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From: Amit Kapila <[email protected]>
To: Alvaro Herrera <[email protected]>
Cc: [email protected] <[email protected]>
Cc: Peter Smith <[email protected]>
Cc: Tomas Vondra <[email protected]>
Cc: Euler Taveira <[email protected]>
Cc: [email protected] <[email protected]>
Cc: Greg Nancarrow <[email protected]>
Cc: vignesh C <[email protected]>
Cc: Ajin Cherian <[email protected]>
Cc: [email protected] <[email protected]>
Cc: Dilip Kumar <[email protected]>
Cc: Rahila Syed <[email protected]>
Cc: Peter Eisentraut <[email protected]>
Cc: Önder Kalacı <[email protected]>
Cc: japin <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: David Steele <[email protected]>
Cc: Craig Ringer <[email protected]>
Cc: Amit Langote <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: row filtering for logical replication
Date: Thu, 14 Apr 2022 08:45:05 +0530
Message-ID: <CAA4eK1KmHUPcHXjU7BLKCb-QBUcdoFWTGr8QRahNePHgh5qtzg@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CAA4eK1Lpr7fE1z-aP6aCQbsS8c3CUdXqCqTuDR4KmBxR8VpG_Q@mail.gmail.com>
	<[email protected]>

On Wed, Apr 13, 2022 at 10:01 PM Alvaro Herrera <[email protected]> wrote:
>
> BTW I just noticed that AlterPublicationOptions acquires only
> ShareAccessLock on the publication object.  I think this is too lax ...
> what if two of them run concurrently? (say to specify different
> published actions)  Do they overwrite the other's update?
>

No, they won't overwrite. Firstly the AccessShareLock on the
publication object is not related to concurrent change of the
publication object. They will be protected by normal update-row rules
(like till the first transaction finishes, the other will wait). See
an example below:

Session-1
postgres=# Begin;
BEGIN
postgres=*# Alter publication pub1 set (publish = 'insert');
ALTER PUBLICATION

Session-2:
postgres=# Begin;
BEGIN
postgres=*# Alter publication pub1 set (publish = 'update');

The Alter in Session-2 will wait till we end the transaction in Session-1.


-- 
With Regards,
Amit Kapila.

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