Re: Minimal logical decoding on standbys

From: "Drouvot, Bertrand" <bertranddrouvot(dot)pg(at)gmail(dot)com>
To: Andres Freund <andres(at)anarazel(dot)de>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Ibrar Ahmed <ibrar(dot)ahmad(at)gmail(dot)com>, Amit Khandekar <amitdkhan(dot)pg(at)gmail(dot)com>, fabriziomello(at)gmail(dot)com, tushar <tushar(dot)ahuja(at)enterprisedb(dot)com>, Rahila Syed <rahila(dot)syed(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Minimal logical decoding on standbys
Date: 2023-02-13 15:27:20
Message-ID: 94d9d47e-72f4-393a-246e-e3fe8db7b741@gmail.com
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Hi,

On 2/7/23 4:29 PM, Drouvot, Bertrand wrote:
> Hi,
>
> On 1/19/23 10:43 AM, Drouvot, Bertrand wrote:
>> Hi,
>>
>> On 1/19/23 3:46 AM, Andres Freund wrote:
>>> Hi,
>>>
>>> On 2023-01-18 11:24:19 +0100, Drouvot, Bertrand wrote:
>>>> On 1/6/23 4:40 AM, Andres Freund wrote:
>>>>> Hm, that's quite expensive. Perhaps worth adding a C helper that can do that
>>>>> for us instead? This will likely also be needed in real applications after all.
>>>>>
>>>>
>>>> Not sure I got it. What the C helper would be supposed to do?
>>>
>>> Call LogStandbySnapshot().
>>>
>>
>> Got it, I like the idea, will do.
>>
>
> 0005 in V49 attached is introducing a new pg_log_standby_snapshot() function
> and the TAP test is making use of it.
>
> Documentation about this new function is also added in the "Snapshot Synchronization Functions"
> section. I'm not sure that's the best place for it but did not find a better place yet.
>

Attaching V50, tiny update in the TAP test (aka 0005) to make use of the wait_for_replay_catchup()
wrapper just added in a1acdacada.

Regards,

--
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com

Attachment Content-Type Size
v50-0006-Doc-changes-describing-details-about-logical-dec.patch text/plain 2.2 KB
v50-0005-New-TAP-test-for-logical-decoding-on-standby.patch text/plain 32.9 KB
v50-0004-Fixing-Walsender-corner-case-with-logical-decodi.patch text/plain 7.7 KB
v50-0003-Allow-logical-decoding-on-standby.patch text/plain 11.8 KB
v50-0002-Handle-logical-slot-conflicts-on-standby.patch text/plain 37.0 KB
v50-0001-Add-info-in-WAL-records-in-preparation-for-logic.patch text/plain 76.2 KB

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