Re: pg_get_wal_replay_pause_state() should not return 'paused' while a promotion is ongoing.

From: Michael Paquier <michael(at)paquier(dot)xyz>
To: Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com>
Cc: Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: pg_get_wal_replay_pause_state() should not return 'paused' while a promotion is ongoing.
Date: 2021-05-18 06:46:07
Message-ID: YKNirzqM1HYyk5h4@paquier.xyz
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On Tue, May 18, 2021 at 12:48:38PM +0900, Fujii Masao wrote:
> Currently a promotion causes all available WAL to be replayed before
> a standby becomes a primary whether it was in paused state or not.
> OTOH, something like immediate promotion (i.e., standby becomes
> a primary without replaying outstanding WAL) might be useful for
> some cases. I don't object to that.

Sounds like a "promotion immediate" mode. It does not sound difficult
nor expensive to add a small test for that in one of the existing
recovery tests triggerring a promotion. Could you add one based on
pg_get_wal_replay_pause_state()?
--
Michael

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