Re: speed up a logical replica setup

From: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
To: "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Alexander Lakhin <exclusion(at)gmail(dot)com>, Peter Eisentraut <peter(at)eisentraut(dot)org>, Euler Taveira <euler(at)eulerto(dot)com>, Shlok Kyal <shlok(dot)kyal(dot)oss(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Michael Paquier <michael(at)paquier(dot)xyz>, Andres Freund <andres(at)anarazel(dot)de>, Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>, Fabrízio de Royes Mello <fabriziomello(at)gmail(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>
Subject: Re: speed up a logical replica setup
Date: 2024-07-03 06:15:53
Message-ID: CAA4eK1+CH+xvLoDrMNgXk5AVziy2QO5DanPry+8Pzh_U+AQ4HA@mail.gmail.com
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On Wed, Jul 3, 2024 at 11:27 AM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
>
> > Do you have any other idea?
> >
>
> The other idea could be that we use the minimum restart_lsn of all the
> slots created by this tool as a consistent_lsn. We can probably get
> that value by using pg_get_replication_slots() but this idea needs
> further evaluation as to whether it will lead to a consistent
> subscriber.
>

This may not work because when the confirmed_flush LSN of any slot is
ahead of the consistent_lsn value we derived above, we could miss
receiving some transactions. So, I don't have any better ideas than
what I mentioned yesterday.

--
With Regards,
Amit Kapila.

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