Re: Introduce XID age and inactive timeout based replication slot invalidation

On Mon, Feb 3, 2025 at 2:55 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
>
> On Fri, Jan 31, 2025 at 5:50 PM Nisha Moond <nisha(dot)moond412(at)gmail(dot)com> wrote:
> >
> > Please find the attached v66 patch set. The base patch(v65-001) is
> > committed now, so I have rebased the patches.
> >
>
> *
> <para>
> The time when the slot became inactive. <literal>NULL</literal> if the
> - slot is currently being streamed.
> + slot is currently being streamed. If the slot becomes invalidated,
> + this value will remain unchanged until server shutdown.
> ...
> @@ -2408,7 +2527,9 @@ RestoreSlotFromDisk(const char *name)
> /*
> * Set the time since the slot has become inactive after loading the
> * slot from the disk into memory. Whoever acquires the slot i.e.
> - * makes the slot active will reset it.
> + * makes the slot active will reset it. Avoid calling
> + * ReplicationSlotSetInactiveSince() here, as it will not set the time
> + * for invalid slots.
> */
> slot->inactive_since = GetCurrentTimestamp();
>
> It looks inconsistent to set inactive_since on restart for invalid
> slots but not at other times. We don't need to set inactive_since for
> invalid slots. The invalid slots should not be updated. Ideally, this
> should be taken care in the patch that introduces inactive_since but
> we can do that now. Let's do this as a separate patch altogether in a
> new thread.

Created a new thread [1] to address the inactive_since update for
invalid slots in a separate patch.

[1] https://www.postgresql.org/message-id/CABdArM7QdifQ_MHmMA%3DCc4v8%2BMeckkwKncm2Nn6tX9wSCQ-%2Biw%40mail.gmail.com

--
Thanks,
Nisha