| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Jeff Davis <pgsql(at)j-davis(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org, "Drouvot, Bertrand" <bertranddrouvot(dot)pg(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> |
| Subject: | Re: walsender performance regression due to logical decoding on standby changes |
| Date: | 2023-05-09 21:00:24 |
| Message-ID: | 20230509210024.4lfcb2wzrcijzaba@awork3.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2023-05-09 13:38:24 -0700, Jeff Davis wrote:
> 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?
That doesn't really fix the problem - once you have a single walsender
connected, performance is bad again.
Greetings,
Andres Freund
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