Re: pg_recvlogical: Prevent flushed data from being re-sent after restarting replication

From: Mircea Cadariu <cadariu(dot)mircea(at)gmail(dot)com>
To: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
Cc: PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: pg_recvlogical: Prevent flushed data from being re-sent after restarting replication
Date: 2025-11-24 09:03:41
Message-ID: 201ed97d-e88c-4c89-9cdf-84aab610e8ba@gmail.com
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Hi,

An update: I have two topics from the review perspective.

On the test I proposed to be added to 030_pg_recvlogical.pl, I found a
way to write it without using sleeps (which risk flakyness in CI). I've
attached it as a patch for your consideration. I checked the test in the
following way: on master it fails, but with your patch it passes.

Secondly I noticed in function sendFeedback at line 166, the startpos is
set to output_written_lsn. This seems to counter conceptually the change
you made in the patch, however it seems to not affect correctness. Shall
we remove this line as to avoid confusion?

Attachment Content-Type Size
v1-0001-Add-test-for-pg_recvlogical-reconnection.patch text/plain 5.8 KB

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