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In-Reply-To: 
 <CAAJ_b94dfQBXaPiZFaVzH=8mCVY6NZ6JEiFXHWph3HYJiSj=1Q@mail.gmail.com>
From: Amul Sul <sulamul@gmail.com>
Date: Sat, 21 Mar 2026 22:56:38 +0530
Message-ID: 
 <CAAJ_b96d0imBJ9Qm93oe40bEZ_4s-u2stM-JB0LYQC5GcjVW-w@mail.gmail.com>
Subject: Re: pg_waldump: support decoding of WAL inside tarfile
To: Andrew Dunstan <andrew@dunslane.net>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Michael Paquier <michael@paquier.xyz>,
	Zsolt Parragi <zsolt.parragi@percona.com>,
 Robert Haas <robertmhaas@gmail.com>,
	Chao Li <li.evan.chao@gmail.com>,
 Jakub Wartak <jakub.wartak@enterprisedb.com>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Content-Type: multipart/mixed; boundary="000000000000f86aec064d8c1c37"
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On Sat, Mar 21, 2026 at 9:05=E2=80=AFPM Amul Sul <sulamul@gmail.com> wrote:
>
> On Sat, Mar 21, 2026 at 5:51=E2=80=AFPM Andrew Dunstan <andrew@dunslane.n=
et> wrote:
> >
> >
> > On 2026-03-21 Sa 2:34 AM, Tom Lane wrote:
> >
> > Michael Paquier <michael@paquier.xyz> writes:
> >
> > On Fri, Mar 20, 2026 at 11:49:02PM -0400, Tom Lane wrote:
> >
> > Buildfarm members batta and hachi don't like this very much.
> >
> > I did not look at what's happening on the host, but it seems like a
> > safe bet to assume that we are not seeing many failures in the
> > buildfarm because we don't have many animals that have the idea to add
> > --with-zstd to their build configuration, like these two ones.
> >
> > That may be part of the story, but only part.  I spent a good deal of
> > time trying to reproduce batta & hachi's configurations locally, on
> > several different platforms, but still couldn't duplicate what they
> > are showing.
> >
> >
> >
> >
> >
> > Yeah, I haven't been able to reproduce it either. But while investigati=
ng I found a couple of issues. We neglected to add one of the tests to meso=
n.build, and we neglected to close some files, causing errors on windows.
> >
>
> While the proposed fix of closing the file pointer before returning is
> correct, we also need to ensure the file is reopened in the next call
> to spill any remaining buffered data. I=E2=80=99ve made a small update to
> Andrew's 0001 patch to handle this. Also, changes to meson.build don't
> seem to be needed as we haven't committed that file yet (unless I am
> missing something).
>
> I=E2=80=99ve also reattached the other patches so they don't get lost: v2=
-0002
> is Andrew's patch for the archive streamer, and v2-0003 is the patch I
> posted previously [1].
>
>

On further thought, I don't think v2-0001 is the right patch. Consider
the case where we write a temporary file partially: if the next
segment required for decoding is that same segment,
TarWALDumpReadPage() will find the physical file present and continue
decoding, potentially triggering an error later due to the shorter
file.

I have attached the v3-0001 patch, which ensures that once we start
writing a temporary file, it should be finished before performing the
lookup. This ensures we don't leave a partial file on disk.

Updated patches are attached; 0002 and 0003 remain the same as before.


Regards,
Amul

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