Re: Logical Replication of sequences

From: vignesh C <vignesh21(at)gmail(dot)com>
To: shveta malik <shveta(dot)malik(at)gmail(dot)com>
Cc: Peter Smith <smithpb2250(at)gmail(dot)com>, Nisha Moond <nisha(dot)moond412(at)gmail(dot)com>, "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Shlok Kyal <shlok(dot)kyal(dot)oss(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Peter Eisentraut <peter(at)eisentraut(dot)org>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Euler Taveira <euler(at)eulerto(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, "Zhijie Hou (Fujitsu)" <houzj(dot)fnst(at)fujitsu(dot)com>, "Jonathan S(dot) Katz" <jkatz(at)postgresql(dot)org>
Subject: Re: Logical Replication of sequences
Date: 2025-05-22 17:12:02
Message-ID: CALDaNm24iG=-Cdfet-dJD5Ef6Rf4qn-86qQbqFUpAXGBMWiYSg@mail.gmail.com
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On Wed, 21 May 2025 at 16:11, shveta malik <shveta(dot)malik(at)gmail(dot)com> wrote:
> Please find few more comments:
>
> 1)
> Temporary sequences will not be replicated, shall we mention this in
> doc under '29.7. Replicating Sequences'?

I added it create publication "ALL SEQUENCES" section as similar
restriction about table is mentioned there

> 2)
> CREATE publication pub1 for all sequences WITH (publish = 'insert,
> update, truncate');
>
> I think it does not make sense to give 'publish' as above (or
> publish_via_partition_root) for 'all sequences' publication. Shall we
> display a WARNING that such will be ignored for 'all sequences' and
> let the create-publication go ahead? Thoughts? Also the doc for
> publish* option in the CREATE-PUBLICATION page needs to specify that
> these options are not-applicable for ALL SEQUENCES publication.

I felt no need to add a warning, just adding to documentation would be enough.

> 3)
> It will be good to move create_publication.sgml as well to the last
> patch where all other doc changes are present. I was trying to find
> this change in the last patch but ultimately found it in pacth002.

Moved

> 4)
> Currently the log is:
>
> ------
> LOG: logical replication sequence synchronization worker for
> subscription "sub1" has started
> LOG: Logical replication sequence synchronization for subscription
> "sub1" - total unsynchronized: 1; batch #1 = 1 attempted, 0 succeeded,
> 1 mismatched
> WARNING: parameters differ for the remote and local sequences
> ("public.myseq34") for subscription "sub1"
> HINT: Alter/Re-create local sequences to have the same parameters as
> the remote sequences.
> WARNING: sequence synchronization worker failed: one or more
> sequences have mismatched parameters between the publisher and
> subscriber
> LOG: logical replication sequence synchronization worker for
> subscription "sub1" has finished
> -----
>
> Do we need both?

Removed it.

The attached v20250522 patch has the changes for the same.

Regards,
Vignesh

Attachment Content-Type Size
v20250522-0001-Introduce-pg_sequence_state-function-for-e.patch text/x-patch 7.2 KB
v20250522-0003-Reorganize-tablesync-Code-and-Introduce-sy.patch text/x-patch 23.0 KB
v20250522-0005-Documentation-for-sequence-synchronization.patch text/x-patch 33.1 KB
v20250522-0002-Introduce-ALL-SEQUENCES-support-for-Postgr.patch text/x-patch 101.7 KB
v20250522-0004-Enhance-sequence-synchronization-during-su.patch text/x-patch 108.2 KB

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