Horton

Re: PG 16 draft release notes ready

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: Bruce Momjian <bruce@momjian.us>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2023-05-22T17:59:36Z
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. Revert MAINTAIN privilege and pg_maintain predefined role.

  2. doc: PG 16 relnotes, remove "Have initdb use ICU by default"

  3. initdb: change default --locale-provider back to libc.

  4. doc: PG 16 relnotes, add author

  5. doc: PG 16 relnotes, move memory item and reword OUTER item

  6. doc: PG 16 relnotes, add memory overhead reduction item

  7. doc: PG 16 relnotes, adjust subscription origin mention

  8. doc: PG 16 relnotes, adjust auto_explain logging item

  9. doc: PG 16 relnotes: adjust outer/full hash join parallelization

  10. doc: PG 16 relnotes, fix duplicate author and commit

  11. doc: PG 16 relnotes, fix "locale" typo and windows locale text

  12. doc: PG 16 relnotes, add author from previous merge

  13. doc: PG 16 relnotes, wording adjustments

  14. doc: PG 16 relnotes, merge and move vector items

  15. doc: PG 16 relnotes, update xid/subxid searches item

  16. doc: PG 16 relnotes, SIMD improvements

  17. doc: PG 16 relnotes, add major features list

  18. doc: PG 16 relnotes, misc merged items and bootstrap detail

  19. doc: PG 16 relnotes, misc. updates

  20. doc: PG 16 relnotes, add commits

  21. Allow logical decoding on standbys

  22. Fix ts_headline() edge cases for empty query and empty search text.

  23. Add a hook for modifying the ldapbind password

  24. Rework design of functions in pg_walinspect

  25. initdb: derive encoding from locale for ICU; similar to libc.

  26. Doc: add XML ID attributes to <sectN> and <varlistentry> tags.

  27. Simplify the implementations of the to_reg* functions.

  28. Rename pg_dissect_walfile_name() to pg_split_walfile_name()

  29. Make materialized views participate in predicate locking

  30. Improve performance of and reduce overheads of memory management

  31. Allow grant-level control of role inheritance behavior.

Hi,

On 2023-05-21 22:46:58 -0400, Bruce Momjian wrote:
> > Looking through the release notes, I didn't see an entry for
> >
> > commit c6e0fe1f2a08505544c410f613839664eea9eb21
> > Author: David Rowley <drowley@postgresql.org>
> > Date:   2022-08-29 17:15:00 +1200
> >
> >     Improve performance of and reduce overheads of memory management
> >
> > even though I think that's one of the more impactful improvements. What was
> > the reason for leaving that out?
>
> If you read my previous email:
>
> > For the above two items, I mention items that would change user
> > like new features or changes that are significant enough that they would
> > change user behavior.  For example, if a new join method increases
> > performance by 5x, that could change user behavior.  Based on the quoted
> > numbers above, I didn't think "hash now faster" would be appropriate to
> > mention.  Right?

I continue, as in past releases, to think that this is a bad policy. For
existing workloads performance improvements are commonly a more convincing
reason to upgrade than new features - they allow users to scale the workload
further, without needing application changes.

Of course there are performance improvement that are too miniscule to be worth
mentioning, but it's not a common case.

And here it's not just performance, but also memory usage, including steady
state memory usage.


> I can see this item as a big win, but I don't know how to describe it in a way
> that is helpful for the user to know.

In doubt the subject of the commit would just work IMO.

Greetings,

Andres Freund