Re: [HACKERS] make async slave to wait for lsn to be replayed - Mailing list pgsql-hackers

From Amit Kapila
Subject Re: [HACKERS] make async slave to wait for lsn to be replayed
Date
Msg-id CAA4eK1+FsVRV5bH9838XzSRdiB9eKUFcPpGCknhZ9tHePWbuNw@mail.gmail.com
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In response to Re: [HACKERS] make async slave to wait for lsn to be replayed  (Alexander Korotkov <aekorotkov@gmail.com>)
Responses Re: [HACKERS] make async slave to wait for lsn to be replayed
List pgsql-hackers
On Fri, Mar 15, 2024 at 7:50 PM Alexander Korotkov <aekorotkov@gmail.com> wrote:
>
> I went through this patch another time, and made some minor
> adjustments.  Now it looks good, I'm going to push it if no
> objections.
>

I have a question related to usability, if the regular reads (say a
Select statement or reads via function/procedure) need a similar
guarantee to see the changes on standby then do they also always need
to first do something like "BEGIN AFTER '0/3F0FF791' WITHIN 1000;"? Or
in other words, shouldn't we think of something for implicit
transactions?

In general, it seems this patch has been stuck for a long time on the
decision to choose an appropriate UI (syntax), and we thought of
moving it further so that the other parts of the patch can be
reviewed/discussed. So, I feel before pushing this we should see
comments from a few (at least two) other senior members who earlier
shared their opinion on the syntax. I know we don't have much time
left but OTOH pushing such a change (where we didn't have a consensus
on syntax) without much discussion at this point of time could lead to
discussions after commit.

--
With Regards,
Amit Kapila.



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