Re: Conflict detection for update_deleted in logical replication

On Tue, May 20, 2025 at 8:38 AM shveta malik <shveta(dot)malik(at)gmail(dot)com> wrote:
>
> Please find few more comments:
>
> 1)
> ProcessStandbyPSRequestMessage:
> + /*
> + * This shouldn't happen because we don't support getting primary status
> + * message from standby.
> + */
> + if (RecoveryInProgress())
> + elog(ERROR, "the primary status is unavailable during recovery");
>
>
> a) This error is not clear. Is it supposed to be user oriented error
> or internal error? As a user, it is difficult to interpret this error
> and take some action.
>

This is an internal error for developers to understand that they have
sent the wrong message. Do you have any suggestions to change it?

> b) What I understood is that there is no user of enabling
> 'retain_conflict_info' for a subscription which is subscribing to a
> publisher which is physical standby too. So shall we emit such an
> ERROR during 'Create Sub(retain_conflict_info=on)' itself? But that
> would need checking whether the publisher is physical standby or not
> during CREATE-SUB. Is that a possibility?
>

The 0003 patch already took care of this, see check_conflict_info_retaintion.

--
With Regards,
Amit Kapila.