Re: Report bytes and transactions actually sent downtream

From: Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>
To: Bertrand Drouvot <bertranddrouvot(dot)pg(at)gmail(dot)com>
Cc: shveta malik <shveta(dot)malik(at)gmail(dot)com>, Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Report bytes and transactions actually sent downtream
Date: 2025-10-24 09:53:44
Message-ID: CAExHW5sddgg0G9qPKZNZAkj6byRSRSJ-PYH65nEh2Of4YGy7EQ@mail.gmail.com
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On Mon, Oct 6, 2025 at 10:32 AM Ashutosh Bapat
<ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> wrote:
>
> On Fri, Oct 3, 2025 at 7:17 PM Bertrand Drouvot
> <bertranddrouvot(dot)pg(at)gmail(dot)com> wrote:
> >
> > Hi,
> >
> > On Fri, Oct 03, 2025 at 12:22:05PM +0530, Ashutosh Bapat wrote:
> > > Here's patchset addressing two issues:
> >
> > Thanks for the patch update!
> >
> > > I
> > > have added a note in documentation for plugin authors, warning them
> > > that this isn't expected.
> >
> > What note are you referring to? (I'm failing to see it).
>
> Patch 0002, changes in logicaldecoding.sgml. I am a bit hesitant to
> add more details as to what "misleading" means since mentioning so
> might be seen as a documented behaviour and thus plugin authors
> relying on it.
>
> >
> > > I don't think it's worth adding complexity
> > > in code to support such a case unless we see a practical need for the
> > > same.
> >
> > Sounds good.
> >
> >
> > > Issue 2: Once X + 2 is loaded, further statistics are accumulated on
> > > the top of statistics accumulated by version X. Attached patch fixes
> > > issue 2 by zero'ing out the stats when the plugin does not report the
> > > statistics.
> >
> > +#define REPLSLOT_SET_TO_ZERO(fld) statent->fld = 0
> >
> > It looks like that the associated "undef" is missing.
>
> Good catch. Fixed.
>

Squashed patches into one and rebased.

--
Best Wishes,
Ashutosh Bapat

Attachment Content-Type Size
0001-Report-output-plugin-statistics-in-pg_stat_-20251024.patch text/x-patch 52.8 KB

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