Re: Skipping logical replication transactions on subscriber side

From: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
To: Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>
Cc: "houzj(dot)fnst(at)fujitsu(dot)com" <houzj(dot)fnst(at)fujitsu(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Greg Nancarrow <gregn4422(at)gmail(dot)com>, "tanghy(dot)fnst(at)fujitsu(dot)com" <tanghy(dot)fnst(at)fujitsu(dot)com>, "osumi(dot)takamichi(at)fujitsu(dot)com" <osumi(dot)takamichi(at)fujitsu(dot)com>, Alexey Lesovsky <lesovsky(at)gmail(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Skipping logical replication transactions on subscriber side
Date: 2021-11-29 03:43:34
Message-ID: CAA4eK1JfJBJZyTEmG-z=Uu32aMTx8d+aLLorzDXt6s=ERa_ykA@mail.gmail.com
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On Mon, Nov 29, 2021 at 7:12 AM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
>
> On Sat, Nov 27, 2021 at 7:56 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> >
>
> Thank you for updating the patch!
>
> > I have made a number of changes in the attached patch which includes
> > (a) the patch was trying to register multiple array entries for the
> > same subscription which doesn't seem to be required, see changes in
> > pgstat_vacuum_stat, (b) multiple changes in the test like reduced the
> > wal_retrieve_retry_interval to 2s which has reduced the test time to
> > half, remove the check related to resetting of stats as there is no
> > guarantee that the message will be received by the collector and we
> > were not sending it again, changed the test case file name to
> > 026_stats as we can add more subscription-related stats in this test
> > file itself
>
> Since we have pg_stat_subscription view, how about 026_worker_stats.pl?
>

Sounds better. Updated patch attached.

> The rests look good to me.
>

Okay, I'll push this patch tomorrow unless there are more comments.

--
With Regards,
Amit Kapila.

Attachment Content-Type Size
v28-0001-Add-a-view-to-show-the-stats-of-subscription-wor.patch application/octet-stream 54.5 KB

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