Re: Fix detection of truncated zstd-compressed backups

From: Daniel Gustafsson <daniel(at)yesql(dot)se>
To: Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com>
Cc: Japin Li <japinli(at)hotmail(dot)com>, Zsolt Parragi <zsolt(dot)parragi(at)percona(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Osama Abdul Qader <osamaabdulqader(dot)cs(at)gmail(dot)com>
Subject: Re: Fix detection of truncated zstd-compressed backups
Date: 2026-08-13 20:57:29
Message-ID: D8E3F994-FA42-4483-9905-D612DEFE7763@yesql.se
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> On 13 Aug 2026, at 07:11, Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com> wrote:

> PFA v7: addressed Jipan’s comment.

Sorry for being slow on this, things are quite busy but I hope to have a review
soon. While poking at this I realized that our compression code in pg_dump
likely has the same issue. I hacked up a quick PoC diff (attached) but it's
untested (can one actually test the data-in-zstd-internal-buffers case at all?)
and mainly a sketch. If you want to pick it up and rework into this patchset
to tackle it treewide then that would be fantastic.

--
Daniel Gustafsson

Attachment Content-Type Size
pg_dump.diff.txt text/plain 1.4 KB

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