From: | shveta malik <shveta(dot)malik(at)gmail(dot)com> |
---|---|
To: | vignesh C <vignesh21(at)gmail(dot)com> |
Cc: | Peter Smith <smithpb2250(at)gmail(dot)com>, Shlok Kyal <shlok(dot)kyal(dot)oss(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Peter Eisentraut <peter(at)eisentraut(dot)org>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Euler Taveira <euler(at)eulerto(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>, Hou, Zhijie/侯 志杰 <houzj(dot)fnst(at)fujitsu(dot)com>, "Jonathan S(dot) Katz" <jkatz(at)postgresql(dot)org>, shveta malik <shveta(dot)malik(at)gmail(dot)com> |
Subject: | Re: Logical Replication of sequences |
Date: | 2024-07-25 10:10:58 |
Message-ID: | CAJpy0uCLRAPyoN3DJo7WuKtX0zyq9mQoaOwjVieCyDkE_shZkg@mail.gmail.com |
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Lists: | pgsql-hackers |
On Thu, Jul 25, 2024 at 12:08 PM shveta malik <shveta(dot)malik(at)gmail(dot)com> wrote:
>
> On Thu, Jul 25, 2024 at 9:06 AM vignesh C <vignesh21(at)gmail(dot)com> wrote:
> >
> > The attached v20240725 version patch has the changes for the same.
>
> Thank You for addressing the comments. Please review below issues:
>
> 1) Sub ahead of pub due to wrong initial sync of last_value for
> non-incremented sequences. Steps at [1]
> 2) Sequence's min value is not honored on sub during replication. Steps at [2]
One more issue:
3) Sequence datatype's range is not honored on sub during
replication, while it is honored for tables.
Behaviour for tables:
---------------------
Pub: create table tab1( i integer);
Sub: create table tab1( i smallint);
Pub: insert into tab1 values(generate_series(1, 32768));
Error on sub:
2024-07-25 10:38:06.446 IST [178680] ERROR: value "32768" is out of
range for type smallint
---------------------
Behaviour for sequences:
---------------------
Pub:
CREATE SEQUENCE myseq_i as integer INCREMENT 10000 START 1;
Sub:
CREATE SEQUENCE myseq_i as smallint INCREMENT 10000 START 1;
Pub:
SELECT nextval('myseq_i');
SELECT nextval('myseq_i');
SELECT nextval('myseq_i');
SELECT nextval('myseq_i');
SELECT nextval('myseq_i'); -->brings value to 40001
Sub:
ALTER SUBSCRIPTION sub1 REFRESH PUBLICATION SEQUENCES;
SELECT * from pg_sequences; -->last_val reached till 40001, while the
range is till 32767.
thanks
Shveta
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