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From: alvherre@alvh.no-ip.org <alvherre@alvh.no-ip.org>
To: Bossart, Nathan <bossartn@amazon.com>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Cc: x4mmm@yandex-team.ru <x4mmm@yandex-team.ru>
Cc: a.lubennikova@postgrespro.ru <a.lubennikova@postgrespro.ru>
Cc: hlinnaka@iki.fi <hlinnaka@iki.fi>
Cc: matsumura.ryo@fujitsu.com <matsumura.ryo@fujitsu.com>
Cc: masao.fujii@gmail.com <masao.fujii@gmail.com>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Subject: Re: archive status ".ready" files may be created too early
Date: Mon, 23 Aug 2021 12:31:48 -0400
Message-ID: <202108231631.wpeh7fk2j7oz@alvherre.pgsql> (raw)
In-Reply-To: <A619E76E-FA05-43D3-B888-13101E4E5305@amazon.com>

On 2021-Aug-23, Bossart, Nathan wrote:

> Hm.  My expectation would be that if there are no registrations, we
> cannot create .ready files for the flushed segments.  The scenario
> where I can see that happening is when a record gets flushed to disk
> prior to registration.  In that case, we'll still eventually register
> the record and wake up the WAL writer process, which will take care of
> creating the .ready files that were missed earlier.  Is there another
> case you are thinking of where we could miss registration for a cross-
> segment record altogether?

I'm thinking of the case where no record cross segment boundaries ever.

-- 
Álvaro Herrera         PostgreSQL Developer  —  https://www.EnterpriseDB.com/





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