agora inbox for pgsql-hackers@postgresql.org
help / color / mirror / Atom feedFrom: Antonin Houska <ah@cybertec.at>
To: Alexander Lakhin <exclusion@gmail.com>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Amit Kapila <amit.kapila16@gmail.com>
Cc: Hayato Kuroda (Fujitsu) <kuroda.hayato@fujitsu.com>
Cc: Srinath Reddy Sadipiralla <srinath2133@gmail.com>
Cc: Mihail Nikalayeu <mihailnikalayeu@gmail.com>
Cc: Matthias van de Meent <boekewurm+postgres@gmail.com>
Cc: Pg Hackers <pgsql-hackers@lists.postgresql.org>
Cc: Robert Treat <rob@xzilla.net>
Subject: Re: Adding REPACK [concurrently]
Date: Fri, 10 Apr 2026 12:57:47 +0200
Message-ID: <121156.1775818667@localhost> (raw)
In-Reply-To: <a38fc771-c860-4605-8c44-d16e8aff2534@gmail.com>
References: <202604072027.gazfa2zt2l2j@alvherre.pgsql>
<a38fc771-c860-4605-8c44-d16e8aff2534@gmail.com>
Alexander Lakhin <exclusion@gmail.com> wrote:
> Could you please look at an assertion failure produced by the following
> script, starting from 0d3dba38c:?
> createdb db1
> createdb db2
>
> echo "
> CREATE TABLE t0 (a text);
> BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
> INSERT INTO t0 VALUES ('a');
> SELECT pg_sleep(1);
> " | psql db1 &
>
> echo "
> CREATE TABLE t1 (id int PRIMARY KEY);
> CREATE TABLE t2 (id int PRIMARY KEY, a TEXT, FOREIGN KEY (id) REFERENCES t1);
> SET min_parallel_table_scan_size = 1;
> REPACK (CONCURRENTLY) t2;
> " | psql db2
> wait
>
> It triggers for me:
> TRAP: failed Assert("TransactionIdPrecedesOrEquals(TransactionXmin, RecentXmin)"), File: "procarray.c", Line: 2071, PID: 3529520
Attached is a fix that works for me.
Nevertheless, REPACK (CONCURRENTLY) in your test goes ahead only due to commit
0d3dba38c7, which will probably be reverted [1]. Then REPACK will wait for the
transaction in the other database (db1) to complete before it can actually
start.
Thanks for the report!
[1] https://www.postgresql.org/message-id/cdgw4sbbfcgk6du3iv54r2dgiy4tfywoklbotlmj4irxavdcr3@glxfw5jj277...
--
Antonin Houska
Web: https://www.cybertec-postgresql.com
Attachments:
[text/x-diff] 0001-Do-not-push-the-active-snapshot-for-copy_table_data-.patch (0B, ../121156.1775818667@localhost/2-0001-Do-not-push-the-active-snapshot-for-copy_table_data-.patch)
download
view thread (416+ messages) latest in thread
Message-ID: <121156.1775818667@localhost>
Permalink: ../121156.1775818667@localhost/
Also on: postgresql.org/message-id/121156.1775818667@localhost
reply
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-hackers@postgresql.org
Cc: ah@cybertec.at, exclusion@gmail.com, alvherre@alvh.no-ip.org, amit.kapila16@gmail.com, kuroda.hayato@fujitsu.com, srinath2133@gmail.com, mihailnikalayeu@gmail.com, boekewurm+postgres@gmail.com, pgsql-hackers@lists.postgresql.org, rob@xzilla.net
Subject: Re: Adding REPACK [concurrently]
In-Reply-To: <121156.1775818667@localhost>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox