;
2009 : int fileno;
2010 : off_t offset;
2011 :
2012 62 : if (!am_parallel_apply_worker())
2013 54 : maybe_start_skipping_changes(lsn);
2014 :
2015 : /* Make sure we have an open transaction */
2016 62 : begin_replication_step();
2017 :
2018 : /*
2019 : * Allocate file handle and memory required to process all the messages in
2020 : * TopTransactionContext to avoid them getting reset after each message is
2021 : * processed.
2022 : */
2023 62 : oldcxt = MemoryContextSwitchTo(TopTransactionContext);
2024 :
2025 : /* Open the spool file for the committed/prepared transaction */
2026 62 : changes_filename(path, MyLogicalRepWorker->subid, xid);
2027 62 : elog(DEBUG1, "replaying changes from file \"%s\"", path);
2028 :
2029 : /*
2030 : * Make sure the file is owned by the toplevel transaction so that the
2031 : * file will not be accidentally closed when aborting a subtransaction.
2032 : */
2033 62 : oldowner = CurrentResourceOwner;
2034 62 : CurrentResourceOwner = TopTransactionResourceOwner;
2035 :
2036 62 : stream_fd = BufFileOpenFileSet(stream_fileset, path, O_RDONLY, false);
2037 :
2038 62 : CurrentResourceOwner = oldowner;
2039 :
2040 62 : buffer = palloc(BLCKSZ);
2041 :
2042 62 : MemoryContextSwitchTo(oldcxt);
2043 :
2044 62 : remote_final_lsn = lsn;
2045 :
2046 : /*
2047 : * Make sure the handle apply_dispatch methods are aware we're in a remote
2048 : * transaction.
2049 : */
2050 62 : in_remote_transaction = true;
2051 62 : pgstat_report_activity(STATE_RUNNING, NULL);
2052 :
2053 62 : end_replication_step();
2054 :
2055 : /*
2056 : * Read the entries one by one and pass them through the same logic as in
2057 : * apply_dispatch.
2058 : */
2059 62 : nchanges = 0;
2060 : while (true)
2061 176940 : {
2062 : StringInfoData s2;
2063 : size_t nbytes;
2064 : int len;
2065 :
2066 177002 : CHECK_FOR_INTERRUPTS();
2067 :
2068 : /* read length of the on-disk record */
2069 177002 : nbytes = BufFileReadMaybeEOF(stream_fd, &len, sizeof(len), true);
2070 :
2071 : /* have we reached end of the file? */
2072 177002 : if (nbytes == 0)
2073 52 : break;
2074 :
2075 : /* do we have a correct length? */
2076 176950 : if (len <= 0)
2077 0 : elog(ERROR, "incorrect length %d in streaming transaction's changes file \"%s\"",
2078 : len, path);
2079 :
2080 : /* make sure we have sufficiently large buffer */
2081 176950 : buffer = repalloc(buffer, len);
2082 :
2083 : /* and finally read the data into the buffer */
2084 176950 : BufFileReadExact(stream_fd, buffer, len);
2085 :
2086 176950 : BufFileTell(stream_fd, &fileno, &offset);
2087 :
2088 : /* init a stringinfo using the buffer and call apply_dispatch */
2089 176950 : initReadOnlyStringInfo(&s2, buffer, len);
2090 :
2091 : /* Ensure we are reading the data into our memory context. */
2092 176950 : oldcxt = MemoryContextSwitchTo(ApplyMessageContext);
2093 :
2094 176950 : apply_dispatch(&s2);
2095 :
2096 176948 : MemoryContextReset(ApplyMessageContext);
2097 :
2098 176948 : MemoryContextSwitchTo(oldcxt);
2099 :
2100 176948 : nchanges++;
2101 :
2102 : /*
2103 : * It is possible the file has been closed because we have processed
2104 : * the transaction end message like stream_commit in which case that
2105 : * must be the last message.
2106 : */
2107 176948 : if (!stream_fd)
2108 : {
2109 8 : ensure_last_message(stream_fileset, xid, fileno, offset);
2110 8 : break;
2111 : }
2112 :
2113 176940 : if (nchanges % 1000 == 0)
2114 168 : elog(DEBUG1, "replayed %d changes from file \"%s\"",
2115 : nchanges, path);
2116 : }
2117 :
2118 60 : if (stream_fd)
2119 52 : stream_close_file();
2120 :
2121 60 : elog(DEBUG1, "replayed %d (all) changes from file \"%s\"",
2122 : nchanges, path);
2123 :
2124 60 : return;
2125 : }
2126 :
2127 : /*
2128 : * Handle STREAM COMMIT message.
2129 : */
2130 : static void
2131 122 : apply_handle_stream_commit(StringInfo s)
2132 : {
2133 : TransactionId xid;
2134 : LogicalRepCommitData commit_data;
2135 : ParallelApplyWorkerInfo *winfo;
2136 : TransApplyAction apply_action;
2137 :
2138 : /* Save the message before it is consumed. */
2139 122 : StringInfoData original_msg = *s;
2140 :
2141 122 : if (in_streamed_transaction)
2142 0 : ereport(ERROR,
2143 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
2144 : errmsg_internal("STREAM COMMIT message without STREAM STOP")));
2145 :
2146 122 : xid = logicalrep_read_stream_commit(s, &commit_data);
2147 122 : set_apply_error_context_xact(xid, commit_data.commit_lsn);
2148 :
2149 122 : apply_action = get_transaction_apply_action(xid, &winfo);
2150 :
2151 122 : switch (apply_action)
2152 : {
2153 44 : case TRANS_LEADER_APPLY:
2154 :
2155 : /*
2156 : * The transaction has been serialized to file, so replay all the
2157 : * spooled operations.
2158 : */
2159 44 : apply_spooled_messages(MyLogicalRepWorker->stream_fileset, xid,
2160 : commit_data.commit_lsn);
2161 :
2162 42 : apply_handle_commit_internal(&commit_data);
2163 :
2164 : /* Unlink the files with serialized changes and subxact info. */
2165 42 : stream_cleanup_files(MyLogicalRepWorker->subid, xid);
2166 :
2167 42 : elog(DEBUG1, "finished processing the STREAM COMMIT command");
2168 42 : break;
2169 :
2170 36 : case TRANS_LEADER_SEND_TO_PARALLEL:
2171 : Assert(winfo);
2172 :
2173 36 : if (pa_send_data(winfo, s->len, s->data))
2174 : {
2175 : /* Finish processing the streaming transaction. */
2176 36 : pa_xact_finish(winfo, commit_data.end_lsn);
2177 34 : break;
2178 : }
2179 :
2180 : /*
2181 : * Switch to serialize mode when we are not able to send the
2182 : * change to parallel apply worker.
2183 : */
2184 0 : pa_switch_to_partial_serialize(winfo, true);
2185 :
2186 : /* fall through */
2187 4 : case TRANS_LEADER_PARTIAL_SERIALIZE:
2188 : Assert(winfo);
2189 :
2190 4 : stream_open_and_write_change(xid, LOGICAL_REP_MSG_STREAM_COMMIT,
2191 : &original_msg);
2192 :
2193 4 : pa_set_fileset_state(winfo->shared, FS_SERIALIZE_DONE);
2194 :
2195 : /* Finish processing the streaming transaction. */
2196 4 : pa_xact_finish(winfo, commit_data.end_lsn);
2197 4 : break;
2198 :
2199 38 : case TRANS_PARALLEL_APPLY:
2200 :
2201 : /*
2202 : * If the parallel apply worker is applying spooled messages then
2203 : * close the file before committing.
2204 : */
2205 38 : if (stream_fd)
2206 4 : stream_close_file();
2207 :
2208 38 : apply_handle_commit_internal(&commit_data);
2209 :
2210 38 : MyParallelShared->last_commit_end = XactLastCommitEnd;
2211 :
2212 : /*
2213 : * It is important to set the transaction state as finished before
2214 : * releasing the lock. See pa_wait_for_xact_finish.
2215 : */
2216 38 : pa_set_xact_state(MyParallelShared, PARALLEL_TRANS_FINISHED);
2217 38 : pa_unlock_transaction(xid, AccessExclusiveLock);
2218 :
2219 38 : pa_reset_subtrans();
2220 :
2221 38 : elog(DEBUG1, "finished processing the STREAM COMMIT command");
2222 38 : break;
2223 :
2224 0 : default:
2225 0 : elog(ERROR, "unexpected apply action: %d", (int) apply_action);
2226 : break;
2227 : }
2228 :
2229 : /* Process any tables that are being synchronized in parallel. */
2230 118 : process_syncing_tables(commit_data.end_lsn);
2231 :
2232 118 : pgstat_report_activity(STATE_IDLE, NULL);
2233 :
2234 118 : reset_apply_error_context_info();
2235 118 : }
2236 :
2237 : /*
2238 : * Helper function for apply_handle_commit and apply_handle_stream_commit.
2239 : */
2240 : static void
2241 836 : apply_handle_commit_internal(LogicalRepCommitData *commit_data)
2242 : {
2243 836 : if (is_skipping_changes())
2244 : {
2245 4 : stop_skipping_changes();
2246 :
2247 : /*
2248 : * Start a new transaction to clear the subskiplsn, if not started
2249 : * yet.
2250 : */
2251 4 : if (!IsTransactionState())
2252 2 : StartTransactionCommand();
2253 : }
2254 :
2255 836 : if (IsTransactionState())
2256 : {
2257 : /*
2258 : * The transaction is either non-empty or skipped, so we clear the
2259 : * subskiplsn.
2260 : */
2261 836 : clear_subscription_skip_lsn(commit_data->commit_lsn);
2262 :
2263 : /*
2264 : * Update origin state so we can restart streaming from correct
2265 : * position in case of crash.
2266 : */
2267 836 : replorigin_session_origin_lsn = commit_data->end_lsn;
2268 836 : replorigin_session_origin_timestamp = commit_data->committime;
2269 :
2270 836 : CommitTransactionCommand();
2271 :
2272 836 : if (IsTransactionBlock())
2273 : {
2274 8 : EndTransactionBlock(false);
2275 8 : CommitTransactionCommand();
2276 : }
2277 :
2278 836 : pgstat_report_stat(false);
2279 :
2280 836 : store_flush_position(commit_data->end_lsn, XactLastCommitEnd);
2281 : }
2282 : else
2283 : {
2284 : /* Process any invalidation messages that might have accumulated. */
2285 0 : AcceptInvalidationMessages();
2286 0 : maybe_reread_subscription();
2287 : }
2288 :
2289 836 : in_remote_transaction = false;
2290 836 : }
2291 :
2292 : /*
2293 : * Handle RELATION message.
2294 : *
2295 : * Note we don't do validation against local schema here. The validation
2296 : * against local schema is postponed until first change for given relation
2297 : * comes as we only care about it when applying changes for it anyway and we
2298 : * do less locking this way.
2299 : */
2300 : static void
2301 828 : apply_handle_relation(StringInfo s)
2302 : {
2303 : LogicalRepRelation *rel;
2304 :
2305 828 : if (handle_streamed_transaction(LOGICAL_REP_MSG_RELATION, s))
2306 72 : return;
2307 :
2308 756 : rel = logicalrep_read_rel(s);
2309 756 : logicalrep_relmap_update(rel);
2310 :
2311 : /* Also reset all entries in the partition map that refer to remoterel. */
2312 756 : logicalrep_partmap_reset_relmap(rel);
2313 : }
2314 :
2315 : /*
2316 : * Handle TYPE message.
2317 : *
2318 : * This implementation pays no attention to TYPE messages; we expect the user
2319 : * to have set things up so that the incoming data is acceptable to the input
2320 : * functions for the locally subscribed tables. Hence, we just read and
2321 : * discard the message.
2322 : */
2323 : static void
2324 36 : apply_handle_type(StringInfo s)
2325 : {
2326 : LogicalRepTyp typ;
2327 :
2328 36 : if (handle_streamed_transaction(LOGICAL_REP_MSG_TYPE, s))
2329 0 : return;
2330 :
2331 36 : logicalrep_read_typ(s, &typ);
2332 : }
2333 :
2334 : /*
2335 : * Check that we (the subscription owner) have sufficient privileges on the
2336 : * target relation to perform the given operation.
2337 : */
2338 : static void
2339 441368 : TargetPrivilegesCheck(Relation rel, AclMode mode)
2340 : {
2341 : Oid relid;
2342 : AclResult aclresult;
2343 :
2344 441368 : relid = RelationGetRelid(rel);
2345 441368 : aclresult = pg_class_aclcheck(relid, GetUserId(), mode);
2346 441368 : if (aclresult != ACLCHECK_OK)
2347 14 : aclcheck_error(aclresult,
2348 14 : get_relkind_objtype(rel->rd_rel->relkind),
2349 14 : get_rel_name(relid));
2350 :
2351 : /*
2352 : * We lack the infrastructure to honor RLS policies. It might be possible
2353 : * to add such infrastructure here, but tablesync workers lack it, too, so
2354 : * we don't bother. RLS does not ordinarily apply to TRUNCATE commands,
2355 : * but it seems dangerous to replicate a TRUNCATE and then refuse to
2356 : * replicate subsequent INSERTs, so we forbid all commands the same.
2357 : */
2358 441354 : if (check_enable_rls(relid, InvalidOid, false) == RLS_ENABLED)
2359 6 : ereport(ERROR,
2360 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2361 : errmsg("user \"%s\" cannot replicate into relation with row-level security enabled: \"%s\"",
2362 : GetUserNameFromId(GetUserId(), true),
2363 : RelationGetRelationName(rel))));
2364 441348 : }
2365 :
2366 : /*
2367 : * Handle INSERT message.
2368 : */
2369 :
2370 : static void
2371 372544 : apply_handle_insert(StringInfo s)
2372 : {
2373 : LogicalRepRelMapEntry *rel;
2374 : LogicalRepTupleData newtup;
2375 : LogicalRepRelId relid;
2376 : UserContext ucxt;
2377 : ApplyExecutionData *edata;
2378 : EState *estate;
2379 : TupleTableSlot *remoteslot;
2380 : MemoryContext oldctx;
2381 : bool run_as_owner;
2382 :
2383 : /*
2384 : * Quick return if we are skipping data modification changes or handling
2385 : * streamed transactions.
2386 : */
2387 725084 : if (is_skipping_changes() ||
2388 352540 : handle_streamed_transaction(LOGICAL_REP_MSG_INSERT, s))
2389 220114 : return;
2390 :
2391 152528 : begin_replication_step();
2392 :
2393 152526 : relid = logicalrep_read_insert(s, &newtup);
2394 152526 : rel = logicalrep_rel_open(relid, RowExclusiveLock);
2395 152512 : if (!should_apply_changes_for_rel(rel))
2396 : {
2397 : /*
2398 : * The relation can't become interesting in the middle of the
2399 : * transaction so it's safe to unlock it.
2400 : */
2401 98 : logicalrep_rel_close(rel, RowExclusiveLock);
2402 98 : end_replication_step();
2403 98 : return;
2404 : }
2405 :
2406 : /*
2407 : * Make sure that any user-supplied code runs as the table owner, unless
2408 : * the user has opted out of that behavior.
2409 : */
2410 152414 : run_as_owner = MySubscription->runasowner;
2411 152414 : if (!run_as_owner)
2412 152398 : SwitchToUntrustedUser(rel->localrel->rd_rel->relowner, &ucxt);
2413 :
2414 : /* Set relation for error callback */
2415 152414 : apply_error_callback_arg.rel = rel;
2416 :
2417 : /* Initialize the executor state. */
2418 152414 : edata = create_edata_for_relation(rel);
2419 152414 : estate = edata->estate;
2420 152414 : remoteslot = ExecInitExtraTupleSlot(estate,
2421 152414 : RelationGetDescr(rel->localrel),
2422 : &TTSOpsVirtual);
2423 :
2424 : /* Process and store remote tuple in the slot */
2425 152414 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
2426 152414 : slot_store_data(remoteslot, rel, &newtup);
2427 152414 : slot_fill_defaults(rel, estate, remoteslot);
2428 152414 : MemoryContextSwitchTo(oldctx);
2429 :
2430 : /* For a partitioned table, insert the tuple into a partition. */
2431 152414 : if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
2432 88 : apply_handle_tuple_routing(edata,
2433 : remoteslot, NULL, CMD_INSERT);
2434 : else
2435 152326 : apply_handle_insert_internal(edata, edata->targetRelInfo,
2436 : remoteslot);
2437 :
2438 152386 : finish_edata(edata);
2439 :
2440 : /* Reset relation for error callback */
2441 152386 : apply_error_callback_arg.rel = NULL;
2442 :
2443 152386 : if (!run_as_owner)
2444 152376 : RestoreUserContext(&ucxt);
2445 :
2446 152386 : logicalrep_rel_close(rel, NoLock);
2447 :
2448 152386 : end_replication_step();
2449 : }
2450 :
2451 : /*
2452 : * Workhorse for apply_handle_insert()
2453 : * relinfo is for the relation we're actually inserting into
2454 : * (could be a child partition of edata->targetRelInfo)
2455 : */
2456 : static void
2457 152416 : apply_handle_insert_internal(ApplyExecutionData *edata,
2458 : ResultRelInfo *relinfo,
2459 : TupleTableSlot *remoteslot)
2460 : {
2461 152416 : EState *estate = edata->estate;
2462 :
2463 : /* We must open indexes here. */
2464 152416 : ExecOpenIndices(relinfo, false);
2465 :
2466 : /* Do the insert. */
2467 152416 : TargetPrivilegesCheck(relinfo->ri_RelationDesc, ACL_INSERT);
2468 152404 : ExecSimpleRelationInsert(relinfo, estate, remoteslot);
2469 :
2470 : /* Cleanup. */
2471 152388 : ExecCloseIndices(relinfo);
2472 152388 : }
2473 :
2474 : /*
2475 : * Check if the logical replication relation is updatable and throw
2476 : * appropriate error if it isn't.
2477 : */
2478 : static void
2479 144512 : check_relation_updatable(LogicalRepRelMapEntry *rel)
2480 : {
2481 : /*
2482 : * For partitioned tables, we only need to care if the target partition is
2483 : * updatable (aka has PK or RI defined for it).
2484 : */
2485 144512 : if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
2486 58 : return;
2487 :
2488 : /* Updatable, no error. */
2489 144454 : if (rel->updatable)
2490 144454 : return;
2491 :
2492 : /*
2493 : * We are in error mode so it's fine this is somewhat slow. It's better to
2494 : * give user correct error.
2495 : */
2496 0 : if (OidIsValid(GetRelationIdentityOrPK(rel->localrel)))
2497 : {
2498 0 : ereport(ERROR,
2499 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
2500 : errmsg("publisher did not send replica identity column "
2501 : "expected by the logical replication target relation \"%s.%s\"",
2502 : rel->remoterel.nspname, rel->remoterel.relname)));
2503 : }
2504 :
2505 0 : ereport(ERROR,
2506 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
2507 : errmsg("logical replication target relation \"%s.%s\" has "
2508 : "neither REPLICA IDENTITY index nor PRIMARY "
2509 : "KEY and published relation does not have "
2510 : "REPLICA IDENTITY FULL",
2511 : rel->remoterel.nspname, rel->remoterel.relname)));
2512 : }
2513 :
2514 : /*
2515 : * Handle UPDATE message.
2516 : *
2517 : * TODO: FDW support
2518 : */
2519 : static void
2520 132286 : apply_handle_update(StringInfo s)
2521 : {
2522 : LogicalRepRelMapEntry *rel;
2523 : LogicalRepRelId relid;
2524 : UserContext ucxt;
2525 : ApplyExecutionData *edata;
2526 : EState *estate;
2527 : LogicalRepTupleData oldtup;
2528 : LogicalRepTupleData newtup;
2529 : bool has_oldtup;
2530 : TupleTableSlot *remoteslot;
2531 : RTEPermissionInfo *target_perminfo;
2532 : MemoryContext oldctx;
2533 : bool run_as_owner;
2534 :
2535 : /*
2536 : * Quick return if we are skipping data modification changes or handling
2537 : * streamed transactions.
2538 : */
2539 264572 : if (is_skipping_changes() ||
2540 132286 : handle_streamed_transaction(LOGICAL_REP_MSG_UPDATE, s))
2541 68440 : return;
2542 :
2543 63846 : begin_replication_step();
2544 :
2545 63844 : relid = logicalrep_read_update(s, &has_oldtup, &oldtup,
2546 : &newtup);
2547 63844 : rel = logicalrep_rel_open(relid, RowExclusiveLock);
2548 63844 : if (!should_apply_changes_for_rel(rel))
2549 : {
2550 : /*
2551 : * The relation can't become interesting in the middle of the
2552 : * transaction so it's safe to unlock it.
2553 : */
2554 0 : logicalrep_rel_close(rel, RowExclusiveLock);
2555 0 : end_replication_step();
2556 0 : return;
2557 : }
2558 :
2559 : /* Set relation for error callback */
2560 63844 : apply_error_callback_arg.rel = rel;
2561 :
2562 : /* Check if we can do the update. */
2563 63844 : check_relation_updatable(rel);
2564 :
2565 : /*
2566 : * Make sure that any user-supplied code runs as the table owner, unless
2567 : * the user has opted out of that behavior.
2568 : */
2569 63844 : run_as_owner = MySubscription->runasowner;
2570 63844 : if (!run_as_owner)
2571 63838 : SwitchToUntrustedUser(rel->localrel->rd_rel->relowner, &ucxt);
2572 :
2573 : /* Initialize the executor state. */
2574 63842 : edata = create_edata_for_relation(rel);
2575 63842 : estate = edata->estate;
2576 63842 : remoteslot = ExecInitExtraTupleSlot(estate,
2577 63842 : RelationGetDescr(rel->localrel),
2578 : &TTSOpsVirtual);
2579 :
2580 : /*
2581 : * Populate updatedCols so that per-column triggers can fire, and so
2582 : * executor can correctly pass down indexUnchanged hint. This could
2583 : * include more columns than were actually changed on the publisher
2584 : * because the logical replication protocol doesn't contain that
2585 : * information. But it would for example exclude columns that only exist
2586 : * on the subscriber, since we are not touching those.
2587 : */
2588 63842 : target_perminfo = list_nth(estate->es_rteperminfos, 0);
2589 318514 : for (int i = 0; i < remoteslot->tts_tupleDescriptor->natts; i++)
2590 : {
2591 254672 : Form_pg_attribute att = TupleDescAttr(remoteslot->tts_tupleDescriptor, i);
2592 254672 : int remoteattnum = rel->attrmap->attnums[i];
2593 :
2594 254672 : if (!att->attisdropped && remoteattnum >= 0)
2595 : {
2596 : Assert(remoteattnum < newtup.ncols);
2597 137640 : if (newtup.colstatus[remoteattnum] != LOGICALREP_COLUMN_UNCHANGED)
2598 137634 : target_perminfo->updatedCols =
2599 137634 : bms_add_member(target_perminfo->updatedCols,
2600 : i + 1 - FirstLowInvalidHeapAttributeNumber);
2601 : }
2602 : }
2603 :
2604 : /* Build the search tuple. */
2605 63842 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
2606 63842 : slot_store_data(remoteslot, rel,
2607 63842 : has_oldtup ? &oldtup : &newtup);
2608 63842 : MemoryContextSwitchTo(oldctx);
2609 :
2610 : /* For a partitioned table, apply update to correct partition. */
2611 63842 : if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
2612 24 : apply_handle_tuple_routing(edata,
2613 : remoteslot, &newtup, CMD_UPDATE);
2614 : else
2615 63818 : apply_handle_update_internal(edata, edata->targetRelInfo,
2616 : remoteslot, &newtup, rel->localindexoid);
2617 :
2618 63834 : finish_edata(edata);
2619 :
2620 : /* Reset relation for error callback */
2621 63834 : apply_error_callback_arg.rel = NULL;
2622 :
2623 63834 : if (!run_as_owner)
2624 63830 : RestoreUserContext(&ucxt);
2625 :
2626 63834 : logicalrep_rel_close(rel, NoLock);
2627 :
2628 63834 : end_replication_step();
2629 : }
2630 :
2631 : /*
2632 : * Workhorse for apply_handle_update()
2633 : * relinfo is for the relation we're actually updating in
2634 : * (could be a child partition of edata->targetRelInfo)
2635 : */
2636 : static void
2637 63818 : apply_handle_update_internal(ApplyExecutionData *edata,
2638 : ResultRelInfo *relinfo,
2639 : TupleTableSlot *remoteslot,
2640 : LogicalRepTupleData *newtup,
2641 : Oid localindexoid)
2642 : {
2643 63818 : EState *estate = edata->estate;
2644 63818 : LogicalRepRelMapEntry *relmapentry = edata->targetRel;
2645 63818 : Relation localrel = relinfo->ri_RelationDesc;
2646 : EPQState epqstate;
2647 : TupleTableSlot *localslot;
2648 : bool found;
2649 : MemoryContext oldctx;
2650 :
2651 63818 : EvalPlanQualInit(&epqstate, estate, NULL, NIL, -1, NIL);
2652 63818 : ExecOpenIndices(relinfo, false);
2653 :
2654 63818 : found = FindReplTupleInLocalRel(edata, localrel,
2655 : &relmapentry->remoterel,
2656 : localindexoid,
2657 : remoteslot, &localslot);
2658 63810 : ExecClearTuple(remoteslot);
2659 :
2660 : /*
2661 : * Tuple found.
2662 : *
2663 : * Note this will fail if there are other conflicting unique indexes.
2664 : */
2665 63810 : if (found)
2666 : {
2667 : /* Process and store remote tuple in the slot */
2668 63808 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
2669 63808 : slot_modify_data(remoteslot, localslot, relmapentry, newtup);
2670 63808 : MemoryContextSwitchTo(oldctx);
2671 :
2672 63808 : EvalPlanQualSetSlot(&epqstate, remoteslot);
2673 :
2674 : /* Do the actual update. */
2675 63808 : TargetPrivilegesCheck(relinfo->ri_RelationDesc, ACL_UPDATE);
2676 63808 : ExecSimpleRelationUpdate(relinfo, estate, &epqstate, localslot,
2677 : remoteslot);
2678 : }
2679 : else
2680 : {
2681 : /*
2682 : * The tuple to be updated could not be found. Do nothing except for
2683 : * emitting a log message.
2684 : *
2685 : * XXX should this be promoted to ereport(LOG) perhaps?
2686 : */
2687 2 : elog(DEBUG1,
2688 : "logical replication did not find row to be updated "
2689 : "in replication target relation \"%s\"",
2690 : RelationGetRelationName(localrel));
2691 : }
2692 :
2693 : /* Cleanup. */
2694 63810 : ExecCloseIndices(relinfo);
2695 63810 : EvalPlanQualEnd(&epqstate);
2696 63810 : }
2697 :
2698 : /*
2699 : * Handle DELETE message.
2700 : *
2701 : * TODO: FDW support
2702 : */
2703 : static void
2704 163840 : apply_handle_delete(StringInfo s)
2705 : {
2706 : LogicalRepRelMapEntry *rel;
2707 : LogicalRepTupleData oldtup;
2708 : LogicalRepRelId relid;
2709 : UserContext ucxt;
2710 : ApplyExecutionData *edata;
2711 : EState *estate;
2712 : TupleTableSlot *remoteslot;
2713 : MemoryContext oldctx;
2714 : bool run_as_owner;
2715 :
2716 : /*
2717 : * Quick return if we are skipping data modification changes or handling
2718 : * streamed transactions.
2719 : */
2720 327680 : if (is_skipping_changes() ||
2721 163840 : handle_streamed_transaction(LOGICAL_REP_MSG_DELETE, s))
2722 83230 : return;
2723 :
2724 80610 : begin_replication_step();
2725 :
2726 80610 : relid = logicalrep_read_delete(s, &oldtup);
2727 80610 : rel = logicalrep_rel_open(relid, RowExclusiveLock);
2728 80610 : if (!should_apply_changes_for_rel(rel))
2729 : {
2730 : /*
2731 : * The relation can't become interesting in the middle of the
2732 : * transaction so it's safe to unlock it.
2733 : */
2734 0 : logicalrep_rel_close(rel, RowExclusiveLock);
2735 0 : end_replication_step();
2736 0 : return;
2737 : }
2738 :
2739 : /* Set relation for error callback */
2740 80610 : apply_error_callback_arg.rel = rel;
2741 :
2742 : /* Check if we can do the delete. */
2743 80610 : check_relation_updatable(rel);
2744 :
2745 : /*
2746 : * Make sure that any user-supplied code runs as the table owner, unless
2747 : * the user has opted out of that behavior.
2748 : */
2749 80610 : run_as_owner = MySubscription->runasowner;
2750 80610 : if (!run_as_owner)
2751 80606 : SwitchToUntrustedUser(rel->localrel->rd_rel->relowner, &ucxt);
2752 :
2753 : /* Initialize the executor state. */
2754 80610 : edata = create_edata_for_relation(rel);
2755 80610 : estate = edata->estate;
2756 80610 : remoteslot = ExecInitExtraTupleSlot(estate,
2757 80610 : RelationGetDescr(rel->localrel),
2758 : &TTSOpsVirtual);
2759 :
2760 : /* Build the search tuple. */
2761 80610 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
2762 80610 : slot_store_data(remoteslot, rel, &oldtup);
2763 80610 : MemoryContextSwitchTo(oldctx);
2764 :
2765 : /* For a partitioned table, apply delete to correct partition. */
2766 80610 : if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
2767 34 : apply_handle_tuple_routing(edata,
2768 : remoteslot, NULL, CMD_DELETE);
2769 : else
2770 80576 : apply_handle_delete_internal(edata, edata->targetRelInfo,
2771 : remoteslot, rel->localindexoid);
2772 :
2773 80610 : finish_edata(edata);
2774 :
2775 : /* Reset relation for error callback */
2776 80610 : apply_error_callback_arg.rel = NULL;
2777 :
2778 80610 : if (!run_as_owner)
2779 80606 : RestoreUserContext(&ucxt);
2780 :
2781 80610 : logicalrep_rel_close(rel, NoLock);
2782 :
2783 80610 : end_replication_step();
2784 : }
2785 :
2786 : /*
2787 : * Workhorse for apply_handle_delete()
2788 : * relinfo is for the relation we're actually deleting from
2789 : * (could be a child partition of edata->targetRelInfo)
2790 : */
2791 : static void
2792 80612 : apply_handle_delete_internal(ApplyExecutionData *edata,
2793 : ResultRelInfo *relinfo,
2794 : TupleTableSlot *remoteslot,
2795 : Oid localindexoid)
2796 : {
2797 80612 : EState *estate = edata->estate;
2798 80612 : Relation localrel = relinfo->ri_RelationDesc;
2799 80612 : LogicalRepRelation *remoterel = &edata->targetRel->remoterel;
2800 : EPQState epqstate;
2801 : TupleTableSlot *localslot;
2802 : bool found;
2803 :
2804 80612 : EvalPlanQualInit(&epqstate, estate, NULL, NIL, -1, NIL);
2805 80612 : ExecOpenIndices(relinfo, false);
2806 :
2807 80612 : found = FindReplTupleInLocalRel(edata, localrel, remoterel, localindexoid,
2808 : remoteslot, &localslot);
2809 :
2810 : /* If found delete it. */
2811 80612 : if (found)
2812 : {
2813 80602 : EvalPlanQualSetSlot(&epqstate, localslot);
2814 :
2815 : /* Do the actual delete. */
2816 80602 : TargetPrivilegesCheck(relinfo->ri_RelationDesc, ACL_DELETE);
2817 80602 : ExecSimpleRelationDelete(relinfo, estate, &epqstate, localslot);
2818 : }
2819 : else
2820 : {
2821 : /*
2822 : * The tuple to be deleted could not be found. Do nothing except for
2823 : * emitting a log message.
2824 : *
2825 : * XXX should this be promoted to ereport(LOG) perhaps?
2826 : */
2827 10 : elog(DEBUG1,
2828 : "logical replication did not find row to be deleted "
2829 : "in replication target relation \"%s\"",
2830 : RelationGetRelationName(localrel));
2831 : }
2832 :
2833 : /* Cleanup. */
2834 80612 : ExecCloseIndices(relinfo);
2835 80612 : EvalPlanQualEnd(&epqstate);
2836 80612 : }
2837 :
2838 : /*
2839 : * Try to find a tuple received from the publication side (in 'remoteslot') in
2840 : * the corresponding local relation using either replica identity index,
2841 : * primary key, index or if needed, sequential scan.
2842 : *
2843 : * Local tuple, if found, is returned in '*localslot'.
2844 : */
2845 : static bool
2846 144454 : FindReplTupleInLocalRel(ApplyExecutionData *edata, Relation localrel,
2847 : LogicalRepRelation *remoterel,
2848 : Oid localidxoid,
2849 : TupleTableSlot *remoteslot,
2850 : TupleTableSlot **localslot)
2851 : {
2852 144454 : EState *estate = edata->estate;
2853 : bool found;
2854 :
2855 : /*
2856 : * Regardless of the top-level operation, we're performing a read here, so
2857 : * check for SELECT privileges.
2858 : */
2859 144454 : TargetPrivilegesCheck(localrel, ACL_SELECT);
2860 :
2861 144446 : *localslot = table_slot_create(localrel, &estate->es_tupleTable);
2862 :
2863 : Assert(OidIsValid(localidxoid) ||
2864 : (remoterel->replident == REPLICA_IDENTITY_FULL));
2865 :
2866 144446 : if (OidIsValid(localidxoid))
2867 : {
2868 : #ifdef USE_ASSERT_CHECKING
2869 : Relation idxrel = index_open(localidxoid, AccessShareLock);
2870 :
2871 : /* Index must be PK, RI, or usable for REPLICA IDENTITY FULL tables */
2872 : Assert(GetRelationIdentityOrPK(idxrel) == localidxoid ||
2873 : IsIndexUsableForReplicaIdentityFull(BuildIndexInfo(idxrel),
2874 : edata->targetRel->attrmap));
2875 : index_close(idxrel, AccessShareLock);
2876 : #endif
2877 :
2878 144154 : found = RelationFindReplTupleByIndex(localrel, localidxoid,
2879 : LockTupleExclusive,
2880 : remoteslot, *localslot);
2881 : }
2882 : else
2883 292 : found = RelationFindReplTupleSeq(localrel, LockTupleExclusive,
2884 : remoteslot, *localslot);
2885 :
2886 144446 : return found;
2887 : }
2888 :
2889 : /*
2890 : * This handles insert, update, delete on a partitioned table.
2891 : */
2892 : static void
2893 146 : apply_handle_tuple_routing(ApplyExecutionData *edata,
2894 : TupleTableSlot *remoteslot,
2895 : LogicalRepTupleData *newtup,
2896 : CmdType operation)
2897 : {
2898 146 : EState *estate = edata->estate;
2899 146 : LogicalRepRelMapEntry *relmapentry = edata->targetRel;
2900 146 : ResultRelInfo *relinfo = edata->targetRelInfo;
2901 146 : Relation parentrel = relinfo->ri_RelationDesc;
2902 : ModifyTableState *mtstate;
2903 : PartitionTupleRouting *proute;
2904 : ResultRelInfo *partrelinfo;
2905 : Relation partrel;
2906 : TupleTableSlot *remoteslot_part;
2907 : TupleConversionMap *map;
2908 : MemoryContext oldctx;
2909 146 : LogicalRepRelMapEntry *part_entry = NULL;
2910 146 : AttrMap *attrmap = NULL;
2911 :
2912 : /* ModifyTableState is needed for ExecFindPartition(). */
2913 146 : edata->mtstate = mtstate = makeNode(ModifyTableState);
2914 146 : mtstate->ps.plan = NULL;
2915 146 : mtstate->ps.state = estate;
2916 146 : mtstate->operation = operation;
2917 146 : mtstate->resultRelInfo = relinfo;
2918 :
2919 : /* ... as is PartitionTupleRouting. */
2920 146 : edata->proute = proute = ExecSetupPartitionTupleRouting(estate, parentrel);
2921 :
2922 : /*
2923 : * Find the partition to which the "search tuple" belongs.
2924 : */
2925 : Assert(remoteslot != NULL);
2926 146 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
2927 146 : partrelinfo = ExecFindPartition(mtstate, relinfo, proute,
2928 : remoteslot, estate);
2929 : Assert(partrelinfo != NULL);
2930 146 : partrel = partrelinfo->ri_RelationDesc;
2931 :
2932 : /*
2933 : * Check for supported relkind. We need this since partitions might be of
2934 : * unsupported relkinds; and the set of partitions can change, so checking
2935 : * at CREATE/ALTER SUBSCRIPTION would be insufficient.
2936 : */
2937 146 : CheckSubscriptionRelkind(partrel->rd_rel->relkind,
2938 146 : get_namespace_name(RelationGetNamespace(partrel)),
2939 146 : RelationGetRelationName(partrel));
2940 :
2941 : /*
2942 : * To perform any of the operations below, the tuple must match the
2943 : * partition's rowtype. Convert if needed or just copy, using a dedicated
2944 : * slot to store the tuple in any case.
2945 : */
2946 146 : remoteslot_part = partrelinfo->ri_PartitionTupleSlot;
2947 146 : if (remoteslot_part == NULL)
2948 82 : remoteslot_part = table_slot_create(partrel, &estate->es_tupleTable);
2949 146 : map = ExecGetRootToChildMap(partrelinfo, estate);
2950 146 : if (map != NULL)
2951 : {
2952 64 : attrmap = map->attrMap;
2953 64 : remoteslot_part = execute_attr_map_slot(attrmap, remoteslot,
2954 : remoteslot_part);
2955 : }
2956 : else
2957 : {
2958 82 : remoteslot_part = ExecCopySlot(remoteslot_part, remoteslot);
2959 82 : slot_getallattrs(remoteslot_part);
2960 : }
2961 146 : MemoryContextSwitchTo(oldctx);
2962 :
2963 : /* Check if we can do the update or delete on the leaf partition. */
2964 146 : if (operation == CMD_UPDATE || operation == CMD_DELETE)
2965 : {
2966 58 : part_entry = logicalrep_partition_open(relmapentry, partrel,
2967 : attrmap);
2968 58 : check_relation_updatable(part_entry);
2969 : }
2970 :
2971 146 : switch (operation)
2972 : {
2973 88 : case CMD_INSERT:
2974 88 : apply_handle_insert_internal(edata, partrelinfo,
2975 : remoteslot_part);
2976 88 : break;
2977 :
2978 34 : case CMD_DELETE:
2979 34 : apply_handle_delete_internal(edata, partrelinfo,
2980 : remoteslot_part,
2981 : part_entry->localindexoid);
2982 34 : break;
2983 :
2984 24 : case CMD_UPDATE:
2985 :
2986 : /*
2987 : * For UPDATE, depending on whether or not the updated tuple
2988 : * satisfies the partition's constraint, perform a simple UPDATE
2989 : * of the partition or move the updated tuple into a different
2990 : * suitable partition.
2991 : */
2992 : {
2993 : TupleTableSlot *localslot;
2994 : ResultRelInfo *partrelinfo_new;
2995 : Relation partrel_new;
2996 : bool found;
2997 :
2998 : /* Get the matching local tuple from the partition. */
2999 24 : found = FindReplTupleInLocalRel(edata, partrel,
3000 : &part_entry->remoterel,
3001 : part_entry->localindexoid,
3002 : remoteslot_part, &localslot);
3003 24 : if (!found)
3004 : {
3005 : /*
3006 : * The tuple to be updated could not be found. Do nothing
3007 : * except for emitting a log message.
3008 : *
3009 : * XXX should this be promoted to ereport(LOG) perhaps?
3010 : */
3011 4 : elog(DEBUG1,
3012 : "logical replication did not find row to be updated "
3013 : "in replication target relation's partition \"%s\"",
3014 : RelationGetRelationName(partrel));
3015 4 : return;
3016 : }
3017 :
3018 : /*
3019 : * Apply the update to the local tuple, putting the result in
3020 : * remoteslot_part.
3021 : */
3022 20 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
3023 20 : slot_modify_data(remoteslot_part, localslot, part_entry,
3024 : newtup);
3025 20 : MemoryContextSwitchTo(oldctx);
3026 :
3027 : /*
3028 : * Does the updated tuple still satisfy the current
3029 : * partition's constraint?
3030 : */
3031 40 : if (!partrel->rd_rel->relispartition ||
3032 20 : ExecPartitionCheck(partrelinfo, remoteslot_part, estate,
3033 : false))
3034 18 : {
3035 : /*
3036 : * Yes, so simply UPDATE the partition. We don't call
3037 : * apply_handle_update_internal() here, which would
3038 : * normally do the following work, to avoid repeating some
3039 : * work already done above to find the local tuple in the
3040 : * partition.
3041 : */
3042 : EPQState epqstate;
3043 :
3044 18 : EvalPlanQualInit(&epqstate, estate, NULL, NIL, -1, NIL);
3045 18 : ExecOpenIndices(partrelinfo, false);
3046 :
3047 18 : EvalPlanQualSetSlot(&epqstate, remoteslot_part);
3048 18 : TargetPrivilegesCheck(partrelinfo->ri_RelationDesc,
3049 : ACL_UPDATE);
3050 18 : ExecSimpleRelationUpdate(partrelinfo, estate, &epqstate,
3051 : localslot, remoteslot_part);
3052 18 : ExecCloseIndices(partrelinfo);
3053 18 : EvalPlanQualEnd(&epqstate);
3054 : }
3055 : else
3056 : {
3057 : /* Move the tuple into the new partition. */
3058 :
3059 : /*
3060 : * New partition will be found using tuple routing, which
3061 : * can only occur via the parent table. We might need to
3062 : * convert the tuple to the parent's rowtype. Note that
3063 : * this is the tuple found in the partition, not the
3064 : * original search tuple received by this function.
3065 : */
3066 2 : if (map)
3067 : {
3068 : TupleConversionMap *PartitionToRootMap =
3069 2 : convert_tuples_by_name(RelationGetDescr(partrel),
3070 : RelationGetDescr(parentrel));
3071 :
3072 : remoteslot =
3073 2 : execute_attr_map_slot(PartitionToRootMap->attrMap,
3074 : remoteslot_part, remoteslot);
3075 : }
3076 : else
3077 : {
3078 0 : remoteslot = ExecCopySlot(remoteslot, remoteslot_part);
3079 0 : slot_getallattrs(remoteslot);
3080 : }
3081 :
3082 : /* Find the new partition. */
3083 2 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
3084 2 : partrelinfo_new = ExecFindPartition(mtstate, relinfo,
3085 : proute, remoteslot,
3086 : estate);
3087 2 : MemoryContextSwitchTo(oldctx);
3088 : Assert(partrelinfo_new != partrelinfo);
3089 2 : partrel_new = partrelinfo_new->ri_RelationDesc;
3090 :
3091 : /* Check that new partition also has supported relkind. */
3092 2 : CheckSubscriptionRelkind(partrel_new->rd_rel->relkind,
3093 2 : get_namespace_name(RelationGetNamespace(partrel_new)),
3094 2 : RelationGetRelationName(partrel_new));
3095 :
3096 : /* DELETE old tuple found in the old partition. */
3097 2 : apply_handle_delete_internal(edata, partrelinfo,
3098 : localslot,
3099 : part_entry->localindexoid);
3100 :
3101 : /* INSERT new tuple into the new partition. */
3102 :
3103 : /*
3104 : * Convert the replacement tuple to match the destination
3105 : * partition rowtype.
3106 : */
3107 2 : oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
3108 2 : remoteslot_part = partrelinfo_new->ri_PartitionTupleSlot;
3109 2 : if (remoteslot_part == NULL)
3110 2 : remoteslot_part = table_slot_create(partrel_new,
3111 : &estate->es_tupleTable);
3112 2 : map = ExecGetRootToChildMap(partrelinfo_new, estate);
3113 2 : if (map != NULL)
3114 : {
3115 0 : remoteslot_part = execute_attr_map_slot(map->attrMap,
3116 : remoteslot,
3117 : remoteslot_part);
3118 : }
3119 : else
3120 : {
3121 2 : remoteslot_part = ExecCopySlot(remoteslot_part,
3122 : remoteslot);
3123 2 : slot_getallattrs(remoteslot);
3124 : }
3125 2 : MemoryContextSwitchTo(oldctx);
3126 2 : apply_handle_insert_internal(edata, partrelinfo_new,
3127 : remoteslot_part);
3128 : }
3129 : }
3130 20 : break;
3131 :
3132 0 : default:
3133 0 : elog(ERROR, "unrecognized CmdType: %d", (int) operation);
3134 : break;
3135 : }
3136 : }
3137 :
3138 : /*
3139 : * Handle TRUNCATE message.
3140 : *
3141 : * TODO: FDW support
3142 : */
3143 : static void
3144 38 : apply_handle_truncate(StringInfo s)
3145 : {
3146 38 : bool cascade = false;
3147 38 : bool restart_seqs = false;
3148 38 : List *remote_relids = NIL;
3149 38 : List *remote_rels = NIL;
3150 38 : List *rels = NIL;
3151 38 : List *part_rels = NIL;
3152 38 : List *relids = NIL;
3153 38 : List *relids_logged = NIL;
3154 : ListCell *lc;
3155 38 : LOCKMODE lockmode = AccessExclusiveLock;
3156 :
3157 : /*
3158 : * Quick return if we are skipping data modification changes or handling
3159 : * streamed transactions.
3160 : */
3161 76 : if (is_skipping_changes() ||
3162 38 : handle_streamed_transaction(LOGICAL_REP_MSG_TRUNCATE, s))
3163 0 : return;
3164 :
3165 38 : begin_replication_step();
3166 :
3167 38 : remote_relids = logicalrep_read_truncate(s, &cascade, &restart_seqs);
3168 :
3169 94 : foreach(lc, remote_relids)
3170 : {
3171 56 : LogicalRepRelId relid = lfirst_oid(lc);
3172 : LogicalRepRelMapEntry *rel;
3173 :
3174 56 : rel = logicalrep_rel_open(relid, lockmode);
3175 56 : if (!should_apply_changes_for_rel(rel))
3176 : {
3177 : /*
3178 : * The relation can't become interesting in the middle of the
3179 : * transaction so it's safe to unlock it.
3180 : */
3181 0 : logicalrep_rel_close(rel, lockmode);
3182 0 : continue;
3183 : }
3184 :
3185 56 : remote_rels = lappend(remote_rels, rel);
3186 56 : TargetPrivilegesCheck(rel->localrel, ACL_TRUNCATE);
3187 56 : rels = lappend(rels, rel->localrel);
3188 56 : relids = lappend_oid(relids, rel->localreloid);
3189 56 : if (RelationIsLogicallyLogged(rel->localrel))
3190 0 : relids_logged = lappend_oid(relids_logged, rel->localreloid);
3191 :
3192 : /*
3193 : * Truncate partitions if we got a message to truncate a partitioned
3194 : * table.
3195 : */
3196 56 : if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
3197 : {
3198 : ListCell *child;
3199 8 : List *children = find_all_inheritors(rel->localreloid,
3200 : lockmode,
3201 : NULL);
3202 :
3203 30 : foreach(child, children)
3204 : {
3205 22 : Oid childrelid = lfirst_oid(child);
3206 : Relation childrel;
3207 :
3208 22 : if (list_member_oid(relids, childrelid))
3209 8 : continue;
3210 :
3211 : /* find_all_inheritors already got lock */
3212 14 : childrel = table_open(childrelid, NoLock);
3213 :
3214 : /*
3215 : * Ignore temp tables of other backends. See similar code in
3216 : * ExecuteTruncate().
3217 : */
3218 14 : if (RELATION_IS_OTHER_TEMP(childrel))
3219 : {
3220 0 : table_close(childrel, lockmode);
3221 0 : continue;
3222 : }
3223 :
3224 14 : TargetPrivilegesCheck(childrel, ACL_TRUNCATE);
3225 14 : rels = lappend(rels, childrel);
3226 14 : part_rels = lappend(part_rels, childrel);
3227 14 : relids = lappend_oid(relids, childrelid);
3228 : /* Log this relation only if needed for logical decoding */
3229 14 : if (RelationIsLogicallyLogged(childrel))
3230 0 : relids_logged = lappend_oid(relids_logged, childrelid);
3231 : }
3232 : }
3233 : }
3234 :
3235 : /*
3236 : * Even if we used CASCADE on the upstream primary we explicitly default
3237 : * to replaying changes without further cascading. This might be later
3238 : * changeable with a user specified option.
3239 : *
3240 : * MySubscription->runasowner tells us whether we want to execute
3241 : * replication actions as the subscription owner; the last argument to
3242 : * TruncateGuts tells it whether we want to switch to the table owner.
3243 : * Those are exactly opposite conditions.
3244 : */
3245 38 : ExecuteTruncateGuts(rels,
3246 : relids,
3247 : relids_logged,
3248 : DROP_RESTRICT,
3249 : restart_seqs,
3250 38 : !MySubscription->runasowner);
3251 94 : foreach(lc, remote_rels)
3252 : {
3253 56 : LogicalRepRelMapEntry *rel = lfirst(lc);
3254 :
3255 56 : logicalrep_rel_close(rel, NoLock);
3256 : }
3257 52 : foreach(lc, part_rels)
3258 : {
3259 14 : Relation rel = lfirst(lc);
3260 :
3261 14 : table_close(rel, NoLock);
3262 : }
3263 :
3264 38 : end_replication_step();
3265 : }
3266 :
3267 :
3268 : /*
3269 : * Logical replication protocol message dispatcher.
3270 : */
3271 : void
3272 674826 : apply_dispatch(StringInfo s)
3273 : {
3274 674826 : LogicalRepMsgType action = pq_getmsgbyte(s);
3275 : LogicalRepMsgType saved_command;
3276 :
3277 : /*
3278 : * Set the current command being applied. Since this function can be
3279 : * called recursively when applying spooled changes, save the current
3280 : * command.
3281 : */
3282 674826 : saved_command = apply_error_callback_arg.command;
3283 674826 : apply_error_callback_arg.command = action;
3284 :
3285 674826 : switch (action)
3286 : {
3287 808 : case LOGICAL_REP_MSG_BEGIN:
3288 808 : apply_handle_begin(s);
3289 808 : break;
3290 :
3291 756 : case LOGICAL_REP_MSG_COMMIT:
3292 756 : apply_handle_commit(s);
3293 756 : break;
3294 :
3295 372544 : case LOGICAL_REP_MSG_INSERT:
3296 372544 : apply_handle_insert(s);
3297 372500 : break;
3298 :
3299 132286 : case LOGICAL_REP_MSG_UPDATE:
3300 132286 : apply_handle_update(s);
3301 132274 : break;
3302 :
3303 163840 : case LOGICAL_REP_MSG_DELETE:
3304 163840 : apply_handle_delete(s);
3305 163840 : break;
3306 :
3307 38 : case LOGICAL_REP_MSG_TRUNCATE:
3308 38 : apply_handle_truncate(s);
3309 38 : break;
3310 :
3311 828 : case LOGICAL_REP_MSG_RELATION:
3312 828 : apply_handle_relation(s);
3313 828 : break;
3314 :
3315 36 : case LOGICAL_REP_MSG_TYPE:
3316 36 : apply_handle_type(s);
3317 36 : break;
3318 :
3319 14 : case LOGICAL_REP_MSG_ORIGIN:
3320 14 : apply_handle_origin(s);
3321 14 : break;
3322 :
3323 0 : case LOGICAL_REP_MSG_MESSAGE:
3324 :
3325 : /*
3326 : * Logical replication does not use generic logical messages yet.
3327 : * Although, it could be used by other applications that use this
3328 : * output plugin.
3329 : */
3330 0 : break;
3331 :
3332 1678 : case LOGICAL_REP_MSG_STREAM_START:
3333 1678 : apply_handle_stream_start(s);
3334 1678 : break;
3335 :
3336 1676 : case LOGICAL_REP_MSG_STREAM_STOP:
3337 1676 : apply_handle_stream_stop(s);
3338 1674 : break;
3339 :
3340 76 : case LOGICAL_REP_MSG_STREAM_ABORT:
3341 76 : apply_handle_stream_abort(s);
3342 76 : break;
3343 :
3344 122 : case LOGICAL_REP_MSG_STREAM_COMMIT:
3345 122 : apply_handle_stream_commit(s);
3346 118 : break;
3347 :
3348 28 : case LOGICAL_REP_MSG_BEGIN_PREPARE:
3349 28 : apply_handle_begin_prepare(s);
3350 28 : break;
3351 :
3352 26 : case LOGICAL_REP_MSG_PREPARE:
3353 26 : apply_handle_prepare(s);
3354 26 : break;
3355 :
3356 38 : case LOGICAL_REP_MSG_COMMIT_PREPARED:
3357 38 : apply_handle_commit_prepared(s);
3358 38 : break;
3359 :
3360 10 : case LOGICAL_REP_MSG_ROLLBACK_PREPARED:
3361 10 : apply_handle_rollback_prepared(s);
3362 10 : break;
3363 :
3364 22 : case LOGICAL_REP_MSG_STREAM_PREPARE:
3365 22 : apply_handle_stream_prepare(s);
3366 22 : break;
3367 :
3368 0 : default:
3369 0 : ereport(ERROR,
3370 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
3371 : errmsg("invalid logical replication message type \"??? (%d)\"", action)));
3372 : }
3373 :
3374 : /* Reset the current command */
3375 674764 : apply_error_callback_arg.command = saved_command;
3376 674764 : }
3377 :
3378 : /*
3379 : * Figure out which write/flush positions to report to the walsender process.
3380 : *
3381 : * We can't simply report back the last LSN the walsender sent us because the
3382 : * local transaction might not yet be flushed to disk locally. Instead we
3383 : * build a list that associates local with remote LSNs for every commit. When
3384 : * reporting back the flush position to the sender we iterate that list and
3385 : * check which entries on it are already locally flushed. Those we can report
3386 : * as having been flushed.
3387 : *
3388 : * The have_pending_txes is true if there are outstanding transactions that
3389 : * need to be flushed.
3390 : */
3391 : static void
3392 79486 : get_flush_position(XLogRecPtr *write, XLogRecPtr *flush,
3393 : bool *have_pending_txes)
3394 : {
3395 : dlist_mutable_iter iter;
3396 79486 : XLogRecPtr local_flush = GetFlushRecPtr(NULL);
3397 :
3398 79486 : *write = InvalidXLogRecPtr;
3399 79486 : *flush = InvalidXLogRecPtr;
3400 :
3401 80342 : dlist_foreach_modify(iter, &lsn_mapping)
3402 : {
3403 15648 : FlushPosition *pos =
3404 15648 : dlist_container(FlushPosition, node, iter.cur);
3405 :
3406 15648 : *write = pos->remote_end;
3407 :
3408 15648 : if (pos->local_end <= local_flush)
3409 : {
3410 856 : *flush = pos->remote_end;
3411 856 : dlist_delete(iter.cur);
3412 856 : pfree(pos);
3413 : }
3414 : else
3415 : {
3416 : /*
3417 : * Don't want to uselessly iterate over the rest of the list which
3418 : * could potentially be long. Instead get the last element and
3419 : * grab the write position from there.
3420 : */
3421 14792 : pos = dlist_tail_element(FlushPosition, node,
3422 : &lsn_mapping);
3423 14792 : *write = pos->remote_end;
3424 14792 : *have_pending_txes = true;
3425 14792 : return;
3426 : }
3427 : }
3428 :
3429 64694 : *have_pending_txes = !dlist_is_empty(&lsn_mapping);
3430 : }
3431 :
3432 : /*
3433 : * Store current remote/local lsn pair in the tracking list.
3434 : */
3435 : void
3436 964 : store_flush_position(XLogRecPtr remote_lsn, XLogRecPtr local_lsn)
3437 : {
3438 : FlushPosition *flushpos;
3439 :
3440 : /*
3441 : * Skip for parallel apply workers, because the lsn_mapping is maintained
3442 : * by the leader apply worker.
3443 : */
3444 964 : if (am_parallel_apply_worker())
3445 38 : return;
3446 :
3447 : /* Need to do this in permanent context */
3448 926 : MemoryContextSwitchTo(ApplyContext);
3449 :
3450 : /* Track commit lsn */
3451 926 : flushpos = (FlushPosition *) palloc(sizeof(FlushPosition));
3452 926 : flushpos->local_end = local_lsn;
3453 926 : flushpos->remote_end = remote_lsn;
3454 :
3455 926 : dlist_push_tail(&lsn_mapping, &flushpos->node);
3456 926 : MemoryContextSwitchTo(ApplyMessageContext);
3457 : }
3458 :
3459 :
3460 : /* Update statistics of the worker. */
3461 : static void
3462 372828 : UpdateWorkerStats(XLogRecPtr last_lsn, TimestampTz send_time, bool reply)
3463 : {
3464 372828 : MyLogicalRepWorker->last_lsn = last_lsn;
3465 372828 : MyLogicalRepWorker->last_send_time = send_time;
3466 372828 : MyLogicalRepWorker->last_recv_time = GetCurrentTimestamp();
3467 372828 : if (reply)
3468 : {
3469 3688 : MyLogicalRepWorker->reply_lsn = last_lsn;
3470 3688 : MyLogicalRepWorker->reply_time = send_time;
3471 : }
3472 372828 : }
3473 :
3474 : /*
3475 : * Apply main loop.
3476 : */
3477 : static void
3478 648 : LogicalRepApplyLoop(XLogRecPtr last_received)
3479 : {
3480 648 : TimestampTz last_recv_timestamp = GetCurrentTimestamp();
3481 648 : bool ping_sent = false;
3482 : TimeLineID tli;
3483 : ErrorContextCallback errcallback;
3484 :
3485 : /*
3486 : * Init the ApplyMessageContext which we clean up after each replication
3487 : * protocol message.
3488 : */
3489 648 : ApplyMessageContext = AllocSetContextCreate(ApplyContext,
3490 : "ApplyMessageContext",
3491 : ALLOCSET_DEFAULT_SIZES);
3492 :
3493 : /*
3494 : * This memory context is used for per-stream data when the streaming mode
3495 : * is enabled. This context is reset on each stream stop.
3496 : */
3497 648 : LogicalStreamingContext = AllocSetContextCreate(ApplyContext,
3498 : "LogicalStreamingContext",
3499 : ALLOCSET_DEFAULT_SIZES);
3500 :
3501 : /* mark as idle, before starting to loop */
3502 648 : pgstat_report_activity(STATE_IDLE, NULL);
3503 :
3504 : /*
3505 : * Push apply error context callback. Fields will be filled while applying
3506 : * a change.
3507 : */
3508 648 : errcallback.callback = apply_error_callback;
3509 648 : errcallback.previous = error_context_stack;
3510 648 : error_context_stack = &errcallback;
3511 648 : apply_error_context_stack = error_context_stack;
3512 :
3513 : /* This outer loop iterates once per wait. */
3514 : for (;;)
3515 75006 : {
3516 75654 : pgsocket fd = PGINVALID_SOCKET;
3517 : int rc;
3518 : int len;
3519 75654 : char *buf = NULL;
3520 75654 : bool endofstream = false;
3521 : long wait_time;
3522 :
3523 75654 : CHECK_FOR_INTERRUPTS();
3524 :
3525 75654 : MemoryContextSwitchTo(ApplyMessageContext);
3526 :
3527 75654 : len = walrcv_receive(LogRepWorkerWalRcvConn, &buf, &fd);
3528 :
3529 75614 : if (len != 0)
3530 : {
3531 : /* Loop to process all available data (without blocking). */
3532 : for (;;)
3533 : {
3534 446828 : CHECK_FOR_INTERRUPTS();
3535 :
3536 446828 : if (len == 0)
3537 : {
3538 73988 : break;
3539 : }
3540 372840 : else if (len < 0)
3541 : {
3542 12 : ereport(LOG,
3543 : (errmsg("data stream from publisher has ended")));
3544 12 : endofstream = true;
3545 12 : break;
3546 : }
3547 : else
3548 : {
3549 : int c;
3550 : StringInfoData s;
3551 :
3552 372828 : if (ConfigReloadPending)
3553 : {
3554 0 : ConfigReloadPending = false;
3555 0 : ProcessConfigFile(PGC_SIGHUP);
3556 : }
3557 :
3558 : /* Reset timeout. */
3559 372828 : last_recv_timestamp = GetCurrentTimestamp();
3560 372828 : ping_sent = false;
3561 :
3562 : /* Ensure we are reading the data into our memory context. */
3563 372828 : MemoryContextSwitchTo(ApplyMessageContext);
3564 :
3565 372828 : initReadOnlyStringInfo(&s, buf, len);
3566 :
3567 372828 : c = pq_getmsgbyte(&s);
3568 :
3569 372828 : if (c == 'w')
3570 : {
3571 : XLogRecPtr start_lsn;
3572 : XLogRecPtr end_lsn;
3573 : TimestampTz send_time;
3574 :
3575 369140 : start_lsn = pq_getmsgint64(&s);
3576 369140 : end_lsn = pq_getmsgint64(&s);
3577 369140 : send_time = pq_getmsgint64(&s);
3578 :
3579 369140 : if (last_received < start_lsn)
3580 302916 : last_received = start_lsn;
3581 :
3582 369140 : if (last_received < end_lsn)
3583 0 : last_received = end_lsn;
3584 :
3585 369140 : UpdateWorkerStats(last_received, send_time, false);
3586 :
3587 369140 : apply_dispatch(&s);
3588 : }
3589 3688 : else if (c == 'k')
3590 : {
3591 : XLogRecPtr end_lsn;
3592 : TimestampTz timestamp;
3593 : bool reply_requested;
3594 :
3595 3688 : end_lsn = pq_getmsgint64(&s);
3596 3688 : timestamp = pq_getmsgint64(&s);
3597 3688 : reply_requested = pq_getmsgbyte(&s);
3598 :
3599 3688 : if (last_received < end_lsn)
3600 1440 : last_received = end_lsn;
3601 :
3602 3688 : send_feedback(last_received, reply_requested, false);
3603 3688 : UpdateWorkerStats(last_received, timestamp, true);
3604 : }
3605 : /* other message types are purposefully ignored */
3606 :
3607 372770 : MemoryContextReset(ApplyMessageContext);
3608 : }
3609 :
3610 372770 : len = walrcv_receive(LogRepWorkerWalRcvConn, &buf, &fd);
3611 : }
3612 : }
3613 :
3614 : /* confirm all writes so far */
3615 75556 : send_feedback(last_received, false, false);
3616 :
3617 75556 : if (!in_remote_transaction && !in_streamed_transaction)
3618 : {
3619 : /*
3620 : * If we didn't get any transactions for a while there might be
3621 : * unconsumed invalidation messages in the queue, consume them
3622 : * now.
3623 : */
3624 5616 : AcceptInvalidationMessages();
3625 5616 : maybe_reread_subscription();
3626 :
3627 : /* Process any table synchronization changes. */
3628 5554 : process_syncing_tables(last_received);
3629 : }
3630 :
3631 : /* Cleanup the memory. */
3632 75162 : MemoryContextReset(ApplyMessageContext);
3633 75162 : MemoryContextSwitchTo(TopMemoryContext);
3634 :
3635 : /* Check if we need to exit the streaming loop. */
3636 75162 : if (endofstream)
3637 12 : break;
3638 :
3639 : /*
3640 : * Wait for more data or latch. If we have unflushed transactions,
3641 : * wake up after WalWriterDelay to see if they've been flushed yet (in
3642 : * which case we should send a feedback message). Otherwise, there's
3643 : * no particular urgency about waking up unless we get data or a
3644 : * signal.
3645 : */
3646 75150 : if (!dlist_is_empty(&lsn_mapping))
3647 12966 : wait_time = WalWriterDelay;
3648 : else
3649 62184 : wait_time = NAPTIME_PER_CYCLE;
3650 :
3651 75150 : rc = WaitLatchOrSocket(MyLatch,
3652 : WL_SOCKET_READABLE | WL_LATCH_SET |
3653 : WL_TIMEOUT | WL_EXIT_ON_PM_DEATH,
3654 : fd, wait_time,
3655 : WAIT_EVENT_LOGICAL_APPLY_MAIN);
3656 :
3657 75150 : if (rc & WL_LATCH_SET)
3658 : {
3659 864 : ResetLatch(MyLatch);
3660 864 : CHECK_FOR_INTERRUPTS();
3661 : }
3662 :
3663 75006 : if (ConfigReloadPending)
3664 : {
3665 26 : ConfigReloadPending = false;
3666 26 : ProcessConfigFile(PGC_SIGHUP);
3667 : }
3668 :
3669 75006 : if (rc & WL_TIMEOUT)
3670 : {
3671 : /*
3672 : * We didn't receive anything new. If we haven't heard anything
3673 : * from the server for more than wal_receiver_timeout / 2, ping
3674 : * the server. Also, if it's been longer than
3675 : * wal_receiver_status_interval since the last update we sent,
3676 : * send a status update to the primary anyway, to report any
3677 : * progress in applying WAL.
3678 : */
3679 242 : bool requestReply = false;
3680 :
3681 : /*
3682 : * Check if time since last receive from primary has reached the
3683 : * configured limit.
3684 : */
3685 242 : if (wal_receiver_timeout > 0)
3686 : {
3687 242 : TimestampTz now = GetCurrentTimestamp();
3688 : TimestampTz timeout;
3689 :
3690 242 : timeout =
3691 242 : TimestampTzPlusMilliseconds(last_recv_timestamp,
3692 : wal_receiver_timeout);
3693 :
3694 242 : if (now >= timeout)
3695 0 : ereport(ERROR,
3696 : (errcode(ERRCODE_CONNECTION_FAILURE),
3697 : errmsg("terminating logical replication worker due to timeout")));
3698 :
3699 : /* Check to see if it's time for a ping. */
3700 242 : if (!ping_sent)
3701 : {
3702 242 : timeout = TimestampTzPlusMilliseconds(last_recv_timestamp,
3703 : (wal_receiver_timeout / 2));
3704 242 : if (now >= timeout)
3705 : {
3706 0 : requestReply = true;
3707 0 : ping_sent = true;
3708 : }
3709 : }
3710 : }
3711 :
3712 242 : send_feedback(last_received, requestReply, requestReply);
3713 :
3714 : /*
3715 : * Force reporting to ensure long idle periods don't lead to
3716 : * arbitrarily delayed stats. Stats can only be reported outside
3717 : * of (implicit or explicit) transactions. That shouldn't lead to
3718 : * stats being delayed for long, because transactions are either
3719 : * sent as a whole on commit or streamed. Streamed transactions
3720 : * are spilled to disk and applied on commit.
3721 : */
3722 242 : if (!IsTransactionState())
3723 242 : pgstat_report_stat(true);
3724 : }
3725 : }
3726 :
3727 : /* Pop the error context stack */
3728 12 : error_context_stack = errcallback.previous;
3729 12 : apply_error_context_stack = error_context_stack;
3730 :
3731 : /* All done */
3732 12 : walrcv_endstreaming(LogRepWorkerWalRcvConn, &tli);
3733 0 : }
3734 :
3735 : /*
3736 : * Send a Standby Status Update message to server.
3737 : *
3738 : * 'recvpos' is the latest LSN we've received data to, force is set if we need
3739 : * to send a response to avoid timeouts.
3740 : */
3741 : static void
3742 79486 : send_feedback(XLogRecPtr recvpos, bool force, bool requestReply)
3743 : {
3744 : static StringInfo reply_message = NULL;
3745 : static TimestampTz send_time = 0;
3746 :
3747 : static XLogRecPtr last_recvpos = InvalidXLogRecPtr;
3748 : static XLogRecPtr last_writepos = InvalidXLogRecPtr;
3749 : static XLogRecPtr last_flushpos = InvalidXLogRecPtr;
3750 :
3751 : XLogRecPtr writepos;
3752 : XLogRecPtr flushpos;
3753 : TimestampTz now;
3754 : bool have_pending_txes;
3755 :
3756 : /*
3757 : * If the user doesn't want status to be reported to the publisher, be
3758 : * sure to exit before doing anything at all.
3759 : */
3760 79486 : if (!force && wal_receiver_status_interval <= 0)
3761 25508 : return;
3762 :
3763 : /* It's legal to not pass a recvpos */
3764 79486 : if (recvpos < last_recvpos)
3765 0 : recvpos = last_recvpos;
3766 :
3767 79486 : get_flush_position(&writepos, &flushpos, &have_pending_txes);
3768 :
3769 : /*
3770 : * No outstanding transactions to flush, we can report the latest received
3771 : * position. This is important for synchronous replication.
3772 : */
3773 79486 : if (!have_pending_txes)
3774 64694 : flushpos = writepos = recvpos;
3775 :
3776 79486 : if (writepos < last_writepos)
3777 0 : writepos = last_writepos;
3778 :
3779 79486 : if (flushpos < last_flushpos)
3780 14728 : flushpos = last_flushpos;
3781 :
3782 79486 : now = GetCurrentTimestamp();
3783 :
3784 : /* if we've already reported everything we're good */
3785 79486 : if (!force &&
3786 78542 : writepos == last_writepos &&
3787 25940 : flushpos == last_flushpos &&
3788 25720 : !TimestampDifferenceExceeds(send_time, now,
3789 : wal_receiver_status_interval * 1000))
3790 25508 : return;
3791 53978 : send_time = now;
3792 :
3793 53978 : if (!reply_message)
3794 : {
3795 648 : MemoryContext oldctx = MemoryContextSwitchTo(ApplyContext);
3796 :
3797 648 : reply_message = makeStringInfo();
3798 648 : MemoryContextSwitchTo(oldctx);
3799 : }
3800 : else
3801 53330 : resetStringInfo(reply_message);
3802 :
3803 53978 : pq_sendbyte(reply_message, 'r');
3804 53978 : pq_sendint64(reply_message, recvpos); /* write */
3805 53978 : pq_sendint64(reply_message, flushpos); /* flush */
3806 53978 : pq_sendint64(reply_message, writepos); /* apply */
3807 53978 : pq_sendint64(reply_message, now); /* sendTime */
3808 53978 : pq_sendbyte(reply_message, requestReply); /* replyRequested */
3809 :
3810 53978 : elog(DEBUG2, "sending feedback (force %d) to recv %X/%X, write %X/%X, flush %X/%X",
3811 : force,
3812 : LSN_FORMAT_ARGS(recvpos),
3813 : LSN_FORMAT_ARGS(writepos),
3814 : LSN_FORMAT_ARGS(flushpos));
3815 :
3816 53978 : walrcv_send(LogRepWorkerWalRcvConn,
3817 : reply_message->data, reply_message->len);
3818 :
3819 53978 : if (recvpos > last_recvpos)
3820 52600 : last_recvpos = recvpos;
3821 53978 : if (writepos > last_writepos)
3822 52604 : last_writepos = writepos;
3823 53978 : if (flushpos > last_flushpos)
3824 52134 : last_flushpos = flushpos;
3825 : }
3826 :
3827 : /*
3828 : * Exit routine for apply workers due to subscription parameter changes.
3829 : */
3830 : static void
3831 66 : apply_worker_exit(void)
3832 : {
3833 66 : if (am_parallel_apply_worker())
3834 : {
3835 : /*
3836 : * Don't stop the parallel apply worker as the leader will detect the
3837 : * subscription parameter change and restart logical replication later
3838 : * anyway. This also prevents the leader from reporting errors when
3839 : * trying to communicate with a stopped parallel apply worker, which
3840 : * would accidentally disable subscriptions if disable_on_error was
3841 : * set.
3842 : */
3843 0 : return;
3844 : }
3845 :
3846 : /*
3847 : * Reset the last-start time for this apply worker so that the launcher
3848 : * will restart it without waiting for wal_retrieve_retry_interval if the
3849 : * subscription is still active, and so that we won't leak that hash table
3850 : * entry if it isn't.
3851 : */
3852 66 : if (am_leader_apply_worker())
3853 66 : ApplyLauncherForgetWorkerStartTime(MyLogicalRepWorker->subid);
3854 :
3855 66 : proc_exit(0);
3856 : }
3857 :
3858 : /*
3859 : * Reread subscription info if needed. Most changes will be exit.
3860 : */
3861 : void
3862 7474 : maybe_reread_subscription(void)
3863 : {
3864 : MemoryContext oldctx;
3865 : Subscription *newsub;
3866 7474 : bool started_tx = false;
3867 :
3868 : /* When cache state is valid there is nothing to do here. */
3869 7474 : if (MySubscriptionValid)
3870 7342 : return;
3871 :
3872 : /* This function might be called inside or outside of transaction. */
3873 132 : if (!IsTransactionState())
3874 : {
3875 124 : StartTransactionCommand();
3876 124 : started_tx = true;
3877 : }
3878 :
3879 : /* Ensure allocations in permanent context. */
3880 132 : oldctx = MemoryContextSwitchTo(ApplyContext);
3881 :
3882 132 : newsub = GetSubscription(MyLogicalRepWorker->subid, true);
3883 :
3884 : /*
3885 : * Exit if the subscription was removed. This normally should not happen
3886 : * as the worker gets killed during DROP SUBSCRIPTION.
3887 : */
3888 132 : if (!newsub)
3889 : {
3890 0 : ereport(LOG,
3891 : (errmsg("logical replication worker for subscription \"%s\" will stop because the subscription was removed",
3892 : MySubscription->name)));
3893 :
3894 : /* Ensure we remove no-longer-useful entry for worker's start time */
3895 0 : if (am_leader_apply_worker())
3896 0 : ApplyLauncherForgetWorkerStartTime(MyLogicalRepWorker->subid);
3897 :
3898 0 : proc_exit(0);
3899 : }
3900 :
3901 : /* Exit if the subscription was disabled. */
3902 132 : if (!newsub->enabled)
3903 : {
3904 12 : ereport(LOG,
3905 : (errmsg("logical replication worker for subscription \"%s\" will stop because the subscription was disabled",
3906 : MySubscription->name)));
3907 :
3908 12 : apply_worker_exit();
3909 : }
3910 :
3911 : /* !slotname should never happen when enabled is true. */
3912 : Assert(newsub->slotname);
3913 :
3914 : /* two-phase should not be altered */
3915 : Assert(newsub->twophasestate == MySubscription->twophasestate);
3916 :
3917 : /*
3918 : * Exit if any parameter that affects the remote connection was changed.
3919 : * The launcher will start a new worker but note that the parallel apply
3920 : * worker won't restart if the streaming option's value is changed from
3921 : * 'parallel' to any other value or the server decides not to stream the
3922 : * in-progress transaction.
3923 : */
3924 120 : if (strcmp(newsub->conninfo, MySubscription->conninfo) != 0 ||
3925 116 : strcmp(newsub->name, MySubscription->name) != 0 ||
3926 114 : strcmp(newsub->slotname, MySubscription->slotname) != 0 ||
3927 114 : newsub->binary != MySubscription->binary ||
3928 102 : newsub->stream != MySubscription->stream ||
3929 92 : newsub->passwordrequired != MySubscription->passwordrequired ||
3930 92 : strcmp(newsub->origin, MySubscription->origin) != 0 ||
3931 92 : newsub->owner != MySubscription->owner ||
3932 90 : !equal(newsub->publications, MySubscription->publications))
3933 : {
3934 46 : if (am_parallel_apply_worker())
3935 0 : ereport(LOG,
3936 : (errmsg("logical replication parallel apply worker for subscription \"%s\" will stop because of a parameter change",
3937 : MySubscription->name)));
3938 : else
3939 46 : ereport(LOG,
3940 : (errmsg("logical replication worker for subscription \"%s\" will restart because of a parameter change",
3941 : MySubscription->name)));
3942 :
3943 46 : apply_worker_exit();
3944 : }
3945 :
3946 : /*
3947 : * Exit if the subscription owner's superuser privileges have been
3948 : * revoked.
3949 : */
3950 74 : if (!newsub->ownersuperuser && MySubscription->ownersuperuser)
3951 : {
3952 8 : if (am_parallel_apply_worker())
3953 0 : ereport(LOG,
3954 : errmsg("logical replication parallel apply worker for subscription \"%s\" will stop because the subscription owner's superuser privileges have been revoked",
3955 : MySubscription->name));
3956 : else
3957 8 : ereport(LOG,
3958 : errmsg("logical replication worker for subscription \"%s\" will restart because the subscription owner's superuser privileges have been revoked",
3959 : MySubscription->name));
3960 :
3961 8 : apply_worker_exit();
3962 : }
3963 :
3964 : /* Check for other changes that should never happen too. */
3965 66 : if (newsub->dbid != MySubscription->dbid)
3966 : {
3967 0 : elog(ERROR, "subscription %u changed unexpectedly",
3968 : MyLogicalRepWorker->subid);
3969 : }
3970 :
3971 : /* Clean old subscription info and switch to new one. */
3972 66 : FreeSubscription(MySubscription);
3973 66 : MySubscription = newsub;
3974 :
3975 66 : MemoryContextSwitchTo(oldctx);
3976 :
3977 : /* Change synchronous commit according to the user's wishes */
3978 66 : SetConfigOption("synchronous_commit", MySubscription->synccommit,
3979 : PGC_BACKEND, PGC_S_OVERRIDE);
3980 :
3981 66 : if (started_tx)
3982 62 : CommitTransactionCommand();
3983 :
3984 66 : MySubscriptionValid = true;
3985 : }
3986 :
3987 : /*
3988 : * Callback from subscription syscache invalidation.
3989 : */
3990 : static void
3991 138 : subscription_change_cb(Datum arg, int cacheid, uint32 hashvalue)
3992 : {
3993 138 : MySubscriptionValid = false;
3994 138 : }
3995 :
3996 : /*
3997 : * subxact_info_write
3998 : * Store information about subxacts for a toplevel transaction.
3999 : *
4000 : * For each subxact we store offset of it's first change in the main file.
4001 : * The file is always over-written as a whole.
4002 : *
4003 : * XXX We should only store subxacts that were not aborted yet.
4004 : */
4005 : static void
4006 742 : subxact_info_write(Oid subid, TransactionId xid)
4007 : {
4008 : char path[MAXPGPATH];
4009 : Size len;
4010 : BufFile *fd;
4011 :
4012 : Assert(TransactionIdIsValid(xid));
4013 :
4014 : /* construct the subxact filename */
4015 742 : subxact_filename(path, subid, xid);
4016 :
4017 : /* Delete the subxacts file, if exists. */
4018 742 : if (subxact_data.nsubxacts == 0)
4019 : {
4020 578 : cleanup_subxact_info();
4021 578 : BufFileDeleteFileSet(MyLogicalRepWorker->stream_fileset, path, true);
4022 :
4023 578 : return;
4024 : }
4025 :
4026 : /*
4027 : * Create the subxact file if it not already created, otherwise open the
4028 : * existing file.
4029 : */
4030 164 : fd = BufFileOpenFileSet(MyLogicalRepWorker->stream_fileset, path, O_RDWR,
4031 : true);
4032 164 : if (fd == NULL)
4033 16 : fd = BufFileCreateFileSet(MyLogicalRepWorker->stream_fileset, path);
4034 :
4035 164 : len = sizeof(SubXactInfo) * subxact_data.nsubxacts;
4036 :
4037 : /* Write the subxact count and subxact info */
4038 164 : BufFileWrite(fd, &subxact_data.nsubxacts, sizeof(subxact_data.nsubxacts));
4039 164 : BufFileWrite(fd, subxact_data.subxacts, len);
4040 :
4041 164 : BufFileClose(fd);
4042 :
4043 : /* free the memory allocated for subxact info */
4044 164 : cleanup_subxact_info();
4045 : }
4046 :
4047 : /*
4048 : * subxact_info_read
4049 : * Restore information about subxacts of a streamed transaction.
4050 : *
4051 : * Read information about subxacts into the structure subxact_data that can be
4052 : * used later.
4053 : */
4054 : static void
4055 686 : subxact_info_read(Oid subid, TransactionId xid)
4056 : {
4057 : char path[MAXPGPATH];
4058 : Size len;
4059 : BufFile *fd;
4060 : MemoryContext oldctx;
4061 :
4062 : Assert(!subxact_data.subxacts);
4063 : Assert(subxact_data.nsubxacts == 0);
4064 : Assert(subxact_data.nsubxacts_max == 0);
4065 :
4066 : /*
4067 : * If the subxact file doesn't exist that means we don't have any subxact
4068 : * info.
4069 : */
4070 686 : subxact_filename(path, subid, xid);
4071 686 : fd = BufFileOpenFileSet(MyLogicalRepWorker->stream_fileset, path, O_RDONLY,
4072 : true);
4073 686 : if (fd == NULL)
4074 528 : return;
4075 :
4076 : /* read number of subxact items */
4077 158 : BufFileReadExact(fd, &subxact_data.nsubxacts, sizeof(subxact_data.nsubxacts));
4078 :
4079 158 : len = sizeof(SubXactInfo) * subxact_data.nsubxacts;
4080 :
4081 : /* we keep the maximum as a power of 2 */
4082 158 : subxact_data.nsubxacts_max = 1 << my_log2(subxact_data.nsubxacts);
4083 :
4084 : /*
4085 : * Allocate subxact information in the logical streaming context. We need
4086 : * this information during the complete stream so that we can add the sub
4087 : * transaction info to this. On stream stop we will flush this information
4088 : * to the subxact file and reset the logical streaming context.
4089 : */
4090 158 : oldctx = MemoryContextSwitchTo(LogicalStreamingContext);
4091 158 : subxact_data.subxacts = palloc(subxact_data.nsubxacts_max *
4092 : sizeof(SubXactInfo));
4093 158 : MemoryContextSwitchTo(oldctx);
4094 :
4095 158 : if (len > 0)
4096 158 : BufFileReadExact(fd, subxact_data.subxacts, len);
4097 :
4098 158 : BufFileClose(fd);
4099 : }
4100 :
4101 : /*
4102 : * subxact_info_add
4103 : * Add information about a subxact (offset in the main file).
4104 : */
4105 : static void
4106 205026 : subxact_info_add(TransactionId xid)
4107 : {
4108 205026 : SubXactInfo *subxacts = subxact_data.subxacts;
4109 : int64 i;
4110 :
4111 : /* We must have a valid top level stream xid and a stream fd. */
4112 : Assert(TransactionIdIsValid(stream_xid));
4113 : Assert(stream_fd != NULL);
4114 :
4115 : /*
4116 : * If the XID matches the toplevel transaction, we don't want to add it.
4117 : */
4118 205026 : if (stream_xid == xid)
4119 184778 : return;
4120 :
4121 : /*
4122 : * In most cases we're checking the same subxact as we've already seen in
4123 : * the last call, so make sure to ignore it (this change comes later).
4124 : */
4125 20248 : if (subxact_data.subxact_last == xid)
4126 20096 : return;
4127 :
4128 : /* OK, remember we're processing this XID. */
4129 152 : subxact_data.subxact_last = xid;
4130 :
4131 : /*
4132 : * Check if the transaction is already present in the array of subxact. We
4133 : * intentionally scan the array from the tail, because we're likely adding
4134 : * a change for the most recent subtransactions.
4135 : *
4136 : * XXX Can we rely on the subxact XIDs arriving in sorted order? That
4137 : * would allow us to use binary search here.
4138 : */
4139 190 : for (i = subxact_data.nsubxacts; i > 0; i--)
4140 : {
4141 : /* found, so we're done */
4142 152 : if (subxacts[i - 1].xid == xid)
4143 114 : return;
4144 : }
4145 :
4146 : /* This is a new subxact, so we need to add it to the array. */
4147 38 : if (subxact_data.nsubxacts == 0)
4148 : {
4149 : MemoryContext oldctx;
4150 :
4151 16 : subxact_data.nsubxacts_max = 128;
4152 :
4153 : /*
4154 : * Allocate this memory for subxacts in per-stream context, see
4155 : * subxact_info_read.
4156 : */
4157 16 : oldctx = MemoryContextSwitchTo(LogicalStreamingContext);
4158 16 : subxacts = palloc(subxact_data.nsubxacts_max * sizeof(SubXactInfo));
4159 16 : MemoryContextSwitchTo(oldctx);
4160 : }
4161 22 : else if (subxact_data.nsubxacts == subxact_data.nsubxacts_max)
4162 : {
4163 20 : subxact_data.nsubxacts_max *= 2;
4164 20 : subxacts = repalloc(subxacts,
4165 20 : subxact_data.nsubxacts_max * sizeof(SubXactInfo));
4166 : }
4167 :
4168 38 : subxacts[subxact_data.nsubxacts].xid = xid;
4169 :
4170 : /*
4171 : * Get the current offset of the stream file and store it as offset of
4172 : * this subxact.
4173 : */
4174 38 : BufFileTell(stream_fd,
4175 38 : &subxacts[subxact_data.nsubxacts].fileno,
4176 38 : &subxacts[subxact_data.nsubxacts].offset);
4177 :
4178 38 : subxact_data.nsubxacts++;
4179 38 : subxact_data.subxacts = subxacts;
4180 : }
4181 :
4182 : /* format filename for file containing the info about subxacts */
4183 : static inline void
4184 1490 : subxact_filename(char *path, Oid subid, TransactionId xid)
4185 : {
4186 1490 : snprintf(path, MAXPGPATH, "%u-%u.subxacts", subid, xid);
4187 1490 : }
4188 :
4189 : /* format filename for file containing serialized changes */
4190 : static inline void
4191 874 : changes_filename(char *path, Oid subid, TransactionId xid)
4192 : {
4193 874 : snprintf(path, MAXPGPATH, "%u-%u.changes", subid, xid);
4194 874 : }
4195 :
4196 : /*
4197 : * stream_cleanup_files
4198 : * Cleanup files for a subscription / toplevel transaction.
4199 : *
4200 : * Remove files with serialized changes and subxact info for a particular
4201 : * toplevel transaction. Each subscription has a separate set of files
4202 : * for any toplevel transaction.
4203 : */
4204 : void
4205 62 : stream_cleanup_files(Oid subid, TransactionId xid)
4206 : {
4207 : char path[MAXPGPATH];
4208 :
4209 : /* Delete the changes file. */
4210 62 : changes_filename(path, subid, xid);
4211 62 : BufFileDeleteFileSet(MyLogicalRepWorker->stream_fileset, path, false);
4212 :
4213 : /* Delete the subxact file, if it exists. */
4214 62 : subxact_filename(path, subid, xid);
4215 62 : BufFileDeleteFileSet(MyLogicalRepWorker->stream_fileset, path, true);
4216 62 : }
4217 :
4218 : /*
4219 : * stream_open_file
4220 : * Open a file that we'll use to serialize changes for a toplevel
4221 : * transaction.
4222 : *
4223 : * Open a file for streamed changes from a toplevel transaction identified
4224 : * by stream_xid (global variable). If it's the first chunk of streamed
4225 : * changes for this transaction, create the buffile, otherwise open the
4226 : * previously created file.
4227 : */
4228 : static void
4229 724 : stream_open_file(Oid subid, TransactionId xid, bool first_segment)
4230 : {
4231 : char path[MAXPGPATH];
4232 : MemoryContext oldcxt;
4233 :
4234 : Assert(OidIsValid(subid));
4235 : Assert(TransactionIdIsValid(xid));
4236 : Assert(stream_fd == NULL);
4237 :
4238 :
4239 724 : changes_filename(path, subid, xid);
4240 724 : elog(DEBUG1, "opening file \"%s\" for streamed changes", path);
4241 :
4242 : /*
4243 : * Create/open the buffiles under the logical streaming context so that we
4244 : * have those files until stream stop.
4245 : */
4246 724 : oldcxt = MemoryContextSwitchTo(LogicalStreamingContext);
4247 :
4248 : /*
4249 : * If this is the first streamed segment, create the changes file.
4250 : * Otherwise, just open the file for writing, in append mode.
4251 : */
4252 724 : if (first_segment)
4253 64 : stream_fd = BufFileCreateFileSet(MyLogicalRepWorker->stream_fileset,
4254 : path);
4255 : else
4256 : {
4257 : /*
4258 : * Open the file and seek to the end of the file because we always
4259 : * append the changes file.
4260 : */
4261 660 : stream_fd = BufFileOpenFileSet(MyLogicalRepWorker->stream_fileset,
4262 : path, O_RDWR, false);
4263 660 : BufFileSeek(stream_fd, 0, 0, SEEK_END);
4264 : }
4265 :
4266 724 : MemoryContextSwitchTo(oldcxt);
4267 724 : }
4268 :
4269 : /*
4270 : * stream_close_file
4271 : * Close the currently open file with streamed changes.
4272 : */
4273 : static void
4274 784 : stream_close_file(void)
4275 : {
4276 : Assert(stream_fd != NULL);
4277 :
4278 784 : BufFileClose(stream_fd);
4279 :
4280 784 : stream_fd = NULL;
4281 784 : }
4282 :
4283 : /*
4284 : * stream_write_change
4285 : * Serialize a change to a file for the current toplevel transaction.
4286 : *
4287 : * The change is serialized in a simple format, with length (not including
4288 : * the length), action code (identifying the message type) and message
4289 : * contents (without the subxact TransactionId value).
4290 : */
4291 : static void
4292 215108 : stream_write_change(char action, StringInfo s)
4293 : {
4294 : int len;
4295 :
4296 : Assert(stream_fd != NULL);
4297 :
4298 : /* total on-disk size, including the action type character */
4299 215108 : len = (s->len - s->cursor) + sizeof(char);
4300 :
4301 : /* first write the size */
4302 215108 : BufFileWrite(stream_fd, &len, sizeof(len));
4303 :
4304 : /* then the action */
4305 215108 : BufFileWrite(stream_fd, &action, sizeof(action));
4306 :
4307 : /* and finally the remaining part of the buffer (after the XID) */
4308 215108 : len = (s->len - s->cursor);
4309 :
4310 215108 : BufFileWrite(stream_fd, &s->data[s->cursor], len);
4311 215108 : }
4312 :
4313 : /*
4314 : * stream_open_and_write_change
4315 : * Serialize a message to a file for the given transaction.
4316 : *
4317 : * This function is similar to stream_write_change except that it will open the
4318 : * target file if not already before writing the message and close the file at
4319 : * the end.
4320 : */
4321 : static void
4322 10 : stream_open_and_write_change(TransactionId xid, char action, StringInfo s)
4323 : {
4324 : Assert(!in_streamed_transaction);
4325 :
4326 10 : if (!stream_fd)
4327 10 : stream_start_internal(xid, false);
4328 :
4329 10 : stream_write_change(action, s);
4330 10 : stream_stop_internal(xid);
4331 10 : }
4332 :
4333 : /*
4334 : * Sets streaming options including replication slot name and origin start
4335 : * position. Workers need these options for logical replication.
4336 : */
4337 : void
4338 648 : set_stream_options(WalRcvStreamOptions *options,
4339 : char *slotname,
4340 : XLogRecPtr *origin_startpos)
4341 : {
4342 : int server_version;
4343 :
4344 648 : options->logical = true;
4345 648 : options->startpoint = *origin_startpos;
4346 648 : options->slotname = slotname;
4347 :
4348 648 : server_version = walrcv_server_version(LogRepWorkerWalRcvConn);
4349 648 : options->proto.logical.proto_version =
4350 648 : server_version >= 160000 ? LOGICALREP_PROTO_STREAM_PARALLEL_VERSION_NUM :
4351 : server_version >= 150000 ? LOGICALREP_PROTO_TWOPHASE_VERSION_NUM :
4352 : server_version >= 140000 ? LOGICALREP_PROTO_STREAM_VERSION_NUM :
4353 : LOGICALREP_PROTO_VERSION_NUM;
4354 :
4355 648 : options->proto.logical.publication_names = MySubscription->publications;
4356 648 : options->proto.logical.binary = MySubscription->binary;
4357 :
4358 : /*
4359 : * Assign the appropriate option value for streaming option according to
4360 : * the 'streaming' mode and the publisher's ability to support that mode.
4361 : */
4362 648 : if (server_version >= 160000 &&
4363 648 : MySubscription->stream == LOGICALREP_STREAM_PARALLEL)
4364 : {
4365 14 : options->proto.logical.streaming_str = "parallel";
4366 14 : MyLogicalRepWorker->parallel_apply = true;
4367 : }
4368 634 : else if (server_version >= 140000 &&
4369 634 : MySubscription->stream != LOGICALREP_STREAM_OFF)
4370 : {
4371 52 : options->proto.logical.streaming_str = "on";
4372 52 : MyLogicalRepWorker->parallel_apply = false;
4373 : }
4374 : else
4375 : {
4376 582 : options->proto.logical.streaming_str = NULL;
4377 582 : MyLogicalRepWorker->parallel_apply = false;
4378 : }
4379 :
4380 648 : options->proto.logical.twophase = false;
4381 648 : options->proto.logical.origin = pstrdup(MySubscription->origin);
4382 648 : }
4383 :
4384 : /*
4385 : * Cleanup the memory for subxacts and reset the related variables.
4386 : */
4387 : static inline void
4388 750 : cleanup_subxact_info()
4389 : {
4390 750 : if (subxact_data.subxacts)
4391 174 : pfree(subxact_data.subxacts);
4392 :
4393 750 : subxact_data.subxacts = NULL;
4394 750 : subxact_data.subxact_last = InvalidTransactionId;
4395 750 : subxact_data.nsubxacts = 0;
4396 750 : subxact_data.nsubxacts_max = 0;
4397 750 : }
4398 :
4399 : /*
4400 : * Form the prepared transaction GID for two_phase transactions.
4401 : *
4402 : * Return the GID in the supplied buffer.
4403 : */
4404 : static void
4405 90 : TwoPhaseTransactionGid(Oid subid, TransactionId xid, char *gid, int szgid)
4406 : {
4407 : Assert(subid != InvalidRepOriginId);
4408 :
4409 90 : if (!TransactionIdIsValid(xid))
4410 0 : ereport(ERROR,
4411 : (errcode(ERRCODE_PROTOCOL_VIOLATION),
4412 : errmsg_internal("invalid two-phase transaction ID")));
4413 :
4414 90 : snprintf(gid, szgid, "pg_gid_%u_%u", subid, xid);
4415 90 : }
4416 :
4417 : /*
4418 : * Common function to run the apply loop with error handling. Disable the
4419 : * subscription, if necessary.
4420 : *
4421 : * Note that we don't handle FATAL errors which are probably because
4422 : * of system resource error and are not repeatable.
4423 : */
4424 : void
4425 648 : start_apply(XLogRecPtr origin_startpos)
4426 : {
4427 648 : PG_TRY();
4428 : {
4429 648 : LogicalRepApplyLoop(origin_startpos);
4430 : }
4431 106 : PG_CATCH();
4432 : {
4433 106 : if (MySubscription->disableonerr)
4434 6 : DisableSubscriptionAndExit();
4435 : else
4436 : {
4437 : /*
4438 : * Report the worker failed while applying changes. Abort the
4439 : * current transaction so that the stats message is sent in an
4440 : * idle state.
4441 : */
4442 100 : AbortOutOfAnyTransaction();
4443 100 : pgstat_report_subscription_error(MySubscription->oid, !am_tablesync_worker());
4444 :
4445 100 : PG_RE_THROW();
4446 : }
4447 : }
4448 0 : PG_END_TRY();
4449 0 : }
4450 :
4451 : /*
4452 : * Runs the leader apply worker.
4453 : *
4454 : * It sets up replication origin, streaming options and then starts streaming.
4455 : */
4456 : static void
4457 374 : run_apply_worker()
4458 : {
4459 : char originname[NAMEDATALEN];
4460 374 : XLogRecPtr origin_startpos = InvalidXLogRecPtr;
4461 374 : char *slotname = NULL;
4462 : WalRcvStreamOptions options;
4463 : RepOriginId originid;
4464 : TimeLineID startpointTLI;
4465 : char *err;
4466 : bool must_use_password;
4467 :
4468 374 : slotname = MySubscription->slotname;
4469 :
4470 : /*
4471 : * This shouldn't happen if the subscription is enabled, but guard against
4472 : * DDL bugs or manual catalog changes. (libpqwalreceiver will crash if
4473 : * slot is NULL.)
4474 : */
4475 374 : if (!slotname)
4476 0 : ereport(ERROR,
4477 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
4478 : errmsg("subscription has no replication slot set")));
4479 :
4480 : /* Setup replication origin tracking. */
4481 374 : ReplicationOriginNameForLogicalRep(MySubscription->oid, InvalidOid,
4482 : originname, sizeof(originname));
4483 374 : StartTransactionCommand();
4484 374 : originid = replorigin_by_name(originname, true);
4485 374 : if (!OidIsValid(originid))
4486 0 : originid = replorigin_create(originname);
4487 374 : replorigin_session_setup(originid, 0);
4488 374 : replorigin_session_origin = originid;
4489 374 : origin_startpos = replorigin_session_get_progress(false);
4490 374 : CommitTransactionCommand();
4491 :
4492 : /* Is the use of a password mandatory? */
4493 712 : must_use_password = MySubscription->passwordrequired &&
4494 338 : !MySubscription->ownersuperuser;
4495 :
4496 374 : LogRepWorkerWalRcvConn = walrcv_connect(MySubscription->conninfo, true,
4497 : true, must_use_password,
4498 : MySubscription->name, &err);
4499 :
4500 364 : if (LogRepWorkerWalRcvConn == NULL)
4501 36 : ereport(ERROR,
4502 : (errcode(ERRCODE_CONNECTION_FAILURE),
4503 : errmsg("could not connect to the publisher: %s", err)));
4504 :
4505 : /*
4506 : * We don't really use the output identify_system for anything but it does
4507 : * some initializations on the upstream so let's still call it.
4508 : */
4509 328 : (void) walrcv_identify_system(LogRepWorkerWalRcvConn, &startpointTLI);
4510 :
4511 328 : set_apply_error_context_origin(originname);
4512 :
4513 328 : set_stream_options(&options, slotname, &origin_startpos);
4514 :
4515 : /*
4516 : * Even when the two_phase mode is requested by the user, it remains as
4517 : * the tri-state PENDING until all tablesyncs have reached READY state.
4518 : * Only then, can it become ENABLED.
4519 : *
4520 : * Note: If the subscription has no tables then leave the state as
4521 : * PENDING, which allows ALTER SUBSCRIPTION ... REFRESH PUBLICATION to
4522 : * work.
4523 : */
4524 350 : if (MySubscription->twophasestate == LOGICALREP_TWOPHASE_STATE_PENDING &&
4525 22 : AllTablesyncsReady())
4526 : {
4527 : /* Start streaming with two_phase enabled */
4528 8 : options.proto.logical.twophase = true;
4529 8 : walrcv_startstreaming(LogRepWorkerWalRcvConn, &options);
4530 :
4531 8 : StartTransactionCommand();
4532 8 : UpdateTwoPhaseState(MySubscription->oid, LOGICALREP_TWOPHASE_STATE_ENABLED);
4533 8 : MySubscription->twophasestate = LOGICALREP_TWOPHASE_STATE_ENABLED;
4534 8 : CommitTransactionCommand();
4535 : }
4536 : else
4537 : {
4538 320 : walrcv_startstreaming(LogRepWorkerWalRcvConn, &options);
4539 : }
4540 :
4541 328 : ereport(DEBUG1,
4542 : (errmsg_internal("logical replication apply worker for subscription \"%s\" two_phase is %s",
4543 : MySubscription->name,
4544 : MySubscription->twophasestate == LOGICALREP_TWOPHASE_STATE_DISABLED ? "DISABLED" :
4545 : MySubscription->twophasestate == LOGICALREP_TWOPHASE_STATE_PENDING ? "PENDING" :
4546 : MySubscription->twophasestate == LOGICALREP_TWOPHASE_STATE_ENABLED ? "ENABLED" :
4547 : "?")));
4548 :
4549 : /* Run the main loop. */
4550 328 : start_apply(origin_startpos);
4551 0 : }
4552 :
4553 : /*
4554 : * Common initialization for leader apply worker, parallel apply worker and
4555 : * tablesync worker.
4556 : *
4557 : * Initialize the database connection, in-memory subscription and necessary
4558 : * config options.
4559 : */
4560 : void
4561 742 : InitializeLogRepWorker(void)
4562 : {
4563 : MemoryContext oldctx;
4564 :
4565 : /* Run as replica session replication role. */
4566 742 : SetConfigOption("session_replication_role", "replica",
4567 : PGC_SUSET, PGC_S_OVERRIDE);
4568 :
4569 : /* Connect to our database. */
4570 742 : BackgroundWorkerInitializeConnectionByOid(MyLogicalRepWorker->dbid,
4571 742 : MyLogicalRepWorker->userid,
4572 : 0);
4573 :
4574 : /*
4575 : * Set always-secure search path, so malicious users can't redirect user
4576 : * code (e.g. pg_index.indexprs).
4577 : */
4578 734 : SetConfigOption("search_path", "", PGC_SUSET, PGC_S_OVERRIDE);
4579 :
4580 : /* Load the subscription into persistent memory context. */
4581 734 : ApplyContext = AllocSetContextCreate(TopMemoryContext,
4582 : "ApplyContext",
4583 : ALLOCSET_DEFAULT_SIZES);
4584 734 : StartTransactionCommand();
4585 734 : oldctx = MemoryContextSwitchTo(ApplyContext);
4586 :
4587 734 : MySubscription = GetSubscription(MyLogicalRepWorker->subid, true);
4588 734 : if (!MySubscription)
4589 : {
4590 0 : ereport(LOG,
4591 : (errmsg("logical replication worker for subscription %u will not start because the subscription was removed during startup",
4592 : MyLogicalRepWorker->subid)));
4593 :
4594 : /* Ensure we remove no-longer-useful entry for worker's start time */
4595 0 : if (am_leader_apply_worker())
4596 0 : ApplyLauncherForgetWorkerStartTime(MyLogicalRepWorker->subid);
4597 :
4598 0 : proc_exit(0);
4599 : }
4600 :
4601 734 : MySubscriptionValid = true;
4602 734 : MemoryContextSwitchTo(oldctx);
4603 :
4604 734 : if (!MySubscription->enabled)
4605 : {
4606 0 : ereport(LOG,
4607 : (errmsg("logical replication worker for subscription \"%s\" will not start because the subscription was disabled during startup",
4608 : MySubscription->name)));
4609 :
4610 0 : apply_worker_exit();
4611 : }
4612 :
4613 : /* Setup synchronous commit according to the user's wishes */
4614 734 : SetConfigOption("synchronous_commit", MySubscription->synccommit,
4615 : PGC_BACKEND, PGC_S_OVERRIDE);
4616 :
4617 : /*
4618 : * Keep us informed about subscription or role changes. Note that the
4619 : * role's superuser privilege can be revoked.
4620 : */
4621 734 : CacheRegisterSyscacheCallback(SUBSCRIPTIONOID,
4622 : subscription_change_cb,
4623 : (Datum) 0);
4624 :
4625 734 : CacheRegisterSyscacheCallback(AUTHOID,
4626 : subscription_change_cb,
4627 : (Datum) 0);
4628 :
4629 734 : if (am_tablesync_worker())
4630 340 : ereport(LOG,
4631 : (errmsg("logical replication table synchronization worker for subscription \"%s\", table \"%s\" has started",
4632 : MySubscription->name,
4633 : get_rel_name(MyLogicalRepWorker->relid))));
4634 : else
4635 394 : ereport(LOG,
4636 : (errmsg("logical replication apply worker for subscription \"%s\" has started",
4637 : MySubscription->name)));
4638 :
4639 734 : CommitTransactionCommand();
4640 734 : }
4641 :
4642 : /* Common function to setup the leader apply or tablesync worker. */
4643 : void
4644 722 : SetupApplyOrSyncWorker(int worker_slot)
4645 : {
4646 : /* Attach to slot */
4647 722 : logicalrep_worker_attach(worker_slot);
4648 :
4649 : Assert(am_tablesync_worker() || am_leader_apply_worker());
4650 :
4651 : /* Setup signal handling */
4652 722 : pqsignal(SIGHUP, SignalHandlerForConfigReload);
4653 722 : pqsignal(SIGTERM, die);
4654 722 : BackgroundWorkerUnblockSignals();
4655 :
4656 : /*
4657 : * We don't currently need any ResourceOwner in a walreceiver process, but
4658 : * if we did, we could call CreateAuxProcessResourceOwner here.
4659 : */
4660 :
4661 : /* Initialise stats to a sanish value */
4662 722 : MyLogicalRepWorker->last_send_time = MyLogicalRepWorker->last_recv_time =
4663 722 : MyLogicalRepWorker->reply_time = GetCurrentTimestamp();
4664 :
4665 : /* Load the libpq-specific functions */
4666 722 : load_file("libpqwalreceiver", false);
4667 :
4668 722 : InitializeLogRepWorker();
4669 :
4670 : /* Connect to the origin and start the replication. */
4671 714 : elog(DEBUG1, "connecting to publisher using connection string \"%s\"",
4672 : MySubscription->conninfo);
4673 :
4674 : /*
4675 : * Setup callback for syscache so that we know when something changes in
4676 : * the subscription relation state.
4677 : */
4678 714 : CacheRegisterSyscacheCallback(SUBSCRIPTIONRELMAP,
4679 : invalidate_syncing_table_states,
4680 : (Datum) 0);
4681 714 : }
4682 :
4683 : /* Logical Replication Apply worker entry point */
4684 : void
4685 382 : ApplyWorkerMain(Datum main_arg)
4686 : {
4687 382 : int worker_slot = DatumGetInt32(main_arg);
4688 :
4689 382 : InitializingApplyWorker = true;
4690 :
4691 382 : SetupApplyOrSyncWorker(worker_slot);
4692 :
4693 374 : InitializingApplyWorker = false;
4694 :
4695 374 : run_apply_worker();
4696 :
4697 0 : proc_exit(0);
4698 : }
4699 :
4700 : /*
4701 : * After error recovery, disable the subscription in a new transaction
4702 : * and exit cleanly.
4703 : */
4704 : void
4705 8 : DisableSubscriptionAndExit(void)
4706 : {
4707 : /*
4708 : * Emit the error message, and recover from the error state to an idle
4709 : * state
4710 : */
4711 8 : HOLD_INTERRUPTS();
4712 :
4713 8 : EmitErrorReport();
4714 8 : AbortOutOfAnyTransaction();
4715 8 : FlushErrorState();
4716 :
4717 8 : RESUME_INTERRUPTS();
4718 :
4719 : /* Report the worker failed during either table synchronization or apply */
4720 8 : pgstat_report_subscription_error(MyLogicalRepWorker->subid,
4721 8 : !am_tablesync_worker());
4722 :
4723 : /* Disable the subscription */
4724 8 : StartTransactionCommand();
4725 8 : DisableSubscription(MySubscription->oid);
4726 8 : CommitTransactionCommand();
4727 :
4728 : /* Ensure we remove no-longer-useful entry for worker's start time */
4729 8 : if (am_leader_apply_worker())
4730 6 : ApplyLauncherForgetWorkerStartTime(MyLogicalRepWorker->subid);
4731 :
4732 : /* Notify the subscription has been disabled and exit */
4733 8 : ereport(LOG,
4734 : errmsg("subscription \"%s\" has been disabled because of an error",
4735 : MySubscription->name));
4736 :
4737 8 : proc_exit(0);
4738 : }
4739 :
4740 : /*
4741 : * Is current process a logical replication worker?
4742 : */
4743 : bool
4744 3542 : IsLogicalWorker(void)
4745 : {
4746 3542 : return MyLogicalRepWorker != NULL;
4747 : }
4748 :
4749 : /*
4750 : * Is current process a logical replication parallel apply worker?
4751 : */
4752 : bool
4753 2662 : IsLogicalParallelApplyWorker(void)
4754 : {
4755 2662 : return IsLogicalWorker() && am_parallel_apply_worker();
4756 : }
4757 :
4758 : /*
4759 : * Start skipping changes of the transaction if the given LSN matches the
4760 : * LSN specified by subscription's skiplsn.
4761 : */
4762 : static void
4763 890 : maybe_start_skipping_changes(XLogRecPtr finish_lsn)
4764 : {
4765 : Assert(!is_skipping_changes());
4766 : Assert(!in_remote_transaction);
4767 : Assert(!in_streamed_transaction);
4768 :
4769 : /*
4770 : * Quick return if it's not requested to skip this transaction. This
4771 : * function is called for every remote transaction and we assume that
4772 : * skipping the transaction is not used often.
4773 : */
4774 890 : if (likely(XLogRecPtrIsInvalid(MySubscription->skiplsn) ||
4775 : MySubscription->skiplsn != finish_lsn))
4776 884 : return;
4777 :
4778 : /* Start skipping all changes of this transaction */
4779 6 : skip_xact_finish_lsn = finish_lsn;
4780 :
4781 6 : ereport(LOG,
4782 : errmsg("logical replication starts skipping transaction at LSN %X/%X",
4783 : LSN_FORMAT_ARGS(skip_xact_finish_lsn)));
4784 : }
4785 :
4786 : /*
4787 : * Stop skipping changes by resetting skip_xact_finish_lsn if enabled.
4788 : */
4789 : static void
4790 52 : stop_skipping_changes(void)
4791 : {
4792 52 : if (!is_skipping_changes())
4793 46 : return;
4794 :
4795 6 : ereport(LOG,
4796 : (errmsg("logical replication completed skipping transaction at LSN %X/%X",
4797 : LSN_FORMAT_ARGS(skip_xact_finish_lsn))));
4798 :
4799 : /* Stop skipping changes */
4800 6 : skip_xact_finish_lsn = InvalidXLogRecPtr;
4801 : }
4802 :
4803 : /*
4804 : * Clear subskiplsn of pg_subscription catalog.
4805 : *
4806 : * finish_lsn is the transaction's finish LSN that is used to check if the
4807 : * subskiplsn matches it. If not matched, we raise a warning when clearing the
4808 : * subskiplsn in order to inform users for cases e.g., where the user mistakenly
4809 : * specified the wrong subskiplsn.
4810 : */
4811 : static void
4812 932 : clear_subscription_skip_lsn(XLogRecPtr finish_lsn)
4813 : {
4814 : Relation rel;
4815 : Form_pg_subscription subform;
4816 : HeapTuple tup;
4817 932 : XLogRecPtr myskiplsn = MySubscription->skiplsn;
4818 932 : bool started_tx = false;
4819 :
4820 932 : if (likely(XLogRecPtrIsInvalid(myskiplsn)) || am_parallel_apply_worker())
4821 926 : return;
4822 :
4823 6 : if (!IsTransactionState())
4824 : {
4825 2 : StartTransactionCommand();
4826 2 : started_tx = true;
4827 : }
4828 :
4829 : /*
4830 : * Protect subskiplsn of pg_subscription from being concurrently updated
4831 : * while clearing it.
4832 : */
4833 6 : LockSharedObject(SubscriptionRelationId, MySubscription->oid, 0,
4834 : AccessShareLock);
4835 :
4836 6 : rel = table_open(SubscriptionRelationId, RowExclusiveLock);
4837 :
4838 : /* Fetch the existing tuple. */
4839 6 : tup = SearchSysCacheCopy1(SUBSCRIPTIONOID,
4840 : ObjectIdGetDatum(MySubscription->oid));
4841 :
4842 6 : if (!HeapTupleIsValid(tup))
4843 0 : elog(ERROR, "subscription \"%s\" does not exist", MySubscription->name);
4844 :
4845 6 : subform = (Form_pg_subscription) GETSTRUCT(tup);
4846 :
4847 : /*
4848 : * Clear the subskiplsn. If the user has already changed subskiplsn before
4849 : * clearing it we don't update the catalog and the replication origin
4850 : * state won't get advanced. So in the worst case, if the server crashes
4851 : * before sending an acknowledgment of the flush position the transaction
4852 : * will be sent again and the user needs to set subskiplsn again. We can
4853 : * reduce the possibility by logging a replication origin WAL record to
4854 : * advance the origin LSN instead but there is no way to advance the
4855 : * origin timestamp and it doesn't seem to be worth doing anything about
4856 : * it since it's a very rare case.
4857 : */
4858 6 : if (subform->subskiplsn == myskiplsn)
4859 : {
4860 : bool nulls[Natts_pg_subscription];
4861 : bool replaces[Natts_pg_subscription];
4862 : Datum values[Natts_pg_subscription];
4863 :
4864 6 : memset(values, 0, sizeof(values));
4865 6 : memset(nulls, false, sizeof(nulls));
4866 6 : memset(replaces, false, sizeof(replaces));
4867 :
4868 : /* reset subskiplsn */
4869 6 : values[Anum_pg_subscription_subskiplsn - 1] = LSNGetDatum(InvalidXLogRecPtr);
4870 6 : replaces[Anum_pg_subscription_subskiplsn - 1] = true;
4871 :
4872 6 : tup = heap_modify_tuple(tup, RelationGetDescr(rel), values, nulls,
4873 : replaces);
4874 6 : CatalogTupleUpdate(rel, &tup->t_self, tup);
4875 :
4876 6 : if (myskiplsn != finish_lsn)
4877 0 : ereport(WARNING,
4878 : errmsg("skip-LSN of subscription \"%s\" cleared", MySubscription->name),
4879 : errdetail("Remote transaction's finish WAL location (LSN) %X/%X did not match skip-LSN %X/%X.",
4880 : LSN_FORMAT_ARGS(finish_lsn),
4881 : LSN_FORMAT_ARGS(myskiplsn)));
4882 : }
4883 :
4884 6 : heap_freetuple(tup);
4885 6 : table_close(rel, NoLock);
4886 :
4887 6 : if (started_tx)
4888 2 : CommitTransactionCommand();
4889 : }
4890 :
4891 : /* Error callback to give more context info about the change being applied */
4892 : void
4893 1286 : apply_error_callback(void *arg)
4894 : {
4895 1286 : ApplyErrorCallbackArg *errarg = &apply_error_callback_arg;
4896 :
4897 1286 : if (apply_error_callback_arg.command == 0)
4898 608 : return;
4899 :
4900 : Assert(errarg->origin_name);
4901 :
4902 678 : if (errarg->rel == NULL)
4903 : {
4904 624 : if (!TransactionIdIsValid(errarg->remote_xid))
4905 0 : errcontext("processing remote data for replication origin \"%s\" during message type \"%s\"",
4906 : errarg->origin_name,
4907 : logicalrep_message_type(errarg->command));
4908 624 : else if (XLogRecPtrIsInvalid(errarg->finish_lsn))
4909 516 : errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" in transaction %u",
4910 : errarg->origin_name,
4911 : logicalrep_message_type(errarg->command),
4912 : errarg->remote_xid);
4913 : else
4914 216 : errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" in transaction %u, finished at %X/%X",
4915 : errarg->origin_name,
4916 : logicalrep_message_type(errarg->command),
4917 : errarg->remote_xid,
4918 108 : LSN_FORMAT_ARGS(errarg->finish_lsn));
4919 : }
4920 : else
4921 : {
4922 54 : if (errarg->remote_attnum < 0)
4923 : {
4924 54 : if (XLogRecPtrIsInvalid(errarg->finish_lsn))
4925 0 : errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" in transaction %u",
4926 : errarg->origin_name,
4927 : logicalrep_message_type(errarg->command),
4928 0 : errarg->rel->remoterel.nspname,
4929 0 : errarg->rel->remoterel.relname,
4930 : errarg->remote_xid);
4931 : else
4932 108 : errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" in transaction %u, finished at %X/%X",
4933 : errarg->origin_name,
4934 : logicalrep_message_type(errarg->command),
4935 54 : errarg->rel->remoterel.nspname,
4936 54 : errarg->rel->remoterel.relname,
4937 : errarg->remote_xid,
4938 54 : LSN_FORMAT_ARGS(errarg->finish_lsn));
4939 : }
4940 : else
4941 : {
4942 0 : if (XLogRecPtrIsInvalid(errarg->finish_lsn))
4943 0 : errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" column \"%s\" in transaction %u",
4944 : errarg->origin_name,
4945 : logicalrep_message_type(errarg->command),
4946 0 : errarg->rel->remoterel.nspname,
4947 0 : errarg->rel->remoterel.relname,
4948 0 : errarg->rel->remoterel.attnames[errarg->remote_attnum],
4949 : errarg->remote_xid);
4950 : else
4951 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/%X",
4952 : errarg->origin_name,
4953 : logicalrep_message_type(errarg->command),
4954 0 : errarg->rel->remoterel.nspname,
4955 0 : errarg->rel->remoterel.relname,
4956 0 : errarg->rel->remoterel.attnames[errarg->remote_attnum],
4957 : errarg->remote_xid,
4958 0 : LSN_FORMAT_ARGS(errarg->finish_lsn));
4959 : }
4960 : }
4961 : }
4962 :
4963 : /* Set transaction information of apply error callback */
4964 : static inline void
4965 5502 : set_apply_error_context_xact(TransactionId xid, XLogRecPtr lsn)
4966 : {
4967 5502 : apply_error_callback_arg.remote_xid = xid;
4968 5502 : apply_error_callback_arg.finish_lsn = lsn;
4969 5502 : }
4970 :
4971 : /* Reset all information of apply error callback */
4972 : static inline void
4973 2720 : reset_apply_error_context_info(void)
4974 : {
4975 2720 : apply_error_callback_arg.command = 0;
4976 2720 : apply_error_callback_arg.rel = NULL;
4977 2720 : apply_error_callback_arg.remote_attnum = -1;
4978 2720 : set_apply_error_context_xact(InvalidTransactionId, InvalidXLogRecPtr);
4979 2720 : }
4980 :
4981 : /*
4982 : * Request wakeup of the workers for the given subscription OID
4983 : * at commit of the current transaction.
4984 : *
4985 : * This is used to ensure that the workers process assorted changes
4986 : * as soon as possible.
4987 : */
4988 : void
4989 356 : LogicalRepWorkersWakeupAtCommit(Oid subid)
4990 : {
4991 : MemoryContext oldcxt;
4992 :
4993 356 : oldcxt = MemoryContextSwitchTo(TopTransactionContext);
4994 356 : on_commit_wakeup_workers_subids =
4995 356 : list_append_unique_oid(on_commit_wakeup_workers_subids, subid);
4996 356 : MemoryContextSwitchTo(oldcxt);
4997 356 : }
4998 :
4999 : /*
5000 : * Wake up the workers of any subscriptions that were changed in this xact.
5001 : */
5002 : void
5003 565694 : AtEOXact_LogicalRepWorkers(bool isCommit)
5004 : {
5005 565694 : if (isCommit && on_commit_wakeup_workers_subids != NIL)
5006 : {
5007 : ListCell *lc;
5008 :
5009 348 : LWLockAcquire(LogicalRepWorkerLock, LW_SHARED);
5010 696 : foreach(lc, on_commit_wakeup_workers_subids)
5011 : {
5012 348 : Oid subid = lfirst_oid(lc);
5013 : List *workers;
5014 : ListCell *lc2;
5015 :
5016 348 : workers = logicalrep_workers_find(subid, true);
5017 444 : foreach(lc2, workers)
5018 : {
5019 96 : LogicalRepWorker *worker = (LogicalRepWorker *) lfirst(lc2);
5020 :
5021 96 : logicalrep_worker_wakeup_ptr(worker);
5022 : }
5023 : }
5024 348 : LWLockRelease(LogicalRepWorkerLock);
5025 : }
5026 :
5027 : /* The List storage will be reclaimed automatically in xact cleanup. */
5028 565694 : on_commit_wakeup_workers_subids = NIL;
5029 565694 : }
5030 :
5031 : /*
5032 : * Allocate the origin name in long-lived context for error context message.
5033 : */
5034 : void
5035 668 : set_apply_error_context_origin(char *originname)
5036 : {
5037 668 : apply_error_callback_arg.origin_name = MemoryContextStrdup(ApplyContext,
5038 : originname);
5039 668 : }
5040 :
5041 : /*
5042 : * Return the action to be taken for the given transaction. See
5043 : * TransApplyAction for information on each of the actions.
5044 : *
5045 : * *winfo is assigned to the destination parallel worker info when the leader
5046 : * apply worker has to pass all the transaction's changes to the parallel
5047 : * apply worker.
5048 : */
5049 : static TransApplyAction
5050 653142 : get_transaction_apply_action(TransactionId xid, ParallelApplyWorkerInfo **winfo)
5051 : {
5052 653142 : *winfo = NULL;
5053 :
5054 653142 : if (am_parallel_apply_worker())
5055 : {
5056 138818 : return TRANS_PARALLEL_APPLY;
5057 : }
5058 :
5059 : /*
5060 : * If we are processing this transaction using a parallel apply worker
5061 : * then either we send the changes to the parallel worker or if the worker
5062 : * is busy then serialize the changes to the file which will later be
5063 : * processed by the parallel worker.
5064 : */
5065 514324 : *winfo = pa_find_worker(xid);
5066 :
5067 514324 : if (*winfo && (*winfo)->serialize_changes)
5068 : {
5069 10074 : return TRANS_LEADER_PARTIAL_SERIALIZE;
5070 : }
5071 504250 : else if (*winfo)
5072 : {
5073 137792 : return TRANS_LEADER_SEND_TO_PARALLEL;
5074 : }
5075 :
5076 : /*
5077 : * If there is no parallel worker involved to process this transaction
5078 : * then we either directly apply the change or serialize it to a file
5079 : * which will later be applied when the transaction finish message is
5080 : * processed.
5081 : */
5082 366458 : else if (in_streamed_transaction)
5083 : {
5084 206394 : return TRANS_LEADER_SERIALIZE;
5085 : }
5086 : else
5087 : {
5088 160064 : return TRANS_LEADER_APPLY;
5089 : }
5090 : }
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