Re: Use SIGTERM instead of SIGUSR1 for slotsync worker to exit during promotion?

[Amit Kapila]

On Wed, Mar 18, 2026 at 9:35 PM Fujii Masao <masao.fu...@gmail.com> wrote:
>
> I noticed that during standby promotion the startup process sends SIGUSR1 to
> the slotsync worker to make it exit. Is there a reason for using SIGUSR1?
>

IIRC, this same signal is used for both the backend executing
pg_sync_replication_slots() and slotsync worker. We want the worker to
exit and error_out backend. Using SIGTERM for backend could result in
its exit. Also, we want the last slotsync cycle to complete before
promotion so that chances of subscribers that do failover/switchover
to new primary has better chances of finding failover slots
sync-ready.

-- 
With Regards,
Amit Kapila.