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standby.c File Reference
#include "postgres.h"
#include "access/transam.h"
#include "access/twophase.h"
#include "access/xact.h"
#include "access/xloginsert.h"
#include "access/xlogrecovery.h"
#include "access/xlogutils.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "replication/slot.h"
#include "storage/bufmgr.h"
#include "storage/proc.h"
#include "storage/procarray.h"
#include "storage/sinvaladt.h"
#include "storage/standby.h"
#include "utils/hsearch.h"
#include "utils/ps_status.h"
#include "utils/timeout.h"
#include "utils/timestamp.h"
Include dependency graph for standby.c:

Go to the source code of this file.

Data Structures

struct  RecoveryLockEntry
 
struct  RecoveryLockXidEntry
 

Macros

#define STANDBY_INITIAL_WAIT_US   1000
 

Typedefs

typedef struct RecoveryLockEntry RecoveryLockEntry
 
typedef struct RecoveryLockXidEntry RecoveryLockXidEntry
 

Functions

static void ResolveRecoveryConflictWithVirtualXIDs (VirtualTransactionId *waitlist, ProcSignalReason reason, uint32 wait_event_info, bool report_waiting)
 
static void SendRecoveryConflictWithBufferPin (ProcSignalReason reason)
 
static XLogRecPtr LogCurrentRunningXacts (RunningTransactions CurrRunningXacts)
 
static void LogAccessExclusiveLocks (int nlocks, xl_standby_lock *locks)
 
static const char * get_recovery_conflict_desc (ProcSignalReason reason)
 
void InitRecoveryTransactionEnvironment (void)
 
void ShutdownRecoveryTransactionEnvironment (void)
 
static TimestampTz GetStandbyLimitTime (void)
 
static bool WaitExceedsMaxStandbyDelay (uint32 wait_event_info)
 
void LogRecoveryConflict (ProcSignalReason reason, TimestampTz wait_start, TimestampTz now, VirtualTransactionId *wait_list, bool still_waiting)
 
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 StandbyAcquireAccessExclusiveLock (TransactionId xid, Oid dbOid, Oid relOid)
 
static void StandbyReleaseXidEntryLocks (RecoveryLockXidEntry *xidentry)
 
static void StandbyReleaseLocks (TransactionId xid)
 
void StandbyReleaseLockTree (TransactionId xid, int nsubxids, TransactionId *subxids)
 
void StandbyReleaseAllLocks (void)
 
void StandbyReleaseOldLocks (TransactionId oldxid)
 
void standby_redo (XLogReaderState *record)
 
XLogRecPtr LogStandbySnapshot (void)
 
void LogAccessExclusiveLock (Oid dbOid, Oid relOid)
 
void LogAccessExclusiveLockPrepare (void)
 
void LogStandbyInvalidations (int nmsgs, SharedInvalidationMessage *msgs, bool relcacheInitFileInval)
 

Variables

int max_standby_archive_delay = 30 * 1000
 
int max_standby_streaming_delay = 30 * 1000
 
bool log_recovery_conflict_waits = false
 
static HTABRecoveryLockHash = NULL
 
static HTABRecoveryLockXidHash = NULL
 
static volatile sig_atomic_t got_standby_deadlock_timeout = false
 
static volatile sig_atomic_t got_standby_delay_timeout = false
 
static volatile sig_atomic_t got_standby_lock_timeout = false
 
static int standbyWait_us = STANDBY_INITIAL_WAIT_US
 

Macro Definition Documentation

◆ STANDBY_INITIAL_WAIT_US

#define STANDBY_INITIAL_WAIT_US   1000

Definition at line 224 of file standby.c.

Typedef Documentation

◆ RecoveryLockEntry

◆ RecoveryLockXidEntry

Function Documentation

◆ CheckRecoveryConflictDeadlock()

void CheckRecoveryConflictDeadlock ( void  )

Definition at line 904 of file standby.c.

905{
906 Assert(!InRecovery); /* do not call in Startup process */
907
909 return;
910
911 /*
912 * Error message should match ProcessInterrupts() but we avoid calling
913 * that because we aren't handling an interrupt at this point. Note that
914 * we only cancel the current transaction here, so if we are in a
915 * subtransaction and the pin is held by a parent, then the Startup
916 * process will continue to wait even though we have avoided deadlock.
917 */
920 errmsg("canceling statement due to conflict with recovery"),
921 errdetail("User transaction caused buffer deadlock with recovery.")));
922}
bool HoldingBufferPinThatDelaysRecovery(void)
Definition: bufmgr.c:5373
#define Assert(condition)
Definition: c.h:812
int errdetail(const char *fmt,...)
Definition: elog.c:1203
int errcode(int sqlerrcode)
Definition: elog.c:853
int errmsg(const char *fmt,...)
Definition: elog.c:1070
#define ERROR
Definition: elog.h:39
#define ereport(elevel,...)
Definition: elog.h:149
#define ERRCODE_T_R_DEADLOCK_DETECTED
Definition: pgbench.c:77
bool InRecovery
Definition: xlogutils.c:50

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

Referenced by ProcSleep().

◆ get_recovery_conflict_desc()

static const char * get_recovery_conflict_desc ( ProcSignalReason  reason)
static

Definition at line 1480 of file standby.c.

1481{
1482 const char *reasonDesc = _("unknown reason");
1483
1484 switch (reason)
1485 {
1487 reasonDesc = _("recovery conflict on buffer pin");
1488 break;
1490 reasonDesc = _("recovery conflict on lock");
1491 break;
1493 reasonDesc = _("recovery conflict on tablespace");
1494 break;
1496 reasonDesc = _("recovery conflict on snapshot");
1497 break;
1499 reasonDesc = _("recovery conflict on replication slot");
1500 break;
1502 reasonDesc = _("recovery conflict on buffer deadlock");
1503 break;
1505 reasonDesc = _("recovery conflict on database");
1506 break;
1507 default:
1508 break;
1509 }
1510
1511 return reasonDesc;
1512}
#define _(x)
Definition: elog.c:90
@ PROCSIG_RECOVERY_CONFLICT_BUFFERPIN
Definition: procsignal.h:47
@ PROCSIG_RECOVERY_CONFLICT_LOCK
Definition: procsignal.h:44
@ PROCSIG_RECOVERY_CONFLICT_LOGICALSLOT
Definition: procsignal.h:46
@ PROCSIG_RECOVERY_CONFLICT_DATABASE
Definition: procsignal.h:42
@ PROCSIG_RECOVERY_CONFLICT_SNAPSHOT
Definition: procsignal.h:45
@ PROCSIG_RECOVERY_CONFLICT_TABLESPACE
Definition: procsignal.h:43
@ PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK
Definition: procsignal.h:48

References _, PROCSIG_RECOVERY_CONFLICT_BUFFERPIN, PROCSIG_RECOVERY_CONFLICT_DATABASE, PROCSIG_RECOVERY_CONFLICT_LOCK, PROCSIG_RECOVERY_CONFLICT_LOGICALSLOT, PROCSIG_RECOVERY_CONFLICT_SNAPSHOT, PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK, and PROCSIG_RECOVERY_CONFLICT_TABLESPACE.

Referenced by LogRecoveryConflict().

◆ GetStandbyLimitTime()

static TimestampTz GetStandbyLimitTime ( void  )
static

Definition at line 200 of file standby.c.

201{
202 TimestampTz rtime;
203 bool fromStream;
204
205 /*
206 * The cutoff time is the last WAL data receipt time plus the appropriate
207 * delay variable. Delay of -1 means wait forever.
208 */
209 GetXLogReceiptTime(&rtime, &fromStream);
210 if (fromStream)
211 {
213 return 0; /* wait forever */
215 }
216 else
217 {
219 return 0; /* wait forever */
221 }
222}
int64 TimestampTz
Definition: timestamp.h:39
int max_standby_archive_delay
Definition: standby.c:39
int max_standby_streaming_delay
Definition: standby.c:40
#define TimestampTzPlusMilliseconds(tz, ms)
Definition: timestamp.h:85
void GetXLogReceiptTime(TimestampTz *rtime, bool *fromStream)

References GetXLogReceiptTime(), max_standby_archive_delay, max_standby_streaming_delay, and TimestampTzPlusMilliseconds.

Referenced by ResolveRecoveryConflictWithBufferPin(), ResolveRecoveryConflictWithLock(), and WaitExceedsMaxStandbyDelay().

◆ InitRecoveryTransactionEnvironment()

void InitRecoveryTransactionEnvironment ( void  )

Definition at line 94 of file standby.c.

95{
97 HASHCTL hash_ctl;
98
99 Assert(RecoveryLockHash == NULL); /* don't run this twice */
100
101 /*
102 * Initialize the hash tables for tracking the locks held by each
103 * transaction.
104 */
105 hash_ctl.keysize = sizeof(xl_standby_lock);
106 hash_ctl.entrysize = sizeof(RecoveryLockEntry);
107 RecoveryLockHash = hash_create("RecoveryLockHash",
108 64,
109 &hash_ctl,
111 hash_ctl.keysize = sizeof(TransactionId);
112 hash_ctl.entrysize = sizeof(RecoveryLockXidEntry);
113 RecoveryLockXidHash = hash_create("RecoveryLockXidHash",
114 64,
115 &hash_ctl,
117
118 /*
119 * Initialize shared invalidation management for Startup process, being
120 * careful to register ourselves as a sendOnly process so we don't need to
121 * read messages, nor will we get signaled when the queue starts filling
122 * up.
123 */
125
126 /*
127 * Lock a virtual transaction id for Startup process.
128 *
129 * We need to do GetNextLocalTransactionId() because
130 * SharedInvalBackendInit() leaves localTransactionId invalid and the lock
131 * manager doesn't like that at all.
132 *
133 * Note that we don't need to run XactLockTableInsert() because nobody
134 * needs to wait on xids. That sounds a little strange, but table locks
135 * are held by vxids and row level locks are held by xids. All queries
136 * hold AccessShareLocks so never block while we write or lock new rows.
137 */
142
144}
uint32 TransactionId
Definition: c.h:606
HTAB * hash_create(const char *tabname, long nelem, const HASHCTL *info, int flags)
Definition: dynahash.c:352
ProcNumber MyProcNumber
Definition: globals.c:89
#define HASH_ELEM
Definition: hsearch.h:95
#define HASH_BLOBS
Definition: hsearch.h:97
void VirtualXactLockTableInsert(VirtualTransactionId vxid)
Definition: lock.c:4527
struct xl_standby_lock xl_standby_lock
void SharedInvalBackendInit(bool sendOnly)
Definition: sinvaladt.c:271
LocalTransactionId GetNextLocalTransactionId(void)
Definition: sinvaladt.c:700
PGPROC * MyProc
Definition: proc.c:66
static HTAB * RecoveryLockXidHash
Definition: standby.c:65
struct RecoveryLockEntry RecoveryLockEntry
struct RecoveryLockXidEntry RecoveryLockXidEntry
static HTAB * RecoveryLockHash
Definition: standby.c:64
Size keysize
Definition: hsearch.h:75
Size entrysize
Definition: hsearch.h:76
struct PGPROC::@123 vxid
ProcNumber procNumber
Definition: proc.h:195
LocalTransactionId localTransactionId
Definition: lock.h:62
ProcNumber procNumber
Definition: lock.h:61
HotStandbyState standbyState
Definition: xlogutils.c:53
@ STANDBY_INITIALIZED
Definition: xlogutils.h:53

References Assert, HASHCTL::entrysize, GetNextLocalTransactionId(), HASH_BLOBS, hash_create(), HASH_ELEM, HASHCTL::keysize, VirtualTransactionId::localTransactionId, MyProc, MyProcNumber, VirtualTransactionId::procNumber, PGPROC::procNumber, RecoveryLockHash, RecoveryLockXidHash, SharedInvalBackendInit(), STANDBY_INITIALIZED, standbyState, VirtualXactLockTableInsert(), and PGPROC::vxid.

Referenced by StartupXLOG().

◆ LogAccessExclusiveLock()

void LogAccessExclusiveLock ( Oid  dbOid,
Oid  relOid 
)

Definition at line 1419 of file standby.c.

1420{
1421 xl_standby_lock xlrec;
1422
1423 xlrec.xid = GetCurrentTransactionId();
1424
1425 xlrec.dbOid = dbOid;
1426 xlrec.relOid = relOid;
1427
1428 LogAccessExclusiveLocks(1, &xlrec);
1430}
static void LogAccessExclusiveLocks(int nlocks, xl_standby_lock *locks)
Definition: standby.c:1401
TransactionId xid
Definition: lockdefs.h:53
TransactionId GetCurrentTransactionId(void)
Definition: xact.c:453
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 1436 of file standby.c.

1437{
1438 /*
1439 * Ensure that a TransactionId has been assigned to this transaction, for
1440 * two reasons, both related to lock release on the standby. First, we
1441 * must assign an xid so that RecordTransactionCommit() and
1442 * RecordTransactionAbort() do not optimise away the transaction
1443 * completion record which recovery relies upon to release locks. It's a
1444 * hack, but for a corner case not worth adding code for into the main
1445 * commit path. Second, we must assign an xid before the lock is recorded
1446 * in shared memory, otherwise a concurrently executing
1447 * GetRunningTransactionLocks() might see a lock associated with an
1448 * InvalidTransactionId which we later assert cannot happen.
1449 */
1450 (void) GetCurrentTransactionId();
1451}

References GetCurrentTransactionId().

Referenced by LockAcquireExtended().

◆ LogAccessExclusiveLocks()

static void LogAccessExclusiveLocks ( int  nlocks,
xl_standby_lock locks 
)
static

Definition at line 1401 of file standby.c.

1402{
1403 xl_standby_locks xlrec;
1404
1405 xlrec.nlocks = nlocks;
1406
1408 XLogRegisterData((char *) &xlrec, offsetof(xl_standby_locks, locks));
1409 XLogRegisterData((char *) locks, nlocks * sizeof(xl_standby_lock));
1411
1412 (void) XLogInsert(RM_STANDBY_ID, XLOG_STANDBY_LOCK);
1413}
#define XLOG_STANDBY_LOCK
Definition: standbydefs.h:34
#define XLOG_MARK_UNIMPORTANT
Definition: xlog.h:155
XLogRecPtr XLogInsert(RmgrId rmid, uint8 info)
Definition: xloginsert.c:474
void XLogSetRecordFlags(uint8 flags)
Definition: xloginsert.c:456
void XLogRegisterData(const char *data, uint32 len)
Definition: xloginsert.c:364
void XLogBeginInsert(void)
Definition: xloginsert.c:149

References xl_standby_locks::nlocks, XLOG_MARK_UNIMPORTANT, XLOG_STANDBY_LOCK, XLogBeginInsert(), XLogInsert(), XLogRegisterData(), and XLogSetRecordFlags().

Referenced by LogAccessExclusiveLock(), and LogStandbySnapshot().

◆ LogCurrentRunningXacts()

static XLogRecPtr LogCurrentRunningXacts ( RunningTransactions  CurrRunningXacts)
static

Definition at line 1341 of file standby.c.

1342{
1343 xl_running_xacts xlrec;
1344 XLogRecPtr recptr;
1345
1346 xlrec.xcnt = CurrRunningXacts->xcnt;
1347 xlrec.subxcnt = CurrRunningXacts->subxcnt;
1348 xlrec.subxid_overflow = (CurrRunningXacts->subxid_status != SUBXIDS_IN_ARRAY);
1349 xlrec.nextXid = CurrRunningXacts->nextXid;
1350 xlrec.oldestRunningXid = CurrRunningXacts->oldestRunningXid;
1351 xlrec.latestCompletedXid = CurrRunningXacts->latestCompletedXid;
1352
1353 /* Header */
1356 XLogRegisterData((char *) (&xlrec), MinSizeOfXactRunningXacts);
1357
1358 /* array of TransactionIds */
1359 if (xlrec.xcnt > 0)
1360 XLogRegisterData((char *) CurrRunningXacts->xids,
1361 (xlrec.xcnt + xlrec.subxcnt) * sizeof(TransactionId));
1362
1363 recptr = XLogInsert(RM_STANDBY_ID, XLOG_RUNNING_XACTS);
1364
1365 if (xlrec.subxid_overflow)
1366 elog(DEBUG2,
1367 "snapshot of %d running transactions overflowed (lsn %X/%X oldest xid %u latest complete %u next xid %u)",
1368 CurrRunningXacts->xcnt,
1369 LSN_FORMAT_ARGS(recptr),
1370 CurrRunningXacts->oldestRunningXid,
1371 CurrRunningXacts->latestCompletedXid,
1372 CurrRunningXacts->nextXid);
1373 else
1374 elog(DEBUG2,
1375 "snapshot of %d+%d running transaction ids (lsn %X/%X oldest xid %u latest complete %u next xid %u)",
1376 CurrRunningXacts->xcnt, CurrRunningXacts->subxcnt,
1377 LSN_FORMAT_ARGS(recptr),
1378 CurrRunningXacts->oldestRunningXid,
1379 CurrRunningXacts->latestCompletedXid,
1380 CurrRunningXacts->nextXid);
1381
1382 /*
1383 * Ensure running_xacts information is synced to disk not too far in the
1384 * future. We don't want to stall anything though (i.e. use XLogFlush()),
1385 * so we let the wal writer do it during normal operation.
1386 * XLogSetAsyncXactLSN() conveniently will mark the LSN as to-be-synced
1387 * and nudge the WALWriter into action if sleeping. Check
1388 * XLogBackgroundFlush() for details why a record might not be flushed
1389 * without it.
1390 */
1391 XLogSetAsyncXactLSN(recptr);
1392
1393 return recptr;
1394}
#define DEBUG2
Definition: elog.h:29
#define elog(elevel,...)
Definition: elog.h:225
#define MinSizeOfXactRunningXacts
Definition: standby.h:63
@ SUBXIDS_IN_ARRAY
Definition: standby.h:80
#define XLOG_RUNNING_XACTS
Definition: standbydefs.h:35
TransactionId oldestRunningXid
Definition: standby.h:92
TransactionId nextXid
Definition: standby.h:91
TransactionId latestCompletedXid
Definition: standby.h:95
subxids_array_status subxid_status
Definition: standby.h:90
TransactionId * xids
Definition: standby.h:97
TransactionId latestCompletedXid
Definition: standbydefs.h:54
TransactionId oldestRunningXid
Definition: standbydefs.h:53
TransactionId nextXid
Definition: standbydefs.h:52
void XLogSetAsyncXactLSN(XLogRecPtr asyncXactLSN)
Definition: xlog.c:2631
#define LSN_FORMAT_ARGS(lsn)
Definition: xlogdefs.h:43
uint64 XLogRecPtr
Definition: xlogdefs.h:21

References DEBUG2, elog, RunningTransactionsData::latestCompletedXid, xl_running_xacts::latestCompletedXid, LSN_FORMAT_ARGS, MinSizeOfXactRunningXacts, RunningTransactionsData::nextXid, xl_running_xacts::nextXid, RunningTransactionsData::oldestRunningXid, xl_running_xacts::oldestRunningXid, RunningTransactionsData::subxcnt, xl_running_xacts::subxcnt, xl_running_xacts::subxid_overflow, RunningTransactionsData::subxid_status, SUBXIDS_IN_ARRAY, RunningTransactionsData::xcnt, xl_running_xacts::xcnt, RunningTransactionsData::xids, XLOG_MARK_UNIMPORTANT, XLOG_RUNNING_XACTS, XLogBeginInsert(), XLogInsert(), XLogRegisterData(), XLogSetAsyncXactLSN(), and XLogSetRecordFlags().

Referenced by LogStandbySnapshot().

◆ LogRecoveryConflict()

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

Definition at line 273 of file standby.c.

276{
277 long secs;
278 int usecs;
279 long msecs;
281 int nprocs = 0;
282
283 /*
284 * There must be no conflicting processes when the recovery conflict has
285 * already been resolved.
286 */
287 Assert(still_waiting || wait_list == NULL);
288
289 TimestampDifference(wait_start, now, &secs, &usecs);
290 msecs = secs * 1000 + usecs / 1000;
291 usecs = usecs % 1000;
292
293 if (wait_list)
294 {
296
297 /* Construct a string of list of the conflicting processes */
298 vxids = wait_list;
299 while (VirtualTransactionIdIsValid(*vxids))
300 {
301 PGPROC *proc = ProcNumberGetProc(vxids->procNumber);
302
303 /* proc can be NULL if the target backend is not active */
304 if (proc)
305 {
306 if (nprocs == 0)
307 {
309 appendStringInfo(&buf, "%d", proc->pid);
310 }
311 else
312 appendStringInfo(&buf, ", %d", proc->pid);
313
314 nprocs++;
315 }
316
317 vxids++;
318 }
319 }
320
321 /*
322 * If wait_list is specified, report the list of PIDs of active
323 * conflicting backends in a detail message. Note that if all the backends
324 * in the list are not active, no detail message is logged.
325 */
326 if (still_waiting)
327 {
328 ereport(LOG,
329 errmsg("recovery still waiting after %ld.%03d ms: %s",
330 msecs, usecs, get_recovery_conflict_desc(reason)),
331 nprocs > 0 ? errdetail_log_plural("Conflicting process: %s.",
332 "Conflicting processes: %s.",
333 nprocs, buf.data) : 0);
334 }
335 else
336 {
337 ereport(LOG,
338 errmsg("recovery finished waiting after %ld.%03d ms: %s",
339 msecs, usecs, get_recovery_conflict_desc(reason)));
340 }
341
342 if (nprocs > 0)
343 pfree(buf.data);
344}
void TimestampDifference(TimestampTz start_time, TimestampTz stop_time, long *secs, int *microsecs)
Definition: timestamp.c:1720
Datum now(PG_FUNCTION_ARGS)
Definition: timestamp.c:1608
int errdetail_log_plural(const char *fmt_singular, const char *fmt_plural, unsigned long n,...)
Definition: elog.c:1272
#define LOG
Definition: elog.h:31
#define VirtualTransactionIdIsValid(vxid)
Definition: lock.h:67
void pfree(void *pointer)
Definition: mcxt.c:1521
static char * buf
Definition: pg_test_fsync.c:72
PGPROC * ProcNumberGetProc(ProcNumber procNumber)
Definition: procarray.c:3138
static const char * get_recovery_conflict_desc(ProcSignalReason reason)
Definition: standby.c:1480
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:94
void initStringInfo(StringInfo str)
Definition: stringinfo.c:56
Definition: proc.h:162
int pid
Definition: proc.h:182

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

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

◆ LogStandbyInvalidations()

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

Definition at line 1458 of file standby.c.

1460{
1461 xl_invalidations xlrec;
1462
1463 /* prepare record */
1464 memset(&xlrec, 0, sizeof(xlrec));
1465 xlrec.dbId = MyDatabaseId;
1466 xlrec.tsId = MyDatabaseTableSpace;
1467 xlrec.relcacheInitFileInval = relcacheInitFileInval;
1468 xlrec.nmsgs = nmsgs;
1469
1470 /* perform insertion */
1472 XLogRegisterData((char *) (&xlrec), MinSizeOfInvalidations);
1473 XLogRegisterData((char *) msgs,
1474 nmsgs * sizeof(SharedInvalidationMessage));
1475 XLogInsert(RM_STANDBY_ID, XLOG_INVALIDATIONS);
1476}
Oid MyDatabaseTableSpace
Definition: globals.c:95
Oid MyDatabaseId
Definition: globals.c:93
#define XLOG_INVALIDATIONS
Definition: standbydefs.h:36
#define MinSizeOfInvalidations
Definition: standbydefs.h:72
bool relcacheInitFileInval
Definition: standbydefs.h:67

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 1281 of file standby.c.

1282{
1283 XLogRecPtr recptr;
1284 RunningTransactions running;
1285 xl_standby_lock *locks;
1286 int nlocks;
1287
1289
1290 /*
1291 * Get details of any AccessExclusiveLocks being held at the moment.
1292 */
1293 locks = GetRunningTransactionLocks(&nlocks);
1294 if (nlocks > 0)
1295 LogAccessExclusiveLocks(nlocks, locks);
1296 pfree(locks);
1297
1298 /*
1299 * Log details of all in-progress transactions. This should be the last
1300 * record we write, because standby will open up when it sees this.
1301 */
1302 running = GetRunningTransactionData();
1303
1304 /*
1305 * GetRunningTransactionData() acquired ProcArrayLock, we must release it.
1306 * For Hot Standby this can be done before inserting the WAL record
1307 * because ProcArrayApplyRecoveryInfo() rechecks the commit status using
1308 * the clog. For logical decoding, though, the lock can't be released
1309 * early because the clog might be "in the future" from the POV of the
1310 * historic snapshot. This would allow for situations where we're waiting
1311 * for the end of a transaction listed in the xl_running_xacts record
1312 * which, according to the WAL, has committed before the xl_running_xacts
1313 * record. Fortunately this routine isn't executed frequently, and it's
1314 * only a shared lock.
1315 */
1317 LWLockRelease(ProcArrayLock);
1318
1319 recptr = LogCurrentRunningXacts(running);
1320
1321 /* Release lock if we kept it longer ... */
1323 LWLockRelease(ProcArrayLock);
1324
1325 /* GetRunningTransactionData() acquired XidGenLock, we must release it */
1326 LWLockRelease(XidGenLock);
1327
1328 return recptr;
1329}
xl_standby_lock * GetRunningTransactionLocks(int *nlocks)
Definition: lock.c:4078
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1781
RunningTransactions GetRunningTransactionData(void)
Definition: procarray.c:2689
static XLogRecPtr LogCurrentRunningXacts(RunningTransactions CurrRunningXacts)
Definition: standby.c:1341
int wal_level
Definition: xlog.c:131
@ WAL_LEVEL_LOGICAL
Definition: xlog.h:76
#define XLogStandbyInfoActive()
Definition: xlog.h:123

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 792 of file standby.c.

793{
794 TimestampTz ltime;
795
797
798 ltime = GetStandbyLimitTime();
799
800 if (GetCurrentTimestamp() >= ltime && ltime != 0)
801 {
802 /*
803 * We're already behind, so clear a path as quickly as possible.
804 */
806 }
807 else
808 {
809 /*
810 * Wake up at ltime, and check for deadlocks as well if we will be
811 * waiting longer than deadlock_timeout
812 */
813 EnableTimeoutParams timeouts[2];
814 int cnt = 0;
815
816 if (ltime != 0)
817 {
818 timeouts[cnt].id = STANDBY_TIMEOUT;
819 timeouts[cnt].type = TMPARAM_AT;
820 timeouts[cnt].fin_time = ltime;
821 cnt++;
822 }
823
825 timeouts[cnt].id = STANDBY_DEADLOCK_TIMEOUT;
826 timeouts[cnt].type = TMPARAM_AFTER;
827 timeouts[cnt].delay_ms = DeadlockTimeout;
828 cnt++;
829
830 enable_timeouts(timeouts, cnt);
831 }
832
833 /*
834 * Wait to be signaled by UnpinBuffer() or for the wait to be interrupted
835 * by one of the timeouts established above.
836 *
837 * We assume that only UnpinBuffer() and the timeout requests established
838 * above can wake us up here. WakeupRecovery() called by walreceiver or
839 * SIGHUP signal handler, etc cannot do that because it uses the different
840 * latch from that ProcWaitForSignal() waits on.
841 */
842 ProcWaitForSignal(WAIT_EVENT_BUFFER_PIN);
843
847 {
848 /*
849 * Send out a request for hot-standby backends to check themselves for
850 * deadlocks.
851 *
852 * XXX The subsequent ResolveRecoveryConflictWithBufferPin() will wait
853 * to be signaled by UnpinBuffer() again and send a request for
854 * deadlocks check if deadlock_timeout happens. This causes the
855 * request to continue to be sent every deadlock_timeout until the
856 * buffer is unpinned or ltime is reached. This would increase the
857 * workload in the startup process and backends. In practice it may
858 * not be so harmful because the period that the buffer is kept pinned
859 * is basically no so long. But we should fix this?
860 */
862 }
863
864 /*
865 * Clear any timeout requests established above. We assume here that the
866 * Startup process doesn't have any other timeouts than what this function
867 * uses. If that stops being true, we could cancel the timeouts
868 * individually, but that'd be slower.
869 */
873}
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1644
int DeadlockTimeout
Definition: proc.c:57
void ProcWaitForSignal(uint32 wait_event_info)
Definition: proc.c:1896
static volatile sig_atomic_t got_standby_deadlock_timeout
Definition: standby.c:68
static TimestampTz GetStandbyLimitTime(void)
Definition: standby.c:200
static volatile sig_atomic_t got_standby_delay_timeout
Definition: standby.c:69
static void SendRecoveryConflictWithBufferPin(ProcSignalReason reason)
Definition: standby.c:876
TimeoutType type
Definition: timeout.h:61
TimestampTz fin_time
Definition: timeout.h:63
TimeoutId id
Definition: timeout.h:60
void disable_all_timeouts(bool keep_indicators)
Definition: timeout.c:751
void enable_timeouts(const EnableTimeoutParams *timeouts, int count)
Definition: timeout.c:630
@ STANDBY_DEADLOCK_TIMEOUT
Definition: timeout.h:30
@ STANDBY_TIMEOUT
Definition: timeout.h:31
@ TMPARAM_AT
Definition: timeout.h:54
@ TMPARAM_AFTER
Definition: timeout.h:53
#define InHotStandby
Definition: xlogutils.h:60

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 568 of file standby.c.

569{
570 /*
571 * We don't do ResolveRecoveryConflictWithVirtualXIDs() here since that
572 * only waits for transactions and completely idle sessions would block
573 * us. This is rare enough that we do this as simply as possible: no wait,
574 * just force them off immediately.
575 *
576 * No locking is required here because we already acquired
577 * AccessExclusiveLock. Anybody trying to connect while we do this will
578 * block during InitPostgres() and then disconnect when they see the
579 * database has been removed.
580 */
581 while (CountDBBackends(dbid) > 0)
582 {
584
585 /*
586 * Wait awhile for them to die so that we avoid flooding an
587 * unresponsive backend when system is heavily loaded.
588 */
589 pg_usleep(10000);
590 }
591}
void CancelDBBackends(Oid databaseid, ProcSignalReason sigmode, bool conflictPending)
Definition: procarray.c:3659
int CountDBBackends(Oid databaseid)
Definition: procarray.c:3599
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 622 of file standby.c.

623{
624 TimestampTz ltime;
626
628
629 ltime = GetStandbyLimitTime();
631
632 /*
633 * Update waitStart if first time through after the startup process
634 * started waiting for the lock. It should not be updated every time
635 * ResolveRecoveryConflictWithLock() is called during the wait.
636 *
637 * Use the current time obtained for comparison with ltime as waitStart
638 * (i.e., the time when this process started waiting for the lock). Since
639 * getting the current time newly can cause overhead, we reuse the
640 * already-obtained time to avoid that overhead.
641 *
642 * Note that waitStart is updated without holding the lock table's
643 * partition lock, to avoid the overhead by additional lock acquisition.
644 * This can cause "waitstart" in pg_locks to become NULL for a very short
645 * period of time after the wait started even though "granted" is false.
646 * This is OK in practice because we can assume that users are likely to
647 * look at "waitstart" when waiting for the lock for a long time.
648 */
651
652 if (now >= ltime && ltime != 0)
653 {
654 /*
655 * We're already behind, so clear a path as quickly as possible.
656 */
657 VirtualTransactionId *backends;
658
659 backends = GetLockConflicts(&locktag, AccessExclusiveLock, NULL);
660
661 /*
662 * Prevent ResolveRecoveryConflictWithVirtualXIDs() from reporting
663 * "waiting" in PS display by disabling its argument report_waiting
664 * because the caller, WaitOnLock(), has already reported that.
665 */
668 PG_WAIT_LOCK | locktag.locktag_type,
669 false);
670 }
671 else
672 {
673 /*
674 * Wait (or wait again) until ltime, and check for deadlocks as well
675 * if we will be waiting longer than deadlock_timeout
676 */
677 EnableTimeoutParams timeouts[2];
678 int cnt = 0;
679
680 if (ltime != 0)
681 {
683 timeouts[cnt].id = STANDBY_LOCK_TIMEOUT;
684 timeouts[cnt].type = TMPARAM_AT;
685 timeouts[cnt].fin_time = ltime;
686 cnt++;
687 }
688
690 timeouts[cnt].id = STANDBY_DEADLOCK_TIMEOUT;
691 timeouts[cnt].type = TMPARAM_AFTER;
692 timeouts[cnt].delay_ms = DeadlockTimeout;
693 cnt++;
694
695 enable_timeouts(timeouts, cnt);
696 }
697
698 /* Wait to be signaled by the release of the Relation Lock */
700
701 /*
702 * Exit if ltime is reached. Then all the backends holding conflicting
703 * locks will be canceled in the next ResolveRecoveryConflictWithLock()
704 * call.
705 */
707 goto cleanup;
708
710 {
711 VirtualTransactionId *backends;
712
713 backends = GetLockConflicts(&locktag, AccessExclusiveLock, NULL);
714
715 /* Quick exit if there's no work to be done */
716 if (!VirtualTransactionIdIsValid(*backends))
717 goto cleanup;
718
719 /*
720 * Send signals to all the backends holding the conflicting locks, to
721 * ask them to check themselves for deadlocks.
722 */
723 while (VirtualTransactionIdIsValid(*backends))
724 {
725 SignalVirtualTransaction(*backends,
727 false);
728 backends++;
729 }
730
731 /*
732 * Exit if the recovery conflict has not been logged yet even though
733 * logging is enabled, so that the caller can log that. Then
734 * RecoveryConflictWithLock() is called again and we will wait again
735 * for the lock to be released.
736 */
737 if (logging_conflict)
738 goto cleanup;
739
740 /*
741 * Wait again here to be signaled by the release of the Relation Lock,
742 * to prevent the subsequent RecoveryConflictWithLock() from causing
743 * deadlock_timeout and sending a request for deadlocks check again.
744 * Otherwise the request continues to be sent every deadlock_timeout
745 * until the relation locks are released or ltime is reached.
746 */
749 }
750
751cleanup:
752
753 /*
754 * Clear any timeout requests established above. We assume here that the
755 * Startup process doesn't have any other outstanding timeouts than those
756 * used by this function. If that stops being true, we could cancel the
757 * timeouts individually, but that'd be slower.
758 */
762}
static void pg_atomic_write_u64(volatile pg_atomic_uint64 *ptr, uint64 val)
Definition: atomics.h:485
static uint64 pg_atomic_read_u64(volatile pg_atomic_uint64 *ptr)
Definition: atomics.h:467
static void cleanup(void)
Definition: bootstrap.c:713
VirtualTransactionId * GetLockConflicts(const LOCKTAG *locktag, LOCKMODE lockmode, int *countp)
Definition: lock.c:2976
#define AccessExclusiveLock
Definition: lockdefs.h:43
pid_t SignalVirtualTransaction(VirtualTransactionId vxid, ProcSignalReason sigmode, bool conflictPending)
Definition: procarray.c:3497
static void ResolveRecoveryConflictWithVirtualXIDs(VirtualTransactionId *waitlist, ProcSignalReason reason, uint32 wait_event_info, bool report_waiting)
Definition: standby.c:359
static volatile sig_atomic_t got_standby_lock_timeout
Definition: standby.c:70
uint8 locktag_type
Definition: lock.h:170
pg_atomic_uint64 waitStart
Definition: proc.h:237
@ 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 467 of file standby.c.

470{
471 VirtualTransactionId *backends;
472
473 /*
474 * If we get passed InvalidTransactionId then we do nothing (no conflict).
475 *
476 * This can happen when replaying already-applied WAL records after a
477 * standby crash or restart, or when replaying an XLOG_HEAP2_VISIBLE
478 * record that marks as frozen a page which was already all-visible. It's
479 * also quite common with records generated during index deletion
480 * (original execution of the deletion can reason that a recovery conflict
481 * which is sufficient for the deletion operation must take place before
482 * replay of the deletion record itself).
483 */
484 if (!TransactionIdIsValid(snapshotConflictHorizon))
485 return;
486
487 Assert(TransactionIdIsNormal(snapshotConflictHorizon));
488 backends = GetConflictingVirtualXIDs(snapshotConflictHorizon,
489 locator.dbOid);
492 WAIT_EVENT_RECOVERY_CONFLICT_SNAPSHOT,
493 true);
494
495 /*
496 * Note that WaitExceedsMaxStandbyDelay() is not taken into account here
497 * (as opposed to ResolveRecoveryConflictWithVirtualXIDs() above). That
498 * seems OK, given that this kind of conflict should not normally be
499 * reached, e.g. due to using a physical replication slot.
500 */
501 if (wal_level >= WAL_LEVEL_LOGICAL && isCatalogRel)
503 snapshotConflictHorizon);
504}
VirtualTransactionId * GetConflictingVirtualXIDs(TransactionId limitXmin, Oid dbOid)
Definition: procarray.c:3417
bool InvalidateObsoleteReplicationSlots(ReplicationSlotInvalidationCause cause, XLogSegNo oldestSegno, Oid dboid, TransactionId snapshotConflictHorizon)
Definition: slot.c:1811
@ RS_INVAL_HORIZON
Definition: slot.h:56
#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_prune_freeze(), heap_xlog_visible(), ResolveRecoveryConflictWithSnapshotFullXid(), and spgRedoVacuumRedirect().

◆ ResolveRecoveryConflictWithSnapshotFullXid()

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

Definition at line 511 of file standby.c.

514{
515 /*
516 * ResolveRecoveryConflictWithSnapshot operates on 32-bit TransactionIds,
517 * so truncate the logged FullTransactionId. If the logged value is very
518 * old, so that XID wrap-around already happened on it, there can't be any
519 * snapshots that still see it.
520 */
522 uint64 diff;
523
524 diff = U64FromFullTransactionId(nextXid) -
525 U64FromFullTransactionId(snapshotConflictHorizon);
526 if (diff < MaxTransactionId / 2)
527 {
528 TransactionId truncated;
529
530 truncated = XidFromFullTransactionId(snapshotConflictHorizon);
532 isCatalogRel,
533 locator);
534 }
535}
uint64_t uint64
Definition: c.h:486
void ResolveRecoveryConflictWithSnapshot(TransactionId snapshotConflictHorizon, bool isCatalogRel, RelFileLocator locator)
Definition: standby.c:467
#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:288

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

Referenced by btree_xlog_reuse_page(), and gistRedoPageReuse().

◆ ResolveRecoveryConflictWithTablespace()

void ResolveRecoveryConflictWithTablespace ( Oid  tsid)

Definition at line 538 of file standby.c.

539{
540 VirtualTransactionId *temp_file_users;
541
542 /*
543 * Standby users may be currently using this tablespace for their
544 * temporary files. We only care about current users because
545 * temp_tablespace parameter will just ignore tablespaces that no longer
546 * exist.
547 *
548 * Ask everybody to cancel their queries immediately so we can ensure no
549 * temp files remain and we can remove the tablespace. Nuke the entire
550 * site from orbit, it's the only way to be sure.
551 *
552 * XXX: We could work out the pids of active backends using this
553 * tablespace by examining the temp filenames in the directory. We would
554 * then convert the pids into VirtualXIDs before attempting to cancel
555 * them.
556 *
557 * We don't wait for commit because drop tablespace is non-transactional.
558 */
560 InvalidOid);
563 WAIT_EVENT_RECOVERY_CONFLICT_TABLESPACE,
564 true);
565}
#define InvalidOid
Definition: postgres_ext.h:36
#define InvalidTransactionId
Definition: transam.h:31

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

Referenced by tblspc_redo().

◆ ResolveRecoveryConflictWithVirtualXIDs()

static void ResolveRecoveryConflictWithVirtualXIDs ( VirtualTransactionId waitlist,
ProcSignalReason  reason,
uint32  wait_event_info,
bool  report_waiting 
)
static

Definition at line 359 of file standby.c.

362{
363 TimestampTz waitStart = 0;
364 bool waiting = false;
365 bool logged_recovery_conflict = false;
366
367 /* Fast exit, to avoid a kernel call if there's no work to be done. */
368 if (!VirtualTransactionIdIsValid(*waitlist))
369 return;
370
371 /* Set the wait start timestamp for reporting */
372 if (report_waiting && (log_recovery_conflict_waits || update_process_title))
373 waitStart = GetCurrentTimestamp();
374
375 while (VirtualTransactionIdIsValid(*waitlist))
376 {
377 /* reset standbyWait_us for each xact we wait for */
379
380 /* wait until the virtual xid is gone */
381 while (!VirtualXactLock(*waitlist, false))
382 {
383 /* Is it time to kill it? */
384 if (WaitExceedsMaxStandbyDelay(wait_event_info))
385 {
386 pid_t pid;
387
388 /*
389 * Now find out who to throw out of the balloon.
390 */
392 pid = CancelVirtualTransaction(*waitlist, reason);
393
394 /*
395 * Wait a little bit for it to die so that we avoid flooding
396 * an unresponsive backend when system is heavily loaded.
397 */
398 if (pid != 0)
399 pg_usleep(5000L);
400 }
401
402 if (waitStart != 0 && (!logged_recovery_conflict || !waiting))
403 {
404 TimestampTz now = 0;
405 bool maybe_log_conflict;
406 bool maybe_update_title;
407
408 maybe_log_conflict = (log_recovery_conflict_waits && !logged_recovery_conflict);
409 maybe_update_title = (update_process_title && !waiting);
410
411 /* Get the current timestamp if not report yet */
412 if (maybe_log_conflict || maybe_update_title)
414
415 /*
416 * Report via ps if we have been waiting for more than 500
417 * msec (should that be configurable?)
418 */
419 if (maybe_update_title &&
420 TimestampDifferenceExceeds(waitStart, now, 500))
421 {
422 set_ps_display_suffix("waiting");
423 waiting = true;
424 }
425
426 /*
427 * Emit the log message if the startup process is waiting
428 * longer than deadlock_timeout for recovery conflict.
429 */
430 if (maybe_log_conflict &&
432 {
433 LogRecoveryConflict(reason, waitStart, now, waitlist, true);
434 logged_recovery_conflict = true;
435 }
436 }
437 }
438
439 /* The virtual transaction is gone now, wait for the next one */
440 waitlist++;
441 }
442
443 /*
444 * Emit the log message if recovery conflict was resolved but the startup
445 * process waited longer than deadlock_timeout for it.
446 */
447 if (logged_recovery_conflict)
448 LogRecoveryConflict(reason, waitStart, GetCurrentTimestamp(),
449 NULL, false);
450
451 /* reset ps display to remove the suffix if we added one */
452 if (waiting)
454
455}
bool TimestampDifferenceExceeds(TimestampTz start_time, TimestampTz stop_time, int msec)
Definition: timestamp.c:1780
static volatile sig_atomic_t waiting
Definition: latch.c:162
bool VirtualXactLock(VirtualTransactionId vxid, bool wait)
Definition: lock.c:4650
pid_t CancelVirtualTransaction(VirtualTransactionId vxid, ProcSignalReason sigmode)
Definition: procarray.c:3491
void set_ps_display_remove_suffix(void)
Definition: ps_status.c:423
void set_ps_display_suffix(const char *suffix)
Definition: ps_status.c:371
bool update_process_title
Definition: ps_status.c:31
static bool WaitExceedsMaxStandbyDelay(uint32 wait_event_info)
Definition: standby.c:233
static int standbyWait_us
Definition: standby.c:225
bool log_recovery_conflict_waits
Definition: standby.c:41
#define STANDBY_INITIAL_WAIT_US
Definition: standby.c:224
void LogRecoveryConflict(ProcSignalReason reason, TimestampTz wait_start, TimestampTz now, VirtualTransactionId *wait_list, bool still_waiting)
Definition: standby.c:273

References Assert, CancelVirtualTransaction(), DeadlockTimeout, GetCurrentTimestamp(), log_recovery_conflict_waits, LogRecoveryConflict(), now(), pg_usleep(), set_ps_display_remove_suffix(), set_ps_display_suffix(), STANDBY_INITIAL_WAIT_US, standbyWait_us, TimestampDifferenceExceeds(), update_process_title, VirtualTransactionIdIsValid, VirtualXactLock(), WaitExceedsMaxStandbyDelay(), and waiting.

Referenced by ResolveRecoveryConflictWithLock(), ResolveRecoveryConflictWithSnapshot(), and ResolveRecoveryConflictWithTablespace().

◆ SendRecoveryConflictWithBufferPin()

static void SendRecoveryConflictWithBufferPin ( ProcSignalReason  reason)
static

Definition at line 876 of file standby.c.

877{
880
881 /*
882 * We send signal to all backends to ask them if they are holding the
883 * buffer pin which is delaying the Startup process. We must not set the
884 * conflict flag yet, since most backends will be innocent. Let the
885 * SIGUSR1 handling in each backend decide their own fate.
886 */
887 CancelDBBackends(InvalidOid, reason, false);
888}

References Assert, CancelDBBackends(), InvalidOid, PROCSIG_RECOVERY_CONFLICT_BUFFERPIN, and PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK.

Referenced by ResolveRecoveryConflictWithBufferPin().

◆ ShutdownRecoveryTransactionEnvironment()

void ShutdownRecoveryTransactionEnvironment ( void  )

Definition at line 160 of file standby.c.

161{
162 /*
163 * Do nothing if RecoveryLockHash is NULL because that means that
164 * transaction tracking has not yet been initialized or has already been
165 * shut down. This makes it safe to have possibly-redundant calls of this
166 * function during process exit.
167 */
168 if (RecoveryLockHash == NULL)
169 return;
170
171 /* Mark all tracked in-progress transactions as finished. */
173
174 /* Release all locks the tracked transactions were holding */
176
177 /* Destroy the lock hash tables. */
180 RecoveryLockHash = NULL;
181 RecoveryLockXidHash = NULL;
182
183 /* Cleanup our VirtualTransaction */
185}
void hash_destroy(HTAB *hashp)
Definition: dynahash.c:865
void VirtualXactLockTableCleanup(void)
Definition: lock.c:4550
void ExpireAllKnownAssignedTransactionIds(void)
Definition: procarray.c:4498
void StandbyReleaseAllLocks(void)
Definition: standby.c:1105

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

Referenced by StartupProcExit(), and StartupXLOG().

◆ standby_redo()

void standby_redo ( XLogReaderState record)

Definition at line 1162 of file standby.c.

1163{
1164 uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
1165
1166 /* Backup blocks are not used in standby records */
1168
1169 /* Do nothing if we're not in hot standby mode */
1171 return;
1172
1173 if (info == XLOG_STANDBY_LOCK)
1174 {
1176 int i;
1177
1178 for (i = 0; i < xlrec->nlocks; i++)
1180 xlrec->locks[i].dbOid,
1181 xlrec->locks[i].relOid);
1182 }
1183 else if (info == XLOG_RUNNING_XACTS)
1184 {
1187
1188 running.xcnt = xlrec->xcnt;
1189 running.subxcnt = xlrec->subxcnt;
1191 running.nextXid = xlrec->nextXid;
1192 running.latestCompletedXid = xlrec->latestCompletedXid;
1193 running.oldestRunningXid = xlrec->oldestRunningXid;
1194 running.xids = xlrec->xids;
1195
1197
1198 /*
1199 * The startup process currently has no convenient way to schedule
1200 * stats to be reported. XLOG_RUNNING_XACTS records issued at a
1201 * regular cadence, making this a convenient location to report stats.
1202 * While these records aren't generated with wal_level=minimal, stats
1203 * also cannot be accessed during WAL replay.
1204 */
1205 pgstat_report_stat(true);
1206 }
1207 else if (info == XLOG_INVALIDATIONS)
1208 {
1210
1212 xlrec->nmsgs,
1213 xlrec->relcacheInitFileInval,
1214 xlrec->dbId,
1215 xlrec->tsId);
1216 }
1217 else
1218 elog(PANIC, "standby_redo: unknown op code %u", info);
1219}
uint8_t uint8
Definition: c.h:483
#define PANIC
Definition: elog.h:42
void ProcessCommittedInvalidationMessages(SharedInvalidationMessage *msgs, int nmsgs, bool RelcacheInitFileInval, Oid dbid, Oid tsid)
Definition: inval.c:1062
int i
Definition: isn.c:72
long pgstat_report_stat(bool force)
Definition: pgstat.c:692
void ProcArrayApplyRecoveryInfo(RunningTransactions running)
Definition: procarray.c:1054
void StandbyAcquireAccessExclusiveLock(TransactionId xid, Oid dbOid, Oid relOid)
Definition: standby.c:985
@ SUBXIDS_MISSING
Definition: standby.h:81
SharedInvalidationMessage msgs[FLEXIBLE_ARRAY_MEMBER]
Definition: standbydefs.h:69
TransactionId xids[FLEXIBLE_ARRAY_MEMBER]
Definition: standbydefs.h:56
xl_standby_lock locks[FLEXIBLE_ARRAY_MEMBER]
Definition: standbydefs.h:41
#define XLogRecGetInfo(decoder)
Definition: xlogreader.h:410
#define XLogRecGetData(decoder)
Definition: xlogreader.h:415
#define XLogRecHasAnyBlockRefs(decoder)
Definition: xlogreader.h:417
@ STANDBY_DISABLED
Definition: xlogutils.h:52

References Assert, xl_invalidations::dbId, xl_standby_lock::dbOid, elog, i, RunningTransactionsData::latestCompletedXid, xl_running_xacts::latestCompletedXid, xl_standby_locks::locks, xl_invalidations::msgs, RunningTransactionsData::nextXid, xl_running_xacts::nextXid, xl_standby_locks::nlocks, xl_invalidations::nmsgs, RunningTransactionsData::oldestRunningXid, xl_running_xacts::oldestRunningXid, PANIC, pgstat_report_stat(), ProcArrayApplyRecoveryInfo(), ProcessCommittedInvalidationMessages(), xl_invalidations::relcacheInitFileInval, xl_standby_lock::relOid, STANDBY_DISABLED, StandbyAcquireAccessExclusiveLock(), standbyState, RunningTransactionsData::subxcnt, xl_running_xacts::subxcnt, xl_running_xacts::subxid_overflow, RunningTransactionsData::subxid_status, SUBXIDS_IN_ARRAY, SUBXIDS_MISSING, xl_invalidations::tsId, RunningTransactionsData::xcnt, xl_running_xacts::xcnt, xl_standby_lock::xid, RunningTransactionsData::xids, xl_running_xacts::xids, XLOG_INVALIDATIONS, XLOG_RUNNING_XACTS, XLOG_STANDBY_LOCK, XLogRecGetData, XLogRecGetInfo, and XLogRecHasAnyBlockRefs.

◆ StandbyAcquireAccessExclusiveLock()

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

Definition at line 985 of file standby.c.

986{
987 RecoveryLockXidEntry *xidentry;
988 RecoveryLockEntry *lockentry;
990 LOCKTAG locktag;
991 bool found;
992
993 /* Already processed? */
994 if (!TransactionIdIsValid(xid) ||
997 return;
998
999 elog(DEBUG4, "adding recovery lock: db %u rel %u", dbOid, relOid);
1000
1001 /* dbOid is InvalidOid when we are locking a shared relation. */
1002 Assert(OidIsValid(relOid));
1003
1004 /* Create a hash entry for this xid, if we don't have one already. */
1005 xidentry = hash_search(RecoveryLockXidHash, &xid, HASH_ENTER, &found);
1006 if (!found)
1007 {
1008 Assert(xidentry->xid == xid); /* dynahash should have set this */
1009 xidentry->head = NULL;
1010 }
1011
1012 /* Create a hash entry for this lock, unless we have one already. */
1013 key.xid = xid;
1014 key.dbOid = dbOid;
1015 key.relOid = relOid;
1016 lockentry = hash_search(RecoveryLockHash, &key, HASH_ENTER, &found);
1017 if (!found)
1018 {
1019 /* It's new, so link it into the XID's list ... */
1020 lockentry->next = xidentry->head;
1021 xidentry->head = lockentry;
1022
1023 /* ... and acquire the lock locally. */
1024 SET_LOCKTAG_RELATION(locktag, dbOid, relOid);
1025
1026 (void) LockAcquire(&locktag, AccessExclusiveLock, true, false);
1027 }
1028}
#define OidIsValid(objectId)
Definition: c.h:729
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:955
#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:803
#define SET_LOCKTAG_RELATION(locktag, dboid, reloid)
Definition: lock.h:181
Definition: lock.h:165
struct RecoveryLockEntry * next
Definition: standby.c:55
TransactionId xid
Definition: standby.c:60
struct RecoveryLockEntry * head
Definition: standby.c:61
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, TransactionIdDidAbort(), TransactionIdDidCommit(), TransactionIdIsValid, and RecoveryLockXidEntry::xid.

Referenced by lock_twophase_standby_recover(), and standby_redo().

◆ StandbyDeadLockHandler()

void StandbyDeadLockHandler ( void  )

Definition at line 935 of file standby.c.

936{
938}

References got_standby_deadlock_timeout.

Referenced by StartupProcessMain().

◆ StandbyLockTimeoutHandler()

void StandbyLockTimeoutHandler ( void  )

Definition at line 953 of file standby.c.

954{
956}

References got_standby_lock_timeout.

Referenced by StartupProcessMain().

◆ StandbyReleaseAllLocks()

void StandbyReleaseAllLocks ( void  )

Definition at line 1105 of file standby.c.

1106{
1107 HASH_SEQ_STATUS status;
1108 RecoveryLockXidEntry *entry;
1109
1110 elog(DEBUG2, "release all standby locks");
1111
1113 while ((entry = hash_seq_search(&status)))
1114 {
1117 }
1118}
void * hash_seq_search(HASH_SEQ_STATUS *status)
Definition: dynahash.c:1420
void hash_seq_init(HASH_SEQ_STATUS *status, HTAB *hashp)
Definition: dynahash.c:1385
@ HASH_REMOVE
Definition: hsearch.h:115
static void StandbyReleaseXidEntryLocks(RecoveryLockXidEntry *xidentry)
Definition: standby.c:1034

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

Referenced by ShutdownRecoveryTransactionEnvironment(), and StandbyReleaseLocks().

◆ StandbyReleaseLocks()

static void StandbyReleaseLocks ( TransactionId  xid)
static

Definition at line 1067 of file standby.c.

1068{
1069 RecoveryLockXidEntry *entry;
1070
1071 if (TransactionIdIsValid(xid))
1072 {
1073 if ((entry = hash_search(RecoveryLockXidHash, &xid, HASH_FIND, NULL)))
1074 {
1077 }
1078 }
1079 else
1081}
@ HASH_FIND
Definition: hsearch.h:113

References HASH_FIND, HASH_REMOVE, hash_search(), RecoveryLockXidHash, StandbyReleaseAllLocks(), StandbyReleaseXidEntryLocks(), and TransactionIdIsValid.

Referenced by StandbyReleaseLockTree().

◆ StandbyReleaseLockTree()

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

Definition at line 1091 of file standby.c.

1092{
1093 int i;
1094
1096
1097 for (i = 0; i < nsubxids; i++)
1098 StandbyReleaseLocks(subxids[i]);
1099}
static void StandbyReleaseLocks(TransactionId xid)
Definition: standby.c:1067

References i, and StandbyReleaseLocks().

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

◆ StandbyReleaseOldLocks()

void StandbyReleaseOldLocks ( TransactionId  oldxid)

Definition at line 1129 of file standby.c.

1130{
1131 HASH_SEQ_STATUS status;
1132 RecoveryLockXidEntry *entry;
1133
1135 while ((entry = hash_seq_search(&status)))
1136 {
1138
1139 /* Skip if prepared transaction. */
1141 continue;
1142
1143 /* Skip if >= oldxid. */
1144 if (!TransactionIdPrecedes(entry->xid, oldxid))
1145 continue;
1146
1147 /* Remove all locks and hash table entry. */
1150 }
1151}
bool TransactionIdPrecedes(TransactionId id1, TransactionId id2)
Definition: transam.c:280
bool StandbyTransactionIdIsPrepared(TransactionId xid)
Definition: twophase.c:1463

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

Referenced by ProcArrayApplyRecoveryInfo().

◆ StandbyReleaseXidEntryLocks()

static void StandbyReleaseXidEntryLocks ( RecoveryLockXidEntry xidentry)
static

Definition at line 1034 of file standby.c.

1035{
1036 RecoveryLockEntry *entry;
1038
1039 for (entry = xidentry->head; entry != NULL; entry = next)
1040 {
1041 LOCKTAG locktag;
1042
1043 elog(DEBUG4,
1044 "releasing recovery lock: xid %u db %u rel %u",
1045 entry->key.xid, entry->key.dbOid, entry->key.relOid);
1046 /* Release the lock ... */
1047 SET_LOCKTAG_RELATION(locktag, entry->key.dbOid, entry->key.relOid);
1048 if (!LockRelease(&locktag, AccessExclusiveLock, true))
1049 {
1050 elog(LOG,
1051 "RecoveryLockHash contains entry for lock no longer recorded by lock manager: xid %u database %u relation %u",
1052 entry->key.xid, entry->key.dbOid, entry->key.relOid);
1053 Assert(false);
1054 }
1055 /* ... and remove the per-lock hash entry */
1056 next = entry->next;
1058 }
1059
1060 xidentry->head = NULL; /* just for paranoia */
1061}
static int32 next
Definition: blutils.c:219
bool LockRelease(const LOCKTAG *locktag, LOCKMODE lockmode, bool sessionLock)
Definition: lock.c:2011
xl_standby_lock key
Definition: standby.c:54

References AccessExclusiveLock, Assert, xl_standby_lock::dbOid, DEBUG4, elog, HASH_REMOVE, hash_search(), RecoveryLockXidEntry::head, RecoveryLockEntry::key, LockRelease(), LOG, next, RecoveryLockEntry::next, RecoveryLockHash, xl_standby_lock::relOid, SET_LOCKTAG_RELATION, and xl_standby_lock::xid.

Referenced by StandbyReleaseAllLocks(), StandbyReleaseLocks(), and StandbyReleaseOldLocks().

◆ StandbyTimeoutHandler()

void StandbyTimeoutHandler ( void  )

Definition at line 944 of file standby.c.

945{
947}

References got_standby_delay_timeout.

Referenced by StartupProcessMain().

◆ WaitExceedsMaxStandbyDelay()

static bool WaitExceedsMaxStandbyDelay ( uint32  wait_event_info)
static

Definition at line 233 of file standby.c.

234{
235 TimestampTz ltime;
236
238
239 /* Are we past the limit time? */
240 ltime = GetStandbyLimitTime();
241 if (ltime && GetCurrentTimestamp() >= ltime)
242 return true;
243
244 /*
245 * Sleep a bit (this is essential to avoid busy-waiting).
246 */
247 pgstat_report_wait_start(wait_event_info);
250
251 /*
252 * Progressively increase the sleep times, but not to more than 1s, since
253 * pg_usleep isn't interruptible on some platforms.
254 */
255 standbyWait_us *= 2;
256 if (standbyWait_us > 1000000)
257 standbyWait_us = 1000000;
258
259 return false;
260}
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:122
static void pgstat_report_wait_start(uint32 wait_event_info)
Definition: wait_event.h:85
static void pgstat_report_wait_end(void)
Definition: wait_event.h:101

References CHECK_FOR_INTERRUPTS, GetCurrentTimestamp(), GetStandbyLimitTime(), pg_usleep(), pgstat_report_wait_end(), pgstat_report_wait_start(), and standbyWait_us.

Referenced by ResolveRecoveryConflictWithVirtualXIDs().

Variable Documentation

◆ got_standby_deadlock_timeout

volatile sig_atomic_t got_standby_deadlock_timeout = false
static

◆ got_standby_delay_timeout

volatile sig_atomic_t got_standby_delay_timeout = false
static

Definition at line 69 of file standby.c.

Referenced by ResolveRecoveryConflictWithBufferPin(), and StandbyTimeoutHandler().

◆ got_standby_lock_timeout

volatile sig_atomic_t got_standby_lock_timeout = false
static

Definition at line 70 of file standby.c.

Referenced by ResolveRecoveryConflictWithLock(), and StandbyLockTimeoutHandler().

◆ log_recovery_conflict_waits

bool log_recovery_conflict_waits = false

◆ max_standby_archive_delay

int max_standby_archive_delay = 30 * 1000

Definition at line 39 of file standby.c.

Referenced by GetStandbyLimitTime().

◆ max_standby_streaming_delay

int max_standby_streaming_delay = 30 * 1000

Definition at line 40 of file standby.c.

Referenced by GetStandbyLimitTime().

◆ RecoveryLockHash

◆ RecoveryLockXidHash

◆ standbyWait_us

int standbyWait_us = STANDBY_INITIAL_WAIT_US
static