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In-Reply-To: 
 <CAJDiXgh0py4DcbJOW5VaCeHtyofFSAaR2Mx3BhyJHppG15Lr3g@mail.gmail.com>
From: Masahiko Sawada <sawada.mshk@gmail.com>
Date: Thu, 2 Apr 2026 16:00:11 -0700
Message-ID: 
 <CAD21AoA_eRa9nVCenw3tnVwUCgR-Jk4=W4GuV36+oYKgBmRwNA@mail.gmail.com>
Subject: Re: POC: Parallel processing of indexes in autovacuum
To: Daniil Davydov <3danissimo@gmail.com>
Cc: Alexander Korotkov <aekorotkov@gmail.com>,
	SATYANARAYANA NARLAPURAM <satyanarlapuram@gmail.com>,
	Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>,
 Sami Imseih <samimseih@gmail.com>,
	Matheus Alcantara <matheusssilv97@gmail.com>,
 Maxim Orlov <orlovmg@gmail.com>,
	Postgres hackers <pgsql-hackers@lists.postgresql.org>
Content-Type: text/plain; charset="UTF-8"
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Archived-At: 
 <https://www.postgresql.org/message-id/CAD21AoA_eRa9nVCenw3tnVwUCgR-Jk4%3DW4GuV36%2BoYKgBmRwNA%40mail.gmail.com>
Precedence: bulk

On Thu, Apr 2, 2026 at 8:10=E2=80=AFAM Daniil Davydov <3danissimo@gmail.com=
> wrote:
>
> Hi,
>
> On Thu, Apr 2, 2026 at 6:16=E2=80=AFAM Masahiko Sawada <sawada.mshk@gmail=
.com> wrote:
> >
> > Thank you for updating the patch! I found a bug in the following code:
> >
> > @@ -457,6 +534,9 @@ parallel_vacuum_end(ParallelVacuumState *pvs,
> > IndexBulkDeleteResult **istats)
> >   DestroyParallelContext(pvs->pcxt);
> >   ExitParallelMode();
> >
> > + if (AmAutoVacuumWorkerProcess())
> > + pv_shared_cost_params =3D NULL;
> > +
> >
> > If an autovacuum worker raises an error during parallel vacuum, it
> > doesn't pv_shared_cost_params. Then, if it doesn't use parallel vacuum
> > on the next table to vacuum, it would end up with SEGV as it attempts
> > to propagate the vacuum delay parameters.
>
> Ouch. Indeed, I did not foresee this.
> Thank you for noticing it!
>
> I think we should add some cleanup for autovacuum near the ParallelContex=
t
> cleanup, since they are interconnected. I also want to return our tests t=
hat
> are triggering ERROR/PANIC in the leader worker in order to check whether=
 all
> resources are released. I hope I will be able to get to that by tomorrow
> evening.

I think that the beginning of vacuum loop (in PG_TRY() block in
vacuum()) seems better place as we're resetting vacuum delay
parameters:

        in_vacuum =3D true;
        VacuumFailsafeActive =3D false;
        VacuumUpdateCosts();
        VacuumCostBalance =3D 0;
        VacuumCostBalanceLocal =3D 0;
        VacuumSharedCostBalance =3D NULL;
        VacuumActiveNWorkers =3D NULL;

Regards,

--=20
Masahiko Sawada
Amazon Web Services: https://aws.amazon.com