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

On Fri, 21 Jul 2017 04:58:47 -0700
Andres Freund <andres(at)anarazel(dot)de> wrote:

> Hi,
>
> (please don't top-reply on this list)
>
> 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
> suggested:

Not yet, but I'll try to do it.

>
> > > > 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

--
Yugo Nagata <nagata(at)sraoss(dot)co(dot)jp>