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

Michael Banck <mbanck@gmx.net>

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From: Michael Banck <mbanck@gmx.net>
To: Tomas Vondra <tomas@vondra.me>
Cc: Daniel Gustafsson <daniel@yesql.se>, Andres Freund <andres@anarazel.de>, Bernd Helmle <mailings@oopsware.de>, Michael Paquier <michael@paquier.xyz>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2026-02-09T07:52:10Z
Lists: pgsql-hackers 
Hi,

On Fri, Feb 06, 2026 at 12:15:27AM +0100, Tomas Vondra wrote:
> It's a bit unfortunate we only detect invalid checksums if the failures
> appear in the server log. I wonder if we could run pg_checksums after
> the cluster gets shut down in 'fast' mode (we can't do that with
> immediate shutdowns, of course).

Well, maybe we could do that with immediate shutdowns if we add a
--force parameter to pg_checksums that is clearly labelled/docmented as
being dangerous for running instances (but the instance wouldn't run in
this case).  Or something undocumented like
--debug-force-unclean-controlfile.


Michael

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