Horton

RE: POC: enable logical decoding when wal_level = 'replica' without a server restart

Hayato Kuroda (Fujitsu) <kuroda.hayato@fujitsu.com>

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From: "Hayato Kuroda (Fujitsu)" <kuroda.hayato@fujitsu.com>
To: 'Masahiko Sawada' <sawada.mshk@gmail.com>, Amit Kapila <amit.kapila16@gmail.com>
Cc: shveta malik <shveta.malik@gmail.com>, Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>, Shlok Kyal <shlok.kyal.oss@gmail.com>, Bertrand Drouvot <bertranddrouvot.pg@gmail.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2025-10-16T08:46:39Z
Lists: pgsql-hackers 
Dear Sawada-san,

> It's not harmful in practice. I've considered waking up the postmaster
> with a new PMSignalReason, but I thought it's overkill to introduce a
> new reason just to wake up the postmaster. If there is a convenient
> way, I'd like to use that.

It's not straightforward, but can we reuse SIGHUP signal for the purpose? This
operation actually modifies the GUC parameter wal_level. One downside is that
postmaster will propagated it to all processes, which is not required.

Best regards,
Hayato Kuroda
FUJITSU LIMITED