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In-Reply-To: <aZaO8pPLlYmcNaB2@paquier.xyz>
From: Nitin Jadhav <nitinjadhavpostgres@gmail.com>
Date: Fri, 6 Mar 2026 11:02:41 +0530
Message-ID: 
 <CAMm1aWZbQ-Acp_xAxC7mX9uZZMH8+NpfepY9w=AOxbBVT9E=uA@mail.gmail.com>
Subject: 
 =?UTF-8?Q?Re=3A_Change_checkpoint=E2=80=91record=E2=80=91missing_PANIC_to_FA?=
	=?UTF-8?Q?TAL?=
To: Michael Paquier <michael@paquier.xyz>
Cc: Pg Hackers <pgsql-hackers@postgresql.org>
Content-Type: multipart/mixed; boundary="000000000000e93a7f064c546321"
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--000000000000e93a7f064c546321
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

> Thanks, Nitin.  Perhaps it would be a better approach to split the
> patch into multiple pieces, with the most relevant PANIC->FATAL
> switches and the most critical tests on top of the rest.  It would be
> nice to get most of that by the end of the release cycle, or a rather
> "good" chunk of it.

Thanks for the suggestion, Michael, and apologies for the delay. I had
intended to send this sooner, but it took a bit more time.

I=E2=80=99m sharing the two patches below.

Patch 0001 adjusts the error severity during crash recovery when the
checkpoint record referenced by pg_control cannot be located and no
backup_label file is present. The error is lowered from PANIC to
FATAL. This patch also adds a new TAP test that verifies startup fails
with a clear FATAL error. The test is straightforward: it removes the
WAL segment containing the checkpoint record and confirms that the
server reports the expected error.

Patch 0002 adds two TAP tests that exercise similar missing=E2=80=91WAL
scenarios during backup recovery, i.e., when a backup_label file is
present:

Missing checkpoint WAL segment referenced by backup_label:
This test uses an online backup to create a backup_label file,
extracts the checkpoint record information from it, removes the
corresponding WAL segment, and verifies that the server reports the
expected error.

Missing redo WAL segment referenced by the checkpoint:
In this test, redo and checkpoint records are forced into different
WAL segments using injection points. A cold backup is then taken, with
an explicit backup_label created in the restored cluster. The WAL
segment containing the redo record is removed, and startup is expected
to fail with the appropriate error message.

Please review and share your feedback. I=E2=80=99m happy to adjust the patc=
hes
if there are better ways to handle any of these cases, especially the
054_missing_redo_with_backup_label test.

Best Regards,
Nitin Jadhav
Azure Database for PostgreSQL
Microsoft

On Thu, Feb 19, 2026 at 9:48=E2=80=AFAM Michael Paquier <michael@paquier.xy=
z> wrote:
>
> On Thu, Feb 19, 2026 at 08:24:02AM +0530, Nitin Jadhav wrote:
> > I had a quick look at the existing recovery TAP tests and didn=E2=80=99=
t
> > immediately find a case where simply adding log checks would cover
> > these error paths, but I=E2=80=99ll double=E2=80=91check once more befo=
re sending the
> > patch. I=E2=80=99ll work on this and share the patch soon.
>
> Thanks, Nitin.  Perhaps it would be a better approach to split the
> patch into multiple pieces, with the most relevant PANIC->FATAL
> switches and the most critical tests on top of the rest.  It would be
> nice to get most of that by the end of the release cycle, or a rather
> "good" chunk of it.
> --
> Michael

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