Re: [PATCH] Make sure all statistics is sent after a few DML are performed

From: Andres Freund <andres(at)anarazel(dot)de>
To: Yugo Nagata <nagata(at)sraoss(dot)co(dot)jp>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: [PATCH] Make sure all statistics is sent after a few DML are performed
Date: 2017-07-21 11:58:47
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On 2017-07-19 14:04:39 +0900, Yugo Nagata wrote:
> On Tue, 18 Jul 2017 10:10:49 -0400
> Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Thank you for your comments. I understand the problem of my proposal
> patch.

Does that mean you're trying to rewrite it in the way that was

> > > Another,
> > > pretty half-baked, approach would be to add a procsignal triggering idle
> > > backends to send stats, and send that to all idle backends when querying
> > > stats. We could even publish the number of outstanding stats updates in
> > > PGXACT or such, without any locking, and send it only to those that have
> > > outstanding ones.
> >
> > If somebody wanted to do the work, that'd be a viable answer IMO. You'd
> > really want to not wake backends that have nothing more to send, but
> > I agree that it'd be possible to advertise that in shared memory.

or are you planning to just let the issue leave be?

- Andres

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