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origin.h File Reference
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Data Structures

struct  xl_replorigin_set
 
struct  xl_replorigin_drop
 

Macros

#define XLOG_REPLORIGIN_SET   0x00
 
#define XLOG_REPLORIGIN_DROP   0x10
 
#define InvalidRepOriginId   0
 
#define DoNotReplicateId   PG_UINT16_MAX
 

Typedefs

typedef struct xl_replorigin_set xl_replorigin_set
 
typedef struct xl_replorigin_drop xl_replorigin_drop
 

Functions

RepOriginId replorigin_by_name (const char *name, bool missing_ok)
 
RepOriginId replorigin_create (const char *name)
 
void replorigin_drop_by_name (const char *name, bool missing_ok, bool nowait)
 
bool replorigin_by_oid (RepOriginId roident, bool missing_ok, char **roname)
 
void replorigin_advance (RepOriginId node, XLogRecPtr remote_commit, XLogRecPtr local_commit, bool go_backward, bool wal_log)
 
XLogRecPtr replorigin_get_progress (RepOriginId node, bool flush)
 
void replorigin_session_advance (XLogRecPtr remote_commit, XLogRecPtr local_commit)
 
void replorigin_session_setup (RepOriginId node)
 
void replorigin_session_reset (void)
 
XLogRecPtr replorigin_session_get_progress (bool flush)
 
void CheckPointReplicationOrigin (void)
 
void StartupReplicationOrigin (void)
 
void replorigin_redo (XLogReaderState *record)
 
void replorigin_desc (StringInfo buf, XLogReaderState *record)
 
const char * replorigin_identify (uint8 info)
 
Size ReplicationOriginShmemSize (void)
 
void ReplicationOriginShmemInit (void)
 

Variables

PGDLLIMPORT RepOriginId replorigin_session_origin
 
PGDLLIMPORT XLogRecPtr replorigin_session_origin_lsn
 
PGDLLIMPORT TimestampTz replorigin_session_origin_timestamp
 

Macro Definition Documentation

◆ DoNotReplicateId

◆ InvalidRepOriginId

◆ XLOG_REPLORIGIN_DROP

#define XLOG_REPLORIGIN_DROP   0x10

◆ XLOG_REPLORIGIN_SET

#define XLOG_REPLORIGIN_SET   0x00

Definition at line 30 of file origin.h.

Referenced by replorigin_advance(), replorigin_desc(), replorigin_identify(), and replorigin_redo().

Typedef Documentation

◆ xl_replorigin_drop

◆ xl_replorigin_set

Function Documentation

◆ CheckPointReplicationOrigin()

void CheckPointReplicationOrigin ( void  )

Definition at line 557 of file origin.c.

References CloseTransientFile(), COMP_CRC32C, durable_rename(), ereport, errcode_for_file_access(), errmsg(), FIN_CRC32C, i, INIT_CRC32C, InvalidRepOriginId, ReplicationState::local_lsn, ReplicationState::lock, LW_SHARED, LWLockAcquire(), LWLockRelease(), max_replication_slots, OpenTransientFile(), PANIC, PG_BINARY, ReplicationState::remote_lsn, ReplicationStateOnDisk::remote_lsn, REPLICATION_STATE_MAGIC, ReplicationState::roident, ReplicationStateOnDisk::roident, write, and XLogFlush().

Referenced by CheckPointGuts().

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 checkpoint
580  * 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];
612  XLogRecPtr local_lsn;
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 }
#define INIT_CRC32C(crc)
Definition: pg_crc32c.h:41
XLogRecPtr local_lsn
Definition: origin.c:117
#define write(a, b, c)
Definition: win32.h:14
XLogRecPtr remote_lsn
Definition: origin.c:141
uint32 pg_crc32c
Definition: pg_crc32c.h:38
RepOriginId roident
Definition: origin.c:140
#define PANIC
Definition: elog.h:50
void XLogFlush(XLogRecPtr record)
Definition: xlog.c:2860
#define PG_BINARY
Definition: c.h:1271
RepOriginId roident
Definition: origin.c:105
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1803
int OpenTransientFile(const char *fileName, int fileFlags)
Definition: fd.c:2509
LWLock lock
Definition: origin.c:132
int magic
Definition: regguts.h:529
int errcode_for_file_access(void)
Definition: elog.c:721
unsigned int uint32
Definition: c.h:441
int durable_rename(const char *oldfile, const char *newfile, int elevel)
Definition: fd.c:697
int CloseTransientFile(int fd)
Definition: fd.c:2686
#define REPLICATION_STATE_MAGIC
Definition: origin.c:180
#define ereport(elevel,...)
Definition: elog.h:157
int max_replication_slots
Definition: slot.c:99
XLogRecPtr remote_lsn
Definition: origin.c:110
uint64 XLogRecPtr
Definition: xlogdefs.h:21
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1199
#define InvalidRepOriginId
Definition: origin.h:33
int errmsg(const char *fmt,...)
Definition: elog.c:909
int i
static ReplicationState * replication_states
Definition: origin.c:165
#define COMP_CRC32C(crc, data, len)
Definition: pg_crc32c.h:89
#define FIN_CRC32C(crc)
Definition: pg_crc32c.h:94

◆ ReplicationOriginShmemInit()

void ReplicationOriginShmemInit ( void  )

Definition at line 510 of file origin.c.

References ConditionVariableInit(), i, ReplicationState::lock, LWLockInitialize(), LWTRANCHE_REPLICATION_ORIGIN_STATE, max_replication_slots, MemSet, ReplicationState::origin_cv, ReplicationOriginShmemSize(), ShmemInitStruct(), ReplicationStateCtl::states, and ReplicationStateCtl::tranche_id.

Referenced by CreateSharedMemoryAndSemaphores().

511 {
512  bool found;
513 
514  if (max_replication_slots == 0)
515  return;
516 
518  ShmemInitStruct("ReplicationOriginState",
520  &found);
522 
523  if (!found)
524  {
525  int i;
526 
528 
530 
531  for (i = 0; i < max_replication_slots; i++)
532  {
536  }
537  }
538 }
#define MemSet(start, val, len)
Definition: c.h:1008
void ConditionVariableInit(ConditionVariable *cv)
void * ShmemInitStruct(const char *name, Size size, bool *foundPtr)
Definition: shmem.c:396
void LWLockInitialize(LWLock *lock, int tranche_id)
Definition: lwlock.c:736
Size ReplicationOriginShmemSize(void)
Definition: origin.c:490
static ReplicationStateCtl * replication_states_ctl
Definition: origin.c:170
int max_replication_slots
Definition: slot.c:99
ReplicationState states[FLEXIBLE_ARRAY_MEMBER]
Definition: origin.c:150
int i
static ReplicationState * replication_states
Definition: origin.c:165

◆ ReplicationOriginShmemSize()

Size ReplicationOriginShmemSize ( void  )

Definition at line 490 of file origin.c.

References add_size(), max_replication_slots, mul_size(), and offsetof.

Referenced by CalculateShmemSize(), and ReplicationOriginShmemInit().

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 }
Size mul_size(Size s1, Size s2)
Definition: shmem.c:519
Size add_size(Size s1, Size s2)
Definition: shmem.c:502
int max_replication_slots
Definition: slot.c:99
size_t Size
Definition: c.h:540
#define offsetof(type, field)
Definition: c.h:727

◆ replorigin_advance()

void replorigin_advance ( RepOriginId  node,
XLogRecPtr  remote_commit,
XLogRecPtr  local_commit,
bool  go_backward,
bool  wal_log 
)

Definition at line 872 of file origin.c.

References ReplicationState::acquired_by, Assert, DoNotReplicateId, ereport, errcode(), errhint(), errmsg(), ERROR, xl_replorigin_set::force, i, InvalidRepOriginId, InvalidXLogRecPtr, ReplicationState::local_lsn, ReplicationState::lock, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), max_replication_slots, xl_replorigin_set::node_id, xl_replorigin_set::remote_lsn, ReplicationState::remote_lsn, ReplicationState::roident, XLOG_REPLORIGIN_SET, XLogBeginInsert(), XLogInsert(), and XLogRegisterData().

Referenced by LogicalRepSyncTableStart(), pg_replication_origin_advance(), PrepareRedoAdd(), replorigin_redo(), xact_redo_abort(), and xact_redo_commit().

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. We
977  * could also see older values for prepared transactions when the prepare
978  * is sent at a later point of time along with commit prepared and there
979  * are other transactions commits between prepare and commit prepared. See
980  * ReorderBufferFinishPrepared. Don't overwrite those.
981  */
982  if (go_backward || replication_state->remote_lsn < remote_commit)
983  replication_state->remote_lsn = remote_commit;
984  if (local_commit != InvalidXLogRecPtr &&
985  (go_backward || replication_state->local_lsn < local_commit))
986  replication_state->local_lsn = local_commit;
987  LWLockRelease(&replication_state->lock);
988 
989  /*
990  * Release *after* changing the LSNs, slot isn't acquired and thus could
991  * otherwise be dropped anytime.
992  */
993  LWLockRelease(ReplicationOriginLock);
994 }
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28
int errhint(const char *fmt,...)
Definition: elog.c:1156
XLogRecPtr local_lsn
Definition: origin.c:117
#define DoNotReplicateId
Definition: origin.h:34
int errcode(int sqlerrcode)
Definition: elog.c:698
RepOriginId roident
Definition: origin.c:105
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1803
#define ERROR
Definition: elog.h:46
LWLock lock
Definition: origin.c:132
#define XLOG_REPLORIGIN_SET
Definition: origin.h:30
void XLogRegisterData(char *data, int len)
Definition: xloginsert.c:340
XLogRecPtr XLogInsert(RmgrId rmid, uint8 info)
Definition: xloginsert.c:434
#define ereport(elevel,...)
Definition: elog.h:157
int max_replication_slots
Definition: slot.c:99
XLogRecPtr remote_lsn
Definition: origin.c:110
#define Assert(condition)
Definition: c.h:804
RepOriginId node_id
Definition: origin.h:21
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1199
XLogRecPtr remote_lsn
Definition: origin.h:20
#define InvalidRepOriginId
Definition: origin.h:33
int errmsg(const char *fmt,...)
Definition: elog.c:909
int i
static ReplicationState * replication_states
Definition: origin.c:165
void XLogBeginInsert(void)
Definition: xloginsert.c:135

◆ replorigin_by_name()

RepOriginId replorigin_by_name ( const char *  name,
bool  missing_ok 
)

Definition at line 209 of file origin.c.

References CStringGetTextDatum, ereport, errcode(), errmsg(), ERROR, GETSTRUCT, HeapTupleIsValid, InvalidOid, ReleaseSysCache(), REPLORIGNAME, ReplicationState::roident, and SearchSysCache1().

Referenced by ApplyWorkerMain(), LogicalRepSyncTableStart(), pg_replication_origin_advance(), pg_replication_origin_oid(), pg_replication_origin_progress(), pg_replication_origin_session_setup(), and replorigin_drop_by_name().

210 {
212  Oid roident = InvalidOid;
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 }
#define GETSTRUCT(TUP)
Definition: htup_details.h:654
int errcode(int sqlerrcode)
Definition: elog.c:698
unsigned int Oid
Definition: postgres_ext.h:31
#define ERROR
Definition: elog.h:46
FormData_pg_replication_origin * Form_pg_replication_origin
HeapTuple SearchSysCache1(int cacheId, Datum key1)
Definition: syscache.c:1127
uintptr_t Datum
Definition: postgres.h:411
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1175
#define InvalidOid
Definition: postgres_ext.h:36
#define ereport(elevel,...)
Definition: elog.h:157
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
int errmsg(const char *fmt,...)
Definition: elog.c:909
#define CStringGetTextDatum(s)
Definition: builtins.h:86

◆ replorigin_by_oid()

bool replorigin_by_oid ( RepOriginId  roident,
bool  missing_ok,
char **  roname 
)

Definition at line 449 of file origin.c.

References Assert, DoNotReplicateId, ereport, errcode(), errmsg(), ERROR, GETSTRUCT, HeapTupleIsValid, InvalidRepOriginId, ObjectIdGetDatum, OidIsValid, ReleaseSysCache(), REPLORIGIDENT, SearchSysCache1(), and text_to_cstring().

Referenced by pg_show_replication_origin_status(), and send_repl_origin().

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 }
#define GETSTRUCT(TUP)
Definition: htup_details.h:654
#define DoNotReplicateId
Definition: origin.h:34
int errcode(int sqlerrcode)
Definition: elog.c:698
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:710
#define ObjectIdGetDatum(X)
Definition: postgres.h:551
#define ERROR
Definition: elog.h:46
FormData_pg_replication_origin * Form_pg_replication_origin
HeapTuple SearchSysCache1(int cacheId, Datum key1)
Definition: syscache.c:1127
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1175
#define ereport(elevel,...)
Definition: elog.h:157
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define Assert(condition)
Definition: c.h:804
#define InvalidRepOriginId
Definition: origin.h:33
char * text_to_cstring(const text *t)
Definition: varlena.c:222
int errmsg(const char *fmt,...)
Definition: elog.c:909

◆ replorigin_create()

RepOriginId replorigin_create ( const char *  name)

Definition at line 240 of file origin.c.

References Assert, BTEqualStrategyNumber, CatalogTupleInsert(), CHECK_FOR_INTERRUPTS, CommandCounterIncrement(), CStringGetTextDatum, ereport, errcode(), errmsg(), ERROR, ExclusiveLock, heap_form_tuple(), heap_freetuple(), HeapTupleIsValid, InitDirtySnapshot, InvalidOid, IsTransactionState(), sort-test::key, ObjectIdGetDatum, PG_UINT16_MAX, RelationGetDescr, ReplicationState::roident, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), table_open(), and values.

Referenced by ApplyWorkerMain(), CreateSubscription(), LogicalRepSyncTableStart(), and pg_replication_origin_create().

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 
286  scan = systable_beginscan(rel, ReplicationOriginIdentIndex,
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 }
#define InitDirtySnapshot(snapshotdata)
Definition: snapmgr.h:74
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:167
void systable_endscan(SysScanDesc sysscan)
Definition: genam.c:595
#define RelationGetDescr(relation)
Definition: rel.h:503
#define ExclusiveLock
Definition: lockdefs.h:44
int errcode(int sqlerrcode)
Definition: elog.c:698
HeapTuple heap_form_tuple(TupleDesc tupleDescriptor, Datum *values, bool *isnull)
Definition: heaptuple.c:1020
void heap_freetuple(HeapTuple htup)
Definition: heaptuple.c:1338
unsigned int Oid
Definition: postgres_ext.h:31
SysScanDesc systable_beginscan(Relation heapRelation, Oid indexId, bool indexOK, Snapshot snapshot, int nkeys, ScanKey key)
Definition: genam.c:383
HeapTuple systable_getnext(SysScanDesc sysscan)
Definition: genam.c:502
#define ObjectIdGetDatum(X)
Definition: postgres.h:551
#define ERROR
Definition: elog.h:46
#define PG_UINT16_MAX
Definition: c.h:522
uintptr_t Datum
Definition: postgres.h:411
void CommandCounterIncrement(void)
Definition: xact.c:1021
#define InvalidOid
Definition: postgres_ext.h:36
#define ereport(elevel,...)
Definition: elog.h:157
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define Assert(condition)
Definition: c.h:804
bool IsTransactionState(void)
Definition: xact.c:371
static Datum values[MAXATTR]
Definition: bootstrap.c:156
int errmsg(const char *fmt,...)
Definition: elog.c:909
void ScanKeyInit(ScanKey entry, AttrNumber attributeNumber, StrategyNumber strategy, RegProcedure procedure, Datum argument)
Definition: scankey.c:76
#define CStringGetTextDatum(s)
Definition: builtins.h:86
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:120
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39
void CatalogTupleInsert(Relation heapRel, HeapTuple tup)
Definition: indexing.c:221
#define BTEqualStrategyNumber
Definition: stratnum.h:31

◆ replorigin_desc()

void replorigin_desc ( StringInfo  buf,
XLogReaderState record 
)

Definition at line 19 of file replorigindesc.c.

References appendStringInfo(), xl_replorigin_set::force, LSN_FORMAT_ARGS, xl_replorigin_set::node_id, xl_replorigin_drop::node_id, xl_replorigin_set::remote_lsn, XLOG_REPLORIGIN_DROP, XLOG_REPLORIGIN_SET, XLogRecGetData, XLogRecGetInfo, and XLR_INFO_MASK.

20 {
21  char *rec = XLogRecGetData(record);
23 
24  switch (info)
25  {
27  {
28  xl_replorigin_set *xlrec;
29 
30  xlrec = (xl_replorigin_set *) rec;
31 
32  appendStringInfo(buf, "set %u; lsn %X/%X; force: %d",
33  xlrec->node_id,
35  xlrec->force);
36  break;
37  }
39  {
40  xl_replorigin_drop *xlrec;
41 
42  xlrec = (xl_replorigin_drop *) rec;
43 
44  appendStringInfo(buf, "drop %u", xlrec->node_id);
45  break;
46  }
47  }
48 }
unsigned char uint8
Definition: c.h:439
#define LSN_FORMAT_ARGS(lsn)
Definition: xlogdefs.h:43
#define XLogRecGetData(decoder)
Definition: xlogreader.h:310
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:91
#define XLOG_REPLORIGIN_SET
Definition: origin.h:30
#define XLogRecGetInfo(decoder)
Definition: xlogreader.h:305
#define XLOG_REPLORIGIN_DROP
Definition: origin.h:31
RepOriginId node_id
Definition: origin.h:27
#define XLR_INFO_MASK
Definition: xlogrecord.h:62
RepOriginId node_id
Definition: origin.h:21
XLogRecPtr remote_lsn
Definition: origin.h:20
long info
Definition: regguts.h:532

◆ replorigin_drop_by_name()

void replorigin_drop_by_name ( const char *  name,
bool  missing_ok,
bool  nowait 
)

Definition at line 414 of file origin.c.

References Assert, ExclusiveLock, IsTransactionState(), NoLock, OidIsValid, replorigin_by_name(), replorigin_drop_guts(), ReplicationState::roident, table_close(), and table_open().

Referenced by AlterSubscription_refresh(), DropSubscription(), pg_replication_origin_drop(), and process_syncing_tables_for_apply().

415 {
416  RepOriginId roident;
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 }
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:167
#define ExclusiveLock
Definition: lockdefs.h:44
RepOriginId replorigin_by_name(const char *roname, bool missing_ok)
Definition: origin.c:209
uint16 RepOriginId
Definition: xlogdefs.h:65
#define OidIsValid(objectId)
Definition: c.h:710
static void replorigin_drop_guts(Relation rel, RepOriginId roident, bool nowait)
Definition: origin.c:329
#define NoLock
Definition: lockdefs.h:34
#define Assert(condition)
Definition: c.h:804
bool IsTransactionState(void)
Definition: xact.c:371
const char * name
Definition: encode.c:561
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39

◆ replorigin_get_progress()

XLogRecPtr replorigin_get_progress ( RepOriginId  node,
bool  flush 
)

Definition at line 998 of file origin.c.

References i, InvalidXLogRecPtr, ReplicationState::local_lsn, ReplicationState::lock, LW_SHARED, LWLockAcquire(), LWLockRelease(), max_replication_slots, ReplicationState::remote_lsn, ReplicationState::roident, and XLogFlush().

Referenced by pg_replication_origin_progress().

999 {
1000  int i;
1001  XLogRecPtr local_lsn = InvalidXLogRecPtr;
1002  XLogRecPtr remote_lsn = InvalidXLogRecPtr;
1003 
1004  /* prevent slots from being concurrently dropped */
1005  LWLockAcquire(ReplicationOriginLock, LW_SHARED);
1006 
1007  for (i = 0; i < max_replication_slots; i++)
1008  {
1010 
1011  state = &replication_states[i];
1012 
1013  if (state->roident == node)
1014  {
1015  LWLockAcquire(&state->lock, LW_SHARED);
1016 
1017  remote_lsn = state->remote_lsn;
1018  local_lsn = state->local_lsn;
1019 
1020  LWLockRelease(&state->lock);
1021 
1022  break;
1023  }
1024  }
1025 
1026  LWLockRelease(ReplicationOriginLock);
1027 
1028  if (flush && local_lsn != InvalidXLogRecPtr)
1029  XLogFlush(local_lsn);
1030 
1031  return remote_lsn;
1032 }
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28
XLogRecPtr local_lsn
Definition: origin.c:117
void XLogFlush(XLogRecPtr record)
Definition: xlog.c:2860
RepOriginId roident
Definition: origin.c:105
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1803
LWLock lock
Definition: origin.c:132
int max_replication_slots
Definition: slot.c:99
XLogRecPtr remote_lsn
Definition: origin.c:110
uint64 XLogRecPtr
Definition: xlogdefs.h:21
Definition: regguts.h:317
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1199
int i
static ReplicationState * replication_states
Definition: origin.c:165

◆ replorigin_identify()

const char* replorigin_identify ( uint8  info)

Definition at line 51 of file replorigindesc.c.

References XLOG_REPLORIGIN_DROP, and XLOG_REPLORIGIN_SET.

52 {
53  switch (info)
54  {
56  return "SET";
58  return "DROP";
59  default:
60  return NULL;
61  }
62 }
#define XLOG_REPLORIGIN_SET
Definition: origin.h:30
#define XLOG_REPLORIGIN_DROP
Definition: origin.h:31
long info
Definition: regguts.h:532

◆ replorigin_redo()

void replorigin_redo ( XLogReaderState record)

Definition at line 811 of file origin.c.

References elog, XLogReaderState::EndRecPtr, xl_replorigin_set::force, i, InvalidRepOriginId, InvalidXLogRecPtr, ReplicationState::local_lsn, max_replication_slots, xl_replorigin_set::node_id, xl_replorigin_drop::node_id, PANIC, xl_replorigin_set::remote_lsn, ReplicationState::remote_lsn, replorigin_advance(), ReplicationState::roident, XLOG_REPLORIGIN_DROP, XLOG_REPLORIGIN_SET, XLogRecGetData, XLogRecGetInfo, and XLR_INFO_MASK.

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  {
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 }
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28
XLogRecPtr local_lsn
Definition: origin.c:117
unsigned char uint8
Definition: c.h:439
void replorigin_advance(RepOriginId node, XLogRecPtr remote_commit, XLogRecPtr local_commit, bool go_backward, bool wal_log)
Definition: origin.c:872
#define PANIC
Definition: elog.h:50
RepOriginId roident
Definition: origin.c:105
XLogRecPtr EndRecPtr
Definition: xlogreader.h:176
#define XLogRecGetData(decoder)
Definition: xlogreader.h:310
#define XLOG_REPLORIGIN_SET
Definition: origin.h:30
#define XLogRecGetInfo(decoder)
Definition: xlogreader.h:305
#define XLOG_REPLORIGIN_DROP
Definition: origin.h:31
int max_replication_slots
Definition: slot.c:99
XLogRecPtr remote_lsn
Definition: origin.c:110
RepOriginId node_id
Definition: origin.h:27
#define XLR_INFO_MASK
Definition: xlogrecord.h:62
Definition: regguts.h:317
RepOriginId node_id
Definition: origin.h:21
XLogRecPtr remote_lsn
Definition: origin.h:20
#define InvalidRepOriginId
Definition: origin.h:33
long info
Definition: regguts.h:532
#define elog(elevel,...)
Definition: elog.h:232
int i
static ReplicationState * replication_states
Definition: origin.c:165

◆ replorigin_session_advance()

void replorigin_session_advance ( XLogRecPtr  remote_commit,
XLogRecPtr  local_commit 
)

Definition at line 1188 of file origin.c.

References Assert, InvalidRepOriginId, ReplicationState::local_lsn, ReplicationState::lock, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), ReplicationState::remote_lsn, and ReplicationState::roident.

Referenced by EndPrepare(), RecordTransactionAbortPrepared(), RecordTransactionCommit(), and RecordTransactionCommitPrepared().

1189 {
1192 
1194  if (session_replication_state->local_lsn < local_commit)
1195  session_replication_state->local_lsn = local_commit;
1196  if (session_replication_state->remote_lsn < remote_commit)
1197  session_replication_state->remote_lsn = remote_commit;
1199 }
static ReplicationState * session_replication_state
Definition: origin.c:177
XLogRecPtr local_lsn
Definition: origin.c:117
RepOriginId roident
Definition: origin.c:105
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1803
LWLock lock
Definition: origin.c:132
XLogRecPtr remote_lsn
Definition: origin.c:110
#define Assert(condition)
Definition: c.h:804
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1199
#define InvalidRepOriginId
Definition: origin.h:33

◆ replorigin_session_get_progress()

XLogRecPtr replorigin_session_get_progress ( bool  flush)

Definition at line 1206 of file origin.c.

References Assert, InvalidXLogRecPtr, ReplicationState::local_lsn, ReplicationState::lock, LW_SHARED, LWLockAcquire(), LWLockRelease(), ReplicationState::remote_lsn, and XLogFlush().

Referenced by ApplyWorkerMain(), LogicalRepSyncTableStart(), and pg_replication_origin_session_progress().

1207 {
1208  XLogRecPtr remote_lsn;
1209  XLogRecPtr local_lsn;
1210 
1212 
1214  remote_lsn = session_replication_state->remote_lsn;
1215  local_lsn = session_replication_state->local_lsn;
1217 
1218  if (flush && local_lsn != InvalidXLogRecPtr)
1219  XLogFlush(local_lsn);
1220 
1221  return remote_lsn;
1222 }
static ReplicationState * session_replication_state
Definition: origin.c:177
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28
XLogRecPtr local_lsn
Definition: origin.c:117
void XLogFlush(XLogRecPtr record)
Definition: xlog.c:2860
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1803
LWLock lock
Definition: origin.c:132
XLogRecPtr remote_lsn
Definition: origin.c:110
uint64 XLogRecPtr
Definition: xlogdefs.h:21
#define Assert(condition)
Definition: c.h:804
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1199

◆ replorigin_session_reset()

void replorigin_session_reset ( void  )

Definition at line 1159 of file origin.c.

References ReplicationState::acquired_by, Assert, ConditionVariableBroadcast(), ereport, errcode(), errmsg(), ERROR, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), max_replication_slots, and ReplicationState::origin_cv.

Referenced by pg_replication_origin_session_reset().

1160 {
1161  ConditionVariable *cv;
1162 
1164 
1165  if (session_replication_state == NULL)
1166  ereport(ERROR,
1167  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1168  errmsg("no replication origin is configured")));
1169 
1170  LWLockAcquire(ReplicationOriginLock, LW_EXCLUSIVE);
1171 
1175 
1176  LWLockRelease(ReplicationOriginLock);
1177 
1179 }
static ReplicationState * session_replication_state
Definition: origin.c:177
void ConditionVariableBroadcast(ConditionVariable *cv)
int errcode(int sqlerrcode)
Definition: elog.c:698
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1803
#define ERROR
Definition: elog.h:46
#define ereport(elevel,...)
Definition: elog.h:157
int max_replication_slots
Definition: slot.c:99
#define Assert(condition)
Definition: c.h:804
ConditionVariable origin_cv
Definition: origin.c:127
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1199
int errmsg(const char *fmt,...)
Definition: elog.c:909

◆ replorigin_session_setup()

void replorigin_session_setup ( RepOriginId  node)

Definition at line 1071 of file origin.c.

References ReplicationState::acquired_by, Assert, ConditionVariableBroadcast(), ereport, errcode(), errhint(), errmsg(), ERROR, i, InvalidRepOriginId, InvalidXLogRecPtr, ReplicationState::local_lsn, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), max_replication_slots, MyProcPid, on_shmem_exit(), ReplicationState::origin_cv, ReplicationState::remote_lsn, ReplicationOriginExitCleanup(), and ReplicationState::roident.

Referenced by ApplyWorkerMain(), LogicalRepSyncTableStart(), and pg_replication_origin_session_setup().

1072 {
1073  static bool registered_cleanup;
1074  int i;
1075  int free_slot = -1;
1076 
1077  if (!registered_cleanup)
1078  {
1080  registered_cleanup = true;
1081  }
1082 
1084 
1085  if (session_replication_state != NULL)
1086  ereport(ERROR,
1087  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1088  errmsg("cannot setup replication origin when one is already setup")));
1089 
1090  /* Lock exclusively, as we may have to create a new table entry. */
1091  LWLockAcquire(ReplicationOriginLock, LW_EXCLUSIVE);
1092 
1093  /*
1094  * Search for either an existing slot for the origin, or a free one we can
1095  * use.
1096  */
1097  for (i = 0; i < max_replication_slots; i++)
1098  {
1099  ReplicationState *curstate = &replication_states[i];
1100 
1101  /* remember where to insert if necessary */
1102  if (curstate->roident == InvalidRepOriginId &&
1103  free_slot == -1)
1104  {
1105  free_slot = i;
1106  continue;
1107  }
1108 
1109  /* not our slot */
1110  if (curstate->roident != node)
1111  continue;
1112 
1113  else if (curstate->acquired_by != 0)
1114  {
1115  ereport(ERROR,
1116  (errcode(ERRCODE_OBJECT_IN_USE),
1117  errmsg("replication origin with OID %d is already active for PID %d",
1118  curstate->roident, curstate->acquired_by)));
1119  }
1120 
1121  /* ok, found slot */
1122  session_replication_state = curstate;
1123  }
1124 
1125 
1126  if (session_replication_state == NULL && free_slot == -1)
1127  ereport(ERROR,
1128  (errcode(ERRCODE_CONFIGURATION_LIMIT_EXCEEDED),
1129  errmsg("could not find free replication state slot for replication origin with OID %u",
1130  node),
1131  errhint("Increase max_replication_slots and try again.")));
1132  else if (session_replication_state == NULL)
1133  {
1134  /* initialize new slot */
1139  }
1140 
1141 
1143 
1145 
1146  LWLockRelease(ReplicationOriginLock);
1147 
1148  /* probably this one is pointless */
1150 }
static ReplicationState * session_replication_state
Definition: origin.c:177
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28
int MyProcPid
Definition: globals.c:43
int errhint(const char *fmt,...)
Definition: elog.c:1156
XLogRecPtr local_lsn
Definition: origin.c:117
static void ReplicationOriginExitCleanup(int code, Datum arg)
Definition: origin.c:1039
void ConditionVariableBroadcast(ConditionVariable *cv)
int errcode(int sqlerrcode)
Definition: elog.c:698
RepOriginId roident
Definition: origin.c:105
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1803
#define ERROR
Definition: elog.h:46
void on_shmem_exit(pg_on_exit_callback function, Datum arg)
Definition: ipc.c:361
#define ereport(elevel,...)
Definition: elog.h:157
int max_replication_slots
Definition: slot.c:99
XLogRecPtr remote_lsn
Definition: origin.c:110
#define Assert(condition)
Definition: c.h:804
ConditionVariable origin_cv
Definition: origin.c:127
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1199
#define InvalidRepOriginId
Definition: origin.h:33
int errmsg(const char *fmt,...)
Definition: elog.c:909
int i
static ReplicationState * replication_states
Definition: origin.c:165

◆ StartupReplicationOrigin()

void StartupReplicationOrigin ( void  )

Definition at line 683 of file origin.c.

References Assert, CloseTransientFile(), COMP_CRC32C, DEBUG2, elog, ereport, errcode(), ERRCODE_DATA_CORRUPTED, errcode_for_file_access(), errmsg(), fd(), FIN_CRC32C, INIT_CRC32C, LOG, LSN_FORMAT_ARGS, max_replication_slots, OpenTransientFile(), PANIC, PG_BINARY, read, ReplicationState::remote_lsn, ReplicationStateOnDisk::remote_lsn, REPLICATION_STATE_MAGIC, ReplicationState::roident, and ReplicationStateOnDisk::roident.

Referenced by StartupXLOG().

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,
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 }
#define INIT_CRC32C(crc)
Definition: pg_crc32c.h:41
XLogRecPtr remote_lsn
Definition: origin.c:141
uint32 pg_crc32c
Definition: pg_crc32c.h:38
RepOriginId roident
Definition: origin.c:140
int errcode(int sqlerrcode)
Definition: elog.c:698
#define LOG
Definition: elog.h:26
#define PANIC
Definition: elog.h:50
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define PG_BINARY
Definition: c.h:1271
RepOriginId roident
Definition: origin.c:105
#define LSN_FORMAT_ARGS(lsn)
Definition: xlogdefs.h:43
int OpenTransientFile(const char *fileName, int fileFlags)
Definition: fd.c:2509
int magic
Definition: regguts.h:529
#define DEBUG2
Definition: elog.h:24
int errcode_for_file_access(void)
Definition: elog.c:721
unsigned int uint32
Definition: c.h:441
#define ERRCODE_DATA_CORRUPTED
Definition: pg_basebackup.c:47
int CloseTransientFile(int fd)
Definition: fd.c:2686
#define REPLICATION_STATE_MAGIC
Definition: origin.c:180
#define ereport(elevel,...)
Definition: elog.h:157
int max_replication_slots
Definition: slot.c:99
XLogRecPtr remote_lsn
Definition: origin.c:110
#define Assert(condition)
Definition: c.h:804
int errmsg(const char *fmt,...)
Definition: elog.c:909
#define elog(elevel,...)
Definition: elog.h:232
static ReplicationState * replication_states
Definition: origin.c:165
#define COMP_CRC32C(crc, data, len)
Definition: pg_crc32c.h:89
#define FIN_CRC32C(crc)
Definition: pg_crc32c.h:94
#define read(a, b, c)
Definition: win32.h:13

Variable Documentation

◆ replorigin_session_origin

◆ replorigin_session_origin_lsn

◆ replorigin_session_origin_timestamp