Age Owner Branch data TLA Line data Source code
1 : : /*-------------------------------------------------------------------------
2 : : *
3 : : * repack_worker.c
4 : : * Implementation of the background worker for ad-hoc logical decoding
5 : : * during REPACK (CONCURRENTLY).
6 : : *
7 : : *
8 : : * Copyright (c) 2026, PostgreSQL Global Development Group
9 : : *
10 : : *
11 : : * IDENTIFICATION
12 : : * src/backend/commands/repack_worker.c
13 : : *
14 : : *-------------------------------------------------------------------------
15 : : */
16 : : #include "postgres.h"
17 : :
18 : : #include "access/table.h"
19 : : #include "access/xlog_internal.h"
20 : : #include "access/xlogutils.h"
21 : : #include "access/xlogwait.h"
22 : : #include "commands/repack.h"
23 : : #include "commands/repack_internal.h"
24 : : #include "libpq/libpq.h"
25 : : #include "libpq/pqmq.h"
26 : : #include "replication/snapbuild.h"
27 : : #include "storage/ipc.h"
28 : : #include "storage/proc.h"
29 : : #include "tcop/tcopprot.h"
30 : : #include "utils/guc.h"
31 : : #include "utils/memutils.h"
32 : :
33 : : #define PGREPACK_PLUGIN "pgrepack"
34 : :
35 : : static void RepackWorkerShutdown(int code, Datum arg);
36 : : static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
37 : : static void repack_cleanup_logical_decoding(LogicalDecodingContext *ctx);
38 : : static void export_initial_snapshot(Snapshot snapshot,
39 : : DecodingWorkerShared *shared);
40 : : static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
41 : : DecodingWorkerShared *shared);
42 : :
43 : : /* Is this process a REPACK worker? */
44 : : static bool am_repack_worker = false;
45 : :
46 : : /* The WAL segment being decoded. */
47 : : static XLogSegNo repack_current_segment = 0;
48 : :
49 : : /*
50 : : * Keep track of the table we're processing, to skip logical decoding of data
51 : : * from other relations.
52 : : */
53 : : static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
54 : : static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
55 : :
56 : :
57 : : /* REPACK decoding worker entry point */
58 : : void
167 alvherre@kurilemu.de 59 :CBC 9 : RepackWorkerMain(Datum main_arg)
60 : : {
61 : : dsm_segment *seg;
62 : : DecodingWorkerShared *shared;
63 : : shm_mq *mq;
64 : : shm_mq_handle *mqh;
65 : : LogicalDecodingContext *decoding_ctx;
66 : : SharedFileSet *sfs;
67 : : Snapshot snapshot;
68 : : char buf[32];
69 : :
70 : 9 : am_repack_worker = true;
71 : :
72 : 9 : BackgroundWorkerUnblockSignals();
73 : :
74 : 9 : seg = dsm_attach(DatumGetUInt32(main_arg));
75 [ - + ]: 9 : if (seg == NULL)
167 alvherre@kurilemu.de 76 [ # # ]:UBC 0 : ereport(ERROR,
77 : : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
78 : : errmsg("could not map dynamic shared memory segment"));
79 : :
167 alvherre@kurilemu.de 80 :CBC 9 : shared = (DecodingWorkerShared *) dsm_segment_address(seg);
81 : :
82 : : /* Arrange to signal the steering process if we exit. */
3 83 : 9 : before_shmem_exit(RepackWorkerShutdown, PointerGetDatum(seg));
84 : :
85 : : /*
86 : : * Join locking group - see the comments around the call of
87 : : * start_repack_decoding_worker().
88 : : */
89 [ - + ]: 9 : if (!BecomeLockGroupMember(GetPGProcByNumber(shared->backend_proc_number),
90 : : shared->backend_pid))
167 alvherre@kurilemu.de 91 :UBC 0 : return; /* The leader is not running anymore. */
92 : :
93 : : /*
94 : : * Setup a queue to send error messages to the backend that launched this
95 : : * worker.
96 : : */
167 alvherre@kurilemu.de 97 :CBC 9 : mq = (shm_mq *) (char *) BUFFERALIGN(shared->error_queue);
98 : 9 : shm_mq_set_sender(mq, MyProc);
99 : 9 : mqh = shm_mq_attach(mq, seg, NULL);
100 : 9 : pq_redirect_to_shm_mq(seg, mqh);
101 : 9 : pq_set_parallel_leader(shared->backend_pid,
102 : : shared->backend_proc_number);
103 : :
104 : : /*
105 : : * Connect to the database, skipping the connection authorization checks
106 : : * as parallel workers do. Note that we run as the owner of the table
107 : : * being repacked, who need not be able to log in or connect; the leader
108 : : * checked the invoking user's privileges before starting us.
109 : : */
153 110 : 9 : BackgroundWorkerInitializeConnectionByOid(shared->dbid, shared->roleid,
111 : : BGWORKER_BYPASS_ALLOWCONN |
112 : : BGWORKER_BYPASS_ROLELOGINCHECK);
113 : :
114 : : /* Adopt the steering backend's relevant timeouts. */
3 115 : 9 : snprintf(buf, sizeof(buf), "%d", shared->lock_timeout);
116 : 9 : SetConfigOption("lock_timeout", buf, PGC_SUSET, PGC_S_OVERRIDE);
117 : 9 : snprintf(buf, sizeof(buf), "%d", shared->transaction_timeout);
118 : 9 : SetConfigOption("transaction_timeout", buf, PGC_SUSET, PGC_S_OVERRIDE);
119 : :
120 : : /*
121 : : * Transaction is needed to open relation, and it also provides us with a
122 : : * resource owner.
123 : : */
167 124 : 9 : StartTransactionCommand();
125 : :
126 : 9 : shared = (DecodingWorkerShared *) dsm_segment_address(seg);
127 : :
128 : : /*
129 : : * Not sure the spinlock is needed here - the backend should not change
130 : : * anything in the shared memory until we have serialized the snapshot.
131 : : */
132 : 9 : SpinLockAcquire(&shared->mutex);
133 [ - + ]: 9 : Assert(!XLogRecPtrIsValid(shared->lsn_upto));
134 : 9 : sfs = &shared->sfs;
135 : 9 : SpinLockRelease(&shared->mutex);
136 : :
137 : 9 : SharedFileSetAttach(sfs, seg);
138 : :
139 : : /*
140 : : * Prepare to capture the concurrent data changes ourselves.
141 : : */
142 : 9 : decoding_ctx = repack_setup_logical_decoding(shared->relid);
143 : :
144 : : /* Announce that we're ready. */
145 : 9 : SpinLockAcquire(&shared->mutex);
146 : 9 : shared->initialized = true;
147 : 9 : SpinLockRelease(&shared->mutex);
148 : 9 : ConditionVariableSignal(&shared->cv);
149 : :
150 : : /* There doesn't seem to a nice API to set these */
151 : 9 : XactIsoLevel = XACT_REPEATABLE_READ;
152 : 9 : XactReadOnly = true;
153 : :
154 : : /* Build the initial snapshot and export it. */
155 : 9 : snapshot = SnapBuildInitialSnapshot(decoding_ctx->snapshot_builder);
156 : 9 : export_initial_snapshot(snapshot, shared);
157 : :
158 : : /*
159 : : * Only historic snapshots should be used now. Do not let us restrict the
160 : : * progress of xmin horizon.
161 : : */
162 : 9 : InvalidateCatalogSnapshot();
163 : :
164 : : for (;;)
165 : 9 : {
166 : 18 : bool stop = decode_concurrent_changes(decoding_ctx, shared);
167 : :
168 [ + + ]: 18 : if (stop)
169 : 9 : break;
170 : : }
171 : :
172 : : /* Clean up and report termination to our steering process */
173 : 9 : repack_cleanup_logical_decoding(decoding_ctx);
174 : 9 : CommitTransactionCommand();
3 175 : 9 : pq_putmessage(PqRepackMsg_Terminate, NULL, 0);
176 : : }
177 : :
178 : : /*
179 : : * Make sure the repack steering process tries to read from our error queue one
180 : : * more time. This guards against the case where we exit uncleanly without
181 : : * sending an ErrorResponse to the leader, for example because some code calls
182 : : * proc_exit directly.
183 : : */
184 : : static void
167 185 : 9 : RepackWorkerShutdown(int code, Datum arg)
186 : : {
187 : : dsm_segment *seg;
188 : : DecodingWorkerShared *shared;
189 : : pid_t pid;
190 : : ProcNumber procno;
191 : :
3 192 : 9 : seg = (dsm_segment *) DatumGetPointer(arg);
193 : 9 : shared = (DecodingWorkerShared *) dsm_segment_address(seg);
194 : 9 : pid = shared->backend_pid;
195 : 9 : procno = shared->backend_proc_number;
196 : :
197 : : /*
198 : : * Detach from the shared memory segment before we signal the backend.
199 : : * Detaching also detaches the error message queue, and the backend learns
200 : : * that we are gone by reading that queue when it handles our signal. If
201 : : * we signaled first, the backend could read the queue while it still
202 : : * looks attached, and nothing would make it read again.
203 : : */
204 : 9 : dsm_detach(seg);
205 : :
206 : 9 : SendProcSignal(pid, PROCSIG_REPACK_MESSAGE, procno);
167 207 : 9 : }
208 : :
209 : : bool
210 : 2039 : AmRepackWorker(void)
211 : : {
212 : 2039 : return am_repack_worker;
213 : : }
214 : :
215 : : /*
216 : : * This function is much like pg_create_logical_replication_slot() except that
217 : : * the new slot is neither released (if anyone else could read changes from
218 : : * our slot, we could miss changes other backends do while we copy the
219 : : * existing data into temporary table), nor persisted (it's easier to handle
220 : : * crash by restarting all the work from scratch).
221 : : */
222 : : static LogicalDecodingContext *
223 : 9 : repack_setup_logical_decoding(Oid relid)
224 : : {
225 : : Relation rel;
226 : : Oid toastrelid;
227 : : LogicalDecodingContext *ctx;
228 : : char slotname[NAMEDATALEN];
229 : : RepackDecodingState *dstate;
230 : : MemoryContext oldcxt;
231 : :
232 : : /*
233 : : * REPACK CONCURRENTLY is not allowed in a transaction block, so this
234 : : * should never fire.
235 : : */
236 [ - + ]: 9 : Assert(!TransactionIdIsValid(GetTopTransactionIdIfAny()));
237 : :
238 : : /* Make sure we can use logical decoding */
166 239 : 9 : CheckLogicalDecodingRequirements(true);
240 : :
241 : : /*
242 : : * Create the replication slot we'll use, and enable logical decoding in
243 : : * case it isn't already on.
244 : : *
245 : : * Make the slot RS_TEMPORARY so that it's removed on ERROR. A backend
246 : : * cannot execute multiple REPACK commands at a time, so the PID is enough
247 : : * to make the slot name unique.
248 : : */
103 249 : 9 : snprintf(slotname, NAMEDATALEN, "pg_repack_%d", MyProcPid);
250 : 9 : ReplicationSlotCreate(slotname, true, RS_TEMPORARY, false, true,
251 : : false, false);
167 252 : 9 : EnsureLogicalDecodingEnabled();
253 : :
254 : : /*
255 : : * Set up repacked_rel_locator and repacked_rel_toast_locator, which we
256 : : * use to skip decoding of unrelated relations.
257 : : */
258 : 9 : rel = table_open(relid, AccessShareLock);
259 : 9 : repacked_rel_locator = rel->rd_locator;
260 : 9 : toastrelid = rel->rd_rel->reltoastrelid;
261 [ + + ]: 9 : if (OidIsValid(toastrelid))
262 : : {
263 : : Relation toastrel;
264 : :
265 : : /* Avoid logical decoding of other TOAST relations. */
266 : 5 : toastrel = table_open(toastrelid, AccessShareLock);
267 : 5 : repacked_rel_toast_locator = toastrel->rd_locator;
268 : 5 : table_close(toastrel, AccessShareLock);
269 : : }
270 : 9 : table_close(rel, AccessShareLock);
271 : :
272 : : /*
273 : : * Set up our logical decoding context. We initially use the blocking
274 : : * read_local_xlog_page until we find the start point, and switch to the
275 : : * non-blocking interface afterwards.
276 : : */
103 277 : 9 : ctx = CreateInitDecodingContext(PGREPACK_PLUGIN,
278 : : NIL,
279 : : true,
280 : : true,
281 : : InvalidXLogRecPtr,
282 : 9 : XL_ROUTINE(.page_read = read_local_xlog_page,
283 : : .segment_open = wal_segment_open,
284 : : .segment_close = wal_segment_close),
285 : : NULL, NULL, NULL);
286 : :
287 : : /* Complete setup of output_writer_private */
288 : 9 : dstate = (RepackDecodingState *) ctx->output_writer_private;
289 : 9 : dstate->relid = relid;
290 : 9 : dstate->worker_cxt = CurrentMemoryContext;
291 : 9 : dstate->worker_resowner = CurrentResourceOwner;
292 : :
293 : : /* We don't have control on fast_forward, but verify it's sane */
294 [ - + ]: 9 : Assert(!ctx->fast_forward);
295 : :
296 : : /* Find our decoding starting point. */
297 : 9 : DecodingContextFindStartpoint(ctx);
298 : :
299 : : /* From this point on, we need non-blocking WAL reads */
300 : 9 : ctx->reader->routine.page_read = read_local_xlog_page_no_wait;
301 : :
302 : : /*
303 : : * Initialize repack_current_segment so that we can notice WAL segment
304 : : * boundaries.
305 : : */
167 306 : 9 : XLByteToSeg(ctx->reader->EndRecPtr, repack_current_segment,
307 : : wal_segment_size);
308 : :
309 : : /*
310 : : * Set up our reader private state to let the page-read callback notify
311 : : * when end-of-WAL has been reached. This lives in the same context as
312 : : * the logical decoding itself.
313 : : */
103 314 : 9 : oldcxt = MemoryContextSwitchTo(ctx->context);
167 315 : 9 : ctx->reader->private_data = palloc0_object(ReadLocalXLogPageNoWaitPrivate);
316 : 9 : MemoryContextSwitchTo(oldcxt);
317 : :
318 : 9 : return ctx;
319 : : }
320 : :
321 : : static void
322 : 9 : repack_cleanup_logical_decoding(LogicalDecodingContext *ctx)
323 : : {
324 : : RepackDecodingState *dstate;
325 : :
326 : 9 : dstate = (RepackDecodingState *) ctx->output_writer_private;
327 [ + + ]: 9 : if (dstate->slot)
328 : 2 : ExecDropSingleTupleTableSlot(dstate->slot);
329 : :
330 : 9 : FreeDecodingContext(ctx);
116 331 : 9 : ReplicationSlotDropAcquired(true);
167 332 : 9 : }
333 : :
334 : : /*
335 : : * Make snapshot available to the backend that launched the decoding worker.
336 : : */
337 : : static void
338 : 9 : export_initial_snapshot(Snapshot snapshot, DecodingWorkerShared *shared)
339 : : {
340 : : char fname[MAXPGPATH];
341 : : BufFile *file;
342 : : Size snap_size;
343 : : char *snap_space;
344 : :
345 : 9 : snap_size = EstimateSnapshotSpace(snapshot);
346 : 9 : snap_space = (char *) palloc(snap_size);
347 : 9 : SerializeSnapshot(snapshot, snap_space);
348 : :
349 : 9 : DecodingWorkerFileName(fname, shared->relid, shared->last_exported + 1);
350 : 9 : file = BufFileCreateFileSet(&shared->sfs.fs, fname);
351 : : /* To make restoration easier, write the snapshot size first. */
352 : 9 : BufFileWrite(file, &snap_size, sizeof(snap_size));
353 : 9 : BufFileWrite(file, snap_space, snap_size);
354 : 9 : BufFileClose(file);
166 355 : 9 : pfree(snap_space);
356 : :
357 : : /* Increase the counter to tell the backend that the file is available. */
167 358 : 9 : SpinLockAcquire(&shared->mutex);
359 : 9 : shared->last_exported++;
360 : 9 : SpinLockRelease(&shared->mutex);
361 : 9 : ConditionVariableSignal(&shared->cv);
362 : 9 : }
363 : :
364 : : /*
365 : : * Decode logical changes from the WAL sequence and store them to a file.
366 : : *
367 : : * If true is returned, there is no more work for the worker.
368 : : */
369 : : static bool
370 : 18 : decode_concurrent_changes(LogicalDecodingContext *ctx,
371 : : DecodingWorkerShared *shared)
372 : : {
373 : : RepackDecodingState *dstate;
374 : : XLogRecPtr lsn_upto;
375 : : bool done;
376 : : char fname[MAXPGPATH];
377 : :
378 : 18 : dstate = (RepackDecodingState *) ctx->output_writer_private;
379 : :
380 : : /* Open the output file. */
381 : 18 : DecodingWorkerFileName(fname, shared->relid, shared->last_exported + 1);
382 : 18 : dstate->file = BufFileCreateFileSet(&shared->sfs.fs, fname);
383 : :
384 : 18 : SpinLockAcquire(&shared->mutex);
385 : 18 : lsn_upto = shared->lsn_upto;
386 : 18 : done = shared->done;
387 : 18 : SpinLockRelease(&shared->mutex);
388 : :
389 : : while (true)
390 : 2226 : {
391 : : XLogRecord *record;
392 : : XLogSegNo segno_new;
393 : 2244 : char *errm = NULL;
394 : : XLogRecPtr end_lsn;
395 : :
396 [ - + ]: 2244 : CHECK_FOR_INTERRUPTS();
397 : :
398 : 2244 : record = XLogReadRecord(ctx->reader, &errm);
399 [ + + ]: 2244 : if (record)
400 : : {
401 : 1860 : LogicalDecodingProcessRecord(ctx, ctx->reader);
402 : :
403 : : /*
404 : : * We want to allow WAL to be recycled while REPACK is running.
405 : : *
406 : : * In normal usage of a replication slot, we need to be very
407 : : * careful not to advance the LSN until it's been confirmed as
408 : : * received by the remote. In REPACK's case, this is not needed:
409 : : * REPACK will never try to replay the same WAL after a crash, and
410 : : * if there _is_ a crash, the whole REPACK has to be started from
411 : : * scratch anyway.
412 : : *
413 : : * So here we disregard the careful LSN tracking and just move the
414 : : * LSN locations forward to what we've processed. Note that it
415 : : * would be bogus to move the xmin forward, though, so we don't
416 : : * touch that.
417 : : *
418 : : * This can be done on whatever schedule is convenient, but in
419 : : * order not to cause unnecessary load, we only do it as we cross
420 : : * each WAL segment boundary.
421 : : */
422 : 1860 : end_lsn = ctx->reader->EndRecPtr;
423 : 1860 : XLByteToSeg(end_lsn, segno_new, wal_segment_size);
424 [ - + ]: 1860 : if (segno_new != repack_current_segment)
425 : : {
113 alvherre@kurilemu.de 426 :UBC 0 : LogicalIncreaseRestartDecodingForSlot(end_lsn, end_lsn);
167 427 : 0 : LogicalConfirmReceivedLocation(end_lsn);
62 428 [ # # ]: 0 : elog(DEBUG1, "REPACK: confirmed receive location %X/%08X",
429 : : LSN_FORMAT_ARGS(end_lsn));
167 430 : 0 : repack_current_segment = segno_new;
431 : : }
432 : : }
433 : : else
434 : : {
435 : : ReadLocalXLogPageNoWaitPrivate *priv;
436 : :
167 alvherre@kurilemu.de 437 [ - + ]:CBC 384 : if (errm)
167 alvherre@kurilemu.de 438 [ # # ]:UBC 0 : ereport(ERROR,
439 : : errcode_for_file_access(),
440 : : errmsg("could not read WAL from timeline %u at %X/%08X: %s",
441 : : ctx->reader->currTLI,
442 : : LSN_FORMAT_ARGS(ctx->reader->EndRecPtr),
443 : : errm));
444 : :
445 : : /*
446 : : * In the decoding loop we do not want to get blocked when there
447 : : * is no more WAL available, otherwise the loop would become
448 : : * uninterruptible.
449 : : */
167 alvherre@kurilemu.de 450 :CBC 384 : priv = (ReadLocalXLogPageNoWaitPrivate *) ctx->reader->private_data;
451 [ + - ]: 384 : if (priv->end_of_wal)
452 : : /* Do not miss the end of WAL condition next time. */
453 : 384 : priv->end_of_wal = false;
454 : : else
167 alvherre@kurilemu.de 455 [ # # ]:UBC 0 : ereport(ERROR,
456 : : errcode(ERRCODE_DATA_CORRUPTED),
457 : : errmsg("could not read WAL record"));
458 : : }
459 : :
460 : : /*
461 : : * Whether we could read new record or not, keep checking if
462 : : * 'lsn_upto' was specified.
463 : : */
167 alvherre@kurilemu.de 464 [ + + ]:CBC 2244 : if (!XLogRecPtrIsValid(lsn_upto))
465 : : {
466 : 1977 : SpinLockAcquire(&shared->mutex);
467 : 1977 : lsn_upto = shared->lsn_upto;
468 : : /* 'done' should be set at the same time as 'lsn_upto' */
469 : 1977 : done = shared->done;
470 : 1977 : SpinLockRelease(&shared->mutex);
471 : : }
472 [ + + ]: 2244 : if (XLogRecPtrIsValid(lsn_upto) &&
473 [ + + ]: 284 : ctx->reader->EndRecPtr >= lsn_upto)
474 : 18 : break;
475 : :
476 [ + + ]: 2226 : if (record == NULL)
477 : : {
6 akorotkov@postgresql 478 : 375 : int timeout = 0;
479 : : WaitLSNResult res;
480 : :
481 : : /*
482 : : * Before we retry reading, wait until new WAL is flushed.
483 : : *
484 : : * There is a race condition such that the backend executing
485 : : * REPACK determines 'lsn_upto', but before it sets the shared
486 : : * variable, we reach the end of WAL. In that case we'd need to
487 : : * wait until the next WAL flush (unrelated to REPACK). Although
488 : : * that should not be a problem in a busy system, it might be
489 : : * noticeable in other cases, including regression tests (which
490 : : * are not necessarily executed in parallel). Therefore it makes
491 : : * sense to use timeout.
492 : : *
493 : : * If lsn_upto is valid, WAL records having LSN lower than that
494 : : * should already have been flushed to disk.
495 : : */
167 alvherre@kurilemu.de 496 [ + - ]: 375 : if (!XLogRecPtrIsValid(lsn_upto))
6 akorotkov@postgresql 497 : 375 : timeout = 100;
167 alvherre@kurilemu.de 498 : 375 : res = WaitForLSN(WAIT_LSN_TYPE_PRIMARY_FLUSH,
499 : 375 : ctx->reader->EndRecPtr + 1,
500 : : timeout);
501 [ + + - + ]: 375 : if (res != WAIT_LSN_RESULT_SUCCESS &&
502 : : res != WAIT_LSN_RESULT_TIMEOUT)
167 alvherre@kurilemu.de 503 [ # # ]:UBC 0 : ereport(ERROR,
504 : : errcode(ERRCODE_INTERNAL_ERROR),
505 : : errmsg("waiting for WAL failed"));
506 : : }
507 : : }
508 : :
509 : : /*
510 : : * Close the file so we can make it available to the backend.
511 : : */
167 alvherre@kurilemu.de 512 :CBC 18 : BufFileClose(dstate->file);
513 : 18 : dstate->file = NULL;
514 : 18 : SpinLockAcquire(&shared->mutex);
515 : 18 : shared->lsn_upto = InvalidXLogRecPtr;
516 : 18 : shared->last_exported++;
517 : 18 : SpinLockRelease(&shared->mutex);
518 : 18 : ConditionVariableSignal(&shared->cv);
519 : :
520 : 18 : return done;
521 : : }
522 : :
523 : : /*
524 : : * Does the WAL record contain a data change that this backend does not need
525 : : * to decode on behalf of REPACK (CONCURRENTLY)?
526 : : */
527 : : bool
528 : 1470495 : change_useless_for_repack(XLogRecordBuffer *buf)
529 : : {
530 : 1470495 : XLogReaderState *r = buf->record;
531 : : RelFileLocator locator;
532 : :
533 : : /* TOAST locator should not be set unless the main is. */
534 [ + + - + ]: 1470495 : Assert(!OidIsValid(repacked_rel_toast_locator.relNumber) ||
535 : : OidIsValid(repacked_rel_locator.relNumber));
536 : :
537 : : /*
538 : : * Backends not involved in REPACK (CONCURRENTLY) should not do the
539 : : * filtering.
540 : : */
541 [ + + ]: 1470495 : if (!OidIsValid(repacked_rel_locator.relNumber))
542 : 1469988 : return false;
543 : :
544 : : /*
545 : : * If the record does not contain the block 0, it's probably not INSERT /
546 : : * UPDATE / DELETE. In any case, we do not have enough information to
547 : : * filter the change out.
548 : : */
549 [ - + ]: 507 : if (!XLogRecGetBlockTagExtended(r, 0, &locator, NULL, NULL, NULL))
167 alvherre@kurilemu.de 550 :UBC 0 : return false;
551 : :
552 : : /*
553 : : * Decode the change if it belongs to the table we are repacking, or if it
554 : : * belongs to its TOAST relation.
555 : : */
167 alvherre@kurilemu.de 556 [ + + + - :CBC 507 : if (RelFileLocatorEquals(locator, repacked_rel_locator))
+ - ]
557 : 35 : return false;
558 [ + + ]: 472 : if (OidIsValid(repacked_rel_toast_locator.relNumber) &&
559 [ + + + - : 366 : RelFileLocatorEquals(locator, repacked_rel_toast_locator))
+ - ]
560 : 50 : return false;
561 : :
562 : : /* Filter out changes of other tables. */
563 : 422 : return true;
564 : : }
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