| 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: | 2023-11-08 09:49:03 |
| Message-ID: | 2b2c42cc-51f0-445f-aa7a-361b5db8522d@gmail.com |
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| Lists: | pgsql-hackers |
Hi,
On 11/8/23 9:57 AM, Amit Kapila wrote:
> On Wed, Nov 8, 2023 at 12:32 PM Drouvot, Bertrand
> <bertranddrouvot(dot)pg(at)gmail(dot)com> wrote:
>>
>> Hi,
>>
>> On 11/8/23 4:50 AM, Amit Kapila wrote:
>>
>>> I think if we want to follow
>>> this approach then we need to also monitor these slots for any change
>>> in the consecutive cycles and if we are able to sync them then
>>> accordingly we enable them to use after failover.
>>
>> What about to add a new field in ReplicationSlotPersistentData
>> indicating that we are waiting for "sync" and drop such slots during promotion and
>> /or if not in recovery?
>>
>
> This patch is already adding 'synced' flag in
> ReplicationSlotPersistentData to distinguish synced slots so that we
> can disallow decoding on then in standby and disallow to drop those. I
> suggest we change that field to have multiple states where one of the
> states would indicate that the initial sync of the slot is done.
>
Yeah, agree.
Regards,
--
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com
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