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From: shveta malik <shveta.malik@gmail.com>
Date: Wed, 8 Jul 2026 09:37:51 +0530
Message-ID: 
 <CAJpy0uD88AsDe=DJsnd5pD2_J9hDdSpwL+b8xcMfMJ+X9JZtSQ@mail.gmail.com>
Subject: Re: [PATCH] Preserve replication origin OIDs in pg_upgrade
To: Rui Zhao <zhaorui126@gmail.com>
Cc: Ajin Cherian <itsajin@gmail.com>,
 Zsolt Parragi <zsolt.parragi@percona.com>,
	pgsql-hackers@lists.postgresql.org, Shlok Kyal <shlok.kyal.oss@gmail.com>,
	shveta malik <shveta.malik@gmail.com>
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On Mon, Jul 6, 2026 at 6:40=E2=80=AFPM Rui Zhao <zhaorui126@gmail.com> wrot=
e:
>
> Hi Ajin,
>
> Shveta's right, sorry for the noise -- git am --3way applies v10 cleanly =
on
> HEAD (9d1188f298) and it builds. "git apply --check" was tripping on the
> shifted pg_proc.dat hunk on my end.
>
> Confirmed Shveta's (6), and it's a crash, not just a bad read:

Thanks for verifying it.

>   cluster->sub_retain_dead_tuples =3D (strcmp(PQgetvalue(res, 0,
> i_retain_dead_tuples), "t") =3D=3D 0);
>
> With no subscriptions the < 1900 query returns zero rows, PQgetvalue(res,=
 0,
> ...) returns NULL for a nonexistent row, and the strcmp segfaults (reprod=
uced
> with a small libpq program). Upgrading a v17/v18 cluster that has no
> subscriptions hits it. Shveta's "SELECT false" fix is right.
>
> A few more comments from re-reading v10:
>
> 1) The doc hunk updates this sentence:
>
>     -     Commit timestamps and origin data are not preserved during
> the upgrade.
>     +     Commit timestamps are not preserved during the upgrade.
>
> but the twin comment in pg_upgrade.c (~line 222) is left unchanged and ne=
eds
> the same edit:
>
>      * upgrade. Additionally, commit timestamps and origin data are not
>      * preserved during the upgrade. So, even after creating the slot, th=
e
>
> 2) dumpReplicationOrigins:
>
>     + appendPQExpBufferStr(buf,
>     + "SELECT o.*, os.remote_lsn "
>     + "FROM pg_catalog.pg_replication_origin o "
>     + "LEFT OUTER JOIN pg_catalog.pg_replication_origin_status os ON
> o.roident =3D os.local_id ");
>
> No ORDER BY, so the output order is whatever the heap returns; every othe=
r
> query in pg_dumpall.c has one. ORDER BY o.roident would keep the dump sta=
ble.

+1

>
> 3) Trivia: trailing space in the section header --
>
>     + fprintf(OPF, "--\n-- Replication Origins \n--\n\n");
>
> and a stray blank line at the end of replorigin_create_with_id():
>
>     +    false /* WAL log */);
>     + }
>     +
>     +}
>
> Also, per my earlier mail, the >=3D 905 / >=3D 90500 gates can come out n=
ow that
> 14d8418083 raised the pg_upgrade floor to v10.
>
> Thanks,
> Rui