| From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
|---|---|
| To: | "Zhijie Hou (Fujitsu)" <houzj(dot)fnst(at)fujitsu(dot)com> |
| Cc: | Bertrand Drouvot <bertranddrouvot(dot)pg(at)gmail(dot)com>, shveta malik <shveta(dot)malik(at)gmail(dot)com>, Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com>, Ajin Cherian <itsajin(at)gmail(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Nisha Moond <nisha(dot)moond412(at)gmail(dot)com>, "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Subject: | Re: Synchronizing slots from primary to standby |
| Date: | 2024-04-08 10:31:41 |
| Message-ID: | CAA4eK1Jgkr0_ad4Ct4dTc3LzZJZHEXzrKQh8uaKw2Cfk8spd1g@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Apr 8, 2024 at 12:19 PM Zhijie Hou (Fujitsu)
<houzj(dot)fnst(at)fujitsu(dot)com> wrote:
>
> On Saturday, April 6, 2024 12:43 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> > On Fri, Apr 5, 2024 at 8:05 PM Bertrand Drouvot
> > <bertranddrouvot(dot)pg(at)gmail(dot)com> wrote:
> >
> > Yeah, that could be the first step. We can probably add an injection point to
> > control the bgwrite behavior and then add tests involving walsender
> > performing the decoding. But I think it is important to have sufficient tests in
> > this area as I see they are quite helpful in uncovering the issues.
>
> Here is the patch to drop the subscription in the beginning so that the
> restart_lsn of the lsub1_slot won't be advanced due to concurrent
> xl_running_xacts from bgwriter. The subscription will be re-created after all
> the slots are sync-ready. I think maybe we can use this to stabilize the test
> as a first step and then think about how to make use of injection point to add
> more tests if it's worth it.
>
Pushed.
--
With Regards,
Amit Kapila.
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