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

On Wed, Jun 4, 2025 at 6:41 AM Masahiko Sawada <sawada.mshk@gmail.com> wrote:
>
> On Tue, May 20, 2025 at 9:54 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
> >
> > Yeah, I find the idea that the presence of a logical slot will allow
> > the user to enable logical decoding/replication more appealing than
> > this new alternative, leaving aside the challenges of realizing it.

+1. This idea appears more user-friendly and easier to understand
compared to other approaches, such as having multiple GUCs or using
ALTER SYSTEM.

> I've drafted this idea. Here are summary for attached two patches:
>
> 0001 patch allows us to create a logical slot without WAL reservation.
>
> 0002 patch is the main patch for dynamically enabling/disabling
> logical decoding when wal_level is 'replica'.

Thank You for the patches. I have done some initial testing, it seems
to be working well. I will do more testing and review and will share
further feedback.

thanks
Shveta