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standby.h File Reference
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Data Structures

struct  RunningTransactionsData
 

Macros

#define MinSizeOfXactRunningXacts   offsetof(xl_running_xacts, xids)
 

Typedefs

typedef struct RunningTransactionsData RunningTransactionsData
 
typedef RunningTransactionsDataRunningTransactions
 

Functions

void InitRecoveryTransactionEnvironment (void)
 
void ShutdownRecoveryTransactionEnvironment (void)
 
void ResolveRecoveryConflictWithSnapshot (TransactionId snapshotConflictHorizon, bool isCatalogRel, RelFileLocator locator)
 
void ResolveRecoveryConflictWithSnapshotFullXid (FullTransactionId snapshotConflictHorizon, bool isCatalogRel, RelFileLocator locator)
 
void ResolveRecoveryConflictWithTablespace (Oid tsid)
 
void ResolveRecoveryConflictWithDatabase (Oid dbid)
 
void ResolveRecoveryConflictWithLock (LOCKTAG locktag, bool logging_conflict)
 
void ResolveRecoveryConflictWithBufferPin (void)
 
void CheckRecoveryConflictDeadlock (void)
 
void StandbyDeadLockHandler (void)
 
void StandbyTimeoutHandler (void)
 
void StandbyLockTimeoutHandler (void)
 
void LogRecoveryConflict (ProcSignalReason reason, TimestampTz wait_start, TimestampTz now, VirtualTransactionId *wait_list, bool still_waiting)
 
void StandbyAcquireAccessExclusiveLock (TransactionId xid, Oid dbOid, Oid relOid)
 
void StandbyReleaseLockTree (TransactionId xid, int nsubxids, TransactionId *subxids)
 
void StandbyReleaseAllLocks (void)
 
void StandbyReleaseOldLocks (TransactionId oldxid)
 
void LogAccessExclusiveLock (Oid dbOid, Oid relOid)
 
void LogAccessExclusiveLockPrepare (void)
 
XLogRecPtr LogStandbySnapshot (void)
 
void LogStandbyInvalidations (int nmsgs, SharedInvalidationMessage *msgs, bool relcacheInitFileInval)
 

Variables

PGDLLIMPORT int max_standby_archive_delay
 
PGDLLIMPORT int max_standby_streaming_delay
 
PGDLLIMPORT bool log_recovery_conflict_waits
 

Macro Definition Documentation

◆ MinSizeOfXactRunningXacts

#define MinSizeOfXactRunningXacts   offsetof(xl_running_xacts, xids)

Definition at line 63 of file standby.h.

Typedef Documentation

◆ RunningTransactions

Definition at line 90 of file standby.h.

◆ RunningTransactionsData

Function Documentation

◆ CheckRecoveryConflictDeadlock()

void CheckRecoveryConflictDeadlock ( void  )

Definition at line 905 of file standby.c.

906 {
907  Assert(!InRecovery); /* do not call in Startup process */
908 
910  return;
911 
912  /*
913  * Error message should match ProcessInterrupts() but we avoid calling
914  * that because we aren't handling an interrupt at this point. Note that
915  * we only cancel the current transaction here, so if we are in a
916  * subtransaction and the pin is held by a parent, then the Startup
917  * process will continue to wait even though we have avoided deadlock.
918  */
919  ereport(ERROR,
921  errmsg("canceling statement due to conflict with recovery"),
922  errdetail("User transaction caused buffer deadlock with recovery.")));
923 }
bool HoldingBufferPinThatDelaysRecovery(void)
Definition: bufmgr.c:5023
int errdetail(const char *fmt,...)
Definition: elog.c:1202
int errcode(int sqlerrcode)
Definition: elog.c:858
int errmsg(const char *fmt,...)
Definition: elog.c:1069
#define ERROR
Definition: elog.h:39
#define ereport(elevel,...)
Definition: elog.h:149
Assert(fmt[strlen(fmt) - 1] !='\n')
#define ERRCODE_T_R_DEADLOCK_DETECTED
Definition: pgbench.c:77
bool InRecovery
Definition: xlogutils.c:53

References Assert(), ereport, errcode(), ERRCODE_T_R_DEADLOCK_DETECTED, errdetail(), errmsg(), ERROR, HoldingBufferPinThatDelaysRecovery(), and InRecovery.

Referenced by ProcSleep().

◆ InitRecoveryTransactionEnvironment()

void InitRecoveryTransactionEnvironment ( void  )

Definition at line 96 of file standby.c.

97 {
99  HASHCTL hash_ctl;
100 
101  Assert(RecoveryLockHash == NULL); /* don't run this twice */
102 
103  /*
104  * Initialize the hash tables for tracking the locks held by each
105  * transaction.
106  */
107  hash_ctl.keysize = sizeof(xl_standby_lock);
108  hash_ctl.entrysize = sizeof(RecoveryLockEntry);
109  RecoveryLockHash = hash_create("RecoveryLockHash",
110  64,
111  &hash_ctl,
113  hash_ctl.keysize = sizeof(TransactionId);
114  hash_ctl.entrysize = sizeof(RecoveryLockXidEntry);
115  RecoveryLockXidHash = hash_create("RecoveryLockXidHash",
116  64,
117  &hash_ctl,
119 
120  /*
121  * Initialize shared invalidation management for Startup process, being
122  * careful to register ourselves as a sendOnly process so we don't need to
123  * read messages, nor will we get signaled when the queue starts filling
124  * up.
125  */
127 
128  /*
129  * Lock a virtual transaction id for Startup process.
130  *
131  * We need to do GetNextLocalTransactionId() because
132  * SharedInvalBackendInit() leaves localTransactionId invalid and the lock
133  * manager doesn't like that at all.
134  *
135  * Note that we don't need to run XactLockTableInsert() because nobody
136  * needs to wait on xids. That sounds a little strange, but table locks
137  * are held by vxids and row level locks are held by xids. All queries
138  * hold AccessShareLocks so never block while we write or lock new rows.
139  */
140  vxid.backendId = MyBackendId;
143 
145 }
uint32 TransactionId
Definition: c.h:641
HTAB * hash_create(const char *tabname, long nelem, const HASHCTL *info, int flags)
Definition: dynahash.c:350
BackendId MyBackendId
Definition: globals.c:85
#define HASH_ELEM
Definition: hsearch.h:95
#define HASH_BLOBS
Definition: hsearch.h:97
void VirtualXactLockTableInsert(VirtualTransactionId vxid)
Definition: lock.c:4388
struct xl_standby_lock xl_standby_lock
void SharedInvalBackendInit(bool sendOnly)
Definition: sinvaladt.c:266
LocalTransactionId GetNextLocalTransactionId(void)
Definition: sinvaladt.c:780
static HTAB * RecoveryLockXidHash
Definition: standby.c:67
struct RecoveryLockEntry RecoveryLockEntry
struct RecoveryLockXidEntry RecoveryLockXidEntry
static HTAB * RecoveryLockHash
Definition: standby.c:66
Size keysize
Definition: hsearch.h:75
Size entrysize
Definition: hsearch.h:76
LocalTransactionId localTransactionId
Definition: lock.h:62
BackendId backendId
Definition: lock.h:61
HotStandbyState standbyState
Definition: xlogutils.c:56
@ STANDBY_INITIALIZED
Definition: xlogutils.h:50

References Assert(), VirtualTransactionId::backendId, HASHCTL::entrysize, GetNextLocalTransactionId(), HASH_BLOBS, hash_create(), HASH_ELEM, HASHCTL::keysize, VirtualTransactionId::localTransactionId, MyBackendId, RecoveryLockHash, RecoveryLockXidHash, SharedInvalBackendInit(), STANDBY_INITIALIZED, standbyState, and VirtualXactLockTableInsert().

Referenced by StartupXLOG().

◆ LogAccessExclusiveLock()

void LogAccessExclusiveLock ( Oid  dbOid,
Oid  relOid 
)

Definition at line 1425 of file standby.c.

1426 {
1427  xl_standby_lock xlrec;
1428 
1429  xlrec.xid = GetCurrentTransactionId();
1430 
1431  xlrec.dbOid = dbOid;
1432  xlrec.relOid = relOid;
1433 
1434  LogAccessExclusiveLocks(1, &xlrec);
1436 }
static void LogAccessExclusiveLocks(int nlocks, xl_standby_lock *locks)
Definition: standby.c:1407
TransactionId xid
Definition: lockdefs.h:51
TransactionId GetCurrentTransactionId(void)
Definition: xact.c:445
int MyXactFlags
Definition: xact.c:136
#define XACT_FLAGS_ACQUIREDACCESSEXCLUSIVELOCK
Definition: xact.h:108

References xl_standby_lock::dbOid, GetCurrentTransactionId(), LogAccessExclusiveLocks(), MyXactFlags, xl_standby_lock::relOid, XACT_FLAGS_ACQUIREDACCESSEXCLUSIVELOCK, and xl_standby_lock::xid.

Referenced by LockAcquireExtended().

◆ LogAccessExclusiveLockPrepare()

void LogAccessExclusiveLockPrepare ( void  )

Definition at line 1442 of file standby.c.

1443 {
1444  /*
1445  * Ensure that a TransactionId has been assigned to this transaction, for
1446  * two reasons, both related to lock release on the standby. First, we
1447  * must assign an xid so that RecordTransactionCommit() and
1448  * RecordTransactionAbort() do not optimise away the transaction
1449  * completion record which recovery relies upon to release locks. It's a
1450  * hack, but for a corner case not worth adding code for into the main
1451  * commit path. Second, we must assign an xid before the lock is recorded
1452  * in shared memory, otherwise a concurrently executing
1453  * GetRunningTransactionLocks() might see a lock associated with an
1454  * InvalidTransactionId which we later assert cannot happen.
1455  */
1456  (void) GetCurrentTransactionId();
1457 }

References GetCurrentTransactionId().

Referenced by LockAcquireExtended().

◆ LogRecoveryConflict()

void LogRecoveryConflict ( ProcSignalReason  reason,
TimestampTz  wait_start,
TimestampTz  now,
VirtualTransactionId wait_list,
bool  still_waiting 
)

Definition at line 274 of file standby.c.

277 {
278  long secs;
279  int usecs;
280  long msecs;
282  int nprocs = 0;
283 
284  /*
285  * There must be no conflicting processes when the recovery conflict has
286  * already been resolved.
287  */
288  Assert(still_waiting || wait_list == NULL);
289 
290  TimestampDifference(wait_start, now, &secs, &usecs);
291  msecs = secs * 1000 + usecs / 1000;
292  usecs = usecs % 1000;
293 
294  if (wait_list)
295  {
296  VirtualTransactionId *vxids;
297 
298  /* Construct a string of list of the conflicting processes */
299  vxids = wait_list;
300  while (VirtualTransactionIdIsValid(*vxids))
301  {
302  PGPROC *proc = BackendIdGetProc(vxids->backendId);
303 
304  /* proc can be NULL if the target backend is not active */
305  if (proc)
306  {
307  if (nprocs == 0)
308  {
310  appendStringInfo(&buf, "%d", proc->pid);
311  }
312  else
313  appendStringInfo(&buf, ", %d", proc->pid);
314 
315  nprocs++;
316  }
317 
318  vxids++;
319  }
320  }
321 
322  /*
323  * If wait_list is specified, report the list of PIDs of active
324  * conflicting backends in a detail message. Note that if all the backends
325  * in the list are not active, no detail message is logged.
326  */
327  if (still_waiting)
328  {
329  ereport(LOG,
330  errmsg("recovery still waiting after %ld.%03d ms: %s",
331  msecs, usecs, get_recovery_conflict_desc(reason)),
332  nprocs > 0 ? errdetail_log_plural("Conflicting process: %s.",
333  "Conflicting processes: %s.",
334  nprocs, buf.data) : 0);
335  }
336  else
337  {
338  ereport(LOG,
339  errmsg("recovery finished waiting after %ld.%03d ms: %s",
340  msecs, usecs, get_recovery_conflict_desc(reason)));
341  }
342 
343  if (nprocs > 0)
344  pfree(buf.data);
345 }
void TimestampDifference(TimestampTz start_time, TimestampTz stop_time, long *secs, int *microsecs)
Definition: timestamp.c:1725
Datum now(PG_FUNCTION_ARGS)
Definition: timestamp.c:1613
int errdetail_log_plural(const char *fmt_singular, const char *fmt_plural, unsigned long n,...)
Definition: elog.c:1271
#define LOG
Definition: elog.h:31
#define VirtualTransactionIdIsValid(vxid)
Definition: lock.h:67
void pfree(void *pointer)
Definition: mcxt.c:1456
static char * buf
Definition: pg_test_fsync.c:73
PGPROC * BackendIdGetProc(int backendID)
Definition: sinvaladt.c:385
static const char * get_recovery_conflict_desc(ProcSignalReason reason)
Definition: standby.c:1486
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:97
void initStringInfo(StringInfo str)
Definition: stringinfo.c:59
Definition: proc.h:162
int pid
Definition: proc.h:186

References appendStringInfo(), Assert(), VirtualTransactionId::backendId, BackendIdGetProc(), buf, ereport, errdetail_log_plural(), errmsg(), get_recovery_conflict_desc(), initStringInfo(), LOG, now(), pfree(), PGPROC::pid, TimestampDifference(), and VirtualTransactionIdIsValid.

Referenced by LockBufferForCleanup(), ProcSleep(), and ResolveRecoveryConflictWithVirtualXIDs().

◆ LogStandbyInvalidations()

void LogStandbyInvalidations ( int  nmsgs,
SharedInvalidationMessage msgs,
bool  relcacheInitFileInval 
)

Definition at line 1464 of file standby.c.

1466 {
1467  xl_invalidations xlrec;
1468 
1469  /* prepare record */
1470  memset(&xlrec, 0, sizeof(xlrec));
1471  xlrec.dbId = MyDatabaseId;
1472  xlrec.tsId = MyDatabaseTableSpace;
1473  xlrec.relcacheInitFileInval = relcacheInitFileInval;
1474  xlrec.nmsgs = nmsgs;
1475 
1476  /* perform insertion */
1477  XLogBeginInsert();
1478  XLogRegisterData((char *) (&xlrec), MinSizeOfInvalidations);
1479  XLogRegisterData((char *) msgs,
1480  nmsgs * sizeof(SharedInvalidationMessage));
1481  XLogInsert(RM_STANDBY_ID, XLOG_INVALIDATIONS);
1482 }
Oid MyDatabaseTableSpace
Definition: globals.c:91
Oid MyDatabaseId
Definition: globals.c:89
#define XLOG_INVALIDATIONS
Definition: standbydefs.h:36
#define MinSizeOfInvalidations
Definition: standbydefs.h:72
bool relcacheInitFileInval
Definition: standbydefs.h:67
void XLogRegisterData(char *data, uint32 len)
Definition: xloginsert.c:365
XLogRecPtr XLogInsert(RmgrId rmid, uint8 info)
Definition: xloginsert.c:475
void XLogBeginInsert(void)
Definition: xloginsert.c:150

References xl_invalidations::dbId, MinSizeOfInvalidations, MyDatabaseId, MyDatabaseTableSpace, xl_invalidations::nmsgs, xl_invalidations::relcacheInitFileInval, xl_invalidations::tsId, XLOG_INVALIDATIONS, XLogBeginInsert(), XLogInsert(), and XLogRegisterData().

Referenced by RecordTransactionCommit().

◆ LogStandbySnapshot()

XLogRecPtr LogStandbySnapshot ( void  )

Definition at line 1287 of file standby.c.

1288 {
1289  XLogRecPtr recptr;
1290  RunningTransactions running;
1291  xl_standby_lock *locks;
1292  int nlocks;
1293 
1295 
1296  /*
1297  * Get details of any AccessExclusiveLocks being held at the moment.
1298  */
1299  locks = GetRunningTransactionLocks(&nlocks);
1300  if (nlocks > 0)
1301  LogAccessExclusiveLocks(nlocks, locks);
1302  pfree(locks);
1303 
1304  /*
1305  * Log details of all in-progress transactions. This should be the last
1306  * record we write, because standby will open up when it sees this.
1307  */
1308  running = GetRunningTransactionData();
1309 
1310  /*
1311  * GetRunningTransactionData() acquired ProcArrayLock, we must release it.
1312  * For Hot Standby this can be done before inserting the WAL record
1313  * because ProcArrayApplyRecoveryInfo() rechecks the commit status using
1314  * the clog. For logical decoding, though, the lock can't be released
1315  * early because the clog might be "in the future" from the POV of the
1316  * historic snapshot. This would allow for situations where we're waiting
1317  * for the end of a transaction listed in the xl_running_xacts record
1318  * which, according to the WAL, has committed before the xl_running_xacts
1319  * record. Fortunately this routine isn't executed frequently, and it's
1320  * only a shared lock.
1321  */
1323  LWLockRelease(ProcArrayLock);
1324 
1325  recptr = LogCurrentRunningXacts(running);
1326 
1327  /* Release lock if we kept it longer ... */
1329  LWLockRelease(ProcArrayLock);
1330 
1331  /* GetRunningTransactionData() acquired XidGenLock, we must release it */
1332  LWLockRelease(XidGenLock);
1333 
1334  return recptr;
1335 }
xl_standby_lock * GetRunningTransactionLocks(int *nlocks)
Definition: lock.c:3939
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1808
RunningTransactions GetRunningTransactionData(void)
Definition: procarray.c:2669
static XLogRecPtr LogCurrentRunningXacts(RunningTransactions CurrRunningXacts)
Definition: standby.c:1347
int wal_level
Definition: xlog.c:134
@ WAL_LEVEL_LOGICAL
Definition: xlog.h:74
#define XLogStandbyInfoActive()
Definition: xlog.h:121
uint64 XLogRecPtr
Definition: xlogdefs.h:21

References Assert(), GetRunningTransactionData(), GetRunningTransactionLocks(), LogAccessExclusiveLocks(), LogCurrentRunningXacts(), LWLockRelease(), pfree(), wal_level, WAL_LEVEL_LOGICAL, and XLogStandbyInfoActive.

Referenced by BackgroundWriterMain(), CreateCheckPoint(), pg_log_standby_snapshot(), ReplicationSlotReserveWal(), and SnapBuildWaitSnapshot().

◆ ResolveRecoveryConflictWithBufferPin()

void ResolveRecoveryConflictWithBufferPin ( void  )

Definition at line 793 of file standby.c.

794 {
795  TimestampTz ltime;
796 
798 
799  ltime = GetStandbyLimitTime();
800 
801  if (GetCurrentTimestamp() >= ltime && ltime != 0)
802  {
803  /*
804  * We're already behind, so clear a path as quickly as possible.
805  */
807  }
808  else
809  {
810  /*
811  * Wake up at ltime, and check for deadlocks as well if we will be
812  * waiting longer than deadlock_timeout
813  */
814  EnableTimeoutParams timeouts[2];
815  int cnt = 0;
816 
817  if (ltime != 0)
818  {
819  timeouts[cnt].id = STANDBY_TIMEOUT;
820  timeouts[cnt].type = TMPARAM_AT;
821  timeouts[cnt].fin_time = ltime;
822  cnt++;
823  }
824 
826  timeouts[cnt].id = STANDBY_DEADLOCK_TIMEOUT;
827  timeouts[cnt].type = TMPARAM_AFTER;
828  timeouts[cnt].delay_ms = DeadlockTimeout;
829  cnt++;
830 
831  enable_timeouts(timeouts, cnt);
832  }
833 
834  /*
835  * Wait to be signaled by UnpinBuffer() or for the wait to be interrupted
836  * by one of the timeouts established above.
837  *
838  * We assume that only UnpinBuffer() and the timeout requests established
839  * above can wake us up here. WakeupRecovery() called by walreceiver or
840  * SIGHUP signal handler, etc cannot do that because it uses the different
841  * latch from that ProcWaitForSignal() waits on.
842  */
843  ProcWaitForSignal(WAIT_EVENT_BUFFER_PIN);
844 
848  {
849  /*
850  * Send out a request for hot-standby backends to check themselves for
851  * deadlocks.
852  *
853  * XXX The subsequent ResolveRecoveryConflictWithBufferPin() will wait
854  * to be signaled by UnpinBuffer() again and send a request for
855  * deadlocks check if deadlock_timeout happens. This causes the
856  * request to continue to be sent every deadlock_timeout until the
857  * buffer is unpinned or ltime is reached. This would increase the
858  * workload in the startup process and backends. In practice it may
859  * not be so harmful because the period that the buffer is kept pinned
860  * is basically no so long. But we should fix this?
861  */
863  }
864 
865  /*
866  * Clear any timeout requests established above. We assume here that the
867  * Startup process doesn't have any other timeouts than what this function
868  * uses. If that stops being true, we could cancel the timeouts
869  * individually, but that'd be slower.
870  */
871  disable_all_timeouts(false);
874 }
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1649
int64 TimestampTz
Definition: timestamp.h:39
@ PROCSIG_RECOVERY_CONFLICT_BUFFERPIN
Definition: procsignal.h:47
@ PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK
Definition: procsignal.h:48
int DeadlockTimeout
Definition: proc.c:58
void ProcWaitForSignal(uint32 wait_event_info)
Definition: proc.c:1805
static volatile sig_atomic_t got_standby_deadlock_timeout
Definition: standby.c:70
static TimestampTz GetStandbyLimitTime(void)
Definition: standby.c:201
static volatile sig_atomic_t got_standby_delay_timeout
Definition: standby.c:71
static void SendRecoveryConflictWithBufferPin(ProcSignalReason reason)
Definition: standby.c:877
TimeoutType type
Definition: timeout.h:60
TimestampTz fin_time
Definition: timeout.h:62
TimeoutId id
Definition: timeout.h:59
void disable_all_timeouts(bool keep_indicators)
Definition: timeout.c:755
void enable_timeouts(const EnableTimeoutParams *timeouts, int count)
Definition: timeout.c:634
@ STANDBY_DEADLOCK_TIMEOUT
Definition: timeout.h:30
@ STANDBY_TIMEOUT
Definition: timeout.h:31
@ TMPARAM_AT
Definition: timeout.h:53
@ TMPARAM_AFTER
Definition: timeout.h:52
#define InHotStandby
Definition: xlogutils.h:57

References Assert(), DeadlockTimeout, EnableTimeoutParams::delay_ms, disable_all_timeouts(), enable_timeouts(), EnableTimeoutParams::fin_time, GetCurrentTimestamp(), GetStandbyLimitTime(), got_standby_deadlock_timeout, got_standby_delay_timeout, EnableTimeoutParams::id, InHotStandby, PROCSIG_RECOVERY_CONFLICT_BUFFERPIN, PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK, ProcWaitForSignal(), SendRecoveryConflictWithBufferPin(), STANDBY_DEADLOCK_TIMEOUT, STANDBY_TIMEOUT, TMPARAM_AFTER, TMPARAM_AT, and EnableTimeoutParams::type.

Referenced by LockBufferForCleanup().

◆ ResolveRecoveryConflictWithDatabase()

void ResolveRecoveryConflictWithDatabase ( Oid  dbid)

Definition at line 569 of file standby.c.

570 {
571  /*
572  * We don't do ResolveRecoveryConflictWithVirtualXIDs() here since that
573  * only waits for transactions and completely idle sessions would block
574  * us. This is rare enough that we do this as simply as possible: no wait,
575  * just force them off immediately.
576  *
577  * No locking is required here because we already acquired
578  * AccessExclusiveLock. Anybody trying to connect while we do this will
579  * block during InitPostgres() and then disconnect when they see the
580  * database has been removed.
581  */
582  while (CountDBBackends(dbid) > 0)
583  {
585 
586  /*
587  * Wait awhile for them to die so that we avoid flooding an
588  * unresponsive backend when system is heavily loaded.
589  */
590  pg_usleep(10000);
591  }
592 }
void CancelDBBackends(Oid databaseid, ProcSignalReason sigmode, bool conflictPending)
Definition: procarray.c:3566
int CountDBBackends(Oid databaseid)
Definition: procarray.c:3505
@ PROCSIG_RECOVERY_CONFLICT_DATABASE
Definition: procsignal.h:42
void pg_usleep(long microsec)
Definition: signal.c:53

References CancelDBBackends(), CountDBBackends(), pg_usleep(), and PROCSIG_RECOVERY_CONFLICT_DATABASE.

Referenced by dbase_redo().

◆ ResolveRecoveryConflictWithLock()

void ResolveRecoveryConflictWithLock ( LOCKTAG  locktag,
bool  logging_conflict 
)

Definition at line 623 of file standby.c.

624 {
625  TimestampTz ltime;
627 
629 
630  ltime = GetStandbyLimitTime();
632 
633  /*
634  * Update waitStart if first time through after the startup process
635  * started waiting for the lock. It should not be updated every time
636  * ResolveRecoveryConflictWithLock() is called during the wait.
637  *
638  * Use the current time obtained for comparison with ltime as waitStart
639  * (i.e., the time when this process started waiting for the lock). Since
640  * getting the current time newly can cause overhead, we reuse the
641  * already-obtained time to avoid that overhead.
642  *
643  * Note that waitStart is updated without holding the lock table's
644  * partition lock, to avoid the overhead by additional lock acquisition.
645  * This can cause "waitstart" in pg_locks to become NULL for a very short
646  * period of time after the wait started even though "granted" is false.
647  * This is OK in practice because we can assume that users are likely to
648  * look at "waitstart" when waiting for the lock for a long time.
649  */
650  if (pg_atomic_read_u64(&MyProc->waitStart) == 0)
652 
653  if (now >= ltime && ltime != 0)
654  {
655  /*
656  * We're already behind, so clear a path as quickly as possible.
657  */
658  VirtualTransactionId *backends;
659 
660  backends = GetLockConflicts(&locktag, AccessExclusiveLock, NULL);
661 
662  /*
663  * Prevent ResolveRecoveryConflictWithVirtualXIDs() from reporting
664  * "waiting" in PS display by disabling its argument report_waiting
665  * because the caller, WaitOnLock(), has already reported that.
666  */
669  PG_WAIT_LOCK | locktag.locktag_type,
670  false);
671  }
672  else
673  {
674  /*
675  * Wait (or wait again) until ltime, and check for deadlocks as well
676  * if we will be waiting longer than deadlock_timeout
677  */
678  EnableTimeoutParams timeouts[2];
679  int cnt = 0;
680 
681  if (ltime != 0)
682  {
683  got_standby_lock_timeout = false;
684  timeouts[cnt].id = STANDBY_LOCK_TIMEOUT;
685  timeouts[cnt].type = TMPARAM_AT;
686  timeouts[cnt].fin_time = ltime;
687  cnt++;
688  }
689 
691  timeouts[cnt].id = STANDBY_DEADLOCK_TIMEOUT;
692  timeouts[cnt].type = TMPARAM_AFTER;
693  timeouts[cnt].delay_ms = DeadlockTimeout;
694  cnt++;
695 
696  enable_timeouts(timeouts, cnt);
697  }
698 
699  /* Wait to be signaled by the release of the Relation Lock */
701 
702  /*
703  * Exit if ltime is reached. Then all the backends holding conflicting
704  * locks will be canceled in the next ResolveRecoveryConflictWithLock()
705  * call.
706  */
708  goto cleanup;
709 
711  {
712  VirtualTransactionId *backends;
713 
714  backends = GetLockConflicts(&locktag, AccessExclusiveLock, NULL);
715 
716  /* Quick exit if there's no work to be done */
717  if (!VirtualTransactionIdIsValid(*backends))
718  goto cleanup;
719 
720  /*
721  * Send signals to all the backends holding the conflicting locks, to
722  * ask them to check themselves for deadlocks.
723  */
724  while (VirtualTransactionIdIsValid(*backends))
725  {
726  SignalVirtualTransaction(*backends,
728  false);
729  backends++;
730  }
731 
732  /*
733  * Exit if the recovery conflict has not been logged yet even though
734  * logging is enabled, so that the caller can log that. Then
735  * RecoveryConflictWithLock() is called again and we will wait again
736  * for the lock to be released.
737  */
738  if (logging_conflict)
739  goto cleanup;
740 
741  /*
742  * Wait again here to be signaled by the release of the Relation Lock,
743  * to prevent the subsequent RecoveryConflictWithLock() from causing
744  * deadlock_timeout and sending a request for deadlocks check again.
745  * Otherwise the request continues to be sent every deadlock_timeout
746  * until the relation locks are released or ltime is reached.
747  */
750  }
751 
752 cleanup:
753 
754  /*
755  * Clear any timeout requests established above. We assume here that the
756  * Startup process doesn't have any other outstanding timeouts than those
757  * used by this function. If that stops being true, we could cancel the
758  * timeouts individually, but that'd be slower.
759  */
760  disable_all_timeouts(false);
761  got_standby_lock_timeout = false;
763 }
static void pg_atomic_write_u64(volatile pg_atomic_uint64 *ptr, uint64 val)
Definition: atomics.h:433
static uint64 pg_atomic_read_u64(volatile pg_atomic_uint64 *ptr)
Definition: atomics.h:424
static void cleanup(void)
Definition: bootstrap.c:687
VirtualTransactionId * GetLockConflicts(const LOCKTAG *locktag, LOCKMODE lockmode, int *countp)
Definition: lock.c:2855
#define AccessExclusiveLock
Definition: lockdefs.h:43
pid_t SignalVirtualTransaction(VirtualTransactionId vxid, ProcSignalReason sigmode, bool conflictPending)
Definition: procarray.c:3403
@ PROCSIG_RECOVERY_CONFLICT_LOCK
Definition: procsignal.h:44
PGPROC * MyProc
Definition: proc.c:66
static void ResolveRecoveryConflictWithVirtualXIDs(VirtualTransactionId *waitlist, ProcSignalReason reason, uint32 wait_event_info, bool report_waiting)
Definition: standby.c:360
static volatile sig_atomic_t got_standby_lock_timeout
Definition: standby.c:72
uint8 locktag_type
Definition: lock.h:170
pg_atomic_uint64 waitStart
Definition: proc.h:228
@ STANDBY_LOCK_TIMEOUT
Definition: timeout.h:32
#define PG_WAIT_LOCK
Definition: wait_event.h:19

References AccessExclusiveLock, Assert(), cleanup(), DeadlockTimeout, EnableTimeoutParams::delay_ms, disable_all_timeouts(), enable_timeouts(), EnableTimeoutParams::fin_time, GetCurrentTimestamp(), GetLockConflicts(), GetStandbyLimitTime(), got_standby_deadlock_timeout, got_standby_lock_timeout, EnableTimeoutParams::id, InHotStandby, LOCKTAG::locktag_type, MyProc, now(), pg_atomic_read_u64(), pg_atomic_write_u64(), PG_WAIT_LOCK, PROCSIG_RECOVERY_CONFLICT_LOCK, PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK, ProcWaitForSignal(), ResolveRecoveryConflictWithVirtualXIDs(), SignalVirtualTransaction(), STANDBY_DEADLOCK_TIMEOUT, STANDBY_LOCK_TIMEOUT, TMPARAM_AFTER, TMPARAM_AT, EnableTimeoutParams::type, VirtualTransactionIdIsValid, and PGPROC::waitStart.

Referenced by ProcSleep().

◆ ResolveRecoveryConflictWithSnapshot()

void ResolveRecoveryConflictWithSnapshot ( TransactionId  snapshotConflictHorizon,
bool  isCatalogRel,
RelFileLocator  locator 
)

Definition at line 468 of file standby.c.

471 {
472  VirtualTransactionId *backends;
473 
474  /*
475  * If we get passed InvalidTransactionId then we do nothing (no conflict).
476  *
477  * This can happen when replaying already-applied WAL records after a
478  * standby crash or restart, or when replaying an XLOG_HEAP2_VISIBLE
479  * record that marks as frozen a page which was already all-visible. It's
480  * also quite common with records generated during index deletion
481  * (original execution of the deletion can reason that a recovery conflict
482  * which is sufficient for the deletion operation must take place before
483  * replay of the deletion record itself).
484  */
485  if (!TransactionIdIsValid(snapshotConflictHorizon))
486  return;
487 
488  Assert(TransactionIdIsNormal(snapshotConflictHorizon));
489  backends = GetConflictingVirtualXIDs(snapshotConflictHorizon,
490  locator.dbOid);
493  WAIT_EVENT_RECOVERY_CONFLICT_SNAPSHOT,
494  true);
495 
496  /*
497  * Note that WaitExceedsMaxStandbyDelay() is not taken into account here
498  * (as opposed to ResolveRecoveryConflictWithVirtualXIDs() above). That
499  * seems OK, given that this kind of conflict should not normally be
500  * reached, e.g. due to using a physical replication slot.
501  */
502  if (wal_level >= WAL_LEVEL_LOGICAL && isCatalogRel)
504  snapshotConflictHorizon);
505 }
VirtualTransactionId * GetConflictingVirtualXIDs(TransactionId limitXmin, Oid dbOid)
Definition: procarray.c:3323
@ PROCSIG_RECOVERY_CONFLICT_SNAPSHOT
Definition: procsignal.h:45
bool InvalidateObsoleteReplicationSlots(ReplicationSlotInvalidationCause cause, XLogSegNo oldestSegno, Oid dboid, TransactionId snapshotConflictHorizon)
Definition: slot.c:1564
@ RS_INVAL_HORIZON
Definition: slot.h:50
#define TransactionIdIsValid(xid)
Definition: transam.h:41
#define TransactionIdIsNormal(xid)
Definition: transam.h:42

References Assert(), RelFileLocator::dbOid, GetConflictingVirtualXIDs(), InvalidateObsoleteReplicationSlots(), PROCSIG_RECOVERY_CONFLICT_SNAPSHOT, ResolveRecoveryConflictWithVirtualXIDs(), RS_INVAL_HORIZON, TransactionIdIsNormal, TransactionIdIsValid, wal_level, and WAL_LEVEL_LOGICAL.

Referenced by btree_xlog_delete(), gistRedoDeleteRecord(), hash_xlog_vacuum_one_page(), heap_xlog_freeze_page(), heap_xlog_prune(), heap_xlog_visible(), ResolveRecoveryConflictWithSnapshotFullXid(), and spgRedoVacuumRedirect().

◆ ResolveRecoveryConflictWithSnapshotFullXid()

void ResolveRecoveryConflictWithSnapshotFullXid ( FullTransactionId  snapshotConflictHorizon,
bool  isCatalogRel,
RelFileLocator  locator 
)

Definition at line 512 of file standby.c.

515 {
516  /*
517  * ResolveRecoveryConflictWithSnapshot operates on 32-bit TransactionIds,
518  * so truncate the logged FullTransactionId. If the logged value is very
519  * old, so that XID wrap-around already happened on it, there can't be any
520  * snapshots that still see it.
521  */
523  uint64 diff;
524 
525  diff = U64FromFullTransactionId(nextXid) -
526  U64FromFullTransactionId(snapshotConflictHorizon);
527  if (diff < MaxTransactionId / 2)
528  {
529  TransactionId truncated;
530 
531  truncated = XidFromFullTransactionId(snapshotConflictHorizon);
533  isCatalogRel,
534  locator);
535  }
536 }
void ResolveRecoveryConflictWithSnapshot(TransactionId snapshotConflictHorizon, bool isCatalogRel, RelFileLocator locator)
Definition: standby.c:468
#define U64FromFullTransactionId(x)
Definition: transam.h:49
#define XidFromFullTransactionId(x)
Definition: transam.h:48
#define MaxTransactionId
Definition: transam.h:35
FullTransactionId ReadNextFullTransactionId(void)
Definition: varsup.c:261

References MaxTransactionId, ReadNextFullTransactionId(), ResolveRecoveryConflictWithSnapshot(), U64FromFullTransactionId, and XidFromFullTransactionId.

Referenced by btree_xlog_reuse_page(), and gistRedoPageReuse().

◆ ResolveRecoveryConflictWithTablespace()

void ResolveRecoveryConflictWithTablespace ( Oid  tsid)

Definition at line 539 of file standby.c.

540 {
541  VirtualTransactionId *temp_file_users;
542 
543  /*
544  * Standby users may be currently using this tablespace for their
545  * temporary files. We only care about current users because
546  * temp_tablespace parameter will just ignore tablespaces that no longer
547  * exist.
548  *
549  * Ask everybody to cancel their queries immediately so we can ensure no
550  * temp files remain and we can remove the tablespace. Nuke the entire
551  * site from orbit, it's the only way to be sure.
552  *
553  * XXX: We could work out the pids of active backends using this
554  * tablespace by examining the temp filenames in the directory. We would
555  * then convert the pids into VirtualXIDs before attempting to cancel
556  * them.
557  *
558  * We don't wait for commit because drop tablespace is non-transactional.
559  */
561  InvalidOid);
564  WAIT_EVENT_RECOVERY_CONFLICT_TABLESPACE,
565  true);
566 }
#define InvalidOid
Definition: postgres_ext.h:36
@ PROCSIG_RECOVERY_CONFLICT_TABLESPACE
Definition: procsignal.h:43
#define InvalidTransactionId
Definition: transam.h:31

References GetConflictingVirtualXIDs(), InvalidOid, InvalidTransactionId, PROCSIG_RECOVERY_CONFLICT_TABLESPACE, and ResolveRecoveryConflictWithVirtualXIDs().

Referenced by tblspc_redo().

◆ ShutdownRecoveryTransactionEnvironment()

void ShutdownRecoveryTransactionEnvironment ( void  )

Definition at line 161 of file standby.c.

162 {
163  /*
164  * Do nothing if RecoveryLockHash is NULL because that means that
165  * transaction tracking has not yet been initialized or has already been
166  * shut down. This makes it safe to have possibly-redundant calls of this
167  * function during process exit.
168  */
169  if (RecoveryLockHash == NULL)
170  return;
171 
172  /* Mark all tracked in-progress transactions as finished. */
174 
175  /* Release all locks the tracked transactions were holding */
177 
178  /* Destroy the lock hash tables. */
181  RecoveryLockHash = NULL;
182  RecoveryLockXidHash = NULL;
183 
184  /* Cleanup our VirtualTransaction */
186 }
void hash_destroy(HTAB *hashp)
Definition: dynahash.c:863
void VirtualXactLockTableCleanup(void)
Definition: lock.c:4411
void ExpireAllKnownAssignedTransactionIds(void)
Definition: procarray.c:4431
void StandbyReleaseAllLocks(void)
Definition: standby.c:1107

References ExpireAllKnownAssignedTransactionIds(), hash_destroy(), RecoveryLockHash, RecoveryLockXidHash, StandbyReleaseAllLocks(), and VirtualXactLockTableCleanup().

Referenced by StartupProcExit(), and StartupXLOG().

◆ StandbyAcquireAccessExclusiveLock()

void StandbyAcquireAccessExclusiveLock ( TransactionId  xid,
Oid  dbOid,
Oid  relOid 
)

Definition at line 986 of file standby.c.

987 {
988  RecoveryLockXidEntry *xidentry;
989  RecoveryLockEntry *lockentry;
991  LOCKTAG locktag;
992  bool found;
993 
994  /* Already processed? */
995  if (!TransactionIdIsValid(xid) ||
996  TransactionIdDidCommit(xid) ||
998  return;
999 
1001  "adding recovery lock: db %u rel %u", dbOid, relOid);
1002 
1003  /* dbOid is InvalidOid when we are locking a shared relation. */
1004  Assert(OidIsValid(relOid));
1005 
1006  /* Create a hash entry for this xid, if we don't have one already. */
1007  xidentry = hash_search(RecoveryLockXidHash, &xid, HASH_ENTER, &found);
1008  if (!found)
1009  {
1010  Assert(xidentry->xid == xid); /* dynahash should have set this */
1011  xidentry->head = NULL;
1012  }
1013 
1014  /* Create a hash entry for this lock, unless we have one already. */
1015  key.xid = xid;
1016  key.dbOid = dbOid;
1017  key.relOid = relOid;
1018  lockentry = hash_search(RecoveryLockHash, &key, HASH_ENTER, &found);
1019  if (!found)
1020  {
1021  /* It's new, so link it into the XID's list ... */
1022  lockentry->next = xidentry->head;
1023  xidentry->head = lockentry;
1024 
1025  /* ... and acquire the lock locally. */
1026  SET_LOCKTAG_RELATION(locktag, dbOid, relOid);
1027 
1028  (void) LockAcquire(&locktag, AccessExclusiveLock, true, false);
1029  }
1030 }
#define OidIsValid(objectId)
Definition: c.h:764
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:953
int trace_recovery(int trace_level)
Definition: elog.c:3780
#define DEBUG4
Definition: elog.h:27
@ HASH_ENTER
Definition: hsearch.h:114
LockAcquireResult LockAcquire(const LOCKTAG *locktag, LOCKMODE lockmode, bool sessionLock, bool dontWait)
Definition: lock.c:735
#define SET_LOCKTAG_RELATION(locktag, dboid, reloid)
Definition: lock.h:181
Definition: lock.h:165
struct RecoveryLockEntry * next
Definition: standby.c:57
TransactionId xid
Definition: standby.c:62
struct RecoveryLockEntry * head
Definition: standby.c:63
bool TransactionIdDidCommit(TransactionId transactionId)
Definition: transam.c:126
bool TransactionIdDidAbort(TransactionId transactionId)
Definition: transam.c:188

References AccessExclusiveLock, Assert(), DEBUG4, elog(), HASH_ENTER, hash_search(), RecoveryLockXidEntry::head, sort-test::key, LockAcquire(), RecoveryLockEntry::next, OidIsValid, RecoveryLockHash, RecoveryLockXidHash, SET_LOCKTAG_RELATION, trace_recovery(), TransactionIdDidAbort(), TransactionIdDidCommit(), TransactionIdIsValid, and RecoveryLockXidEntry::xid.

Referenced by lock_twophase_standby_recover(), and standby_redo().

◆ StandbyDeadLockHandler()

void StandbyDeadLockHandler ( void  )

Definition at line 936 of file standby.c.

937 {
939 }

References got_standby_deadlock_timeout.

Referenced by StartupProcessMain().

◆ StandbyLockTimeoutHandler()

void StandbyLockTimeoutHandler ( void  )

Definition at line 954 of file standby.c.

955 {
957 }

References got_standby_lock_timeout.

Referenced by StartupProcessMain().

◆ StandbyReleaseAllLocks()

void StandbyReleaseAllLocks ( void  )

Definition at line 1107 of file standby.c.

1108 {
1109  HASH_SEQ_STATUS status;
1110  RecoveryLockXidEntry *entry;
1111 
1112  elog(trace_recovery(DEBUG2), "release all standby locks");
1113 
1115  while ((entry = hash_seq_search(&status)))
1116  {
1119  }
1120 }
void * hash_seq_search(HASH_SEQ_STATUS *status)
Definition: dynahash.c:1431
void hash_seq_init(HASH_SEQ_STATUS *status, HTAB *hashp)
Definition: dynahash.c:1421
#define DEBUG2
Definition: elog.h:29
@ HASH_REMOVE
Definition: hsearch.h:115
static void StandbyReleaseXidEntryLocks(RecoveryLockXidEntry *xidentry)
Definition: standby.c:1036

References DEBUG2, elog(), HASH_REMOVE, hash_search(), hash_seq_init(), hash_seq_search(), RecoveryLockXidHash, StandbyReleaseXidEntryLocks(), and trace_recovery().

Referenced by ShutdownRecoveryTransactionEnvironment(), and StandbyReleaseLocks().

◆ StandbyReleaseLockTree()

void StandbyReleaseLockTree ( TransactionId  xid,
int  nsubxids,
TransactionId subxids 
)

Definition at line 1093 of file standby.c.

1094 {
1095  int i;
1096 
1097  StandbyReleaseLocks(xid);
1098 
1099  for (i = 0; i < nsubxids; i++)
1100  StandbyReleaseLocks(subxids[i]);
1101 }
int i
Definition: isn.c:73
static void StandbyReleaseLocks(TransactionId xid)
Definition: standby.c:1069

References i, and StandbyReleaseLocks().

Referenced by RecoverPreparedTransactions(), xact_redo_abort(), and xact_redo_commit().

◆ StandbyReleaseOldLocks()

void StandbyReleaseOldLocks ( TransactionId  oldxid)

Definition at line 1128 of file standby.c.

1129 {
1130  HASH_SEQ_STATUS status;
1131  RecoveryLockXidEntry *entry;
1132 
1134  while ((entry = hash_seq_search(&status)))
1135  {
1136  Assert(TransactionIdIsValid(entry->xid));
1137 
1138  /* Skip if prepared transaction. */
1139  if (StandbyTransactionIdIsPrepared(entry->xid))
1140  continue;
1141 
1142  /* Skip if >= oldxid. */
1143  if (!TransactionIdPrecedes(entry->xid, oldxid))
1144  continue;
1145 
1146  /* Remove all locks and hash table entry. */
1149  }
1150 }
bool TransactionIdPrecedes(TransactionId id1, TransactionId id2)
Definition: transam.c:280
bool StandbyTransactionIdIsPrepared(TransactionId xid)
Definition: twophase.c:1491

References Assert(), HASH_REMOVE, hash_search(), hash_seq_init(), hash_seq_search(), RecoveryLockXidHash, StandbyReleaseXidEntryLocks(), StandbyTransactionIdIsPrepared(), TransactionIdIsValid, TransactionIdPrecedes(), and RecoveryLockXidEntry::xid.

Referenced by ProcArrayApplyRecoveryInfo().

◆ StandbyTimeoutHandler()

void StandbyTimeoutHandler ( void  )

Definition at line 945 of file standby.c.

946 {
948 }

References got_standby_delay_timeout.

Referenced by StartupProcessMain().

Variable Documentation

◆ log_recovery_conflict_waits

PGDLLIMPORT bool log_recovery_conflict_waits
extern

◆ max_standby_archive_delay

PGDLLIMPORT int max_standby_archive_delay
extern

Definition at line 41 of file standby.c.

Referenced by GetStandbyLimitTime().

◆ max_standby_streaming_delay

PGDLLIMPORT int max_standby_streaming_delay
extern

Definition at line 42 of file standby.c.

Referenced by GetStandbyLimitTime().