Re: Conflict detection for update_deleted in logical replication - Mailing list pgsql-hackers

On Fri, Nov 29, 2024 at 4:05 PM Hayato Kuroda (Fujitsu)
<kuroda.hayato@fujitsu.com> wrote:
>
> 07. wait_for_publisher_status
>
> I think all calculations and checking in the function can be done even on the
> walsender. Based on this, I come up with an idea to reduce the message size:
> walsender can just send a status (boolean) whether there are any running transactions
> instead of oldest xid, next xid and their epoch. Or, it is more important to reduce the
> amount of calc. on publisher side?
>

Won't it be tricky to implement this tracking on publisher side?
Because we not only need to check that there is no running xact but
also that the oldest_running_xact that was present last time when the
status message arrived has finished. Won't this need more bookkeeping
on publisher's side?

--
With Regards,
Amit Kapila.