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Fix order of arguments to SubTransSetParent().

Browse source 
ProcessTwoPhaseBuffer (formerly StandbyRecoverPreparedTransactions)
mixed up the parent and child XIDs when calling SubTransSetParent to
record the transactions' relationship in pg_subtrans.

Remarkably, analysis by Simon Riggs suggests that this doesn't lead to
visible problems (at least, not in non-Assert builds).  That might
explain why we'd not noticed it before.  Nonetheless, it's surely wrong.

This code was born broken, so back-patch to all supported branches.

Discussion: https://postgr.es/m/20110.1492905318@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2017-04-23 13:10:57 -04:00
parent 33f3bbc6d3
commit 0874d4f3e1
1 changed files with 1 additions and 1 deletions
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2
src/backend/access/transam/twophase.c
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@ -2142,7 +2142,7 @@ ProcessTwoPhaseBuffer(TransactionId xid,
}
if (setParent)
SubTransSetParent(xid, subxid, overwriteOK);
SubTransSetParent(subxid, xid, overwriteOK);
}
return buf;