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From: vignesh C <vignesh21@gmail.com>
Date: Thu, 19 Jan 2023 18:53:37 +0530
Message-ID: <CALDaNm3O3qWff3sRoN5Znf802CqPL6OCPSTSQr2ZGLUQ0vDV9g@mail.gmail.com>
Subject: Re: Time delayed LR (WAS Re: logical replication restrictions)
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: "Takamichi Osumi (Fujitsu)" <osumi.takamichi@fujitsu.com>, Peter Smith <smithpb2250@gmail.com>, 
	Kyotaro Horiguchi <horikyota.ntt@gmail.com>, 
	"Hayato Kuroda (Fujitsu)" <kuroda.hayato@fujitsu.com>, 
	"shveta.malik@gmail.com" <shveta.malik@gmail.com>, "dilipbalaut@gmail.com" <dilipbalaut@gmail.com>, 
	"euler@eulerto.com" <euler@eulerto.com>, "m.melihmutlu@gmail.com" <m.melihmutlu@gmail.com>, 
	"andres@anarazel.de" <andres@anarazel.de>, "marcos@f10.com.br" <marcos@f10.com.br>, 
	"pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
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Precedence: bulk

On Thu, 19 Jan 2023 at 18:29, Amit Kapila <amit.kapila16@gmail.com> wrote:
>
> On Thu, Jan 19, 2023 at 4:25 PM vignesh C <vignesh21@gmail.com> wrote:
> >
> > On Thu, 19 Jan 2023 at 12:06, Takamichi Osumi (Fujitsu)
> > <osumi.takamichi@fujitsu.com> wrote:
> > >
> > > Updated the comment and the function call.
> > >
> > > Kindly have a look at the updated patch v17.
> >
> > Thanks for the updated patch, few comments:
> > 1) min_apply_delay was accepting values like '600 m s h', I was not
> > sure if we should allow this:
> > alter subscription sub1 set (min_apply_delay = ' 600 m s h');
> >
>
> I think here we should have specs similar to recovery_min_apply_delay.
>
> >
> > 2) How about adding current_txn_wait_time in
> > pg_stat_subscription_stats, we can update the current_txn_wait_time
> > periodically, this will help the user to check approximately how much
> > time is left(min_apply_delay - stat value) before this transaction
> > will be applied in the subscription. If you agree this can be 0002
> > patch.
> >
>
> Do we have any similar stats for recovery_min_apply_delay? If not, I
> suggest let's postpone this to see if users really need such a
> parameter.

I did not find any statistics for recovery_min_apply_delay, ok it can
be delayed to a later time.

Regards,
Vignesh