From: Álvaro Herrera <alvherre@kurilemu.de>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: BRIN autosummarization may need a snapshot
Date: Tue, 04 Nov 2025 12:24:42 +0000
Message-ID: <E1vGG5a-004zIl-0Y@gemulon.postgresql.org> (raw)
BRIN autosummarization may need a snapshot
It's possible to define BRIN indexes on functions that require a
snapshot to run, but the autosummarization feature introduced by commit
7526e10224f0 fails to provide one. This causes autovacuum to leave a
BRIN placeholder tuple behind after a failed work-item execution, making
such indexes less efficient. Repair by obtaining a snapshot prior to
running the task, and add a test to verify this behavior.
Author: Álvaro Herrera <alvherre@kurilemu.de>
Reported-by: Giovanni Fabris <giovanni.fabris@icon.it>
Reported-by: Arthur Nascimento <tureba@gmail.com>
Backpatch-through: 13
Discussion: https://postgr.es/m/202511031106.h4fwyuyui6fz@alvherre.pgsql
Branch
------
REL_18_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/419ffde235469bd7459bd52b7eeed76a7520853a
Modified Files
--------------
src/backend/postmaster/autovacuum.c | 2 ++
src/test/modules/brin/t/01_workitems.pl | 37 ++++++++++++++++++++++++++++++---
2 files changed, 36 insertions(+), 3 deletions(-)
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To: pgsql-committers@postgresql.org
Cc: alvherre@kurilemu.de, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: BRIN autosummarization may need a snapshot
In-Reply-To: <E1vGG5a-004zIl-0Y@gemulon.postgresql.org>
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