| From: | vignesh C <vignesh21(at)gmail(dot)com> |
|---|---|
| To: | Shlok Kyal <shlok(dot)kyal(dot)oss(at)gmail(dot)com> |
| Cc: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com>, shveta malik <shveta(dot)malik(at)gmail(dot)com>, Shinya Kato <shinya11(dot)kato(at)gmail(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>, "Zhijie Hou (Fujitsu)" <houzj(dot)fnst(at)fujitsu(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Nisha Moond <nisha(dot)moond412(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>, "Jonathan S(dot) Katz" <jkatz(at)postgresql(dot)org> |
| Subject: | Re: Logical Replication of sequences |
| Date: | 2026-01-19 09:24:34 |
| Message-ID: | CALDaNm0FoGdt+1mzua0t-=wYdup5_zmFrvfNf-L=MGBnj9HAcg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, 24 Dec 2025 at 12:15, Shlok Kyal <shlok(dot)kyal(dot)oss(at)gmail(dot)com> wrote:
>
There is a buildfarm failure in fairywren at [1].
The failure occurs when a sequence is dropped concurrently while
pg_get_sequence_data() is being executed as part of the copy_sequences
query. This can be reproduced by pausing execution inside
pg_get_sequence_data() and dropping the sequence in parallel. In such
a case, the function returns NULL values for last_value, which is not
currently expected by the subscriber side and results in a failure.
I am analyzing this scenario further to identify a proper solution. I
will share the detailed analysis and proposed fix in a subsequent
email.
Regards,
Vignesh
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