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 <CAPpHfds0Y7pcOrhwuFSJXvs58-=tv=_odWMCoCch01P2QaXq1w@mail.gmail.com>
 <202503101112.ozklxnrfw4dr@alvherre.pgsql>
In-Reply-To: <202503101112.ozklxnrfw4dr@alvherre.pgsql>
From: Alexander Korotkov <aekorotkov@gmail.com>
Date: Tue, 11 Mar 2025 23:33:25 +0200
Message-ID: 
 <CAPpHfdsE4O15X=rbNt9f1KAyg2k6XcmHfUOrcWURKQ-yHPggAg@mail.gmail.com>
Subject: Re: pgsql: reindexdb: Add the index-level REINDEX with multiple jobs
To: =?UTF-8?Q?=C3=81lvaro_Herrera?= <alvherre@alvh.no-ip.org>
Cc: Alexander Korotkov <akorotkov@postgresql.org>,
 pgsql-hackers@lists.postgresql.org,
	Maxim Orlov <orlovmg@gmail.com>,
 Svetlana Derevyanko <s.derevyanko@postgrespro.ru>
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On Mon, Mar 10, 2025 at 1:12=E2=80=AFPM =C3=81lvaro Herrera <alvherre@alvh.=
no-ip.org> wrote:
> On 2025-Mar-09, Alexander Korotkov wrote:
>
> > After second thought it's not so hard to fix.  The attached patch does
> > it by putting REINDEX commands related to the same table into a single
> > SQL statement.  Possibly, that could be better than revert given we
> > need to handle compatibility.  What do you think?
>
> Oh, this is an egg of Columbus solution, I like it.  It seems to work as
> intended on a quick test.  Please add some commentary to run_reindex_comm=
and.
>
> Maybe another, possibly better way to do this would be to use libpq
> pipeline mode, sending all the commands for a table in one pipeline
> instead of a single command.  The advantage of this would be that
> server-side log entries for each command would be separate, and they
> wouldn't appear clumped together in pg_stat_activity and so on.
> However, this would require more invasive changes, so it might be better
> to leave that for a future project -- it's certainly a harder sell for
> such a change to be backpatched.  So I'm +1 on your current patch for 17
> and master.

Thank you for your feedback!  I also think that pipelining would be a
better options, but it's too invasive for backpatching. I've written
comments for gen_reindex_command() and run_reindex_command().  I'm
going to push this patch to master and 17 if no objections.

------
Regards,
Alexander Korotkov
Supabase

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