Horton

Re: relfrozenxid may disagree with row XIDs after 1ccc1e05ae

Bowen Shi <zxwsbg12138@gmail.com>

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From: Bowen Shi <zxwsbg12138@gmail.com>
To: Melanie Plageman <melanieplageman@gmail.com>
Cc: Robert Haas <robertmhaas@gmail.com>, Matthias van de Meent <boekewurm+postgres@gmail.com>, Noah Misch <noah@leadboat.com>, Peter Geoghegan <pg@bowt.ie>, Alexander Lakhin <exclusion@gmail.com>, PostgreSQL mailing lists <pgsql-bugs@lists.postgresql.org>, Andres Freund <andres@anarazel.de>
Date: 2024-05-16T02:21:59Z
Lists: pgsql-bugs

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Ensure vacuum removes all visibly dead tuples older than OldestXmin

  2. Combine freezing and pruning steps in VACUUM

  3. Handle non-chain tuples outside of heap_prune_chain()

  4. Fix false reports in pg_visibility

  5. Remove retry loop in heap_page_prune().

  6. vacuumlazy.c: document vistest and OldestXmin.

  7. Deduplicate choice of horizon for a relation procarray.c.

  8. Remove tupgone special case from vacuumlazy.c.

  9. Simplify state managed by VACUUM.

  10. Recycle nbtree pages deleted during same VACUUM.

  11. snapshot scalability: Don't compute global horizons while building snapshots.

  12. Raise error when affecting tuple moved into different partition.

On Wed, May 15, 2024 at 9:27 PM Melanie Plageman <melanieplageman@gmail.com>
wrote:


> You saw this problem on PG16? Did you see vacuum hanging or you saw
> some kind of incorrect relfrozenxid advancement? My repro does not
> work for PG16, and I do not see how we could face this problem on
> PG16. It would be very helpful if you have any more details.
>

Yes,  I found the vacuum process hanging in a retry loop on PG16. I think
it was the problem discussed in this thread. Here is some information:

vacrel: OldestXmin = 1106, relfrozenxid = 927
vacrel->vistest: maybe_needed = 1079, definitely_need = 1106

-- 
Regards
Bowen Shi