Horton

Re: pg_upgrade and logical replication

Michael Paquier <michael@paquier.xyz>

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From: Michael Paquier <michael@paquier.xyz>
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: vignesh C <vignesh21@gmail.com>, "Hayato Kuroda (Fujitsu)" <kuroda.hayato@fujitsu.com>, Julien Rouhaud <rjuju123@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2023-09-21T06:07:39Z
Lists: pgsql-hackers 
On Wed, Sep 20, 2023 at 04:54:36PM +0530, Amit Kapila wrote:
> Is the check to ensure remote_lsn is valid correct in function
> check_for_subscription_state()? How about the case where the apply
> worker didn't receive any change but just marked the relation as
> 'ready'?

I may be missing, of course, but a relation is switched to
SUBREL_STATE_READY only once a sync happened and its state was
SUBREL_STATE_SYNCDONE, implying that SubscriptionRelState->lsn is
never InvalidXLogRecPtr, no?

For instance, nothing happens when a
Assert(!XLogRecPtrIsInvalid(rstate->lsn)) is added in
process_syncing_tables_for_apply().
--
Michael

Commits

  1. pg_upgrade: Retrieve subscription count more efficiently.

  2. Fix random failure in 004_subscription.

  3. Fix 004_subscription.pl to allow its usage in --link mode.

  4. Allow upgrades to preserve the full subscription's state.

  5. Prevent startup of logical replication launcher during pg_upgrade