Re: [PATCH] Add max_logical_replication_slots GUC

On Thu, Jan 29, 2026 at 12:39 PM Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:

> Would something like max_logical_wal_senders also be needed for your
> purpose?
> 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...
>

For my purpose, it doesn't actually seem that I would need
max_logical_wal_senders to limit WAL senders. Since each logical connection
always requires a logical replication slot, the actual number of active
logical connections (and logical WAL senders) would ultimately be bounded
by max_logical_replication_slots. My main concern is therefore slot
exhaustion rather than the WAL sender limit.

--
Ahmed Et-tanany
Aiven: https://aiven.io/