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From: Amit Kapila <amit.kapila16@gmail.com>
Date: Wed, 11 Feb 2026 17:39:37 +0530
Message-ID: <CAA4eK1JWGgQ-6MTBPTEvK9ttBqMAbxsAHNay8RjEg9AaxeyS2A@mail.gmail.com>
Subject: Re: [PATCH] Add max_logical_replication_slots GUC
To: Ahmed Et-tanany <ahmed.ettanany@aiven.io>
Cc: Fujii Masao <masao.fujii@gmail.com>, =?UTF-8?Q?=C3=81lvaro_Herrera?= <alvherre@kurilemu.de>, 
	pgsql-hackers@lists.postgresql.org
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On Thu, Jan 29, 2026 at 6:31=E2=80=AFPM Ahmed Et-tanany <ahmed.ettanany@aiv=
en.io> wrote:
>
> On Thu, Jan 29, 2026 at 12:39=E2=80=AFPM Fujii Masao <masao.fujii@gmail.c=
om> wrote:
>>
>>
>> Would something like max_logical_wal_senders also be needed for your pur=
pose?
>> Otherwise, logical replication connections could exhaust max_wal_senders=
 and
>> prevent physical replication connections from being established.
>>
>> That said, adding two separate GUC parameters (i.e.,
>> max_logical_replication_slots
>> and max_logical_wal_senders) for this purpose doesn't seem like a
>> great solution,
>> though...
>>
>
> That's a great point! I'm thinking we could potentially avoid
> introducing a separate max_logical_wal_senders GUC by reusing
> max_logical_replication_slots to decide whether a WAL sender can
> start for logical replication.
>

Won't the walsender automatically exit if the
max_logical_replication_slots is reached? If so, do we really need a
separate GUC to control logical walsenders?

--=20
With Regards,
Amit Kapila.