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From: Alexander Korotkov <aekorotkov@gmail.com>
Date: Sun, 9 Mar 2025 04:53:29 +0200
Message-ID: 
 <CAPpHfds_hJh1vYMAsATDNNDFXygyosD0n7M=HXwCiJTphvWCCg@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 Sat, Mar 8, 2025 at 12:49=E2=80=AFPM Alexander Korotkov <aekorotkov@gmai=
l.com> wrote:
> On Fri, Mar 7, 2025 at 8:20=E2=80=AFPM =C3=81lvaro Herrera <alvherre@alvh=
.no-ip.org> wrote:
> >
> > On 2024-Mar-25, Alexander Korotkov wrote:
> >
> > > reindexdb: Add the index-level REINDEX with multiple jobs
> > >
> > > Straight-forward index-level REINDEX is not supported with multiple j=
obs as
> > > we cannot control the concurrent processing of multiple indexes depen=
ding on
> > > the same relation.  Instead, we dedicate the whole table to certain r=
eindex
> > > job.  Thus, if indexes in the lists belong to different tables, that =
gives us
> > > a fair level of parallelism.
> >
> > I tested this, because of a refactoring suggestion [1] and I find that
> > it's rather completely broken.
>
> The code was written with assumption that running
> run_reindex_command() with async =3D=3D true can schedule a number of
> queries for a connection.  But actually that's not true and everything
> is broken.

The draft patch for revert is attached.  Could you, please, check.

------
Regards,
Alexander Korotkov
Supabase

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