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From: Thomas Munro <[email protected]>
To: Tomas Vondra <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: Andrew Dunstan <[email protected]>
Cc: Amul Sul <[email protected]>
Cc: Zsolt Parragi <[email protected]>
Cc: Robert Haas <[email protected]>
Cc: Chao Li <[email protected]>
Cc: Anthonin Bonnefoy <[email protected]>
Cc: Fujii Masao <[email protected]>
Cc: Jakub Wartak <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: pg_waldump: support decoding of WAL inside tarfile
Date: Mon, 30 Mar 2026 11:20:24 +1300
Message-ID: <CA+hUKGJk4uw5Cdx8+m8YPWmDVB_TtrnMJd24_vQHQDXQz9Qzfw@mail.gmail.com> (raw)
In-Reply-To: <CA+hUKGJyvdyWMC-RW1njqevD-q_gTbFq+DyDiFpUJVaG+DY20w@mail.gmail.com>
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On Mon, Mar 30, 2026 at 11:11 AM Thomas Munro <[email protected]> wrote:
> ... so that's a yes, lseek sees holes that we didn't ask it to make,

Oops, sorry, I wrote that email too fast and got my examples mixed up,
BTFS actually *doesnt* do that automatically, that was of course a
trace showing a file with explicitly made holes.  So this is probably
be a ZFS-only issue unless you're using wal_init_zero=0, and then any
file system could result in PAX-sparse-format tarballs, but even then
only if you use non-default switches that in practice no one will use
with GNU tar, or if you use BSD tar.  So in practice this is a
FreeBSD-only issue.

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