RE: [PATCH] Release replication slot on error in SQL-callable slot functions

From: "Zhijie Hou (Fujitsu)" <houzj(dot)fnst(at)fujitsu(dot)com>
To: SATYANARAYANA NARLAPURAM <satyanarlapuram(at)gmail(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
Cc: shveta malik <shveta(dot)malik(at)gmail(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, shveta malik <shvetamalik(at)gmail(dot)com>
Subject: RE: [PATCH] Release replication slot on error in SQL-callable slot functions
Date: 2026-05-29 05:36:49
Message-ID: TY4PR01MB17718C386870F9DAD4B0BF9BC94162@TY4PR01MB17718.jpnprd01.prod.outlook.com
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On Friday, May 29, 2026 1:11 PM SATYANARAYANA NARLAPURAM <satyanarlapuram(at)gmail(dot)com> wrote:
> Thanks for the patches, I combined these changes in my latest patch. Please find the v5.

Thanks for updating the patch.

Few comments:

1.

The patch places PG_CATCH() inside create_logical_replication_slot(), but the
caller may still error out before releasing the slot. It would be better to
catch the error at the caller level instead. The same problem exists in
copy_replication_slot(), which does not include the slot persistence logic
within its CATCH block.

2.

I have a concern about the LWLock handling added within the PG_CATCH block, see [1].

[1] https://www.postgresql.org/message-id/TY4PR01MB17718F04D32E0073F0BC7EC0294082%40TY4PR01MB17718.jpnprd01.prod.outlook.com

Best Regards,
Hou zj

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