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Commit3725570

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Fix bug in early startup of Hot Standby with subtransactions.
When HS startup is deferred because of overflowed subtransactions, ensurethat we re-initialize KnownAssignedXids for when both existing and incomingsnapshots have non-zero qualifying xids.Fixes bug #6661 reported by Valentine Gogichashvili.Analysis and fix by Andres Freund
1 parent3b5548a commit3725570

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1 file changed

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‎src/backend/storage/ipc/procarray.c

Lines changed: 31 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -160,6 +160,7 @@ static int KnownAssignedXidsGetAndSetXmin(TransactionId *xarray,
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TransactionIdxmax);
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staticTransactionIdKnownAssignedXidsGetOldestXmin(void);
162162
staticvoidKnownAssignedXidsDisplay(inttrace_level);
163+
staticvoidKnownAssignedXidsReset(void);
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164165
/*
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* Report shared-memory space needed by CreateSharedProcArray.
@@ -526,6 +527,11 @@ ProcArrayApplyRecoveryInfo(RunningTransactions running)
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*/
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if (!running->subxid_overflow||running->xcnt==0)
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{
530+
/*
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* If we have already collected known assigned xids, we need to
532+
* throw them away before we apply the recovery snapshot.
533+
*/
534+
KnownAssignedXidsReset();
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standbyState=STANDBY_INITIALIZED;
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}
531537
else
@@ -569,7 +575,6 @@ ProcArrayApplyRecoveryInfo(RunningTransactions running)
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* xids to subtrans. If RunningXacts is overflowed then we don't have
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* enough information to correctly update subtrans anyway.
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*/
572-
Assert(procArray->numKnownAssignedXids==0);
573578

574579
/*
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* Allocate a temporary array to avoid modifying the array passed as
@@ -599,6 +604,12 @@ ProcArrayApplyRecoveryInfo(RunningTransactions running)
599604

600605
if (nxids>0)
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{
607+
if (procArray->numKnownAssignedXids!=0)
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{
609+
LWLockRelease(ProcArrayLock);
610+
elog(ERROR,"KnownAssignedXids is not empty");
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}
612+
602613
/*
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* Sort the array so that we can add them safely into
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* KnownAssignedXids.
@@ -3340,3 +3351,22 @@ KnownAssignedXidsDisplay(int trace_level)
33403351

33413352
pfree(buf.data);
33423353
}
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/*
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* KnownAssignedXidsReset
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*Resets KnownAssignedXids to be empty
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*/
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staticvoid
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KnownAssignedXidsReset(void)
3361+
{
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/* use volatile pointer to prevent code rearrangement */
3363+
volatileProcArrayStruct*pArray=procArray;
3364+
3365+
LWLockAcquire(ProcArrayLock,LW_EXCLUSIVE);
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3367+
pArray->numKnownAssignedXids=0;
3368+
pArray->tailKnownAssignedXids=0;
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pArray->headKnownAssignedXids=0;
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LWLockRelease(ProcArrayLock);
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}

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