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origin.c
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1 /*-------------------------------------------------------------------------
2  *
3  * origin.c
4  * Logical replication progress tracking support.
5  *
6  * Copyright (c) 2013-2021, PostgreSQL Global Development Group
7  *
8  * IDENTIFICATION
9  * src/backend/replication/logical/origin.c
10  *
11  * NOTES
12  *
13  * This file provides the following:
14  * * An infrastructure to name nodes in a replication setup
15  * * A facility to efficiently store and persist replication progress in an
16  * efficient and durable manner.
17  *
18  * Replication origin consist out of a descriptive, user defined, external
19  * name and a short, thus space efficient, internal 2 byte one. This split
20  * exists because replication origin have to be stored in WAL and shared
21  * memory and long descriptors would be inefficient. For now only use 2 bytes
22  * for the internal id of a replication origin as it seems unlikely that there
23  * soon will be more than 65k nodes in one replication setup; and using only
24  * two bytes allow us to be more space efficient.
25  *
26  * Replication progress is tracked in a shared memory table
27  * (ReplicationState) that's dumped to disk every checkpoint. Entries
28  * ('slots') in this table are identified by the internal id. That's the case
29  * because it allows to increase replication progress during crash
30  * recovery. To allow doing so we store the original LSN (from the originating
31  * system) of a transaction in the commit record. That allows to recover the
32  * precise replayed state after crash recovery; without requiring synchronous
33  * commits. Allowing logical replication to use asynchronous commit is
34  * generally good for performance, but especially important as it allows a
35  * single threaded replay process to keep up with a source that has multiple
36  * backends generating changes concurrently. For efficiency and simplicity
37  * reasons a backend can setup one replication origin that's from then used as
38  * the source of changes produced by the backend, until reset again.
39  *
40  * This infrastructure is intended to be used in cooperation with logical
41  * decoding. When replaying from a remote system the configured origin is
42  * provided to output plugins, allowing prevention of replication loops and
43  * other filtering.
44  *
45  * There are several levels of locking at work:
46  *
47  * * To create and drop replication origins an exclusive lock on
48  * pg_replication_slot is required for the duration. That allows us to
49  * safely and conflict free assign new origins using a dirty snapshot.
50  *
51  * * When creating an in-memory replication progress slot the ReplicationOrigin
52  * LWLock has to be held exclusively; when iterating over the replication
53  * progress a shared lock has to be held, the same when advancing the
54  * replication progress of an individual backend that has not setup as the
55  * session's replication origin.
56  *
57  * * When manipulating or looking at the remote_lsn and local_lsn fields of a
58  * replication progress slot that slot's lwlock has to be held. That's
59  * primarily because we do not assume 8 byte writes (the LSN) is atomic on
60  * all our platforms, but it also simplifies memory ordering concerns
61  * between the remote and local lsn. We use a lwlock instead of a spinlock
62  * so it's less harmful to hold the lock over a WAL write
63  * (cf. AdvanceReplicationProgress).
64  *
65  * ---------------------------------------------------------------------------
66  */
67 
68 #include "postgres.h"
69 
70 #include <unistd.h>
71 #include <sys/stat.h>
72 
73 #include "access/genam.h"
74 #include "access/htup_details.h"
75 #include "access/table.h"
76 #include "access/xact.h"
77 #include "catalog/catalog.h"
78 #include "catalog/indexing.h"
79 #include "funcapi.h"
80 #include "miscadmin.h"
81 #include "nodes/execnodes.h"
82 #include "pgstat.h"
83 #include "replication/logical.h"
84 #include "replication/origin.h"
86 #include "storage/copydir.h"
87 #include "storage/fd.h"
88 #include "storage/ipc.h"
89 #include "storage/lmgr.h"
90 #include "utils/builtins.h"
91 #include "utils/fmgroids.h"
92 #include "utils/pg_lsn.h"
93 #include "utils/rel.h"
94 #include "utils/snapmgr.h"
95 #include "utils/syscache.h"
96 
97 /*
98  * Replay progress of a single remote node.
99  */
100 typedef struct ReplicationState
101 {
102  /*
103  * Local identifier for the remote node.
104  */
106 
107  /*
108  * Location of the latest commit from the remote side.
109  */
111 
112  /*
113  * Remember the local lsn of the commit record so we can XLogFlush() to it
114  * during a checkpoint so we know the commit record actually is safe on
115  * disk.
116  */
118 
119  /*
120  * PID of backend that's acquired slot, or 0 if none.
121  */
123 
124  /*
125  * Condition variable that's signaled when acquired_by changes.
126  */
128 
129  /*
130  * Lock protecting remote_lsn and local_lsn.
131  */
134 
135 /*
136  * On disk version of ReplicationState.
137  */
139 {
143 
144 
145 typedef struct ReplicationStateCtl
146 {
147  /* Tranche to use for per-origin LWLocks */
149  /* Array of length max_replication_slots */
152 
153 /* external variables */
157 
158 /*
159  * Base address into a shared memory array of replication states of size
160  * max_replication_slots.
161  *
162  * XXX: Should we use a separate variable to size this rather than
163  * max_replication_slots?
164  */
166 
167 /*
168  * Actual shared memory block (replication_states[] is now part of this).
169  */
171 
172 /*
173  * Backend-local, cached element from ReplicationState for use in a backend
174  * replaying remote commits, so we don't have to search ReplicationState for
175  * the backends current RepOriginId.
176  */
178 
179 /* Magic for on disk files. */
180 #define REPLICATION_STATE_MAGIC ((uint32) 0x1257DADE)
181 
182 static void
183 replorigin_check_prerequisites(bool check_slots, bool recoveryOK)
184 {
185  if (check_slots && max_replication_slots == 0)
186  ereport(ERROR,
187  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
188  errmsg("cannot query or manipulate replication origin when max_replication_slots = 0")));
189 
190  if (!recoveryOK && RecoveryInProgress())
191  ereport(ERROR,
192  (errcode(ERRCODE_READ_ONLY_SQL_TRANSACTION),
193  errmsg("cannot manipulate replication origins during recovery")));
194 
195 }
196 
197 
198 /* ---------------------------------------------------------------------------
199  * Functions for working with replication origins themselves.
200  * ---------------------------------------------------------------------------
201  */
202 
203 /*
204  * Check for a persistent replication origin identified by name.
205  *
206  * Returns InvalidOid if the node isn't known yet and missing_ok is true.
207  */
209 replorigin_by_name(char *roname, bool missing_ok)
210 {
213  HeapTuple tuple;
214  Datum roname_d;
215 
216  roname_d = CStringGetTextDatum(roname);
217 
218  tuple = SearchSysCache1(REPLORIGNAME, roname_d);
219  if (HeapTupleIsValid(tuple))
220  {
221  ident = (Form_pg_replication_origin) GETSTRUCT(tuple);
222  roident = ident->roident;
223  ReleaseSysCache(tuple);
224  }
225  else if (!missing_ok)
226  ereport(ERROR,
227  (errcode(ERRCODE_UNDEFINED_OBJECT),
228  errmsg("replication origin \"%s\" does not exist",
229  roname)));
230 
231  return roident;
232 }
233 
234 /*
235  * Create a replication origin.
236  *
237  * Needs to be called in a transaction.
238  */
240 replorigin_create(char *roname)
241 {
242  Oid roident;
243  HeapTuple tuple = NULL;
244  Relation rel;
245  Datum roname_d;
246  SnapshotData SnapshotDirty;
247  SysScanDesc scan;
249 
250  roname_d = CStringGetTextDatum(roname);
251 
253 
254  /*
255  * We need the numeric replication origin to be 16bit wide, so we cannot
256  * rely on the normal oid allocation. Instead we simply scan
257  * pg_replication_origin for the first unused id. That's not particularly
258  * efficient, but this should be a fairly infrequent operation - we can
259  * easily spend a bit more code on this when it turns out it needs to be
260  * faster.
261  *
262  * We handle concurrency by taking an exclusive lock (allowing reads!)
263  * over the table for the duration of the search. Because we use a "dirty
264  * snapshot" we can read rows that other in-progress sessions have
265  * written, even though they would be invisible with normal snapshots. Due
266  * to the exclusive lock there's no danger that new rows can appear while
267  * we're checking.
268  */
269  InitDirtySnapshot(SnapshotDirty);
270 
271  rel = table_open(ReplicationOriginRelationId, ExclusiveLock);
272 
273  for (roident = InvalidOid + 1; roident < PG_UINT16_MAX; roident++)
274  {
275  bool nulls[Natts_pg_replication_origin];
276  Datum values[Natts_pg_replication_origin];
277  bool collides;
278 
280 
281  ScanKeyInit(&key,
282  Anum_pg_replication_origin_roident,
283  BTEqualStrategyNumber, F_OIDEQ,
284  ObjectIdGetDatum(roident));
285 
287  true /* indexOK */ ,
288  &SnapshotDirty,
289  1, &key);
290 
291  collides = HeapTupleIsValid(systable_getnext(scan));
292 
293  systable_endscan(scan);
294 
295  if (!collides)
296  {
297  /*
298  * Ok, found an unused roident, insert the new row and do a CCI,
299  * so our callers can look it up if they want to.
300  */
301  memset(&nulls, 0, sizeof(nulls));
302 
303  values[Anum_pg_replication_origin_roident - 1] = ObjectIdGetDatum(roident);
304  values[Anum_pg_replication_origin_roname - 1] = roname_d;
305 
306  tuple = heap_form_tuple(RelationGetDescr(rel), values, nulls);
307  CatalogTupleInsert(rel, tuple);
309  break;
310  }
311  }
312 
313  /* now release lock again, */
315 
316  if (tuple == NULL)
317  ereport(ERROR,
318  (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
319  errmsg("could not find free replication origin OID")));
320 
321  heap_freetuple(tuple);
322  return roident;
323 }
324 
325 /*
326  * Helper function to drop a replication origin.
327  */
328 static void
330 {
331  HeapTuple tuple;
332  int i;
333 
334  /*
335  * First, clean up the slot state info, if there is any matching slot.
336  */
337 restart:
338  tuple = NULL;
339  LWLockAcquire(ReplicationOriginLock, LW_EXCLUSIVE);
340 
341  for (i = 0; i < max_replication_slots; i++)
342  {
343  ReplicationState *state = &replication_states[i];
344 
345  if (state->roident == roident)
346  {
347  /* found our slot, is it busy? */
348  if (state->acquired_by != 0)
349  {
350  ConditionVariable *cv;
351 
352  if (nowait)
353  ereport(ERROR,
354  (errcode(ERRCODE_OBJECT_IN_USE),
355  errmsg("could not drop replication origin with OID %d, in use by PID %d",
356  state->roident,
357  state->acquired_by)));
358 
359  /*
360  * We must wait and then retry. Since we don't know which CV
361  * to wait on until here, we can't readily use
362  * ConditionVariablePrepareToSleep (calling it here would be
363  * wrong, since we could miss the signal if we did so); just
364  * use ConditionVariableSleep directly.
365  */
366  cv = &state->origin_cv;
367 
368  LWLockRelease(ReplicationOriginLock);
369 
371  goto restart;
372  }
373 
374  /* first make a WAL log entry */
375  {
376  xl_replorigin_drop xlrec;
377 
378  xlrec.node_id = roident;
379  XLogBeginInsert();
380  XLogRegisterData((char *) (&xlrec), sizeof(xlrec));
381  XLogInsert(RM_REPLORIGIN_ID, XLOG_REPLORIGIN_DROP);
382  }
383 
384  /* then clear the in-memory slot */
385  state->roident = InvalidRepOriginId;
386  state->remote_lsn = InvalidXLogRecPtr;
387  state->local_lsn = InvalidXLogRecPtr;
388  break;
389  }
390  }
391  LWLockRelease(ReplicationOriginLock);
393 
394  /*
395  * Now, we can delete the catalog entry.
396  */
398  if (!HeapTupleIsValid(tuple))
399  elog(ERROR, "cache lookup failed for replication origin with oid %u",
400  roident);
401 
402  CatalogTupleDelete(rel, &tuple->t_self);
403  ReleaseSysCache(tuple);
404 
406 }
407 
408 /*
409  * Drop replication origin (by name).
410  *
411  * Needs to be called in a transaction.
412  */
413 void
414 replorigin_drop_by_name(char *name, bool missing_ok, bool nowait)
415 {
417  Relation rel;
418 
420 
421  /*
422  * To interlock against concurrent drops, we hold ExclusiveLock on
423  * pg_replication_origin till xact commit.
424  *
425  * XXX We can optimize this by acquiring the lock on a specific origin by
426  * using LockSharedObject if required. However, for that, we first to
427  * acquire a lock on ReplicationOriginRelationId, get the origin_id, lock
428  * the specific origin and then re-check if the origin still exists.
429  */
430  rel = table_open(ReplicationOriginRelationId, ExclusiveLock);
431 
432  roident = replorigin_by_name(name, missing_ok);
433 
434  if (OidIsValid(roident))
435  replorigin_drop_guts(rel, roident, nowait);
436 
437  /* We keep the lock on pg_replication_origin until commit */
438  table_close(rel, NoLock);
439 }
440 
441 /*
442  * Lookup replication origin via its oid and return the name.
443  *
444  * The external name is palloc'd in the calling context.
445  *
446  * Returns true if the origin is known, false otherwise.
447  */
448 bool
449 replorigin_by_oid(RepOriginId roident, bool missing_ok, char **roname)
450 {
451  HeapTuple tuple;
453 
454  Assert(OidIsValid((Oid) roident));
455  Assert(roident != InvalidRepOriginId);
456  Assert(roident != DoNotReplicateId);
457 
459  ObjectIdGetDatum((Oid) roident));
460 
461  if (HeapTupleIsValid(tuple))
462  {
463  ric = (Form_pg_replication_origin) GETSTRUCT(tuple);
464  *roname = text_to_cstring(&ric->roname);
465  ReleaseSysCache(tuple);
466 
467  return true;
468  }
469  else
470  {
471  *roname = NULL;
472 
473  if (!missing_ok)
474  ereport(ERROR,
475  (errcode(ERRCODE_UNDEFINED_OBJECT),
476  errmsg("replication origin with OID %u does not exist",
477  roident)));
478 
479  return false;
480  }
481 }
482 
483 
484 /* ---------------------------------------------------------------------------
485  * Functions for handling replication progress.
486  * ---------------------------------------------------------------------------
487  */
488 
489 Size
491 {
492  Size size = 0;
493 
494  /*
495  * XXX: max_replication_slots is arguably the wrong thing to use, as here
496  * we keep the replay state of *remote* transactions. But for now it seems
497  * sufficient to reuse it, rather than introduce a separate GUC.
498  */
499  if (max_replication_slots == 0)
500  return size;
501 
502  size = add_size(size, offsetof(ReplicationStateCtl, states));
503 
504  size = add_size(size,
506  return size;
507 }
508 
509 void
511 {
512  bool found;
513 
514  if (max_replication_slots == 0)
515  return;
516 
517  replication_states_ctl = (ReplicationStateCtl *)
518  ShmemInitStruct("ReplicationOriginState",
520  &found);
521  replication_states = replication_states_ctl->states;
522 
523  if (!found)
524  {
525  int i;
526 
527  MemSet(replication_states_ctl, 0, ReplicationOriginShmemSize());
528 
529  replication_states_ctl->tranche_id = LWTRANCHE_REPLICATION_ORIGIN_STATE;
530 
531  for (i = 0; i < max_replication_slots; i++)
532  {
533  LWLockInitialize(&replication_states[i].lock,
534  replication_states_ctl->tranche_id);
535  ConditionVariableInit(&replication_states[i].origin_cv);
536  }
537  }
538 }
539 
540 /* ---------------------------------------------------------------------------
541  * Perform a checkpoint of each replication origin's progress with respect to
542  * the replayed remote_lsn. Make sure that all transactions we refer to in the
543  * checkpoint (local_lsn) are actually on-disk. This might not yet be the case
544  * if the transactions were originally committed asynchronously.
545  *
546  * We store checkpoints in the following format:
547  * +-------+------------------------+------------------+-----+--------+
548  * | MAGIC | ReplicationStateOnDisk | struct Replic... | ... | CRC32C | EOF
549  * +-------+------------------------+------------------+-----+--------+
550  *
551  * So its just the magic, followed by the statically sized
552  * ReplicationStateOnDisk structs. Note that the maximum number of
553  * ReplicationState is determined by max_replication_slots.
554  * ---------------------------------------------------------------------------
555  */
556 void
558 {
559  const char *tmppath = "pg_logical/replorigin_checkpoint.tmp";
560  const char *path = "pg_logical/replorigin_checkpoint";
561  int tmpfd;
562  int i;
564  pg_crc32c crc;
565 
566  if (max_replication_slots == 0)
567  return;
568 
569  INIT_CRC32C(crc);
570 
571  /* make sure no old temp file is remaining */
572  if (unlink(tmppath) < 0 && errno != ENOENT)
573  ereport(PANIC,
575  errmsg("could not remove file \"%s\": %m",
576  tmppath)));
577 
578  /*
579  * no other backend can perform this at the same time; only one
580  * checkpoint can happen at a time.
581  */
582  tmpfd = OpenTransientFile(tmppath,
583  O_CREAT | O_EXCL | O_WRONLY | PG_BINARY);
584  if (tmpfd < 0)
585  ereport(PANIC,
587  errmsg("could not create file \"%s\": %m",
588  tmppath)));
589 
590  /* write magic */
591  errno = 0;
592  if ((write(tmpfd, &magic, sizeof(magic))) != sizeof(magic))
593  {
594  /* if write didn't set errno, assume problem is no disk space */
595  if (errno == 0)
596  errno = ENOSPC;
597  ereport(PANIC,
599  errmsg("could not write to file \"%s\": %m",
600  tmppath)));
601  }
602  COMP_CRC32C(crc, &magic, sizeof(magic));
603 
604  /* prevent concurrent creations/drops */
605  LWLockAcquire(ReplicationOriginLock, LW_SHARED);
606 
607  /* write actual data */
608  for (i = 0; i < max_replication_slots; i++)
609  {
610  ReplicationStateOnDisk disk_state;
611  ReplicationState *curstate = &replication_states[i];
613 
614  if (curstate->roident == InvalidRepOriginId)
615  continue;
616 
617  /* zero, to avoid uninitialized padding bytes */
618  memset(&disk_state, 0, sizeof(disk_state));
619 
620  LWLockAcquire(&curstate->lock, LW_SHARED);
621 
622  disk_state.roident = curstate->roident;
623 
624  disk_state.remote_lsn = curstate->remote_lsn;
625  local_lsn = curstate->local_lsn;
626 
627  LWLockRelease(&curstate->lock);
628 
629  /* make sure we only write out a commit that's persistent */
630  XLogFlush(local_lsn);
631 
632  errno = 0;
633  if ((write(tmpfd, &disk_state, sizeof(disk_state))) !=
634  sizeof(disk_state))
635  {
636  /* if write didn't set errno, assume problem is no disk space */
637  if (errno == 0)
638  errno = ENOSPC;
639  ereport(PANIC,
641  errmsg("could not write to file \"%s\": %m",
642  tmppath)));
643  }
644 
645  COMP_CRC32C(crc, &disk_state, sizeof(disk_state));
646  }
647 
648  LWLockRelease(ReplicationOriginLock);
649 
650  /* write out the CRC */
651  FIN_CRC32C(crc);
652  errno = 0;
653  if ((write(tmpfd, &crc, sizeof(crc))) != sizeof(crc))
654  {
655  /* if write didn't set errno, assume problem is no disk space */
656  if (errno == 0)
657  errno = ENOSPC;
658  ereport(PANIC,
660  errmsg("could not write to file \"%s\": %m",
661  tmppath)));
662  }
663 
664  if (CloseTransientFile(tmpfd) != 0)
665  ereport(PANIC,
667  errmsg("could not close file \"%s\": %m",
668  tmppath)));
669 
670  /* fsync, rename to permanent file, fsync file and directory */
671  durable_rename(tmppath, path, PANIC);
672 }
673 
674 /*
675  * Recover replication replay status from checkpoint data saved earlier by
676  * CheckPointReplicationOrigin.
677  *
678  * This only needs to be called at startup and *not* during every checkpoint
679  * read during recovery (e.g. in HS or PITR from a base backup) afterwards. All
680  * state thereafter can be recovered by looking at commit records.
681  */
682 void
684 {
685  const char *path = "pg_logical/replorigin_checkpoint";
686  int fd;
687  int readBytes;
689  int last_state = 0;
690  pg_crc32c file_crc;
691  pg_crc32c crc;
692 
693  /* don't want to overwrite already existing state */
694 #ifdef USE_ASSERT_CHECKING
695  static bool already_started = false;
696 
697  Assert(!already_started);
698  already_started = true;
699 #endif
700 
701  if (max_replication_slots == 0)
702  return;
703 
704  INIT_CRC32C(crc);
705 
706  elog(DEBUG2, "starting up replication origin progress state");
707 
708  fd = OpenTransientFile(path, O_RDONLY | PG_BINARY);
709 
710  /*
711  * might have had max_replication_slots == 0 last run, or we just brought
712  * up a standby.
713  */
714  if (fd < 0 && errno == ENOENT)
715  return;
716  else if (fd < 0)
717  ereport(PANIC,
719  errmsg("could not open file \"%s\": %m",
720  path)));
721 
722  /* verify magic, that is written even if nothing was active */
723  readBytes = read(fd, &magic, sizeof(magic));
724  if (readBytes != sizeof(magic))
725  {
726  if (readBytes < 0)
727  ereport(PANIC,
729  errmsg("could not read file \"%s\": %m",
730  path)));
731  else
732  ereport(PANIC,
734  errmsg("could not read file \"%s\": read %d of %zu",
735  path, readBytes, sizeof(magic))));
736  }
737  COMP_CRC32C(crc, &magic, sizeof(magic));
738 
739  if (magic != REPLICATION_STATE_MAGIC)
740  ereport(PANIC,
741  (errmsg("replication checkpoint has wrong magic %u instead of %u",
742  magic, REPLICATION_STATE_MAGIC)));
743 
744  /* we can skip locking here, no other access is possible */
745 
746  /* recover individual states, until there are no more to be found */
747  while (true)
748  {
749  ReplicationStateOnDisk disk_state;
750 
751  readBytes = read(fd, &disk_state, sizeof(disk_state));
752 
753  /* no further data */
754  if (readBytes == sizeof(crc))
755  {
756  /* not pretty, but simple ... */
757  file_crc = *(pg_crc32c *) &disk_state;
758  break;
759  }
760 
761  if (readBytes < 0)
762  {
763  ereport(PANIC,
765  errmsg("could not read file \"%s\": %m",
766  path)));
767  }
768 
769  if (readBytes != sizeof(disk_state))
770  {
771  ereport(PANIC,
773  errmsg("could not read file \"%s\": read %d of %zu",
774  path, readBytes, sizeof(disk_state))));
775  }
776 
777  COMP_CRC32C(crc, &disk_state, sizeof(disk_state));
778 
779  if (last_state == max_replication_slots)
780  ereport(PANIC,
781  (errcode(ERRCODE_CONFIGURATION_LIMIT_EXCEEDED),
782  errmsg("could not find free replication state, increase max_replication_slots")));
783 
784  /* copy data to shared memory */
785  replication_states[last_state].roident = disk_state.roident;
786  replication_states[last_state].remote_lsn = disk_state.remote_lsn;
787  last_state++;
788 
789  ereport(LOG,
790  (errmsg("recovered replication state of node %u to %X/%X",
791  disk_state.roident,
792  LSN_FORMAT_ARGS(disk_state.remote_lsn))));
793  }
794 
795  /* now check checksum */
796  FIN_CRC32C(crc);
797  if (file_crc != crc)
798  ereport(PANIC,
799  (errcode(ERRCODE_CONFIGURATION_LIMIT_EXCEEDED),
800  errmsg("replication slot checkpoint has wrong checksum %u, expected %u",
801  crc, file_crc)));
802 
803  if (CloseTransientFile(fd) != 0)
804  ereport(PANIC,
806  errmsg("could not close file \"%s\": %m",
807  path)));
808 }
809 
810 void
812 {
813  uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
814 
815  switch (info)
816  {
817  case XLOG_REPLORIGIN_SET:
818  {
819  xl_replorigin_set *xlrec =
820  (xl_replorigin_set *) XLogRecGetData(record);
821 
823  xlrec->remote_lsn, record->EndRecPtr,
824  xlrec->force /* backward */ ,
825  false /* WAL log */ );
826  break;
827  }
829  {
830  xl_replorigin_drop *xlrec;
831  int i;
832 
833  xlrec = (xl_replorigin_drop *) XLogRecGetData(record);
834 
835  for (i = 0; i < max_replication_slots; i++)
836  {
837  ReplicationState *state = &replication_states[i];
838 
839  /* found our slot */
840  if (state->roident == xlrec->node_id)
841  {
842  /* reset entry */
843  state->roident = InvalidRepOriginId;
844  state->remote_lsn = InvalidXLogRecPtr;
845  state->local_lsn = InvalidXLogRecPtr;
846  break;
847  }
848  }
849  break;
850  }
851  default:
852  elog(PANIC, "replorigin_redo: unknown op code %u", info);
853  }
854 }
855 
856 
857 /*
858  * Tell the replication origin progress machinery that a commit from 'node'
859  * that originated at the LSN remote_commit on the remote node was replayed
860  * successfully and that we don't need to do so again. In combination with
861  * setting up replorigin_session_origin_lsn and replorigin_session_origin
862  * that ensures we won't lose knowledge about that after a crash if the
863  * transaction had a persistent effect (think of asynchronous commits).
864  *
865  * local_commit needs to be a local LSN of the commit so that we can make sure
866  * upon a checkpoint that enough WAL has been persisted to disk.
867  *
868  * Needs to be called with a RowExclusiveLock on pg_replication_origin,
869  * unless running in recovery.
870  */
871 void
873  XLogRecPtr remote_commit, XLogRecPtr local_commit,
874  bool go_backward, bool wal_log)
875 {
876  int i;
877  ReplicationState *replication_state = NULL;
878  ReplicationState *free_state = NULL;
879 
880  Assert(node != InvalidRepOriginId);
881 
882  /* we don't track DoNotReplicateId */
883  if (node == DoNotReplicateId)
884  return;
885 
886  /*
887  * XXX: For the case where this is called by WAL replay, it'd be more
888  * efficient to restore into a backend local hashtable and only dump into
889  * shmem after recovery is finished. Let's wait with implementing that
890  * till it's shown to be a measurable expense
891  */
892 
893  /* Lock exclusively, as we may have to create a new table entry. */
894  LWLockAcquire(ReplicationOriginLock, LW_EXCLUSIVE);
895 
896  /*
897  * Search for either an existing slot for the origin, or a free one we can
898  * use.
899  */
900  for (i = 0; i < max_replication_slots; i++)
901  {
902  ReplicationState *curstate = &replication_states[i];
903 
904  /* remember where to insert if necessary */
905  if (curstate->roident == InvalidRepOriginId &&
906  free_state == NULL)
907  {
908  free_state = curstate;
909  continue;
910  }
911 
912  /* not our slot */
913  if (curstate->roident != node)
914  {
915  continue;
916  }
917 
918  /* ok, found slot */
919  replication_state = curstate;
920 
921  LWLockAcquire(&replication_state->lock, LW_EXCLUSIVE);
922 
923  /* Make sure it's not used by somebody else */
924  if (replication_state->acquired_by != 0)
925  {
926  ereport(ERROR,
927  (errcode(ERRCODE_OBJECT_IN_USE),
928  errmsg("replication origin with OID %d is already active for PID %d",
929  replication_state->roident,
930  replication_state->acquired_by)));
931  }
932 
933  break;
934  }
935 
936  if (replication_state == NULL && free_state == NULL)
937  ereport(ERROR,
938  (errcode(ERRCODE_CONFIGURATION_LIMIT_EXCEEDED),
939  errmsg("could not find free replication state slot for replication origin with OID %u",
940  node),
941  errhint("Increase max_replication_slots and try again.")));
942 
943  if (replication_state == NULL)
944  {
945  /* initialize new slot */
946  LWLockAcquire(&free_state->lock, LW_EXCLUSIVE);
947  replication_state = free_state;
948  Assert(replication_state->remote_lsn == InvalidXLogRecPtr);
949  Assert(replication_state->local_lsn == InvalidXLogRecPtr);
950  replication_state->roident = node;
951  }
952 
953  Assert(replication_state->roident != InvalidRepOriginId);
954 
955  /*
956  * If somebody "forcefully" sets this slot, WAL log it, so it's durable
957  * and the standby gets the message. Primarily this will be called during
958  * WAL replay (of commit records) where no WAL logging is necessary.
959  */
960  if (wal_log)
961  {
962  xl_replorigin_set xlrec;
963 
964  xlrec.remote_lsn = remote_commit;
965  xlrec.node_id = node;
966  xlrec.force = go_backward;
967 
968  XLogBeginInsert();
969  XLogRegisterData((char *) (&xlrec), sizeof(xlrec));
970 
971  XLogInsert(RM_REPLORIGIN_ID, XLOG_REPLORIGIN_SET);
972  }
973 
974  /*
975  * Due to - harmless - race conditions during a checkpoint we could see
976  * values here that are older than the ones we already have in memory.
977  * Don't overwrite those.
978  */
979  if (go_backward || replication_state->remote_lsn < remote_commit)
980  replication_state->remote_lsn = remote_commit;
981  if (local_commit != InvalidXLogRecPtr &&
982  (go_backward || replication_state->local_lsn < local_commit))
983  replication_state->local_lsn = local_commit;
984  LWLockRelease(&replication_state->lock);
985 
986  /*
987  * Release *after* changing the LSNs, slot isn't acquired and thus could
988  * otherwise be dropped anytime.
989  */
990  LWLockRelease(ReplicationOriginLock);
991 }
992 
993 
996 {
997  int i;
1000 
1001  /* prevent slots from being concurrently dropped */
1002  LWLockAcquire(ReplicationOriginLock, LW_SHARED);
1003 
1004  for (i = 0; i < max_replication_slots; i++)
1005  {
1007 
1008  state = &replication_states[i];
1009 
1010  if (state->roident == node)
1011  {
1012  LWLockAcquire(&state->lock, LW_SHARED);
1013 
1014  remote_lsn = state->remote_lsn;
1015  local_lsn = state->local_lsn;
1016 
1017  LWLockRelease(&state->lock);
1018 
1019  break;
1020  }
1021  }
1022 
1023  LWLockRelease(ReplicationOriginLock);
1024 
1025  if (flush && local_lsn != InvalidXLogRecPtr)
1026  XLogFlush(local_lsn);
1027 
1028  return remote_lsn;
1029 }
1030 
1031 /*
1032  * Tear down a (possibly) configured session replication origin during process
1033  * exit.
1034  */
1035 static void
1037 {
1038  ConditionVariable *cv = NULL;
1039 
1040  LWLockAcquire(ReplicationOriginLock, LW_EXCLUSIVE);
1041 
1042  if (session_replication_state != NULL &&
1043  session_replication_state->acquired_by == MyProcPid)
1044  {
1045  cv = &session_replication_state->origin_cv;
1046 
1047  session_replication_state->acquired_by = 0;
1048  session_replication_state = NULL;
1049  }
1050 
1051  LWLockRelease(ReplicationOriginLock);
1052 
1053  if (cv)
1055 }
1056 
1057 /*
1058  * Setup a replication origin in the shared memory struct if it doesn't
1059  * already exists and cache access to the specific ReplicationSlot so the
1060  * array doesn't have to be searched when calling
1061  * replorigin_session_advance().
1062  *
1063  * Obviously only one such cached origin can exist per process and the current
1064  * cached value can only be set again after the previous value is torn down
1065  * with replorigin_session_reset().
1066  */
1067 void
1069 {
1070  static bool registered_cleanup;
1071  int i;
1072  int free_slot = -1;
1073 
1074  if (!registered_cleanup)
1075  {
1077  registered_cleanup = true;
1078  }
1079 
1081 
1082  if (session_replication_state != NULL)
1083  ereport(ERROR,
1084  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1085  errmsg("cannot setup replication origin when one is already setup")));
1086 
1087  /* Lock exclusively, as we may have to create a new table entry. */
1088  LWLockAcquire(ReplicationOriginLock, LW_EXCLUSIVE);
1089 
1090  /*
1091  * Search for either an existing slot for the origin, or a free one we can
1092  * use.
1093  */
1094  for (i = 0; i < max_replication_slots; i++)
1095  {
1096  ReplicationState *curstate = &replication_states[i];
1097 
1098  /* remember where to insert if necessary */
1099  if (curstate->roident == InvalidRepOriginId &&
1100  free_slot == -1)
1101  {
1102  free_slot = i;
1103  continue;
1104  }
1105 
1106  /* not our slot */
1107  if (curstate->roident != node)
1108  continue;
1109 
1110  else if (curstate->acquired_by != 0)
1111  {
1112  ereport(ERROR,
1113  (errcode(ERRCODE_OBJECT_IN_USE),
1114  errmsg("replication origin with OID %d is already active for PID %d",
1115  curstate->roident, curstate->acquired_by)));
1116  }
1117 
1118  /* ok, found slot */
1119  session_replication_state = curstate;
1120  }
1121 
1122 
1123  if (session_replication_state == NULL && free_slot == -1)
1124  ereport(ERROR,
1125  (errcode(ERRCODE_CONFIGURATION_LIMIT_EXCEEDED),
1126  errmsg("could not find free replication state slot for replication origin with OID %u",
1127  node),
1128  errhint("Increase max_replication_slots and try again.")));
1129  else if (session_replication_state == NULL)
1130  {
1131  /* initialize new slot */
1132  session_replication_state = &replication_states[free_slot];
1133  Assert(session_replication_state->remote_lsn == InvalidXLogRecPtr);
1134  Assert(session_replication_state->local_lsn == InvalidXLogRecPtr);
1135  session_replication_state->roident = node;
1136  }
1137 
1138 
1139  Assert(session_replication_state->roident != InvalidRepOriginId);
1140 
1141  session_replication_state->acquired_by = MyProcPid;
1142 
1143  LWLockRelease(ReplicationOriginLock);
1144 
1145  /* probably this one is pointless */
1146  ConditionVariableBroadcast(&session_replication_state->origin_cv);
1147 }
1148 
1149 /*
1150  * Reset replay state previously setup in this session.
1151  *
1152  * This function may only be called if an origin was setup with
1153  * replorigin_session_setup().
1154  */
1155 void
1157 {
1158  ConditionVariable *cv;
1159 
1161 
1162  if (session_replication_state == NULL)
1163  ereport(ERROR,
1164  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1165  errmsg("no replication origin is configured")));
1166 
1167  LWLockAcquire(ReplicationOriginLock, LW_EXCLUSIVE);
1168 
1169  session_replication_state->acquired_by = 0;
1170  cv = &session_replication_state->origin_cv;
1171  session_replication_state = NULL;
1172 
1173  LWLockRelease(ReplicationOriginLock);
1174 
1176 }
1177 
1178 /*
1179  * Do the same work replorigin_advance() does, just on the session's
1180  * configured origin.
1181  *
1182  * This is noticeably cheaper than using replorigin_advance().
1183  */
1184 void
1186 {
1187  Assert(session_replication_state != NULL);
1188  Assert(session_replication_state->roident != InvalidRepOriginId);
1189 
1190  LWLockAcquire(&session_replication_state->lock, LW_EXCLUSIVE);
1191  if (session_replication_state->local_lsn < local_commit)
1192  session_replication_state->local_lsn = local_commit;
1193  if (session_replication_state->remote_lsn < remote_commit)
1194  session_replication_state->remote_lsn = remote_commit;
1195  LWLockRelease(&session_replication_state->lock);
1196 }
1197 
1198 /*
1199  * Ask the machinery about the point up to which we successfully replayed
1200  * changes from an already setup replication origin.
1201  */
1202 XLogRecPtr
1204 {
1207 
1208  Assert(session_replication_state != NULL);
1209 
1210  LWLockAcquire(&session_replication_state->lock, LW_SHARED);
1211  remote_lsn = session_replication_state->remote_lsn;
1212  local_lsn = session_replication_state->local_lsn;
1213  LWLockRelease(&session_replication_state->lock);
1214 
1215  if (flush && local_lsn != InvalidXLogRecPtr)
1216  XLogFlush(local_lsn);
1217 
1218  return remote_lsn;
1219 }
1220 
1221 
1222 
1223 /* ---------------------------------------------------------------------------
1224  * SQL functions for working with replication origin.
1225  *
1226  * These mostly should be fairly short wrappers around more generic functions.
1227  * ---------------------------------------------------------------------------
1228  */
1229 
1230 /*
1231  * Create replication origin for the passed in name, and return the assigned
1232  * oid.
1233  */
1234 Datum
1236 {
1237  char *name;
1239 
1240  replorigin_check_prerequisites(false, false);
1241 
1243 
1244  /* Replication origins "pg_xxx" are reserved for internal use */
1245  if (IsReservedName(name))
1246  ereport(ERROR,
1247  (errcode(ERRCODE_RESERVED_NAME),
1248  errmsg("replication origin name \"%s\" is reserved",
1249  name),
1250  errdetail("Origin names starting with \"pg_\" are reserved.")));
1251 
1252  /*
1253  * If built with appropriate switch, whine when regression-testing
1254  * conventions for replication origin names are violated.
1255  */
1256 #ifdef ENFORCE_REGRESSION_TEST_NAME_RESTRICTIONS
1257  if (strncmp(name, "regress_", 8) != 0)
1258  elog(WARNING, "replication origins created by regression test cases should have names starting with \"regress_\"");
1259 #endif
1260 
1261  roident = replorigin_create(name);
1262 
1263  pfree(name);
1264 
1265  PG_RETURN_OID(roident);
1266 }
1267 
1268 /*
1269  * Drop replication origin.
1270  */
1271 Datum
1273 {
1274  char *name;
1275 
1276  replorigin_check_prerequisites(false, false);
1277 
1279 
1280  replorigin_drop_by_name(name, false, true);
1281 
1282  pfree(name);
1283 
1284  PG_RETURN_VOID();
1285 }
1286 
1287 /*
1288  * Return oid of a replication origin.
1289  */
1290 Datum
1292 {
1293  char *name;
1295 
1296  replorigin_check_prerequisites(false, false);
1297 
1299  roident = replorigin_by_name(name, true);
1300 
1301  pfree(name);
1302 
1303  if (OidIsValid(roident))
1304  PG_RETURN_OID(roident);
1305  PG_RETURN_NULL();
1306 }
1307 
1308 /*
1309  * Setup a replication origin for this session.
1310  */
1311 Datum
1313 {
1314  char *name;
1315  RepOriginId origin;
1316 
1317  replorigin_check_prerequisites(true, false);
1318 
1320  origin = replorigin_by_name(name, false);
1321  replorigin_session_setup(origin);
1322 
1323  replorigin_session_origin = origin;
1324 
1325  pfree(name);
1326 
1327  PG_RETURN_VOID();
1328 }
1329 
1330 /*
1331  * Reset previously setup origin in this session
1332  */
1333 Datum
1335 {
1336  replorigin_check_prerequisites(true, false);
1337 
1339 
1343 
1344  PG_RETURN_VOID();
1345 }
1346 
1347 /*
1348  * Has a replication origin been setup for this session.
1349  */
1350 Datum
1352 {
1353  replorigin_check_prerequisites(false, false);
1354 
1356 }
1357 
1358 
1359 /*
1360  * Return the replication progress for origin setup in the current session.
1361  *
1362  * If 'flush' is set to true it is ensured that the returned value corresponds
1363  * to a local transaction that has been flushed. This is useful if asynchronous
1364  * commits are used when replaying replicated transactions.
1365  */
1366 Datum
1368 {
1370  bool flush = PG_GETARG_BOOL(0);
1371 
1372  replorigin_check_prerequisites(true, false);
1373 
1374  if (session_replication_state == NULL)
1375  ereport(ERROR,
1376  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1377  errmsg("no replication origin is configured")));
1378 
1379  remote_lsn = replorigin_session_get_progress(flush);
1380 
1381  if (remote_lsn == InvalidXLogRecPtr)
1382  PG_RETURN_NULL();
1383 
1384  PG_RETURN_LSN(remote_lsn);
1385 }
1386 
1387 Datum
1389 {
1390  XLogRecPtr location = PG_GETARG_LSN(0);
1391 
1392  replorigin_check_prerequisites(true, false);
1393 
1394  if (session_replication_state == NULL)
1395  ereport(ERROR,
1396  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1397  errmsg("no replication origin is configured")));
1398 
1399  replorigin_session_origin_lsn = location;
1401 
1402  PG_RETURN_VOID();
1403 }
1404 
1405 Datum
1407 {
1408  replorigin_check_prerequisites(true, false);
1409 
1412 
1413  PG_RETURN_VOID();
1414 }
1415 
1416 
1417 Datum
1419 {
1420  text *name = PG_GETARG_TEXT_PP(0);
1421  XLogRecPtr remote_commit = PG_GETARG_LSN(1);
1422  RepOriginId node;
1423 
1424  replorigin_check_prerequisites(true, false);
1425 
1426  /* lock to prevent the replication origin from vanishing */
1427  LockRelationOid(ReplicationOriginRelationId, RowExclusiveLock);
1428 
1429  node = replorigin_by_name(text_to_cstring(name), false);
1430 
1431  /*
1432  * Can't sensibly pass a local commit to be flushed at checkpoint - this
1433  * xact hasn't committed yet. This is why this function should be used to
1434  * set up the initial replication state, but not for replay.
1435  */
1436  replorigin_advance(node, remote_commit, InvalidXLogRecPtr,
1437  true /* go backward */ , true /* WAL log */ );
1438 
1439  UnlockRelationOid(ReplicationOriginRelationId, RowExclusiveLock);
1440 
1441  PG_RETURN_VOID();
1442 }
1443 
1444 
1445 /*
1446  * Return the replication progress for an individual replication origin.
1447  *
1448  * If 'flush' is set to true it is ensured that the returned value corresponds
1449  * to a local transaction that has been flushed. This is useful if asynchronous
1450  * commits are used when replaying replicated transactions.
1451  */
1452 Datum
1454 {
1455  char *name;
1456  bool flush;
1459 
1460  replorigin_check_prerequisites(true, true);
1461 
1463  flush = PG_GETARG_BOOL(1);
1464 
1465  roident = replorigin_by_name(name, false);
1466  Assert(OidIsValid(roident));
1467 
1468  remote_lsn = replorigin_get_progress(roident, flush);
1469 
1470  if (remote_lsn == InvalidXLogRecPtr)
1471  PG_RETURN_NULL();
1472 
1473  PG_RETURN_LSN(remote_lsn);
1474 }
1475 
1476 
1477 Datum
1479 {
1480  ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
1481  TupleDesc tupdesc;
1482  Tuplestorestate *tupstore;
1483  MemoryContext per_query_ctx;
1484  MemoryContext oldcontext;
1485  int i;
1487 
1488  /* we want to return 0 rows if slot is set to zero */
1489  replorigin_check_prerequisites(false, true);
1490 
1491  if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
1492  ereport(ERROR,
1493  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1494  errmsg("set-valued function called in context that cannot accept a set")));
1495  if (!(rsinfo->allowedModes & SFRM_Materialize))
1496  ereport(ERROR,
1497  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1498  errmsg("materialize mode required, but it is not allowed in this context")));
1499  if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
1500  elog(ERROR, "return type must be a row type");
1501 
1502  if (tupdesc->natts != REPLICATION_ORIGIN_PROGRESS_COLS)
1503  elog(ERROR, "wrong function definition");
1504 
1505  per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
1506  oldcontext = MemoryContextSwitchTo(per_query_ctx);
1507 
1508  tupstore = tuplestore_begin_heap(true, false, work_mem);
1509  rsinfo->returnMode = SFRM_Materialize;
1510  rsinfo->setResult = tupstore;
1511  rsinfo->setDesc = tupdesc;
1512 
1513  MemoryContextSwitchTo(oldcontext);
1514 
1515 
1516  /* prevent slots from being concurrently dropped */
1517  LWLockAcquire(ReplicationOriginLock, LW_SHARED);
1518 
1519  /*
1520  * Iterate through all possible replication_states, display if they are
1521  * filled. Note that we do not take any locks, so slightly corrupted/out
1522  * of date values are a possibility.
1523  */
1524  for (i = 0; i < max_replication_slots; i++)
1525  {
1529  char *roname;
1530 
1531  state = &replication_states[i];
1532 
1533  /* unused slot, nothing to display */
1534  if (state->roident == InvalidRepOriginId)
1535  continue;
1536 
1537  memset(values, 0, sizeof(values));
1538  memset(nulls, 1, sizeof(nulls));
1539 
1540  values[0] = ObjectIdGetDatum(state->roident);
1541  nulls[0] = false;
1542 
1543  /*
1544  * We're not preventing the origin to be dropped concurrently, so
1545  * silently accept that it might be gone.
1546  */
1547  if (replorigin_by_oid(state->roident, true,
1548  &roname))
1549  {
1550  values[1] = CStringGetTextDatum(roname);
1551  nulls[1] = false;
1552  }
1553 
1554  LWLockAcquire(&state->lock, LW_SHARED);
1555 
1556  values[2] = LSNGetDatum(state->remote_lsn);
1557  nulls[2] = false;
1558 
1559  values[3] = LSNGetDatum(state->local_lsn);
1560  nulls[3] = false;
1561 
1562  LWLockRelease(&state->lock);
1563 
1564  tuplestore_putvalues(tupstore, tupdesc, values, nulls);
1565  }
1566 
1567  tuplestore_donestoring(tupstore);
1568 
1569  LWLockRelease(ReplicationOriginLock);
1570 
1571 #undef REPLICATION_ORIGIN_PROGRESS_COLS
1572 
1573  return (Datum) 0;
1574 }
static ReplicationState * session_replication_state
Definition: origin.c:177
void tuplestore_putvalues(Tuplestorestate *state, TupleDesc tdesc, Datum *values, bool *isnull)
Definition: tuplestore.c:750
#define INIT_CRC32C(crc)
Definition: pg_crc32c.h:41
static void replorigin_check_prerequisites(bool check_slots, bool recoveryOK)
Definition: origin.c:183
Definition: lwlock.h:31
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28
#define IsA(nodeptr, _type_)
Definition: nodes.h:584
#define InitDirtySnapshot(snapshotdata)
Definition: snapmgr.h:75
TypeFuncClass get_call_result_type(FunctionCallInfo fcinfo, Oid *resultTypeId, TupleDesc *resultTupleDesc)
Definition: funcapi.c:207
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:167
int MyProcPid
Definition: globals.c:41
int errhint(const char *fmt,...)
Definition: elog.c:1152
XLogRecPtr local_lsn
Definition: origin.c:117
void systable_endscan(SysScanDesc sysscan)
Definition: genam.c:595
#define GETSTRUCT(TUP)
Definition: htup_details.h:655
#define RelationGetDescr(relation)
Definition: rel.h:483
#define DoNotReplicateId
Definition: origin.h:34
Datum pg_replication_origin_xact_setup(PG_FUNCTION_ARGS)
Definition: origin.c:1388
void UnlockRelationOid(Oid relid, LOCKMODE lockmode)
Definition: lmgr.c:199
#define write(a, b, c)
Definition: win32.h:14
Datum pg_replication_origin_drop(PG_FUNCTION_ARGS)
Definition: origin.c:1272
#define ExclusiveLock
Definition: lockdefs.h:44
int64 TimestampTz
Definition: timestamp.h:39
XLogRecPtr remote_lsn
Definition: origin.c:141
#define PG_GETARG_DATUM(n)
Definition: fmgr.h:268
void replorigin_drop_by_name(char *name, bool missing_ok, bool nowait)
Definition: origin.c:414
uint32 pg_crc32c
Definition: pg_crc32c.h:38
static void ReplicationOriginExitCleanup(int code, Datum arg)
Definition: origin.c:1036
RepOriginId roident
Definition: origin.c:140
#define tuplestore_donestoring(state)
Definition: tuplestore.h:60
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
unsigned char uint8
Definition: c.h:439
uint16 RepOriginId
Definition: xlogdefs.h:65
#define FLEXIBLE_ARRAY_MEMBER
Definition: c.h:350
void ConditionVariableBroadcast(ConditionVariable *cv)
XLogRecPtr replorigin_session_get_progress(bool flush)
Definition: origin.c:1203
int errcode(int sqlerrcode)
Definition: elog.c:694
#define LSNGetDatum(X)
Definition: pg_lsn.h:22
#define MemSet(start, val, len)
Definition: c.h:1008
void CatalogTupleDelete(Relation heapRel, ItemPointer tid)
Definition: indexing.c:351
void ReplicationOriginShmemInit(void)
Definition: origin.c:510
void replorigin_advance(RepOriginId node, XLogRecPtr remote_commit, XLogRecPtr local_commit, bool go_backward, bool wal_log)
Definition: origin.c:872
HeapTuple heap_form_tuple(TupleDesc tupleDescriptor, Datum *values, bool *isnull)
Definition: heaptuple.c:1020
#define PG_GETARG_BOOL(n)
Definition: fmgr.h:274
void replorigin_session_setup(RepOriginId node)
Definition: origin.c:1068
bool replorigin_by_oid(RepOriginId roident, bool missing_ok, char **roname)
Definition: origin.c:449
#define ReplicationOriginIdentIndex
#define LOG
Definition: elog.h:26
void heap_freetuple(HeapTuple htup)
Definition: heaptuple.c:1338
unsigned int Oid
Definition: postgres_ext.h:31
bool RecoveryInProgress(void)
Definition: xlog.c:8132
bool IsReservedName(const char *name)
Definition: catalog.c:210
#define OidIsValid(objectId)
Definition: c.h:710
#define PANIC
Definition: elog.h:55
void XLogFlush(XLogRecPtr record)
Definition: xlog.c:2850
static int fd(const char *x, int i)
Definition: preproc-init.c:105
SysScanDesc systable_beginscan(Relation heapRelation, Oid indexId, bool indexOK, Snapshot snapshot, int nkeys, ScanKey key)
Definition: genam.c:383
#define PG_BINARY
Definition: c.h:1271
RepOriginId replorigin_by_name(char *roname, bool missing_ok)
Definition: origin.c:209
RepOriginId roident
Definition: origin.c:105
XLogRecPtr EndRecPtr
Definition: xlogreader.h:176
#define PG_GETARG_TEXT_PP(n)
Definition: fmgr.h:309
Datum pg_replication_origin_advance(PG_FUNCTION_ARGS)
Definition: origin.c:1418
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1808
static void replorigin_drop_guts(Relation rel, RepOriginId roident, bool nowait)
Definition: origin.c:329
#define PG_RETURN_LSN(x)
Definition: pg_lsn.h:25
void CheckPointReplicationOrigin(void)
Definition: origin.c:557
void ConditionVariableInit(ConditionVariable *cv)
#define LSN_FORMAT_ARGS(lsn)
Definition: xlogdefs.h:43
void replorigin_redo(XLogReaderState *record)
Definition: origin.c:811
HeapTuple systable_getnext(SysScanDesc sysscan)
Definition: genam.c:502
void pfree(void *pointer)
Definition: mcxt.c:1057
#define XLogRecGetData(decoder)
Definition: xlogreader.h:310
void ConditionVariableCancelSleep(void)
#define ObjectIdGetDatum(X)
Definition: postgres.h:507
#define ERROR
Definition: elog.h:45
#define PG_UINT16_MAX
Definition: c.h:522
void replorigin_session_reset(void)
Definition: origin.c:1156
int OpenTransientFile(const char *fileName, int fileFlags)
Definition: fd.c:2404
FormData_pg_replication_origin * Form_pg_replication_origin
void * ShmemInitStruct(const char *name, Size size, bool *foundPtr)
Definition: shmem.c:396
LWLock lock
Definition: origin.c:132
ItemPointerData t_self
Definition: htup.h:65
#define DEBUG2
Definition: elog.h:24
XLogRecPtr replorigin_session_origin_lsn
Definition: origin.c:155
void on_shmem_exit(pg_on_exit_callback function, Datum arg)
Definition: ipc.c:361
#define NoLock
Definition: lockdefs.h:34
TimestampTz replorigin_session_origin_timestamp
Definition: origin.c:156
#define XLOG_REPLORIGIN_SET
Definition: origin.h:30
void StartupReplicationOrigin(void)
Definition: origin.c:683
#define RowExclusiveLock
Definition: lockdefs.h:38
int errdetail(const char *fmt,...)
Definition: elog.c:1038
int errcode_for_file_access(void)
Definition: elog.c:717
struct ReplicationState ReplicationState
unsigned int uint32
Definition: c.h:441
Datum pg_replication_origin_session_setup(PG_FUNCTION_ARGS)
Definition: origin.c:1312
Datum pg_replication_origin_session_reset(PG_FUNCTION_ARGS)
Definition: origin.c:1334
RepOriginId replorigin_create(char *roname)
Definition: origin.c:240
Datum pg_show_replication_origin_status(PG_FUNCTION_ARGS)
Definition: origin.c:1478
#define XLogRecGetInfo(decoder)
Definition: xlogreader.h:305
int durable_rename(const char *oldfile, const char *newfile, int elevel)
Definition: fd.c:687
Datum pg_replication_origin_session_is_setup(PG_FUNCTION_ARGS)
Definition: origin.c:1351
#define ERRCODE_DATA_CORRUPTED
Definition: pg_basebackup.c:45
void LWLockInitialize(LWLock *lock, int tranche_id)
Definition: lwlock.c:743
int CloseTransientFile(int fd)
Definition: fd.c:2581
#define WARNING
Definition: elog.h:40
HeapTuple SearchSysCache1(int cacheId, Datum key1)
Definition: syscache.c:1127
void XLogRegisterData(char *data, int len)
Definition: xloginsert.c:330
Tuplestorestate * tuplestore_begin_heap(bool randomAccess, bool interXact, int maxKBytes)
Definition: tuplestore.c:318
XLogRecPtr XLogInsert(RmgrId rmid, uint8 info)
Definition: xloginsert.c:422
#define XLOG_REPLORIGIN_DROP
Definition: origin.h:31
Size mul_size(Size s1, Size s2)
Definition: shmem.c:519
#define PG_GETARG_LSN(n)
Definition: pg_lsn.h:24
struct ReplicationStateOnDisk ReplicationStateOnDisk
#define PG_RETURN_BOOL(x)
Definition: fmgr.h:359
uintptr_t Datum
Definition: postgres.h:367
void CommandCounterIncrement(void)
Definition: xact.c:1021
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1175
Size add_size(Size s1, Size s2)
Definition: shmem.c:502
int work_mem
Definition: globals.c:122
Size ReplicationOriginShmemSize(void)
Definition: origin.c:490
#define REPLICATION_STATE_MAGIC
Definition: origin.c:180
#define InvalidOid
Definition: postgres_ext.h:36
#define ereport(elevel,...)
Definition: elog.h:155
static ReplicationStateCtl * replication_states_ctl
Definition: origin.c:170
Datum pg_replication_origin_xact_reset(PG_FUNCTION_ARGS)
Definition: origin.c:1406
int allowedModes
Definition: execnodes.h:304
#define PG_RETURN_VOID()
Definition: fmgr.h:349
struct ReplicationStateCtl ReplicationStateCtl
SetFunctionReturnMode returnMode
Definition: execnodes.h:306
int max_replication_slots
Definition: slot.c:99
void ConditionVariableSleep(ConditionVariable *cv, uint32 wait_event_info)
XLogRecPtr remote_lsn
Definition: origin.c:110
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
Datum pg_replication_origin_progress(PG_FUNCTION_ARGS)
Definition: origin.c:1453
RepOriginId node_id
Definition: origin.h:27
uint64 XLogRecPtr
Definition: xlogdefs.h:21
ReplicationState states[FLEXIBLE_ARRAY_MEMBER]
Definition: origin.c:150
#define Assert(condition)
Definition: c.h:804
#define XLR_INFO_MASK
Definition: xlogrecord.h:62
RepOriginId replorigin_session_origin
Definition: origin.c:154
Definition: regguts.h:317
RepOriginId node_id
Definition: origin.h:21
ConditionVariable origin_cv
Definition: origin.c:127
size_t Size
Definition: c.h:540
void replorigin_session_advance(XLogRecPtr remote_commit, XLogRecPtr local_commit)
Definition: origin.c:1185
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1206
bool IsTransactionState(void)
Definition: xact.c:371
XLogRecPtr remote_lsn
Definition: origin.h:20
MemoryContext ecxt_per_query_memory
Definition: execnodes.h:232
const char * name
Definition: encode.c:515
#define InvalidRepOriginId
Definition: origin.h:33
Tuplestorestate * setResult
Definition: execnodes.h:309
#define DatumGetPointer(X)
Definition: postgres.h:549
static Datum values[MAXATTR]
Definition: bootstrap.c:165
char * text_to_cstring(const text *t)
Definition: varlena.c:222
ExprContext * econtext
Definition: execnodes.h:302
TupleDesc setDesc
Definition: execnodes.h:310
int errmsg(const char *fmt,...)
Definition: elog.c:905
Datum pg_replication_origin_oid(PG_FUNCTION_ARGS)
Definition: origin.c:1291
#define PG_GETARG_TIMESTAMPTZ(n)
Definition: timestamp.h:36
#define elog(elevel,...)
Definition: elog.h:227
int i
Datum pg_replication_origin_session_progress(PG_FUNCTION_ARGS)
Definition: origin.c:1367
static ReplicationState * replication_states
Definition: origin.c:165
void ScanKeyInit(ScanKey entry, AttrNumber attributeNumber, StrategyNumber strategy, RegProcedure procedure, Datum argument)
Definition: scankey.c:76
#define CStringGetTextDatum(s)
Definition: builtins.h:82
void * arg
Definition: c.h:621
#define PG_FUNCTION_ARGS
Definition: fmgr.h:193
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:100
void LockRelationOid(Oid relid, LOCKMODE lockmode)
Definition: lmgr.c:108
#define COMP_CRC32C(crc, data, len)
Definition: pg_crc32c.h:89
Datum pg_replication_origin_create(PG_FUNCTION_ARGS)
Definition: origin.c:1235
#define REPLICATION_ORIGIN_PROGRESS_COLS
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39
void XLogBeginInsert(void)
Definition: xloginsert.c:123
#define PG_RETURN_OID(x)
Definition: fmgr.h:360
#define FIN_CRC32C(crc)
Definition: pg_crc32c.h:94
XLogRecPtr replorigin_get_progress(RepOriginId node, bool flush)
Definition: origin.c:995
void CatalogTupleInsert(Relation heapRel, HeapTuple tup)
Definition: indexing.c:222
#define PG_RETURN_NULL()
Definition: fmgr.h:345
#define read(a, b, c)
Definition: win32.h:13
#define BTEqualStrategyNumber
Definition: stratnum.h:31
#define offsetof(type, field)
Definition: c.h:727