| From: | Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> |
|---|---|
| To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Cc: | PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Peter Eisentraut <peter(at)eisentraut(dot)org>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Euler Taveira <euler(at)eulerto(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>, Hou, Zhijie/侯 志杰 <houzj(dot)fnst(at)fujitsu(dot)com>, Sawada Masahiko <sawada(dot)mshk(at)gmail(dot)com>, "Katz, Jonathan" <jkatz(at)amazon(dot)com> |
| Subject: | Re: Logical Replication of sequences |
| Date: | 2024-06-06 10:13:53 |
| Message-ID: | CAExHW5vxfti31zgpiY_SVyojZRjc9=ED9TtwjxsLgBK+tU2m4w@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Jun 6, 2024 at 9:22 AM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> On Wed, Jun 5, 2024 at 6:01 PM Ashutosh Bapat
> <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> wrote:
> >
> > On Wed, Jun 5, 2024 at 8:45 AM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
> wrote:
> >>
> >> How about periodically sending this information?
> >> >
> >>
> >> Now, if we want to support some sort of failover then probably this
> >> will help. Do you have that use case in mind?
> >
> >
> > Regular failover was a goal for supporting logical replication of
> sequences. That might be more common than major upgrade scenario.
> >
>
> We can't support regular failovers to subscribers unless we can
> replicate/copy slots because the existing nodes connected to the
> current publisher/primary would expect that. It should be primarily
> useful for major version upgrades at this stage.
>
We don't want to design it in a way that requires major rework when we are
able to copy slots and then support regular failovers. That's when the
consistency between a sequence and the table using it would be a must. So
it's better that we take that into consideration now.
--
Best Wishes,
Ashutosh Bapat
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