Re: speed up a logical replica setup

From: vignesh C <vignesh21(at)gmail(dot)com>
To: Euler Taveira <euler(at)eulerto(dot)com>
Cc: "kuroda(dot)hayato(at)fujitsu(dot)com" <kuroda(dot)hayato(at)fujitsu(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Peter Eisentraut <peter(at)eisentraut(dot)org>, Andres Freund <andres(at)anarazel(dot)de>, Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Shlok Kyal <shlok(dot)kyal(dot)oss(at)gmail(dot)com>, Fabrízio de Royes Mello <fabriziomello(at)gmail(dot)com>
Subject: Re: speed up a logical replica setup
Date: 2024-03-16 17:08:30
Message-ID: CALDaNm07ZzAdfo2bVWH0XWNepq6PKw7JXUHU08Aqata3k2U1ag@mail.gmail.com
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On Sat, 16 Mar 2024 at 21:16, Euler Taveira <euler(at)eulerto(dot)com> wrote:
>
> On Sat, Mar 16, 2024, at 10:31 AM, vignesh C wrote:
>
> I was able to reproduce this random failure and found the following reason:
> The Minimum recovery ending location 0/5000000 was more than the
> recovery_target_lsn specified is "0/4001198". In few random cases the
> standby applies a few more WAL records after the replication slot is
> created; this leads to minimum recovery ending location being greater
> than the recovery_target_lsn because of which the server will fail
> with:
> FATAL: requested recovery stop point is before consistent recovery point
>
>
> Thanks for checking. I proposed an alternative patch for it [1]. Can you check
> it?

This approach looks good to me.

Regards,
Vignesh

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