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Fix catalog lookup due to wrong snapshot for subtransactions during decoding.

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In commit 272248a0c, we fixed the catalog lookup due to the wrong snapshot
for transactions and subtransactions during decoding. We failed to
consider the case where top-level xact is already marked as containing
catalog change but its subtransaction is not yet marked as containing
catalog change even though it contained such a change.

This can happen when during decoding, none of the WAL records from the
subtransaction was decoded and top-level xact contains a DDL.

We fix it by marking the transaction and all its subtransactions as
containing catalog changes if the top-level xact contains any catalog
change and it is present in the initial running xacts array.

This fix is required only for 14 and 15 because in prior branches we
already always mark the transaction and all its subtransactions as
containing catalog changes in the same case. In 16 and above, we preserve
the list of transaction IDs and sub-transaction IDs, that have modified
catalogs and are running during snapshot serialization, to the serialized
snapshot (see commit 7f13ac8123).

Author: Fei Changhong
Reviewed-by: Amit Kapila, Hayato Kuroda, Andy Fan
Discussion: https://postgr.es/m/18280-4c8060178cb41750@postgresql.org
This commit is contained in:
Amit Kapila
2024-01-29 10:42:41 +05:30
parent 8b34cff338
commit b793a416bf
3 changed files with 65 additions and 4 deletions
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10
src/backend/replication/logical/snapbuild.c
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@@ -2126,11 +2126,13 @@ SnapBuildXidSetCatalogChanges(SnapBuild *builder, TransactionId xid, int subxcnt
TransactionId *subxacts, XLogRecPtr lsn)
{
/*
* Skip if there is no initial running xacts information or the
* transaction is already marked as containing catalog changes.
* Skip if there is no initial running xacts information.
*
* Even if the transaction has been marked as containing catalog
* changes, it cannot be skipped because its subtransactions that
* modified the catalog may not be marked.
*/
if (NInitialRunningXacts == 0 ||
ReorderBufferXidHasCatalogChanges(builder->reorder, xid))
if (NInitialRunningXacts == 0)
return;
if (bsearch(&xid, InitialRunningXacts, NInitialRunningXacts,