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Correct epoch of txid_current() when executed on a Hot Standby server. 

Initialise ckptXidEpoch from starting checkpoint and maintain the correct
value as we roll forwards. This allows GetNextXidAndEpoch() to return the
correct epoch when executed during recovery. Backpatch to 9.0 when the
problem is first observable by a user.

Bug report from Daniel Farina
This commit is contained in:
Simon Riggs 2012-03-29 14:57:08 +01:00
parent 4d278b785e
commit 20d98ab6e4
1 changed files with 26 additions and 4 deletions
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30
src/backend/access/transam/xlog.c
View File

@ -6331,6 +6331,10 @@ StartupXLOG(void)
/* No need to hold ControlFileLock yet, we aren't up far enough */
UpdateControlFile();
/* initialize shared-memory copy of latest checkpoint XID/epoch */
XLogCtl->ckptXidEpoch = ControlFile->checkPointCopy.nextXidEpoch;
XLogCtl->ckptXid = ControlFile->checkPointCopy.nextXid;
/* initialize our local copy of minRecoveryPoint */
minRecoveryPoint = ControlFile->minRecoveryPoint;
@ -6875,10 +6879,6 @@ StartupXLOG(void)
/* start the archive_timeout timer running */
XLogCtl->Write.lastSegSwitchTime = (pg_time_t) time(NULL);
/* initialize shared-memory copy of latest checkpoint XID/epoch */
XLogCtl->ckptXidEpoch = ControlFile->checkPointCopy.nextXidEpoch;
XLogCtl->ckptXid = ControlFile->checkPointCopy.nextXid;
/* also initialize latestCompletedXid, to nextXid - 1 */
ShmemVariableCache->latestCompletedXid = ShmemVariableCache->nextXid;
TransactionIdRetreat(ShmemVariableCache->latestCompletedXid);
@ -8461,6 +8461,17 @@ xlog_redo(XLogRecPtr lsn, XLogRecord *record)
ControlFile->checkPointCopy.nextXidEpoch = checkPoint.nextXidEpoch;
ControlFile->checkPointCopy.nextXid = checkPoint.nextXid;
/* Update shared-memory copy of checkpoint XID/epoch */
{
/* use volatile pointer to prevent code rearrangement */
volatile XLogCtlData *xlogctl = XLogCtl;
SpinLockAcquire(&xlogctl->info_lck);
xlogctl->ckptXidEpoch = checkPoint.nextXidEpoch;
xlogctl->ckptXid = checkPoint.nextXid;
SpinLockRelease(&xlogctl->info_lck);
}
/*
* TLI may change in a shutdown checkpoint, but it shouldn't decrease
*/
@ -8501,6 +8512,17 @@ xlog_redo(XLogRecPtr lsn, XLogRecord *record)
ControlFile->checkPointCopy.nextXidEpoch = checkPoint.nextXidEpoch;
ControlFile->checkPointCopy.nextXid = checkPoint.nextXid;
/* Update shared-memory copy of checkpoint XID/epoch */
{
/* use volatile pointer to prevent code rearrangement */
volatile XLogCtlData *xlogctl = XLogCtl;
SpinLockAcquire(&xlogctl->info_lck);
xlogctl->ckptXidEpoch = checkPoint.nextXidEpoch;
xlogctl->ckptXid = checkPoint.nextXid;
SpinLockRelease(&xlogctl->info_lck);
}
/* TLI should not change in an on-line checkpoint */
if (checkPoint.ThisTimeLineID != ThisTimeLineID)
ereport(PANIC,