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When updating ShmemVariableCache from a checkpoint record, be sure to set

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all the values derived from oldestXid, not just that field.  Brain fade in
one of my patches associated with flat file removal, exposed by a report
from Fujii Masao.

With this change, xidVacLimit should always be valid, so remove a couple of
bits of complexity associated with the previous assumption that sometimes
it wouldn't get set right away.
This commit is contained in:
Tom Lane 2010-02-17 03:10:33 +00:00
parent 711804fddd
commit c64339face
2 changed files with 13 additions and 21 deletions
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17
src/backend/access/transam/varsup.c
View File

@ -6,7 +6,7 @@
* Copyright (c) 2000-2010, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/varsup.c,v 1.88 2010/02/14 18:42:12 rhaas Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/varsup.c,v 1.89 2010/02/17 03:10:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -71,13 +71,9 @@ GetNewTransactionId(bool isSubXact)
* If we're past xidStopLimit, refuse to execute transactions, unless
* we are running in a standalone backend (which gives an escape hatch
* to the DBA who somehow got past the earlier defenses).
*
* Test is coded to fall out as fast as possible during normal operation,
* ie, when the vac limit is set and we haven't violated it.
*----------
*/
if (TransactionIdFollowsOrEquals(xid, ShmemVariableCache->xidVacLimit) &&
TransactionIdIsValid(ShmemVariableCache->xidVacLimit))
if (TransactionIdFollowsOrEquals(xid, ShmemVariableCache->xidVacLimit))
{
/*
* For safety's sake, we release XidGenLock while sending signals,
@ -340,11 +336,11 @@ SetTransactionIdLimit(TransactionId oldest_datfrozenxid, Oid oldest_datoid)
* another iteration immediately if there are still any old databases.
*/
if (TransactionIdFollowsOrEquals(curXid, xidVacLimit) &&
IsUnderPostmaster)
IsUnderPostmaster && !InRecovery)
SendPostmasterSignal(PMSIGNAL_START_AUTOVAC_LAUNCHER);
/* Give an immediate warning if past the wrap warn point */
if (TransactionIdFollowsOrEquals(curXid, xidWarnLimit))
if (TransactionIdFollowsOrEquals(curXid, xidWarnLimit) && !InRecovery)
{
char *oldest_datname = get_database_name(oldest_datoid);
@ -399,8 +395,9 @@ ForceTransactionIdLimitUpdate(void)
if (!TransactionIdIsNormal(oldestXid))
return true; /* shouldn't happen, but just in case */
if (TransactionIdFollowsOrEquals(nextXid, xidVacLimit) &&
TransactionIdIsValid(xidVacLimit))
if (!TransactionIdIsValid(xidVacLimit))
return true; /* this shouldn't happen anymore either */
if (TransactionIdFollowsOrEquals(nextXid, xidVacLimit))
return true; /* past VacLimit, don't delay updating */
if (!SearchSysCacheExists1(DATABASEOID, ObjectIdGetDatum(oldestXidDB)))
return true; /* could happen, per comments above */

17
src/backend/access/transam/xlog.c
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.373 2010/02/12 09:49:08 heikki Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.374 2010/02/17 03:10:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -4761,8 +4761,7 @@ BootStrapXLOG(void)
ShmemVariableCache->nextOid = checkPoint.nextOid;
ShmemVariableCache->oidCount = 0;
MultiXactSetNextMXact(checkPoint.nextMulti, checkPoint.nextMultiOffset);
ShmemVariableCache->oldestXid = checkPoint.oldestXid;
ShmemVariableCache->oldestXidDB = checkPoint.oldestXidDB;
SetTransactionIdLimit(checkPoint.oldestXid, checkPoint.oldestXidDB);
/* Set up the XLOG page header */
page->xlp_magic = XLOG_PAGE_MAGIC;
@ -5597,8 +5596,7 @@ StartupXLOG(void)
ShmemVariableCache->nextOid = checkPoint.nextOid;
ShmemVariableCache->oidCount = 0;
MultiXactSetNextMXact(checkPoint.nextMulti, checkPoint.nextMultiOffset);
ShmemVariableCache->oldestXid = checkPoint.oldestXid;
ShmemVariableCache->oldestXidDB = checkPoint.oldestXidDB;
SetTransactionIdLimit(checkPoint.oldestXid, checkPoint.oldestXidDB);
/*
* We must replay WAL entries using the same TimeLineID they were created
@ -7447,8 +7445,7 @@ xlog_redo(XLogRecPtr lsn, XLogRecord *record)
ShmemVariableCache->oidCount = 0;
MultiXactSetNextMXact(checkPoint.nextMulti,
checkPoint.nextMultiOffset);
ShmemVariableCache->oldestXid = checkPoint.oldestXid;
ShmemVariableCache->oldestXidDB = checkPoint.oldestXidDB;
SetTransactionIdLimit(checkPoint.oldestXid, checkPoint.oldestXidDB);
/* Check to see if any changes to max_connections give problems */
if (standbyState != STANDBY_DISABLED)
@ -7502,10 +7499,8 @@ xlog_redo(XLogRecPtr lsn, XLogRecord *record)
checkPoint.nextMultiOffset);
if (TransactionIdPrecedes(ShmemVariableCache->oldestXid,
checkPoint.oldestXid))
{
ShmemVariableCache->oldestXid = checkPoint.oldestXid;
ShmemVariableCache->oldestXidDB = checkPoint.oldestXidDB;
}
SetTransactionIdLimit(checkPoint.oldestXid,
checkPoint.oldestXidDB);
/* ControlFile->checkPointCopy always tracks the latest ckpt XID */
ControlFile->checkPointCopy.nextXidEpoch = checkPoint.nextXidEpoch;