From 3a4837fc809a8656374959049f3ac7a09a711334 Mon Sep 17 00:00:00 2001 From: Andres Freund Date: Mon, 25 Mar 2024 19:58:10 -0700 Subject: [PATCH] Avoid edge case in pg_visibility test with small shared_buffers Since 82a4edabd27 we can bulk extend relations. The bulk relation extension logic has a heuristic component. Normally the heurstic does not trigger in the occasionally-failing test case, as the relation is only extended once. But with very small shared_buffers the limits for the number of buffers pinned at once prevent the extension from happening at once. With the second "bulk" extension, the heuristic kicks in, and the relation ends up one block bigger. That's ok from a correctness perspective, but changes the results of the test query due to one additional block. We discussed a few more expansive fixes, but for now have decided to avoid this by making the table a bit smaller. Author: Heikki Linnakangas Reported-by: Discussion: https://postgr.es/m/29c74104-210b-ef39-2522-27a6aa7a704f@iki.fi Discussion: https://postgr.es/m/20230916000011.2ugpkkkp7bpp4cfh@awork3.anarazel.de Backpatch: 16-, where the new relation extension logic was added --- contrib/pg_visibility/expected/pg_visibility.out | 3 +-- contrib/pg_visibility/sql/pg_visibility.sql | 6 ------ 2 files changed, 1 insertion(+), 8 deletions(-) diff --git a/contrib/pg_visibility/expected/pg_visibility.out b/contrib/pg_visibility/expected/pg_visibility.out index 9de54db2a2..09fa5933a3 100644 --- a/contrib/pg_visibility/expected/pg_visibility.out +++ b/contrib/pg_visibility/expected/pg_visibility.out @@ -217,8 +217,7 @@ select * from pg_visibility_map('copyfreeze'); -------+-------------+------------ 0 | t | t 1 | t | t - 2 | t | t -(3 rows) +(2 rows) select * from pg_check_frozen('copyfreeze'); t_ctid diff --git a/contrib/pg_visibility/sql/pg_visibility.sql b/contrib/pg_visibility/sql/pg_visibility.sql index ff3538f996..5af06ec5b7 100644 --- a/contrib/pg_visibility/sql/pg_visibility.sql +++ b/contrib/pg_visibility/sql/pg_visibility.sql @@ -108,12 +108,6 @@ copy copyfreeze from stdin freeze; 4 '4' 5 '5' 6 '6' -7 '7' -8 '8' -9 '9' -10 '10' -11 '11' -12 '12' \. commit; select * from pg_visibility_map('copyfreeze');