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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, RelFileLocator locator)
 
void ResolveRecoveryConflictWithSnapshotFullXid (FullTransactionId snapshotConflictHorizon, 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 vacuum_defer_cleanup_age
 
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 62 of file standby.h.

Typedef Documentation

◆ RunningTransactions

Definition at line 89 of file standby.h.

◆ RunningTransactionsData

Function Documentation

◆ CheckRecoveryConflictDeadlock()

void CheckRecoveryConflictDeadlock ( void  )

Definition at line 899 of file standby.c.

900 {
901  Assert(!InRecovery); /* do not call in Startup process */
902 
904  return;
905 
906  /*
907  * Error message should match ProcessInterrupts() but we avoid calling
908  * that because we aren't handling an interrupt at this point. Note that
909  * we only cancel the current transaction here, so if we are in a
910  * subtransaction and the pin is held by a parent, then the Startup
911  * process will continue to wait even though we have avoided deadlock.
912  */
913  ereport(ERROR,
915  errmsg("canceling statement due to conflict with recovery"),
916  errdetail("User transaction caused buffer deadlock with recovery.")));
917 }
bool HoldingBufferPinThatDelaysRecovery(void)
Definition: bufmgr.c:4380
int errdetail(const char *fmt,...)
Definition: elog.c:1079
int errcode(int sqlerrcode)
Definition: elog.c:735
int errmsg(const char *fmt,...)
Definition: elog.c:946
#define ERROR
Definition: elog.h:35
#define ereport(elevel,...)
Definition: elog.h:145
Assert(fmt[strlen(fmt) - 1] !='\n')
#define ERRCODE_T_R_DEADLOCK_DETECTED
Definition: pgbench.c:76
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:588
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:4476
struct xl_standby_lock xl_standby_lock
void SharedInvalBackendInit(bool sendOnly)
Definition: sinvaladt.c:266
LocalTransactionId GetNextLocalTransactionId(void)
Definition: sinvaladt.c:775
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:67
BackendId backendId
Definition: lock.h:66
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 1410 of file standby.c.

1411 {
1412  xl_standby_lock xlrec;
1413 
1414  xlrec.xid = GetCurrentTransactionId();
1415 
1416  xlrec.dbOid = dbOid;
1417  xlrec.relOid = relOid;
1418 
1419  LogAccessExclusiveLocks(1, &xlrec);
1421 }
static void LogAccessExclusiveLocks(int nlocks, xl_standby_lock *locks)
Definition: standby.c:1392
TransactionId xid
Definition: lockdefs.h:51
TransactionId GetCurrentTransactionId(void)
Definition: xact.c:444
int MyXactFlags
Definition: xact.c:135
#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 1427 of file standby.c.

1428 {
1429  /*
1430  * Ensure that a TransactionId has been assigned to this transaction, for
1431  * two reasons, both related to lock release on the standby. First, we
1432  * must assign an xid so that RecordTransactionCommit() and
1433  * RecordTransactionAbort() do not optimise away the transaction
1434  * completion record which recovery relies upon to release locks. It's a
1435  * hack, but for a corner case not worth adding code for into the main
1436  * commit path. Second, we must assign an xid before the lock is recorded
1437  * in shared memory, otherwise a concurrently executing
1438  * GetRunningTransactionLocks() might see a lock associated with an
1439  * InvalidTransactionId which we later assert cannot happen.
1440  */
1441  (void) GetCurrentTransactionId();
1442 }

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:1664
Datum now(PG_FUNCTION_ARGS)
Definition: timestamp.c:1537
int errdetail_log_plural(const char *fmt_singular, const char *fmt_plural, unsigned long n,...)
Definition: elog.c:1148
#define LOG
Definition: elog.h:27
#define VirtualTransactionIdIsValid(vxid)
Definition: lock.h:72
void pfree(void *pointer)
Definition: mcxt.c:1306
static char * buf
Definition: pg_test_fsync.c:67
PGPROC * BackendIdGetProc(int backendID)
Definition: sinvaladt.c:385
static const char * get_recovery_conflict_desc(ProcSignalReason reason)
Definition: standby.c:1471
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:91
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 1449 of file standby.c.

1451 {
1452  xl_invalidations xlrec;
1453 
1454  /* prepare record */
1455  memset(&xlrec, 0, sizeof(xlrec));
1456  xlrec.dbId = MyDatabaseId;
1457  xlrec.tsId = MyDatabaseTableSpace;
1458  xlrec.relcacheInitFileInval = relcacheInitFileInval;
1459  xlrec.nmsgs = nmsgs;
1460 
1461  /* perform insertion */
1462  XLogBeginInsert();
1463  XLogRegisterData((char *) (&xlrec), MinSizeOfInvalidations);
1464  XLogRegisterData((char *) msgs,
1465  nmsgs * sizeof(SharedInvalidationMessage));
1466  XLogInsert(RM_STANDBY_ID, XLOG_INVALIDATIONS);
1467 }
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:351
XLogRecPtr XLogInsert(RmgrId rmid, uint8 info)
Definition: xloginsert.c:451
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 1272 of file standby.c.

1273 {
1274  XLogRecPtr recptr;
1275  RunningTransactions running;
1276  xl_standby_lock *locks;
1277  int nlocks;
1278 
1280 
1281  /*
1282  * Get details of any AccessExclusiveLocks being held at the moment.
1283  */
1284  locks = GetRunningTransactionLocks(&nlocks);
1285  if (nlocks > 0)
1286  LogAccessExclusiveLocks(nlocks, locks);
1287  pfree(locks);
1288 
1289  /*
1290  * Log details of all in-progress transactions. This should be the last
1291  * record we write, because standby will open up when it sees this.
1292  */
1293  running = GetRunningTransactionData();
1294 
1295  /*
1296  * GetRunningTransactionData() acquired ProcArrayLock, we must release it.
1297  * For Hot Standby this can be done before inserting the WAL record
1298  * because ProcArrayApplyRecoveryInfo() rechecks the commit status using
1299  * the clog. For logical decoding, though, the lock can't be released
1300  * early because the clog might be "in the future" from the POV of the
1301  * historic snapshot. This would allow for situations where we're waiting
1302  * for the end of a transaction listed in the xl_running_xacts record
1303  * which, according to the WAL, has committed before the xl_running_xacts
1304  * record. Fortunately this routine isn't executed frequently, and it's
1305  * only a shared lock.
1306  */
1308  LWLockRelease(ProcArrayLock);
1309 
1310  recptr = LogCurrentRunningXacts(running);
1311 
1312  /* Release lock if we kept it longer ... */
1314  LWLockRelease(ProcArrayLock);
1315 
1316  /* GetRunningTransactionData() acquired XidGenLock, we must release it */
1317  LWLockRelease(XidGenLock);
1318 
1319  return recptr;
1320 }
xl_standby_lock * GetRunningTransactionLocks(int *nlocks)
Definition: lock.c:4018
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1802
RunningTransactions GetRunningTransactionData(void)
Definition: procarray.c:2729
static XLogRecPtr LogCurrentRunningXacts(RunningTransactions CurrRunningXacts)
Definition: standby.c:1332
int wal_level
Definition: xlog.c:134
@ WAL_LEVEL_LOGICAL
Definition: xlog.h:71
#define XLogStandbyInfoActive()
Definition: xlog.h:118
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(), ReplicationSlotReserveWal(), and SnapBuildWaitSnapshot().

◆ ResolveRecoveryConflictWithBufferPin()

void ResolveRecoveryConflictWithBufferPin ( void  )

Definition at line 787 of file standby.c.

788 {
789  TimestampTz ltime;
790 
792 
793  ltime = GetStandbyLimitTime();
794 
795  if (GetCurrentTimestamp() >= ltime && ltime != 0)
796  {
797  /*
798  * We're already behind, so clear a path as quickly as possible.
799  */
801  }
802  else
803  {
804  /*
805  * Wake up at ltime, and check for deadlocks as well if we will be
806  * waiting longer than deadlock_timeout
807  */
808  EnableTimeoutParams timeouts[2];
809  int cnt = 0;
810 
811  if (ltime != 0)
812  {
813  timeouts[cnt].id = STANDBY_TIMEOUT;
814  timeouts[cnt].type = TMPARAM_AT;
815  timeouts[cnt].fin_time = ltime;
816  cnt++;
817  }
818 
820  timeouts[cnt].id = STANDBY_DEADLOCK_TIMEOUT;
821  timeouts[cnt].type = TMPARAM_AFTER;
822  timeouts[cnt].delay_ms = DeadlockTimeout;
823  cnt++;
824 
825  enable_timeouts(timeouts, cnt);
826  }
827 
828  /*
829  * Wait to be signaled by UnpinBuffer() or for the wait to be interrupted
830  * by one of the timeouts established above.
831  *
832  * We assume that only UnpinBuffer() and the timeout requests established
833  * above can wake us up here. WakeupRecovery() called by walreceiver or
834  * SIGHUP signal handler, etc cannot do that because it uses the different
835  * latch from that ProcWaitForSignal() waits on.
836  */
838 
842  {
843  /*
844  * Send out a request for hot-standby backends to check themselves for
845  * deadlocks.
846  *
847  * XXX The subsequent ResolveRecoveryConflictWithBufferPin() will wait
848  * to be signaled by UnpinBuffer() again and send a request for
849  * deadlocks check if deadlock_timeout happens. This causes the
850  * request to continue to be sent every deadlock_timeout until the
851  * buffer is unpinned or ltime is reached. This would increase the
852  * workload in the startup process and backends. In practice it may
853  * not be so harmful because the period that the buffer is kept pinned
854  * is basically no so long. But we should fix this?
855  */
857  }
858 
859  /*
860  * Clear any timeout requests established above. We assume here that the
861  * Startup process doesn't have any other timeouts than what this function
862  * uses. If that stops being true, we could cancel the timeouts
863  * individually, but that'd be slower.
864  */
865  disable_all_timeouts(false);
868 }
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1573
int64 TimestampTz
Definition: timestamp.h:39
@ PROCSIG_RECOVERY_CONFLICT_BUFFERPIN
Definition: procsignal.h:44
@ PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK
Definition: procsignal.h:45
int DeadlockTimeout
Definition: proc.c:60
void ProcWaitForSignal(uint32 wait_event_info)
Definition: proc.c:1878
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:871
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 PG_WAIT_BUFFER_PIN
Definition: wait_event.h:20
#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, PG_WAIT_BUFFER_PIN, 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 563 of file standby.c.

564 {
565  /*
566  * We don't do ResolveRecoveryConflictWithVirtualXIDs() here since that
567  * only waits for transactions and completely idle sessions would block
568  * us. This is rare enough that we do this as simply as possible: no wait,
569  * just force them off immediately.
570  *
571  * No locking is required here because we already acquired
572  * AccessExclusiveLock. Anybody trying to connect while we do this will
573  * block during InitPostgres() and then disconnect when they see the
574  * database has been removed.
575  */
576  while (CountDBBackends(dbid) > 0)
577  {
579 
580  /*
581  * Wait awhile for them to die so that we avoid flooding an
582  * unresponsive backend when system is heavily loaded.
583  */
584  pg_usleep(10000);
585  }
586 }
void CancelDBBackends(Oid databaseid, ProcSignalReason sigmode, bool conflictPending)
Definition: procarray.c:3626
int CountDBBackends(Oid databaseid)
Definition: procarray.c:3565
@ PROCSIG_RECOVERY_CONFLICT_DATABASE
Definition: procsignal.h:40
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 617 of file standby.c.

618 {
619  TimestampTz ltime;
621 
623 
624  ltime = GetStandbyLimitTime();
626 
627  /*
628  * Update waitStart if first time through after the startup process
629  * started waiting for the lock. It should not be updated every time
630  * ResolveRecoveryConflictWithLock() is called during the wait.
631  *
632  * Use the current time obtained for comparison with ltime as waitStart
633  * (i.e., the time when this process started waiting for the lock). Since
634  * getting the current time newly can cause overhead, we reuse the
635  * already-obtained time to avoid that overhead.
636  *
637  * Note that waitStart is updated without holding the lock table's
638  * partition lock, to avoid the overhead by additional lock acquisition.
639  * This can cause "waitstart" in pg_locks to become NULL for a very short
640  * period of time after the wait started even though "granted" is false.
641  * This is OK in practice because we can assume that users are likely to
642  * look at "waitstart" when waiting for the lock for a long time.
643  */
644  if (pg_atomic_read_u64(&MyProc->waitStart) == 0)
646 
647  if (now >= ltime && ltime != 0)
648  {
649  /*
650  * We're already behind, so clear a path as quickly as possible.
651  */
652  VirtualTransactionId *backends;
653 
654  backends = GetLockConflicts(&locktag, AccessExclusiveLock, NULL);
655 
656  /*
657  * Prevent ResolveRecoveryConflictWithVirtualXIDs() from reporting
658  * "waiting" in PS display by disabling its argument report_waiting
659  * because the caller, WaitOnLock(), has already reported that.
660  */
663  PG_WAIT_LOCK | locktag.locktag_type,
664  false);
665  }
666  else
667  {
668  /*
669  * Wait (or wait again) until ltime, and check for deadlocks as well
670  * if we will be waiting longer than deadlock_timeout
671  */
672  EnableTimeoutParams timeouts[2];
673  int cnt = 0;
674 
675  if (ltime != 0)
676  {
677  got_standby_lock_timeout = false;
678  timeouts[cnt].id = STANDBY_LOCK_TIMEOUT;
679  timeouts[cnt].type = TMPARAM_AT;
680  timeouts[cnt].fin_time = ltime;
681  cnt++;
682  }
683 
685  timeouts[cnt].id = STANDBY_DEADLOCK_TIMEOUT;
686  timeouts[cnt].type = TMPARAM_AFTER;
687  timeouts[cnt].delay_ms = DeadlockTimeout;
688  cnt++;
689 
690  enable_timeouts(timeouts, cnt);
691  }
692 
693  /* Wait to be signaled by the release of the Relation Lock */
695 
696  /*
697  * Exit if ltime is reached. Then all the backends holding conflicting
698  * locks will be canceled in the next ResolveRecoveryConflictWithLock()
699  * call.
700  */
702  goto cleanup;
703 
705  {
706  VirtualTransactionId *backends;
707 
708  backends = GetLockConflicts(&locktag, AccessExclusiveLock, NULL);
709 
710  /* Quick exit if there's no work to be done */
711  if (!VirtualTransactionIdIsValid(*backends))
712  goto cleanup;
713 
714  /*
715  * Send signals to all the backends holding the conflicting locks, to
716  * ask them to check themselves for deadlocks.
717  */
718  while (VirtualTransactionIdIsValid(*backends))
719  {
720  SignalVirtualTransaction(*backends,
722  false);
723  backends++;
724  }
725 
726  /*
727  * Exit if the recovery conflict has not been logged yet even though
728  * logging is enabled, so that the caller can log that. Then
729  * RecoveryConflictWithLock() is called again and we will wait again
730  * for the lock to be released.
731  */
732  if (logging_conflict)
733  goto cleanup;
734 
735  /*
736  * Wait again here to be signaled by the release of the Relation Lock,
737  * to prevent the subsequent RecoveryConflictWithLock() from causing
738  * deadlock_timeout and sending a request for deadlocks check again.
739  * Otherwise the request continues to be sent every deadlock_timeout
740  * until the relation locks are released or ltime is reached.
741  */
744  }
745 
746 cleanup:
747 
748  /*
749  * Clear any timeout requests established above. We assume here that the
750  * Startup process doesn't have any other outstanding timeouts than those
751  * used by this function. If that stops being true, we could cancel the
752  * timeouts individually, but that'd be slower.
753  */
754  disable_all_timeouts(false);
755  got_standby_lock_timeout = false;
757 }
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:696
VirtualTransactionId * GetLockConflicts(const LOCKTAG *locktag, LOCKMODE lockmode, int *countp)
Definition: lock.c:2914
#define AccessExclusiveLock
Definition: lockdefs.h:43
pid_t SignalVirtualTransaction(VirtualTransactionId vxid, ProcSignalReason sigmode, bool conflictPending)
Definition: procarray.c:3463
@ PROCSIG_RECOVERY_CONFLICT_LOCK
Definition: procsignal.h:42
PGPROC * MyProc
Definition: proc.c:68
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:173
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,
RelFileLocator  locator 
)

Definition at line 477 of file standby.c.

479 {
480  VirtualTransactionId *backends;
481 
482  /*
483  * If we get passed InvalidTransactionId then we do nothing (no conflict).
484  *
485  * This can happen when replaying already-applied WAL records after a
486  * standby crash or restart, or when replaying an XLOG_HEAP2_VISIBLE
487  * record that marks as frozen a page which was already all-visible. It's
488  * also quite common with records generated during index deletion
489  * (original execution of the deletion can reason that a recovery conflict
490  * which is sufficient for the deletion operation must take place before
491  * replay of the deletion record itself).
492  */
493  if (!TransactionIdIsValid(snapshotConflictHorizon))
494  return;
495 
496  backends = GetConflictingVirtualXIDs(snapshotConflictHorizon,
497  locator.dbOid);
501  true);
502 }
VirtualTransactionId * GetConflictingVirtualXIDs(TransactionId limitXmin, Oid dbOid)
Definition: procarray.c:3383
@ PROCSIG_RECOVERY_CONFLICT_SNAPSHOT
Definition: procsignal.h:43
#define TransactionIdIsValid(xid)
Definition: transam.h:41
@ WAIT_EVENT_RECOVERY_CONFLICT_SNAPSHOT
Definition: wait_event.h:120

References RelFileLocator::dbOid, GetConflictingVirtualXIDs(), PROCSIG_RECOVERY_CONFLICT_SNAPSHOT, ResolveRecoveryConflictWithVirtualXIDs(), TransactionIdIsValid, and WAIT_EVENT_RECOVERY_CONFLICT_SNAPSHOT.

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,
RelFileLocator  locator 
)

Definition at line 509 of file standby.c.

511 {
512  /*
513  * ResolveRecoveryConflictWithSnapshot operates on 32-bit TransactionIds,
514  * so truncate the logged FullTransactionId. If the logged value is very
515  * old, so that XID wrap-around already happened on it, there can't be any
516  * snapshots that still see it.
517  */
519  uint64 diff;
520 
521  diff = U64FromFullTransactionId(nextXid) -
522  U64FromFullTransactionId(snapshotConflictHorizon);
523  if (diff < MaxTransactionId / 2)
524  {
525  TransactionId truncated;
526 
527  truncated = XidFromFullTransactionId(snapshotConflictHorizon);
528  ResolveRecoveryConflictWithSnapshot(truncated, locator);
529  }
530 }
void ResolveRecoveryConflictWithSnapshot(TransactionId snapshotConflictHorizon, RelFileLocator locator)
Definition: standby.c:477
#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 533 of file standby.c.

534 {
535  VirtualTransactionId *temp_file_users;
536 
537  /*
538  * Standby users may be currently using this tablespace for their
539  * temporary files. We only care about current users because
540  * temp_tablespace parameter will just ignore tablespaces that no longer
541  * exist.
542  *
543  * Ask everybody to cancel their queries immediately so we can ensure no
544  * temp files remain and we can remove the tablespace. Nuke the entire
545  * site from orbit, it's the only way to be sure.
546  *
547  * XXX: We could work out the pids of active backends using this
548  * tablespace by examining the temp filenames in the directory. We would
549  * then convert the pids into VirtualXIDs before attempting to cancel
550  * them.
551  *
552  * We don't wait for commit because drop tablespace is non-transactional.
553  */
555  InvalidOid);
559  true);
560 }
#define InvalidOid
Definition: postgres_ext.h:36
@ PROCSIG_RECOVERY_CONFLICT_TABLESPACE
Definition: procsignal.h:41
#define InvalidTransactionId
Definition: transam.h:31
@ WAIT_EVENT_RECOVERY_CONFLICT_TABLESPACE
Definition: wait_event.h:121

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

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:4499
void ExpireAllKnownAssignedTransactionIds(void)
Definition: procarray.c:4487
void StandbyReleaseAllLocks(void)
Definition: standby.c:1101

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 980 of file standby.c.

981 {
982  RecoveryLockXidEntry *xidentry;
983  RecoveryLockEntry *lockentry;
985  LOCKTAG locktag;
986  bool found;
987 
988  /* Already processed? */
989  if (!TransactionIdIsValid(xid) ||
990  TransactionIdDidCommit(xid) ||
992  return;
993 
995  "adding recovery lock: db %u rel %u", dbOid, relOid);
996 
997  /* dbOid is InvalidOid when we are locking a shared relation. */
998  Assert(OidIsValid(relOid));
999 
1000  /* Create a hash entry for this xid, if we don't have one already. */
1001  xidentry = hash_search(RecoveryLockXidHash, &xid, HASH_ENTER, &found);
1002  if (!found)
1003  {
1004  Assert(xidentry->xid == xid); /* dynahash should have set this */
1005  xidentry->head = NULL;
1006  }
1007 
1008  /* Create a hash entry for this lock, unless we have one already. */
1009  key.xid = xid;
1010  key.dbOid = dbOid;
1011  key.relOid = relOid;
1012  lockentry = hash_search(RecoveryLockHash, &key, HASH_ENTER, &found);
1013  if (!found)
1014  {
1015  /* It's new, so link it into the XID's list ... */
1016  lockentry->next = xidentry->head;
1017  xidentry->head = lockentry;
1018 
1019  /* ... and acquire the lock locally. */
1020  SET_LOCKTAG_RELATION(locktag, dbOid, relOid);
1021 
1022  (void) LockAcquire(&locktag, AccessExclusiveLock, true, false);
1023  }
1024 }
#define OidIsValid(objectId)
Definition: c.h:711
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:3626
#define DEBUG4
Definition: elog.h:23
@ HASH_ENTER
Definition: hsearch.h:114
LockAcquireResult LockAcquire(const LOCKTAG *locktag, LOCKMODE lockmode, bool sessionLock, bool dontWait)
Definition: lock.c:747
#define SET_LOCKTAG_RELATION(locktag, dboid, reloid)
Definition: lock.h:184
Definition: lock.h:168
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:125
bool TransactionIdDidAbort(TransactionId transactionId)
Definition: transam.c:181

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 930 of file standby.c.

931 {
933 }

References got_standby_deadlock_timeout.

Referenced by StartupProcessMain().

◆ StandbyLockTimeoutHandler()

void StandbyLockTimeoutHandler ( void  )

Definition at line 948 of file standby.c.

949 {
951 }

References got_standby_lock_timeout.

Referenced by StartupProcessMain().

◆ StandbyReleaseAllLocks()

void StandbyReleaseAllLocks ( void  )

Definition at line 1101 of file standby.c.

1102 {
1104  RecoveryLockXidEntry *entry;
1105 
1106  elog(trace_recovery(DEBUG2), "release all standby locks");
1107 
1109  while ((entry = hash_seq_search(&status)))
1110  {
1113  }
1114 }
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:25
@ HASH_REMOVE
Definition: hsearch.h:115
static void static void status(const char *fmt,...) pg_attribute_printf(1
Definition: pg_regress.c:225
static void StandbyReleaseXidEntryLocks(RecoveryLockXidEntry *xidentry)
Definition: standby.c:1030

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

Referenced by ShutdownRecoveryTransactionEnvironment(), and StandbyReleaseLocks().

◆ StandbyReleaseLockTree()

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

Definition at line 1087 of file standby.c.

1088 {
1089  int i;
1090 
1091  StandbyReleaseLocks(xid);
1092 
1093  for (i = 0; i < nsubxids; i++)
1094  StandbyReleaseLocks(subxids[i]);
1095 }
int i
Definition: isn.c:73
static void StandbyReleaseLocks(TransactionId xid)
Definition: standby.c:1063

References i, and StandbyReleaseLocks().

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

◆ StandbyReleaseOldLocks()

void StandbyReleaseOldLocks ( TransactionId  oldxid)

Definition at line 1122 of file standby.c.

1123 {
1125  RecoveryLockXidEntry *entry;
1126 
1128  while ((entry = hash_seq_search(&status)))
1129  {
1130  Assert(TransactionIdIsValid(entry->xid));
1131 
1132  /* Skip if prepared transaction. */
1133  if (StandbyTransactionIdIsPrepared(entry->xid))
1134  continue;
1135 
1136  /* Skip if >= oldxid. */
1137  if (!TransactionIdPrecedes(entry->xid, oldxid))
1138  continue;
1139 
1140  /* Remove all locks and hash table entry. */
1143  }
1144 }
bool TransactionIdPrecedes(TransactionId id1, TransactionId id2)
Definition: transam.c:273
bool StandbyTransactionIdIsPrepared(TransactionId xid)
Definition: twophase.c:1452

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

Referenced by ProcArrayApplyRecoveryInfo().

◆ StandbyTimeoutHandler()

void StandbyTimeoutHandler ( void  )

Definition at line 939 of file standby.c.

940 {
942 }

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().

◆ vacuum_defer_cleanup_age

PGDLLIMPORT int vacuum_defer_cleanup_age
extern

Definition at line 40 of file standby.c.

Referenced by ComputeXidHorizons(), and GetSnapshotData().