Line data Source code
1 : /*-------------------------------------------------------------------------
2 : * logicalctl.c
3 : * Functionality to control logical decoding status online.
4 : *
5 : * This module enables dynamic control of logical decoding availability.
6 : * Logical decoding becomes active under two conditions: when the wal_level
7 : * parameter is set to 'logical', or when at least one valid logical replication
8 : * slot exists with wal_level set to 'replica'. The system disables logical
9 : * decoding when neither condition is met. Therefore, the dynamic control
10 : * of logical decoding availability is required only when wal_level is set
11 : * to 'replica'. Logical decoding is always enabled when wal_level='logical'
12 : * and always disabled when wal_level='minimal'.
13 : *
14 : * The core concept of dynamically enabling and disabling logical decoding
15 : * is to separately control two aspects: writing information required for
16 : * logical decoding to WAL records, and using logical decoding itself. During
17 : * activation, we first enable logical WAL writing while keeping logical
18 : * decoding disabled. This change is reflected in the read-only
19 : * effective_wal_level GUC parameter. Once we ensure that all processes have
20 : * updated to the latest effective_wal_level value, we then enable logical
21 : * decoding. Deactivation follows a similar careful, multi-step process
22 : * in reverse order.
23 : *
24 : * While activation occurs synchronously right after creating the first
25 : * logical slot, deactivation happens asynchronously through the checkpointer
26 : * process. This design avoids a race condition at the end of recovery; see
27 : * the comments in UpdateLogicalDecodingStatusEndOfRecovery() for details.
28 : * Asynchronous deactivation also avoids excessive toggling of the logical
29 : * decoding status in workloads that repeatedly create and drop a single
30 : * logical slot. On the other hand, this lazy approach can delay changes
31 : * to effective_wal_level and the disabling logical decoding, especially
32 : * when the checkpointer is busy with other tasks. We chose this lazy approach
33 : * in all deactivation paths to keep the implementation simple, even though
34 : * laziness is strictly required only for end-of-recovery cases. Future work
35 : * might address this limitation either by using a dedicated worker instead
36 : * of the checkpointer, or by implementing synchronous waiting during slot
37 : * drops if workloads are significantly affected by the lazy deactivation
38 : * of logical decoding.
39 : *
40 : * Standby servers use the primary server's effective_wal_level and logical
41 : * decoding status. Unlike normal activation and deactivation, these
42 : * are updated simultaneously without status change coordination, solely by
43 : * replaying XLOG_LOGICAL_DECODING_STATUS_CHANGE records. The local wal_level
44 : * setting has no effect during this time. Upon promotion, we update the
45 : * logical decoding status based on local conditions: the wal_level value and
46 : * the presence of logical slots.
47 : *
48 : * In the future, we could extend support to include automatic transitions
49 : * of effective_wal_level between 'minimal' and 'logical' WAL levels. However,
50 : * this enhancement would require additional coordination mechanisms and
51 : * careful implementation of operations such as terminating walsenders and
52 : * archiver processes while carefully considering the sequence of operations
53 : * to ensure system stability during these transitions.
54 : *
55 : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
56 : * Portions Copyright (c) 1994, Regents of the University of California
57 : *
58 : * IDENTIFICATION
59 : * src/backend/replication/logical/logicalctl.c
60 : *
61 : *-------------------------------------------------------------------------
62 : */
63 :
64 : #include "postgres.h"
65 :
66 : #include "access/xloginsert.h"
67 : #include "catalog/pg_control.h"
68 : #include "miscadmin.h"
69 : #include "replication/slot.h"
70 : #include "storage/ipc.h"
71 : #include "storage/lmgr.h"
72 : #include "storage/proc.h"
73 : #include "storage/procarray.h"
74 : #include "storage/procsignal.h"
75 : #include "storage/subsystems.h"
76 : #include "utils/injection_point.h"
77 :
78 : /*
79 : * Struct for controlling the logical decoding status.
80 : *
81 : * This struct is protected by LogicalDecodingControlLock.
82 : */
83 : typedef struct LogicalDecodingCtlData
84 : {
85 : /*
86 : * This is the authoritative value used by all processes to determine
87 : * whether to write additional information required by logical decoding to
88 : * WAL. Since this information could be checked frequently, each process
89 : * caches this value in XLogLogicalInfo for better performance.
90 : */
91 : bool xlog_logical_info;
92 :
93 : /* True if logical decoding is available in the system */
94 : bool logical_decoding_enabled;
95 :
96 : /* True if logical decoding might need to be disabled */
97 : bool pending_disable;
98 : } LogicalDecodingCtlData;
99 :
100 : static LogicalDecodingCtlData *LogicalDecodingCtl = NULL;
101 :
102 : static void LogicalDecodingCtlShmemRequest(void *arg);
103 :
104 : const ShmemCallbacks LogicalDecodingCtlShmemCallbacks = {
105 : .request_fn = LogicalDecodingCtlShmemRequest,
106 : };
107 :
108 : /*
109 : * A process-local cache of LogicalDecodingCtl->xlog_logical_info. This is
110 : * initialized at process startup, and updated when processing the process
111 : * barrier signal in ProcessBarrierUpdateXLogLogicalInfo(). If the process
112 : * is in an XID-assigned transaction, the cache update is delayed until the
113 : * transaction ends. See the comments for XLogLogicalInfoUpdatePending for details.
114 : */
115 : bool XLogLogicalInfo = false;
116 :
117 : /*
118 : * When receiving the PROCSIGNAL_BARRIER_UPDATE_XLOG_LOGICAL_INFO signal, if
119 : * an XID is assigned to the current transaction, the process sets this flag and
120 : * delays the XLogLogicalInfo update until the transaction ends. This ensures
121 : * that the XLogLogicalInfo value (typically accessed via XLogLogicalInfoActive)
122 : * remains consistent throughout the transaction.
123 : */
124 : static bool XLogLogicalInfoUpdatePending = false;
125 :
126 : static void update_xlog_logical_info(void);
127 : static void abort_logical_decoding_activation(int code, Datum arg);
128 : static void write_logical_decoding_status_update_record(bool status);
129 :
130 : static void
131 1232 : LogicalDecodingCtlShmemRequest(void *arg)
132 : {
133 1232 : ShmemRequestStruct(.name = "Logical decoding control",
134 : .size = sizeof(LogicalDecodingCtlData),
135 : .ptr = (void **) &LogicalDecodingCtl,
136 : );
137 1232 : }
138 :
139 : /*
140 : * Initialize the logical decoding status in shmem at server startup. This
141 : * must be called ONCE during postmaster or standalone-backend startup.
142 : */
143 : void
144 1068 : StartupLogicalDecodingStatus(bool last_status)
145 : {
146 : /* Logical decoding is always disabled when 'minimal' WAL level */
147 1068 : if (wal_level == WAL_LEVEL_MINIMAL)
148 396 : return;
149 :
150 : /*
151 : * Set the initial logical decoding status based on the last status. If
152 : * logical decoding was enabled before the last shutdown, it remains
153 : * enabled as we might have set wal_level='logical' or have at least one
154 : * logical slot.
155 : */
156 672 : LogicalDecodingCtl->xlog_logical_info = last_status;
157 672 : LogicalDecodingCtl->logical_decoding_enabled = last_status;
158 : }
159 :
160 : /*
161 : * Update the XLogLogicalInfo cache.
162 : */
163 : static inline void
164 26678 : update_xlog_logical_info(void)
165 : {
166 26678 : XLogLogicalInfo = IsXLogLogicalInfoEnabled();
167 26678 : }
168 :
169 : /*
170 : * Initialize XLogLogicalInfo backend-private cache. This routine is called
171 : * during process initialization.
172 : */
173 : void
174 24774 : InitializeProcessXLogLogicalInfo(void)
175 : {
176 24774 : update_xlog_logical_info();
177 24774 : }
178 :
179 : /*
180 : * This routine is called when we are told to update XLogLogicalInfo
181 : * by a ProcSignalBarrier.
182 : */
183 : bool
184 1904 : ProcessBarrierUpdateXLogLogicalInfo(void)
185 : {
186 1904 : if (GetTopTransactionIdIfAny() != InvalidTransactionId)
187 : {
188 : /* Delay updating XLogLogicalInfo until the transaction end */
189 0 : XLogLogicalInfoUpdatePending = true;
190 : }
191 : else
192 1904 : update_xlog_logical_info();
193 :
194 1904 : return true;
195 : }
196 :
197 : /*
198 : * Check the shared memory state and return true if logical decoding is
199 : * enabled on the system.
200 : */
201 : bool
202 19756 : IsLogicalDecodingEnabled(void)
203 : {
204 : bool enabled;
205 :
206 19756 : LWLockAcquire(LogicalDecodingControlLock, LW_SHARED);
207 19756 : enabled = LogicalDecodingCtl->logical_decoding_enabled;
208 19756 : LWLockRelease(LogicalDecodingControlLock);
209 :
210 19756 : return enabled;
211 : }
212 :
213 : /*
214 : * Returns true if logical WAL logging is enabled based on the shared memory
215 : * status.
216 : */
217 : bool
218 26705 : IsXLogLogicalInfoEnabled(void)
219 : {
220 : bool xlog_logical_info;
221 :
222 26705 : LWLockAcquire(LogicalDecodingControlLock, LW_SHARED);
223 26705 : xlog_logical_info = LogicalDecodingCtl->xlog_logical_info;
224 26705 : LWLockRelease(LogicalDecodingControlLock);
225 :
226 26705 : return xlog_logical_info;
227 : }
228 :
229 : /*
230 : * Reset the local cache at end of the transaction.
231 : */
232 : void
233 635886 : AtEOXact_LogicalCtl(void)
234 : {
235 : /* Update the local cache if there is a pending update */
236 635886 : if (XLogLogicalInfoUpdatePending)
237 : {
238 0 : update_xlog_logical_info();
239 0 : XLogLogicalInfoUpdatePending = false;
240 : }
241 635886 : }
242 :
243 : /*
244 : * Writes an XLOG_LOGICAL_DECODING_STATUS_CHANGE WAL record with the given
245 : * status.
246 : */
247 : static void
248 84 : write_logical_decoding_status_update_record(bool status)
249 : {
250 : XLogRecPtr recptr;
251 :
252 84 : XLogBeginInsert();
253 84 : XLogRegisterData(&status, sizeof(bool));
254 84 : recptr = XLogInsert(RM_XLOG_ID, XLOG_LOGICAL_DECODING_STATUS_CHANGE);
255 84 : XLogFlush(recptr);
256 84 : }
257 :
258 : /*
259 : * A PG_ENSURE_ERROR_CLEANUP callback for activating logical decoding, resetting
260 : * the shared flags to revert the logical decoding activation process.
261 : */
262 : static void
263 1 : abort_logical_decoding_activation(int code, Datum arg)
264 : {
265 : Assert(MyReplicationSlot);
266 : Assert(!LogicalDecodingCtl->logical_decoding_enabled);
267 :
268 1 : elog(DEBUG1, "aborting logical decoding activation process");
269 :
270 : /*
271 : * Abort the change to xlog_logical_info. We don't need to check
272 : * CheckLogicalSlotExists() as we're still holding a logical slot.
273 : */
274 1 : LWLockAcquire(LogicalDecodingControlLock, LW_EXCLUSIVE);
275 1 : LogicalDecodingCtl->xlog_logical_info = false;
276 1 : LWLockRelease(LogicalDecodingControlLock);
277 :
278 : /*
279 : * Some processes might have already started logical info WAL logging, so
280 : * tell all running processes to update their caches. We don't need to
281 : * wait for all processes to disable xlog_logical_info locally as it's
282 : * always safe to write logical information to WAL records, even when not
283 : * strictly required.
284 : */
285 1 : EmitProcSignalBarrier(PROCSIGNAL_BARRIER_UPDATE_XLOG_LOGICAL_INFO);
286 1 : }
287 :
288 : /*
289 : * Enable logical decoding if disabled.
290 : *
291 : * If this function is called during recovery, it simply returns without
292 : * action since the logical decoding status change is not allowed during
293 : * this time. The logical decoding status depends on the status on the primary.
294 : * The caller should use CheckLogicalDecodingRequirements() before calling this
295 : * function to make sure that the logical decoding status can be modified.
296 : *
297 : * Note that there is no interlock between logical decoding activation
298 : * and slot creation. To ensure enabling logical decoding, the caller
299 : * needs to call this function after creating a logical slot before
300 : * initializing the logical decoding context.
301 : */
302 : void
303 500 : EnsureLogicalDecodingEnabled(void)
304 : {
305 : Assert(MyReplicationSlot);
306 : Assert(wal_level >= WAL_LEVEL_REPLICA);
307 :
308 : /* Logical decoding is always enabled */
309 500 : if (wal_level >= WAL_LEVEL_LOGICAL)
310 490 : return;
311 :
312 10 : if (RecoveryInProgress())
313 : {
314 : /*
315 : * CheckLogicalDecodingRequirements() must have already errored out if
316 : * logical decoding is not enabled since we cannot enable the logical
317 : * decoding status during recovery.
318 : */
319 : Assert(IsLogicalDecodingEnabled());
320 3 : return;
321 : }
322 :
323 : /*
324 : * Ensure to abort the activation process in cases where there in an
325 : * interruption during the wait.
326 : */
327 7 : PG_ENSURE_ERROR_CLEANUP(abort_logical_decoding_activation, (Datum) 0);
328 : {
329 7 : EnableLogicalDecoding();
330 : }
331 7 : PG_END_ENSURE_ERROR_CLEANUP(abort_logical_decoding_activation, (Datum) 0);
332 : }
333 :
334 : /*
335 : * A workhorse function to enable logical decoding.
336 : */
337 : void
338 16 : EnableLogicalDecoding(void)
339 : {
340 : bool in_recovery;
341 :
342 16 : LWLockAcquire(LogicalDecodingControlLock, LW_EXCLUSIVE);
343 :
344 : /* Return if it is already enabled */
345 16 : if (LogicalDecodingCtl->logical_decoding_enabled)
346 : {
347 2 : LogicalDecodingCtl->pending_disable = false;
348 2 : LWLockRelease(LogicalDecodingControlLock);
349 2 : return;
350 : }
351 :
352 : /*
353 : * Set logical info WAL logging in shmem. All process starts after this
354 : * point will include the information required by logical decoding to WAL
355 : * records.
356 : */
357 14 : LogicalDecodingCtl->xlog_logical_info = true;
358 :
359 14 : LWLockRelease(LogicalDecodingControlLock);
360 :
361 : /*
362 : * Tell all running processes to reflect the xlog_logical_info update, and
363 : * wait. This ensures that all running processes have enabled logical
364 : * information WAL logging.
365 : */
366 14 : WaitForProcSignalBarrier(
367 : EmitProcSignalBarrier(PROCSIGNAL_BARRIER_UPDATE_XLOG_LOGICAL_INFO));
368 :
369 14 : INJECTION_POINT("logical-decoding-activation", NULL);
370 :
371 13 : in_recovery = RecoveryInProgress();
372 :
373 : /*
374 : * There could be some transactions that might have started with the old
375 : * status, but we don't need to wait for these transactions to complete as
376 : * long as they have valid XIDs. These transactions will appear in the
377 : * xl_running_xacts record and therefore the snapshot builder will not try
378 : * to decode the transaction during the logical decoding initialization.
379 : *
380 : * There is a theoretical case where a transaction decides whether to
381 : * include logical-info to WAL records before getting an XID. In this
382 : * case, the transaction won't appear in xl_running_xacts.
383 : *
384 : * For operations that do not require an XID assignment, the process
385 : * starts including logical-info immediately upon receiving the signal
386 : * (barrier). If such an operation checks the effective_wal_level multiple
387 : * times within a single execution, the resulting WAL records might be
388 : * inconsistent (i.e., logical-info is included in some records but not in
389 : * others). However, this is harmless because logical decoding generally
390 : * ignores WAL records that are not associated with an assigned XID.
391 : *
392 : * One might think we need to wait for all running transactions, including
393 : * those without XIDs and read-only transactions, to finish before
394 : * enabling logical decoding. However, such a requirement would force the
395 : * slot creation to wait for a potentially very long time due to
396 : * long-running read queries, which is practically unacceptable.
397 : */
398 :
399 13 : START_CRIT_SECTION();
400 :
401 : /*
402 : * We enable logical decoding first, followed by writing the WAL record.
403 : * This sequence ensures logical decoding becomes available on the primary
404 : * first.
405 : */
406 13 : LWLockAcquire(LogicalDecodingControlLock, LW_EXCLUSIVE);
407 :
408 13 : LogicalDecodingCtl->logical_decoding_enabled = true;
409 :
410 13 : if (!in_recovery)
411 4 : write_logical_decoding_status_update_record(true);
412 :
413 13 : LogicalDecodingCtl->pending_disable = false;
414 :
415 13 : LWLockRelease(LogicalDecodingControlLock);
416 :
417 13 : END_CRIT_SECTION();
418 :
419 13 : if (!in_recovery)
420 4 : ereport(LOG,
421 : errmsg("logical decoding is enabled upon creating a new logical replication slot"));
422 : }
423 :
424 : /*
425 : * Initiate a request for disabling logical decoding.
426 : *
427 : * Note that this function does not verify whether logical slots exist. The
428 : * checkpointer will verify if logical decoding should actually be disabled.
429 : */
430 : void
431 432 : RequestDisableLogicalDecoding(void)
432 : {
433 432 : if (wal_level != WAL_LEVEL_REPLICA)
434 421 : return;
435 :
436 : /*
437 : * It's possible that we might not actually need to disable logical
438 : * decoding if someone creates a new logical slot concurrently. We set the
439 : * flag anyway and the checkpointer will check it and disable logical
440 : * decoding if necessary.
441 : */
442 11 : LWLockAcquire(LogicalDecodingControlLock, LW_EXCLUSIVE);
443 11 : LogicalDecodingCtl->pending_disable = true;
444 11 : LWLockRelease(LogicalDecodingControlLock);
445 :
446 11 : WakeupCheckpointer();
447 :
448 11 : elog(DEBUG1, "requested disabling logical decoding");
449 : }
450 :
451 : /*
452 : * Disable logical decoding if necessary.
453 : *
454 : * This function disables logical decoding upon a request initiated by
455 : * RequestDisableLogicalDecoding(). Otherwise, it performs no action.
456 : */
457 : void
458 5516 : DisableLogicalDecodingIfNecessary(void)
459 : {
460 : bool pending_disable;
461 :
462 5516 : if (wal_level != WAL_LEVEL_REPLICA)
463 1251 : return;
464 :
465 : /*
466 : * Sanity check as we cannot disable logical decoding while holding a
467 : * logical slot.
468 : */
469 : Assert(!MyReplicationSlot);
470 :
471 4265 : if (RecoveryInProgress())
472 1696 : return;
473 :
474 2569 : LWLockAcquire(LogicalDecodingControlLock, LW_SHARED);
475 2569 : pending_disable = LogicalDecodingCtl->pending_disable;
476 2569 : LWLockRelease(LogicalDecodingControlLock);
477 :
478 : /* Quick return if no pending disable request */
479 2569 : if (!pending_disable)
480 2559 : return;
481 :
482 10 : DisableLogicalDecoding();
483 : }
484 :
485 : /*
486 : * A workhorse function to disable logical decoding.
487 : */
488 : void
489 19 : DisableLogicalDecoding(void)
490 : {
491 19 : bool in_recovery = RecoveryInProgress();
492 :
493 19 : LWLockAcquire(LogicalDecodingControlLock, LW_EXCLUSIVE);
494 :
495 : /*
496 : * Check if we can disable logical decoding.
497 : *
498 : * Skip CheckLogicalSlotExists() check during recovery because the
499 : * existing slots will be invalidated after disabling logical decoding.
500 : */
501 19 : if (!LogicalDecodingCtl->logical_decoding_enabled ||
502 16 : (!in_recovery && CheckLogicalSlotExists()))
503 : {
504 4 : LogicalDecodingCtl->pending_disable = false;
505 4 : LWLockRelease(LogicalDecodingControlLock);
506 4 : return;
507 : }
508 :
509 15 : START_CRIT_SECTION();
510 :
511 : /*
512 : * We need to disable logical decoding first and then disable logical
513 : * information WAL logging in order to ensure that no logical decoding
514 : * processes WAL records with insufficient information.
515 : */
516 15 : LogicalDecodingCtl->logical_decoding_enabled = false;
517 :
518 : /* Write the WAL to disable logical decoding on standbys too */
519 15 : if (!in_recovery)
520 6 : write_logical_decoding_status_update_record(false);
521 :
522 : /* Now disable logical information WAL logging */
523 15 : LogicalDecodingCtl->xlog_logical_info = false;
524 15 : LogicalDecodingCtl->pending_disable = false;
525 :
526 15 : END_CRIT_SECTION();
527 :
528 15 : if (!in_recovery)
529 6 : ereport(LOG,
530 : errmsg("logical decoding is disabled because there are no valid logical replication slots"));
531 :
532 15 : LWLockRelease(LogicalDecodingControlLock);
533 :
534 : /*
535 : * Tell all running processes to reflect the xlog_logical_info update.
536 : * Unlike when enabling logical decoding, we don't need to wait for all
537 : * processes to complete it in this case. We already disabled logical
538 : * decoding and it's always safe to write logical information to WAL
539 : * records, even when not strictly required. Therefore, we don't need to
540 : * wait for all running transactions to finish either.
541 : */
542 15 : EmitProcSignalBarrier(PROCSIGNAL_BARRIER_UPDATE_XLOG_LOGICAL_INFO);
543 : }
544 :
545 : /*
546 : * Updates the logical decoding status at end of recovery, and ensures that
547 : * all running processes have the updated XLogLogicalInfo status. This
548 : * function must be called before accepting writes.
549 : */
550 : void
551 1005 : UpdateLogicalDecodingStatusEndOfRecovery(void)
552 : {
553 1005 : bool new_status = false;
554 :
555 : Assert(RecoveryInProgress());
556 :
557 : /*
558 : * With 'minimal' WAL level, there are no logical replication slots during
559 : * recovery. Logical decoding is always disabled, so there is no need to
560 : * synchronize XLogLogicalInfo.
561 : */
562 1005 : if (wal_level == WAL_LEVEL_MINIMAL)
563 : {
564 : Assert(!IsXLogLogicalInfoEnabled() && !IsLogicalDecodingEnabled());
565 396 : return;
566 : }
567 :
568 609 : LWLockAcquire(LogicalDecodingControlLock, LW_EXCLUSIVE);
569 :
570 609 : if (wal_level == WAL_LEVEL_LOGICAL || CheckLogicalSlotExists())
571 134 : new_status = true;
572 :
573 : /*
574 : * When recovery ends, we need to either enable or disable logical
575 : * decoding based on the wal_level setting and the presence of logical
576 : * slots. We need to note that concurrent slot creation and deletion could
577 : * happen but WAL writes are still not permitted until recovery fully
578 : * completes. Here's how we handle concurrent toggling of logical
579 : * decoding:
580 : *
581 : * For 'enable' case, if there's a concurrent disable request before
582 : * recovery fully completes, the checkpointer will handle it after
583 : * recovery is done. This means there might be a brief period after
584 : * recovery where logical decoding remains enabled even with no logical
585 : * replication slots present. This temporary state is not new - it can
586 : * already occur due to the checkpointer's asynchronous deactivation
587 : * process.
588 : *
589 : * For 'disable' case, backend cannot create logical replication slots
590 : * during recovery (see checks in CheckLogicalDecodingRequirements()),
591 : * which prevents a race condition between disabling logical decoding and
592 : * concurrent slot creation.
593 : */
594 609 : if (new_status != LogicalDecodingCtl->logical_decoding_enabled)
595 : {
596 : /*
597 : * Update both the logical decoding status and logical WAL logging
598 : * status. Unlike toggling these status during non-recovery, we don't
599 : * need to worry about the operation order as WAL writes are still not
600 : * permitted.
601 : */
602 74 : LogicalDecodingCtl->xlog_logical_info = new_status;
603 74 : LogicalDecodingCtl->logical_decoding_enabled = new_status;
604 :
605 74 : elog(DEBUG1,
606 : "update logical decoding status to %d at the end of recovery",
607 : new_status);
608 :
609 : /*
610 : * Now that we updated the logical decoding status, clear the pending
611 : * disable flag. It's possible that a concurrent process drops the
612 : * last logical slot and initiates the pending disable again. The
613 : * checkpointer process will check it.
614 : */
615 74 : LogicalDecodingCtl->pending_disable = false;
616 :
617 74 : LWLockRelease(LogicalDecodingControlLock);
618 :
619 74 : write_logical_decoding_status_update_record(new_status);
620 : }
621 : else
622 535 : LWLockRelease(LogicalDecodingControlLock);
623 :
624 : /*
625 : * Ensure all running processes have the updated status. We don't need to
626 : * wait for running transactions to finish as we don't accept any writes
627 : * yet. On the other hand, we need to wait for synchronizing
628 : * XLogLogicalInfo even if we've not updated the status above as the
629 : * status have been turned on and off during recovery, having running
630 : * processes have different status on their local caches.
631 : */
632 609 : if (IsUnderPostmaster)
633 476 : WaitForProcSignalBarrier(
634 : EmitProcSignalBarrier(PROCSIGNAL_BARRIER_UPDATE_XLOG_LOGICAL_INFO));
635 :
636 609 : INJECTION_POINT("startup-logical-decoding-status-change-end-of-recovery", NULL);
637 : }
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