| From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
|---|---|
| To: | Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com> |
| Cc: | Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Mahendra Singh <mahi6run(at)gmail(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Robert Haas <robertmhaas(at)gmail(dot)com>, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, David Steele <david(at)pgmasters(dot)net>, Claudio Freire <klaussfreire(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] Block level parallel vacuum |
| Date: | 2019-11-13 08:57:13 |
| Message-ID: | CAA4eK1+7gmQDNsYhZx1Fw0O+=_y23427oF+w5+FyzGU-5Q8kxg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Nov 13, 2019 at 11:39 AM Masahiko Sawada
<masahiko(dot)sawada(at)2ndquadrant(dot)com> wrote:
>
> On Wed, 13 Nov 2019 at 12:43, Dilip Kumar <dilipbalaut(at)gmail(dot)com> wrote:
> >
> >
> > In this function, if ParallelVacuumIsActive, we perform the parallel
> > vacuum for all the index for which parallel vacuum is supported and
> > once that is over we finish vacuuming remaining indexes for which
> > parallel vacuum is not supported. But, my question is that inside
> > lazy_parallel_vacuum_or_cleanup_indexes, we wait for all the workers
> > to finish their job then only we start with the sequential vacuuming
> > shouldn't we start that immediately as soon as the leader
> > participation is over in the parallel vacuum?
>
> If we do that, while the leader process is vacuuming indexes that
> don't not support parallel vacuum sequentially some workers might be
> vacuuming for other indexes. Isn't it a problem?
>
Can you please explain what problem do you see with that?
--
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com
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