Re: [HACKERS] Moving relation extension locks out of heavyweight lock manager

From: Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>
To: Dmitry Dolgov <9erthalion6(at)gmail(dot)com>
Cc: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, Andres Freund <andres(at)anarazel(dot)de>, Konstantin Knizhnik <k(dot)knizhnik(at)postgrespro(dot)ru>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: [HACKERS] Moving relation extension locks out of heavyweight lock manager
Date: 2018-11-30 01:02:51
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On Fri, Nov 30, 2018 at 1:17 AM Dmitry Dolgov <9erthalion6(at)gmail(dot)com> wrote:
> > On Mon, Oct 1, 2018 at 8:54 AM Michael Paquier <michael(at)paquier(dot)xyz> wrote:
> >
> > On Wed, Jun 06, 2018 at 07:03:47PM +0530, Amit Kapila wrote:
> > > I think Robert's chash stuff [1] might be helpful to reduce the contention
> > > you are seeing.
> >
> > Latest patch available does not apply, so I moved it to next CF. The
> > thread has died a bit as well...
> Unfortunately, patch is still needs to be rebased. Could you do this, are there
> any plans about the patch?

I have a plan but it's a future plan. This patch is for parallel
vacuum patch. As I mentioned at that thread[1], I'm focusing on only
parallel index vacuum, which would not require the relation extension
lock improvements for now. Therefore, I want to withdraw this patch
and to reactivate when we need this enhancement.

So I think we can mark it as 'Returned with feedback'.



Masahiko Sawada
NTT Open Source Software Center

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