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Re: Changing the state of data checksums in a running cluster

Daniel Gustafsson <daniel@yesql.se>

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From: Daniel Gustafsson <daniel@yesql.se>
To: Andres Freund <andres@anarazel.de>
Cc: Tomas Vondra <tomas@vondra.me>, Bernd Helmle <mailings@oopsware.de>, Michael Paquier <michael@paquier.xyz>, Michael Banck <mbanck@gmx.net>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2026-02-05T20:01:38Z
Lists: pgsql-hackers

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> On 3 Feb 2026, at 17:58, Daniel Gustafsson <daniel@yesql.se> wrote:

> I've implemented this in the attached patch and it seems very promising.

Turns out I was a bit quick on the send button, and having been focused on the
failing test_checksums suite I missed running the other suites.  (I also
managed to off-by-one-year name it 202503..) Thanks to some quick off-list
feedback, here is an updated version which fixes the failing tests and has
quite a number of smaller touchups.

Like the previous version, I am not sure I have the CHECKPOINT_xxx logic right
and would love some eyes on it.

--
Daniel Gustafsson

Commits

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

  1. Use correct datatype for PID

  2. Improve comments in online checksums code

  3. Fix checksum state transition during promotion

  4. Fix regex searching for page verification failures in tests

  5. Apply data-checksum worker throttling parameters

  6. Skip WAL for unlogged main fork during online checksum enable

  7. Fix data_checksum GUC show_hook

  8. Improve database detection logic in datachecksumsworker

  9. Improve handling of concurrent checksum requests

  10. Typo and spelling fixups for online checksums

  11. Fix invalid checksum state transition in checkpoints

  12. Handle data_checksum state changes during launcher_exit

  13. Test improvements for online checksums

  14. Prevent pg_enable/disable_data_checksums() on standby

  15. Test stabilization for online checksums

  16. Make data checksum tests more resilient for slow machines

  17. Formalize WAL record for XLOG_CHECKPOINT_REDO

  18. Revert "Get rid of WALBufMappingLock"

  19. Get rid of WALBufMappingLock

  20. Improve grammar of options for command arrays in TAP tests