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Don't allow relminmxid to go backwards during VACUUM FULL

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We were allowing a table's pg_class.relminmxid value to move backwards
when heaps were swapped by VACUUM FULL or CLUSTER.  There is a
similar protection against relfrozenxid going backwards, which we
neglected to clone when the multixact stuff was rejiggered by commit
0ac5ad5134f276.

Backpatch to 9.3, where relminmxid was introduced.

As reported by Heikki in
http://www.postgresql.org/message-id/52401AEA.9000608@vmware.com
This commit is contained in:
Alvaro Herrera 2014-06-27 14:43:45 -04:00
parent 5c538442a0
commit e86cfc4bbe
1 changed files with 6 additions and 0 deletions
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6
src/backend/commands/cluster.c
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@ -873,6 +873,12 @@ copy_heap_data(Oid OIDNewHeap, Oid OIDOldHeap, Oid OIDOldIndex,
if (TransactionIdPrecedes(FreezeXid, OldHeap->rd_rel->relfrozenxid))
FreezeXid = OldHeap->rd_rel->relfrozenxid;
/*
* MultiXactCutoff, similarly, shouldn't go backwards either.
*/
if (MultiXactIdPrecedes(MultiXactCutoff, OldHeap->rd_rel->relminmxid))
MultiXactCutoff = OldHeap->rd_rel->relminmxid;
/* return selected values to caller */
*pFreezeXid = FreezeXid;
*pCutoffMulti = MultiXactCutoff;