Horton

RE: [PoC] pg_upgrade: allow to upgrade publisher node

Hayato Kuroda (Fujitsu) <kuroda.hayato@fujitsu.com>

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From: "Hayato Kuroda (Fujitsu)" <kuroda.hayato@fujitsu.com>
To: 'Peter Smith' <smithpb2250@gmail.com>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, Julien Rouhaud <rjuju123@gmail.com>, Amit Kapila <amit.kapila16@gmail.com>
Date: 2023-04-11T10:30:35Z
Lists: pgsql-hackers 
Dear Peter,

Thank you for giving explanation.

> 
> Hopefully, someone will correct me if this explanation is wrong, but
> my understanding of the different prefixes is like this --
> 
> "XXX" is used as a marker for future developers to consider maybe
> revisiting/improving something that the comment refers to
> e.g.
> /* XXX - it would be better to code this using blah but for now we did
> not.... */
> /* XXX - option 'foo' is not currently supported but... */
> /* XXX - it might be worth considering adding more checks or an assert
> here because... */
> 
> OTOH, "Note" is just for highlighting why something is the way it is,
> but with no implication that it should be revisited/changed in the
> future.
> e.g.
> /* Note: We deliberately do not test the state here because... */
> /* Note: This memory must be zeroed because... */
> /* Note: This string has no '\0' terminator so... */

I confirmed that current "XXX" comments must be removed by improving
or some decision. Therefore I kept current annotation.

Best Regards,
Hayato Kuroda
FUJITSU LIMITED

Commits

  1. Fix issues in binary_upgrade_logical_slot_has_caught_up().

  2. Fix a random failure in 003_logical_slots.pl.

  3. Fix a test in 003_logical_slots.

  4. Fix uninitialized slot array access during the upgrade.

  5. Fix the test 003_logical_slots.

  6. Commit b195e6d482 forgot to update meson.build.

  7. Use shorter file names in the upgrade logical slots test.

  8. Migrate logical slots to the new node during an upgrade.

  9. Flush logical slots to disk during a shutdown checkpoint if required.

  10. Prevent possibility of panics during shutdown checkpoint.