Re: POC: make mxidoff 64 bits

Heikki Linnakangas <hlinnaka@iki.fi>

From: Heikki Linnakangas <hlinnaka@iki.fi>
To: Maxim Orlov <orlovmg@gmail.com>, wenhui qiu <qiuwenhuifx@gmail.com>
Cc: Alexander Korotkov <aekorotkov@gmail.com>, Postgres hackers <pgsql-hackers@lists.postgresql.org>
Date: 2025-04-01T18:26:27Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →
  1. Fix partial read handling in pg_upgrade's multixact conversion

  2. Increase timeout in multixid_conversion upgrade test

  3. Improve sanity checks on multixid members length

  4. Clarify comment on multixid offset wraparound check

  5. Never store 0 as the nextMXact

  6. Add runtime checks for bogus multixact offsets

  7. Widen MultiXactOffset to 64 bits

  8. Move pg_multixact SLRU page format definitions to a separate header

  9. Convert confusing macros in multixact.c to static inline functions

  10. Index SLRUs by 64-bit integers rather than by 32-bit integers

  11. Cope with possible failure of the oldest MultiXact to exist.

Attachments

On 01/04/2025 21:25, Heikki Linnakangas wrote:
> On 07/03/2025 13:30, Maxim Orlov wrote:
>> Here is a rebase, v14.
> 
> Thanks! I did some manual testing of this. I created a little helper 
> function to consume multixids, to test the autovacuum behavior, and 
> found one issue:

Forgot to attach the test function I used, here it is.

-- 
Heikki Linnakangas
Neon (https://neon.tech)