| From: | Andrey Silitskiy <a(dot)silitskiy(at)postgrespro(dot)ru> |
|---|---|
| To: | Michael Paquier <michael(at)paquier(dot)xyz> |
| Cc: | "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Vitaly Davydov <v(dot)davydov(at)postgrespro(dot)ru>, "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>, "Takamichi Osumi (Fujitsu)" <osumi(dot)takamichi(at)fujitsu(dot)com>, "sawada(dot)mshk(at)gmail(dot)com" <sawada(dot)mshk(at)gmail(dot)com>, "peter(dot)eisentraut(at)enterprisedb(dot)com" <peter(dot)eisentraut(at)enterprisedb(dot)com>, "dilipbalaut(at)gmail(dot)com" <dilipbalaut(at)gmail(dot)com>, "andres(at)anarazel(dot)de" <andres(at)anarazel(dot)de>, "amit(dot)kapila16(at)gmail(dot)com" <amit(dot)kapila16(at)gmail(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, Greg Sabino Mullane <htamfids(at)gmail(dot)com>, Alexander Korotkov <aekorotkov(at)gmail(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
| Subject: | Re: Exit walsender before confirming remote flush in logical replication |
| Date: | 2026-02-04 14:03:58 |
| Message-ID: | 72f61df5-ff97-43c1-9e98-7ad2a23b78ae@postgrespro.ru |
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On Mon, Feb 2, 2026 at 4:56 PM Michael Paquier
<michael(at)paquier(dot)xyz> wrote:
> Couldn't that be potentially dangerous, particularly if
> wal_sender_shutdown_mode is set to immediate, meaning that it applies
> to all the WAL senders? The WAL receiver side could be on a backend
> with an older backend version than the WAL sender where this new GUC
> exists.
So far, I can't provide a scenario where the old-version receiving side is
having problems due to the behavior of immediate wal_sender_shutdown_mode.
Maybe someone else can.
Even if walsender immediate shutdown mode is set on the sender, it flushes
a done message to the receiver, as it is being done now. In the case
when this
is not possible, it terminates in a similar way as it is currently doing
in WalSndShutdown(), the old receiver also seems to be able to handle this
case.
Regards,
Andrey Silitskiy
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