| From: | "Drouvot, Bertrand" <bertranddrouvot(dot)pg(at)gmail(dot)com> |
|---|---|
| To: | "Zhijie Hou (Fujitsu)" <houzj(dot)fnst(at)fujitsu(dot)com>, shveta malik <shveta(dot)malik(at)gmail(dot)com> |
| Cc: | Peter Smith <smithpb2250(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(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: | 2023-11-28 12:06:47 |
| Message-ID: | 1789e94e-8266-44d1-95e4-7f41abc27d0d@gmail.com |
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| Lists: | pgsql-hackers |
Hi,
On 11/27/23 9:57 AM, Zhijie Hou (Fujitsu) wrote:
> On Monday, November 27, 2023 4:51 PM shveta malik <shveta(dot)malik(at)gmail(dot)com> wrote:
>
> Here is the updated version(v39_2) which include all the changes made in 0002.
> Please use for review, and sorry for the confusion.
>
Thanks!
As far v39_2-0001:
"
Altering the failover option of the subscription is currently not
permitted. However, this restriction may be lifted in future versions.
"
Should we mention that we can alter the related replication slot?
+ <para>
+ The implementation of failover requires that replication
+ has successfully finished the initial table synchronization
+ phase. So even when <literal>failover</literal> is enabled for a
+ subscription, the internal failover state remains
+ temporarily <quote>pending</quote> until the initialization phase
+ completes. See column <structfield>subfailoverstate</structfield>
+ of <link linkend="catalog-pg-subscription"><structname>pg_subscription</structname></link>
+ to know the actual failover state.
+ </para>
I think we have a corner case here. If one alter the replication slot on the primary
then "subfailoverstate" is not updated accordingly on the subscriber. Given the 2 remarks above
would that make sense to prevent altering a replication slot associated to a subscription?
Regards,
--
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com
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