From: | "Drouvot, Bertrand" <bertranddrouvot(dot)pg(at)gmail(dot)com> |
---|---|
To: | Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com> |
Cc: | Andres Freund <andres(at)anarazel(dot)de>, 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: | 2023-02-07 10:36:48 |
Message-ID: | 04c0c56b-2a82-308d-9419-9ddf79ea01dc@gmail.com |
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Lists: | pgsql-hackers |
Hi,
On 1/11/23 4:23 PM, Drouvot, Bertrand wrote:
> Hi,
>
> On 1/11/23 8:32 AM, Bharath Rupireddy wrote:
>> On Tue, Jan 10, 2023 at 2:03 PM Drouvot, Bertrand
>> <bertranddrouvot(dot)pg(at)gmail(dot)com> wrote:
>>>
>>> Please find attached, V37 taking care of:
>>
>> Thanks. I started to digest the design specified in the commit message
>> and these patches.
>
> Thanks for looking at it!
>
>> Here are some quick comments:
>>
>> 1. Does logical decoding on standby work without any issues if the
>> standby is set for cascading replication?
>>
>
> Without "any issues" is hard to guarantee ;-) But according to my tests:
>
> Primary -> Standby1 with or without logical replication slot -> Standby2 with or without logical replication slot
>
> works as expected (and also with cascading promotion).
> We can add some TAP tests in 0004 though.
Cascading standby tests have been added in V48 attached.
It does test that:
- a sql logical decoding session on the cascading standby get expected output before/after the standby promotion
- a pg_recvlogical logical decoding session on the cascading standby (started before the standby promotion) get expected output before/after the standby promotion
Regards,
--
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com
Attachment | Content-Type | Size |
---|---|---|
v48-0006-Doc-changes-describing-details-about-logical-dec.patch | text/plain | 2.1 KB |
v48-0005-New-TAP-test-for-logical-decoding-on-standby.patch | text/plain | 29.3 KB |
v48-0004-Fixing-Walsender-corner-case-with-logical-decodi.patch | text/plain | 7.7 KB |
v48-0003-Allow-logical-decoding-on-standby.patch | text/plain | 11.8 KB |
v48-0002-Handle-logical-slot-conflicts-on-standby.patch | text/plain | 37.0 KB |
v48-0001-Add-info-in-WAL-records-in-preparation-for-logic.patch | text/plain | 76.2 KB |
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