From: | Justin Pryzby <pryzby(at)telsasoft(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | David Gilman <davidgilman1(at)gmail(dot)com>, pgsql-hackers(at)lists(dot)postgresql(dot)org |
Subject: | Re: "tuple concurrently updated" in pg_restore --jobs |
Date: | 2020-07-10 21:06:07 |
Message-ID: | 20200710210607.GR26220@telsasoft.com |
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Lists: | pgsql-hackers |
On Fri, Jul 10, 2020 at 04:54:40PM -0400, Tom Lane wrote:
> Justin Pryzby <pryzby(at)telsasoft(dot)com> writes:
> > I hit this issue intermittently (roughly half the time) while working with a
> > patch David submitted, and finally found a recipe to reproduce it on an
> > unpatched v12 instance.
>
> > I was surprised to see pg_restore -j2 is restoring ACLs in pre-data in
> > parallel.
>
> It's not pre-data. But it's true that pg_restore figures it can restore
> ACLs in parallel during the ACL-restoring pass, on the theory that pg_dump
> will not emit two different ACL entries for the same object, so that we
> can do all the catalog updates in parallel without conflicts.
>
> This works about 99% of the time, in fact. It falls down in the --clean
Note that this fails for me (sometimes) even without --clean.
$ pg_restore pg_dump.out -j2 -d pryzbyj -v --section pre-data
pg_restore: entering main parallel loop
pg_restore: launching item 3395 ACL TABLE pg_proc
pg_restore: launching item 3396 ACL COLUMN pg_proc.proname
pg_restore: creating ACL "pg_catalog.TABLE pg_proc"
pg_restore: creating ACL "pg_catalog.COLUMN pg_proc.proname"
pg_restore: finished item 3395 ACL TABLE pg_proc
pg_restore: launching item 3397 ACL COLUMN pg_proc.pronamespace
pg_restore: creating ACL "pg_catalog.COLUMN pg_proc.pronamespace"
pg_restore: while PROCESSING TOC:
pg_restore: from TOC entry 3396; 0 0 ACL COLUMN pg_proc.proname postgres
pg_restore: error: could not execute query: ERROR: tuple concurrently updated
Command was: GRANT SELECT(proname) ON TABLE pg_catalog.pg_proc TO PUBLIC;
--
Justin
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