Re: walsender performance regression due to logical decoding on standby changes

On Tue, 2023-05-09 at 12:02 -0700, Andres Freund wrote:
> I don't think the approach of not having any sort of "registry" of
> whether
> anybody is waiting for the replay position to be updated is
> feasible. Iterating over all walsenders slots is just too expensive -

Would it work to use a shared counter for the waiters (or, two
counters, one for physical and one for logical), and just early exit if
the count is zero?

Regards,
    Jeff Davis