| From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
|---|---|
| To: | Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> |
| Cc: | "Zhijie Hou (Fujitsu)" <houzj(dot)fnst(at)fujitsu(dot)com>, shveta malik <shveta(dot)malik(at)gmail(dot)com>, Ajin Cherian <itsajin(at)gmail(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Nisha Moond <nisha(dot)moond412(at)gmail(dot)com>, "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, Bertrand Drouvot <bertranddrouvot(dot)pg(at)gmail(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>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Subject: | Re: Synchronizing slots from primary to standby |
| Date: | 2024-03-01 09:21:42 |
| Message-ID: | CAA4eK1LUMbiwM2V=4vqO9oHC0aLbfohUJdR3Ubt_EYqHrLXm+A@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Mar 1, 2024 at 11:41 AM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
>
> On Fri, Mar 1, 2024 at 12:42 PM Zhijie Hou (Fujitsu)
> <houzj(dot)fnst(at)fujitsu(dot)com> wrote:
> ---
> I was a bit surprised by the fact that standby_slot_names value is
> handled in a different way than a similar parameter
> synchronous_standby_names. For example, the following command doesn't
> work unless there is a replication slot 'slot1, slot2':
>
> =# alter system set standby_slot_names to 'slot1, slot2';
> ERROR: invalid value for parameter "standby_slot_names": ""slot1, slot2""
> DETAIL: replication slot "slot1, slot2" does not exist
>
> Whereas "alter system set synchronous_standby_names to stb1, stb2;"
> can correctly separate the string into 'stb1' and 'stb2'.
>
> Probably it would be okay since this behavior of standby_slot_names is
> the same as other GUC parameters that accept a comma-separated string.
> But I was confused a bit the first time I used it.
>
I think it is better to keep the behavior in this regard the same as
'synchronous_standby_names' because both have similarities w.r.t
replication.
--
With Regards,
Amit Kapila.
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