From: Julien Rouhaud <rjuju123@gmail.com>
To: Victor Sudakov <vas@sibptus.ru>
Cc: Nikhil Shetty <nikhil.dba04@gmail.com>
Cc: Pgsql-admin <pgsql-admin@lists.postgresql.org>
Cc: pgsql-admin <pgsql-admin@postgresql.org>
Subject: Re: Lost replication slots after pg_upgrade.
Date: Tue, 8 Feb 2022 16:45:20 +0800
Message-ID: <20220208084520.hvp3qnwxtfmzq2lr@jrouhaud> (raw)
In-Reply-To: <YgIqlvDg1S9xNNYn@admin.sibptus.ru>
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<YgIqlvDg1S9xNNYn@admin.sibptus.ru>
On Tue, Feb 08, 2022 at 08:32:22AM +0000, Victor Sudakov wrote:
> Julien Rouhaud wrote:
> >
> > > pg_basebackup takes time for large databases (> 5TB). I feel rsync should
> > > be faster.
> >
> > Not necessarily. pg_basebackup will do simple sequential read of all the data,
> > which is probably the fastest thing to do. rsync will do some extra processing
> > that isn't required in that scenario, so it's likely to be slower (although
> > probably only marginally slower).
>
> I think Nikhil was going to invoke the rsync black magic as described
> in https://www.postgresql.org/docs/current/pgupgrade.html, not for
> copying the entire PGDATA from the master to standbys. While the rsync
> magic should be hundreds of times faster because only modified files
> will be copied and the majority of files will be just hardlinked, I've
> never felt I have enough skill and luck to undertake this method.
Ah, if that's the case I don't think there's any doubt to have for rsync being
faster. And this method works just fine if you take care of what you're doing.
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To: pgsql-admin@postgresql.org
Cc: rjuju123@gmail.com, vas@sibptus.ru, nikhil.dba04@gmail.com, pgsql-admin@lists.postgresql.org
Subject: Re: Lost replication slots after pg_upgrade.
In-Reply-To: <20220208084520.hvp3qnwxtfmzq2lr@jrouhaud>
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