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Commit0eac283

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author
Amit Kapila
committed
Change overly strict Assert in TransactionGroupUpdateXidStatus.
This Assert thought that an overflowed transaction can never get registeredfor the group update.  But that is not true, because even when the numberof children for a transaction got reduced, the overflow flag is notchanged. And, for group update, we only care about the current number ofchildren for a transaction that is being committed.Based on comments by Andres Freund, remove a redundant Assert inTransactionIdSetPageStatus as we already had a static Assert for the samecondition a few lines earlier.Reported-by: Vignesh CAuthor: Dilip KumarReviewed-by: Amit KapilaBackpatch-through: 11Discussion:https://postgr.es/m/CAFiTN-s5=uJw-Z6JC9gcqtBSjXsrHnU63PXBrA=pnBjqnkm5UA@mail.gmail.com
1 parent95f43fe commit0eac283

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lines changed
  • src/backend/access/transam

1 file changed

+3
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‎src/backend/access/transam/clog.c

Lines changed: 3 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -299,13 +299,6 @@ TransactionIdSetPageStatus(TransactionId xid, int nsubxids,
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memcmp(subxids,MyProc->subxids.xids,
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nsubxids*sizeof(TransactionId))==0)
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{
302-
/*
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* We don't try to do group update optimization if a process has
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* overflowed the subxids array in its PGPROC, since in that case we
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* don't have a complete list of XIDs for it.
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*/
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Assert(THRESHOLD_SUBTRANS_CLOG_OPT <=PGPROC_MAX_CACHED_SUBXIDS);
308-
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/*
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* If we can immediately acquire CLogControlLock, we update the status
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* of our own XID and release the lock. If not, try use group XID
@@ -520,10 +513,10 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
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PGXACT*pgxact=&ProcGlobal->allPgXact[nextidx];
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/*
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*Overflowed transactions should not use group XID status update
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* mechanism.
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*Transactions with more than THRESHOLD_SUBTRANS_CLOG_OPT sub-XIDs
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*should not use group XID status updatemechanism.
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*/
526-
Assert(!pgxact->overflowed);
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Assert(pgxact->nxids <=THRESHOLD_SUBTRANS_CLOG_OPT);
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TransactionIdSetPageStatusInternal(proc->clogGroupMemberXid,
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pgxact->nxids,

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