Re: IPC/MultixactCreation on the Standby server

From: Andrey Borodin <x4mmm(at)yandex-team(dot)ru>
To: Maxim Orlov <orlovmg(at)gmail(dot)com>
Cc: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Álvaro Herrera <alvherre(at)kurilemu(dot)de>, pgsql-hackers(at)lists(dot)postgresql(dot)org, Ivan Bykov <i(dot)bykov(at)modernsys(dot)ru>, Kirill Reshke <reshkekirill(at)gmail(dot)com>
Subject: Re: IPC/MultixactCreation on the Standby server
Date: 2025-12-05 18:36:42
Message-ID: 703E24ED-2E31-41E5-93FD-A48F3D8B70F2@yandex-team.ru
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> On 5 Dec 2025, at 21:36, Maxim Orlov <orlovmg(at)gmail(dot)com> wrote:
>
> It's good that the test was added. But it seems like it could be
> improved a bit. The problem is, it only runs successfully with a
> standard block size. Plus, the comment about the number of bytes was a
> bit unclear, for my taste. PFA patch, it should make this test pass
> with different block sizes.

Oh, great catch!

Other tests seem to extract block size using database query like

$primary->safe_psql('postgres',
"SELECT setting::int FROM pg_settings WHERE name = 'block_size';");
or
$blksize = int($node->safe_psql('postgres', 'SHOW block_size;'));

But here we do not have running cluster, so resorting to parsing pg_resetwal seems reasonable.

Thanks!

Best regards, Andrey Borodin.

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