From: | Magnus Hagander <magnus(at)hagander(dot)net> |
---|---|
To: | Julien Rouhaud <rjuju123(at)gmail(dot)com> |
Cc: | Michael Paquier <michael(at)paquier(dot)xyz>, Andres Freund <andres(at)anarazel(dot)de>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Stephen Frost <sfrost(at)snowman(dot)net>, Bruce Momjian <bruce(at)momjian(dot)us>, Christoph Berg <myon(at)debian(dot)org>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
Subject: | Re: compute_query_id and pg_stat_statements |
Date: | 2021-05-11 07:43:25 |
Message-ID: | CABUevEyMRUXsiPG1iGxWm3tcn-at72r6YsWn8kvzM29L9Qs+5Q@mail.gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
On Tue, May 11, 2021 at 9:35 AM Julien Rouhaud <rjuju123(at)gmail(dot)com> wrote:
>
> On Tue, May 11, 2021 at 03:04:13PM +0900, Michael Paquier wrote:
> > On Tue, Apr 27, 2021 at 02:25:04PM +0800, Julien Rouhaud wrote:
> > > On Mon, Apr 26, 2021 at 11:37:45AM -0700, Andres Freund wrote:
> > >> On 2021-04-26 14:21:00 -0400, Tom Lane wrote:
> > >>> That's sounding like a pretty sane design, actually. Not sure about
> > >>> the shared-library-name-with-fixed-function-name detail, but certainly
> > >>> it seems to be useful to separate "I need a query-id" from the details
> > >>> of the ID calculation.
> > >>>
> > >>> Rather than a GUC per se for the ID provider, maybe we could have a
> > >>> function hook that defaults to pointing at the in-core computation,
> > >>> and then a module wanting to override that just gets into the hook.
> > >>
> > >> I have a preference to determining the provider via GUC instead of a
> > >> hook because it is both easier to introspect and easier to configure.
> >
> > So, this thread has died two weeks ago, and it is still an open item.
> > Could it be possible to move to a resolution by beta1? The consensus
> > I can get from the thread is that we should have a tri-value state to
> > track an extra "auto" for the query ID computation, as proposed by
> > Alvaro here:
> > https://www.postgresql.org/message-id/20210426174331.GA19401@alvherre.pgsql
> >
> > Unfortunately, nothing has happened to be able to do something like
> > that.
>
> My understanding was that there wasn't a consensus on how to fix the problem.
>
> Anyway, PFA a patch that implement a [off | on | auto] compute_query_id, and
> provides a new queryIdWanted() function to let third party plugins inform us
> that they want a query id if possible.
30 second review -- wouldn't it be cleaner to keep a separate boolean
telling the backend "include it or not", which is set to true/false in
the guc assign hook and can then be flipped from false->true in
queryIdWanted()? (I'd suggest a more verbose name for that function
btw, something like requestQueryIdGeneration() or so).
(Again, just the 30 second review between meetings, so maybe I'm completely off)
--
Magnus Hagander
Me: https://www.hagander.net/
Work: https://www.redpill-linpro.com/
From | Date | Subject | |
---|---|---|---|
Next Message | Fujii Masao | 2021-05-11 07:44:49 | Re: wal stats questions |
Previous Message | Michael Paquier | 2021-05-11 07:42:27 | Re: Teaching users how they can get the most out of HOT in Postgres 14 |