Re: Synchronizing slots from primary to standby - Mailing list pgsql-hackers

On Tue, Oct 24, 2023 at 11:54 AM Drouvot, Bertrand
<bertranddrouvot.pg@gmail.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.pg@gmail.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