Re: Improve pg_sync_replication_slots() to wait for primary to advance

On Tue, Oct 7, 2025 at 5:13 PM shveta malik <shveta(dot)malik(at)gmail(dot)com> wrote:
>
> On Tue, Oct 7, 2025 at 4:49 PM Ashutosh Bapat
> <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> wrote:
> >
> > Shorter nap times mean higher possibility of wasted CPU cycles - that
> > should be avoided. Doing that for a test's sake seems wrong. Is there
> > a way that the naptime can controlled by external factors such as
> > likelihood of an advanced slot (just firing bullets in the dark) or is
> > the naptime controllable by user interface like GUC? The test can use
> > those interfaces.
> >
>
> Yes, we can control naptime based on the fact whether any slots are
> being advanced on primary. This is how a slotsync worker does. It
> keeps on doubling the naptime if there is no activity on primary
> starting from 200ms till max of 30 sec. As soon as activity happens,
> naptime is reduced to 200ms again.
>

Is there a reason why we don't want to use the same naptime strategy
for API and worker?

--
With Regards,
Amit Kapila.