| From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Cc: | "houzj(dot)fnst(at)fujitsu(dot)com" <houzj(dot)fnst(at)fujitsu(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Euler Taveira <euler(at)eulerto(dot)com>, "shiy(dot)fnst(at)fujitsu(dot)com" <shiy(dot)fnst(at)fujitsu(dot)com>, Greg Nancarrow <gregn4422(at)gmail(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Ajin Cherian <itsajin(at)gmail(dot)com>, "tanghy(dot)fnst(at)fujitsu(dot)com" <tanghy(dot)fnst(at)fujitsu(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Rahila Syed <rahilasyed90(at)gmail(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Önder Kalacı <onderkalaci(at)gmail(dot)com>, japin <japinli(at)hotmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, David Steele <david(at)pgmasters(dot)net>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: row filtering for logical replication |
| Date: | 2022-04-14 03:15:05 |
| Message-ID: | CAA4eK1KmHUPcHXjU7BLKCb-QBUcdoFWTGr8QRahNePHgh5qtzg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Apr 13, 2022 at 10:01 PM Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> 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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