Re: Parallel tests publication and subscription might fail due to concurrent tuple update

From: Jelte Fennema-Nio <postgres(at)jeltef(dot)nl>
To: Alexander Lakhin <exclusion(at)gmail(dot)com>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Parallel tests publication and subscription might fail due to concurrent tuple update
Date: 2024-12-15 11:01:07
Message-ID: CAGECzQTTfKH0yRqv_2kpkLzBwhSk-2=d8+8XkeVDoFFDqRve-Q@mail.gmail.com
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On Sun, 15 Dec 2024 at 10:00, Alexander Lakhin <exclusion(at)gmail(dot)com> wrote:
> shows that the subscription and publication tests are not concurrent-safe,
> because modifying the same pg_database entry might fail with the "tuple
> concurrently updated" error.

This seems related to this thread about concurrency issues in
ALTER/DROP SUBSCRIPTION[1], except that this is for GRANT/REVOKE it
seems.

The easiest way to address the flakiness of this test though is
probably to just don't run these tests in in parallel. See attached.

[1]: https://www.postgresql.org/message-id/flat/HE1PR8303MB0075BF78AF1BE904050DA16BF7729%40HE1PR8303MB0075.EURPRD83.prod.outlook.com

Attachment Content-Type Size
v1-0001-Don-t-run-flaky-tests-in-parallel-with-eachother.patch application/octet-stream 1022 bytes

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