| From: | shveta malik <shveta(dot)malik(at)gmail(dot)com> |
|---|---|
| To: | "Drouvot, Bertrand" <bertranddrouvot(dot)pg(at)gmail(dot)com> |
| Cc: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>, Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(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>, Ajin Cherian <itsajin(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, shveta malik <shveta(dot)malik(at)gmail(dot)com> |
| Subject: | Re: Synchronizing slots from primary to standby |
| Date: | 2023-10-25 03:00:59 |
| Message-ID: | CAJpy0uCQQb=UK3h5RWO4_r_MVuLKEGZ34hYrqGmDm+3zVvcJgQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Oct 24, 2023 at 11:54 AM Drouvot, Bertrand
<bertranddrouvot(dot)pg(at)gmail(dot)com> wrote:
>
> Hi,
>
> On 10/23/23 2:56 PM, shveta malik wrote:
> > On Mon, Oct 23, 2023 at 5:52 PM Drouvot, Bertrand
> > <bertranddrouvot(dot)pg(at)gmail(dot)com> wrote:
>
> >> We are waiting for DEFAULT_NAPTIME_PER_CYCLE (3 minutes) before checking if there
> >> is new synced slot(s) to be created on the standby. Do we want to keep this behavior
> >> for V1?
> >>
> >
> > I think for the slotsync workers case, we should reduce the naptime in
> > the launcher to say 30sec and retain the default one of 3mins for
> > subscription apply workers. Thoughts?
> >
>
> Another option could be to keep DEFAULT_NAPTIME_PER_CYCLE and create a new
> API on the standby that would refresh the list of sync slot at wish, thoughts?
>
Do you mean API to refresh list of DBIDs rather than sync-slots?
As per current design, launcher gets DBID lists for all the failover
slots from the primary at intervals of DEFAULT_NAPTIME_PER_CYCLE.
These dbids are then distributed among max slot-sync workers and then
they fetch slots for the concerned DBIDs at regular intervals of 10ms
(WORKER_DEFAULT_NAPTIME_MS) and create/update those locally.
thanks
Shveta
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