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| author | Noah Misch <noah@leadboat.com> | 2020-03-21 09:38:26 -0700 |
|---|---|---|
| committer | Noah Misch <noah@leadboat.com> | 2020-03-21 09:38:30 -0700 |
| commit | 88b3a6cd262344f5de64eab31804a0f39a7c6337 (patch) | |
| tree | ce7bbd85fc067a8ac04fab7e7323e1b1e6bebf1f /src/backend/commands/cluster.c | |
| parent | b35017549ce1253de0580ec618cdc9020f4b5e05 (diff) | |
| download | postgresql-88b3a6cd262344f5de64eab31804a0f39a7c6337.tar.gz postgresql-88b3a6cd262344f5de64eab31804a0f39a7c6337.zip | |
During heap rebuild, lock any TOAST index until end of transaction.
swap_relation_files() calls toast_get_valid_index() to find and lock
this index, just before swapping with the rebuilt TOAST index. The
latter function releases the lock before returning. Potential for
mischief is low; a concurrent session can issue ALTER INDEX ... SET
(fillfactor = ...), which is not alarming. Nonetheless, changing
pg_class.relfilenode without a lock is unconventional. Back-patch to
9.5 (all supported versions), because another fix needs this.
Discussion: https://postgr.es/m/20191226001521.GA1772687@rfd.leadboat.com
Diffstat (limited to 'src/backend/commands/cluster.c')
| -rw-r--r-- | src/backend/commands/cluster.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c index ebaec4f8dd9..c7fda21634d 100644 --- a/src/backend/commands/cluster.c +++ b/src/backend/commands/cluster.c @@ -1490,7 +1490,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, /* Get the associated valid index to be renamed */ toastidx = toast_get_valid_index(newrel->rd_rel->reltoastrelid, - AccessShareLock); + NoLock); /* rename the toast table ... */ snprintf(NewToastName, NAMEDATALEN, "pg_toast_%u", |