| From: | "Drouvot, Bertrand" <bertranddrouvot(dot)pg(at)gmail(dot)com> |
|---|---|
| To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Cc: | shveta malik <shveta(dot)malik(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> |
| Subject: | Re: Synchronizing slots from primary to standby |
| Date: | 2023-10-26 12:08:55 |
| Message-ID: | c49d8520-00c7-4d33-959c-26489d275c51@gmail.com |
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| Lists: | pgsql-hackers |
Hi,
On 10/26/23 10:40 AM, Amit Kapila wrote:
> On Wed, Oct 25, 2023 at 8:49 PM Drouvot, Bertrand
> <bertranddrouvot(dot)pg(at)gmail(dot)com> wrote:
>>
>
> Good point, I think we should enhance the WalSndWait() logic to
> address this case.
Agree. I think it would need to take care of the new CV and probably
provide a way for the caller to detect it stopped waiting due to the socket
(I don't think it can find out currently).
> Additionally, I think we should ensure that
> WalSndWaitForWal() shouldn't wait twice once for wal_flush and a
> second time for wal to be replayed by physical standby. It should be
> okay to just wait for Wal to be replayed by physical standby when
> applicable, otherwise, just wait for Wal to flush as we are doing now.
> Does that make sense?
Yeah, I think so. What about moving WalSndWaitForStandbyConfirmation()
outside of WalSndWaitForWal() and call one or the other in logical_read_xlog_page()?
Regards,
--
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com
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