| From: | "Euler Taveira" <euler(at)eulerto(dot)com> |
|---|---|
| To: | "Shlok Kyal" <shlok(dot)kyal(dot)oss(at)gmail(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>, "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: | 2024-02-20 01:28:17 |
| Message-ID: | 79088f3e-7b9d-4059-9b36-e5ee0bc3889b@app.fastmail.com |
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| Lists: | pgsql-hackers |
On Mon, Feb 19, 2024, at 7:22 AM, Shlok Kyal wrote:
> I have reviewed the v21 patch. And found an issue.
>
> Initially I started the standby server with a new postgresql.conf file
> (not the default postgresql.conf that is present in the instance).
> pg_ctl -D ../standby start -o "-c config_file=/new_path/postgresql.conf"
>
> And I have made 'max_replication_slots = 1' in new postgresql.conf and
> made 'max_replication_slots = 0' in the default postgresql.conf file.
> Now when we run pg_createsubscriber on standby we get error:
> pg_createsubscriber: error: could not set replication progress for the
> subscription "pg_createsubscriber_5_242843": ERROR: cannot query or
> manipulate replication origin when max_replication_slots = 0
That's by design. See [1]. The max_replication_slots parameter is used as the
maximum number of subscriptions on the server.
> NOTICE: dropped replication slot "pg_createsubscriber_5_242843" on publisher
> pg_createsubscriber: error: could not drop publication
> "pg_createsubscriber_5" on database "postgres": ERROR: publication
> "pg_createsubscriber_5" does not exist
> pg_createsubscriber: error: could not drop replication slot
> "pg_createsubscriber_5_242843" on database "postgres": ERROR:
> replication slot "pg_createsubscriber_5_242843" does not exist
That's a bug and should be fixed.
--
Euler Taveira
EDB https://www.enterprisedb.com/
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