| From: | "Euler Taveira" <euler(at)eulerto(dot)com> |
|---|---|
| To: | "kuroda(dot)hayato(at)fujitsu(dot)com" <kuroda(dot)hayato(at)fujitsu(dot)com>, "Shlok Kyal" <shlok(dot)kyal(dot)oss(at)gmail(dot)com> |
| Cc: | "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, "vignesh C" <vignesh21(at)gmail(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>, Fabrízio de Royes Mello <fabriziomello(at)gmail(dot)com> |
| Subject: | Re: speed up a logical replica setup |
| Date: | 2024-02-22 21:01:23 |
| Message-ID: | d898faad-f6d7-4b0d-b816-b9dcdf490685@app.fastmail.com |
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| Lists: | pgsql-hackers |
On Thu, Feb 22, 2024, at 9:43 AM, Hayato Kuroda (Fujitsu) wrote:
> > The possible solution would be
> > 1) allow to run pg_createsubscriber if standby is initially stopped .
> > I observed that pg_logical_createsubscriber also uses this approach.
> > 2) read GUCs via SHOW command and restore them when server restarts
> >
3. add a config-file option. That's similar to what pg_rewind does. I expect
that Debian-based installations will have this issue.
> I also prefer the first solution.
> Another reason why the standby should be stopped is for backup purpose.
> Basically, the standby instance should be saved before running pg_createsubscriber.
> An easiest way is hard-copy, and the postmaster should be stopped at that time.
> I felt it is better that users can run the command immediately later the copying.
> Thought?
It was not a good idea if you want to keep the postgresql.conf outside PGDATA.
I mean you need extra steps that can be error prone (different settings between
files).
Shlok, I didn't read your previous email carefully. :-/
--
Euler Taveira
EDB https://www.enterprisedb.com/
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