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| author | Michael Paquier <michael@paquier.xyz> | 2022-10-26 09:41:26 +0900 |
|---|---|---|
| committer | Michael Paquier <michael@paquier.xyz> | 2022-10-26 09:41:26 +0900 |
| commit | 51c24d9e21d7c36cbb6890655fd8f57270cdb15a (patch) | |
| tree | bb5fe174dcb8a834ba3a98ec6af284d1d61fae43 /src | |
| parent | 475e9daf39799b7ae160753761318193480d5942 (diff) | |
| download | postgresql-51c24d9e21d7c36cbb6890655fd8f57270cdb15a.tar.gz postgresql-51c24d9e21d7c36cbb6890655fd8f57270cdb15a.zip | |
Fix ordering issue with WAL operations in GIN fast insert path
Contrary to what is documented in src/backend/access/transam/README,
ginHeapTupleFastInsert() had a few ordering issues with the way it does
its WAL operations when inserting items in its fast path.
First, when using a separate list, XLogBeginInsert() was being always
called before START_CRIT_SECTION(), and in this case a second thing was
wrong when merging lists, as an exclusive lock was taken on the tail
page *before* calling XLogBeginInsert(). Finally, when inserting items
into a tail page, the order of XLogBeginInsert() and
START_CRIT_SECTION() was reversed. This commit addresses all these
issues by moving the calls of XLogBeginInsert() after all the pages
logged are locked and pinned, within a critical section.
This has been applied first only on HEAD as of 56b6625, but as per
discussion with Tom Lane and Álvaro Herrera, a backpatch is preferred to
keep all the branches consistent and to respect the transam's README
where we can.
Author: Matthias van de Meent, Zhang Mingli
Discussion: https://postgr.es/m/CAEze2WhL8uLMqynnnCu1LAPwxD5RKEo0nHV+eXGg_N6ELU88HQ@mail.gmail.com
Backpatch-through: 10
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/access/gin/ginfast.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/src/backend/access/gin/ginfast.c b/src/backend/access/gin/ginfast.c index 2b3dd1c677f..a7a49b36fd0 100644 --- a/src/backend/access/gin/ginfast.c +++ b/src/backend/access/gin/ginfast.c @@ -284,9 +284,6 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector) memset(&sublist, 0, sizeof(GinMetaPageData)); makeSublist(index, collector->tuples, collector->ntuples, &sublist); - if (needWal) - XLogBeginInsert(); - /* * metapage was unlocked, see above */ @@ -306,6 +303,9 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector) metadata->nPendingPages = sublist.nPendingPages; metadata->nPendingHeapTuples = sublist.nPendingHeapTuples; + + if (needWal) + XLogBeginInsert(); } else { @@ -334,7 +334,10 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector) metadata->nPendingHeapTuples += sublist.nPendingHeapTuples; if (needWal) + { + XLogBeginInsert(); XLogRegisterBuffer(1, buffer, REGBUF_STANDARD); + } } } else @@ -360,11 +363,11 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector) data.ntuples = collector->ntuples; + START_CRIT_SECTION(); + if (needWal) XLogBeginInsert(); - START_CRIT_SECTION(); - /* * Increase counter of heap tuples */ |