| From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
|---|---|
| To: | Bowen Shi <zxwsbg12138(at)gmail(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, Melanie Plageman <melanieplageman(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Alexander Lakhin <exclusion(at)gmail(dot)com>, PostgreSQL mailing lists <pgsql-bugs(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: relfrozenxid may disagree with row XIDs after 1ccc1e05ae |
| Date: | 2024-05-17 04:28:57 |
| Message-ID: | CAH2-Wzk8BgAwKGOttaimEwSHXVC7+L1Wg6uEYb9Nuv6RJbemZQ@mail.gmail.com |
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| Lists: | pgsql-bugs |
On Thu, May 16, 2024 at 11:36 PM Bowen Shi <zxwsbg12138(at)gmail(dot)com> wrote:
> From the current situation, I feel that the scenario I encountered is different from yours because it doesn't seem to be the first page of the vacuum scanning.
Really? I think it looks like the same issue.
What I saw was that the heap page that lazy_scan_prune locked up on
was the first page scanned *after* the first round of index vacuuming
-- *not* the first heap page scanned overall.
I also saw "num_index_scans == 1", "tuples_deleted == lpdead_items",
and "scanned_pages == lpdead_item_pages" when I looked at the locked
up Postgres 15 production instance (or close to it). I can't tell if
your dead_items is shown as empty, too, but if it is then that
indicates that the heap page that your lazy_scan_prune trace relates
to is the first page scanned after a round of index vacuuming (the
first round).
If you can show more about dead_items, then it will either confirm or
disprove my theory about it being the same issue.
--
Peter Geoghegan
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