Re: Improve pg_sync_replication_slots() to wait for primary to advance

On Tue, Aug 5, 2025 at 9:28 AM shveta malik <shveta(dot)malik(at)gmail(dot)com> wrote:
>
> On Mon, Aug 4, 2025 at 3:41 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> >
> > On Mon, Aug 4, 2025 at 12:19 PM shveta malik <shveta(dot)malik(at)gmail(dot)com> wrote:
>
> If we want to avoid continuously syncing newly added slots in later
> cycles and instead focus only on the ones that failed to sync during
> the first attempt, one approach is to maintain a list of failed slots
> from the initial cycle and only retry those in subsequent attempts.
> But this will add complexity to the implementation.
>

There will be some additional code for this but overall it improves
the code in the lower level functions. We may want to use the existing
remote_slot list for this purpose.

The current proposed change in low-level functions appears to be
difficult to maintain, especially the change proposed in
update_and_persist_local_synced_slot(). If we can find a better way to
achieve the same then we can consider the current approach as well.

--
With Regards,
Amit Kapila.