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Fix rd_firstRelfilenodeSubid for nailed relations, in parallel workers.

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Move applicable code out of RelationBuildDesc(), which nailed relations
bypass.  Non-assert builds experienced no known problems.  Back-patch to
v13, where commit c6b92041d3 introduced
rd_firstRelfilenodeSubid.

Kyotaro Horiguchi.  Reported by Justin Pryzby.

Discussion: https://postgr.es/m/20200907023737.GA7158@telsasoft.com
This commit is contained in:
Noah Misch
2020-09-09 18:50:24 -07:00
parent bedadc7322
commit fe4d022c8e
3 changed files with 36 additions and 8 deletions
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23
src/backend/utils/cache/relcache.c vendored
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@ -1243,14 +1243,6 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
if (insertIt)
RelationCacheInsert(relation, true);
/*
* For RelationNeedsWAL() to answer correctly on parallel workers, restore
* rd_firstRelfilenodeSubid. No subtransactions start or end while in
* parallel mode, so the specific SubTransactionId does not matter.
*/
if (IsParallelWorker() && RelFileNodeSkippingWAL(relation->rd_node))
relation->rd_firstRelfilenodeSubid = TopSubTransactionId;
/* It's fully valid */
relation->rd_isvalid = true;
@ -1273,6 +1265,8 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
static void
RelationInitPhysicalAddr(Relation relation)
{
Oid oldnode = relation->rd_node.relNode;
/* these relations kinds never have storage */
if (!RELKIND_HAS_STORAGE(relation->rd_rel->relkind))
return;
@ -1330,6 +1324,19 @@ RelationInitPhysicalAddr(Relation relation)
elog(ERROR, "could not find relation mapping for relation \"%s\", OID %u",
RelationGetRelationName(relation), relation->rd_id);
}
/*
* For RelationNeedsWAL() to answer correctly on parallel workers, restore
* rd_firstRelfilenodeSubid. No subtransactions start or end while in
* parallel mode, so the specific SubTransactionId does not matter.
*/
if (IsParallelWorker() && oldnode != relation->rd_node.relNode)
{
if (RelFileNodeSkippingWAL(relation->rd_node))
relation->rd_firstRelfilenodeSubid = TopSubTransactionId;
else
relation->rd_firstRelfilenodeSubid = InvalidSubTransactionId;
}
}
/*