| From: | "Andrey M(dot) Borodin" <x4mmm(at)yandex-team(dot)ru> |
|---|---|
| To: | Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> |
| Cc: | Daniel Verite <daniel(at)manitou-mail(dot)org>, Peter Eisentraut <peter(at)eisentraut(dot)org>, Jelte Fennema-Nio <postgres(at)jeltef(dot)nl>, Sergey Prokhorenko <sergeyprokhorenko(at)yahoo(dot)com(dot)au>, Przemysław Sztoch <przemyslaw(at)sztoch(dot)pl>, Michael Paquier <michael(at)paquier(dot)xyz>, Aleksander Alekseev <aleksander(at)timescale(dot)com>, Pgsql-Hackers Mailing List <pgsql-hackers(at)postgresql(dot)org>, "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Mat Arye <mat(at)timescaledb(dot)com>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, Nikolay Samokhvalov <samokhvalov(at)gmail(dot)com>, Junwang Zhao <zhjwpku(at)gmail(dot)com>, Stepan Neretin <sncfmgg(at)gmail(dot)com> |
| Subject: | Re: UUID v7 |
| Date: | 2024-12-04 16:44:54 |
| Message-ID: | ED7B780C-C45E-40D1-ACA2-597DFC77428E@yandex-team.ru |
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| Lists: | pgsql-hackers |
> On 2 Dec 2024, at 11:00, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
>
> The monotonicity of generated UUIDv7 is guaranteed only within a
> single backend.
I've addressed all items, except formatting a table... I can't build docs to make a reasonable judgement if the table looks OK.
Changes:
- restored leakproof flag of functions without arguments to be consistent with gen_random_uuid()
- improved uuidv7() synopsis
Also PFA a prototype of making uuidv7() ordered across all backends via keeping previous_ns in shared memory. IMO it's overcomplicating and RFC does not require such guarantees. Also, this would cost us several hundreds of ns on each uuidv7() call. I think we should focus on committing existing implementation and leave such things for a future improvement.
Thanks!
Best regards, Andrey Borodin.
| Attachment | Content-Type | Size |
|---|---|---|
| v41-0001-Add-UUID-version-7-generation-function.patch | application/octet-stream | 21.2 KB |
| v41-0003-Make-UUIDv7-ordered-across-all-backends.patch | application/octet-stream | 3.8 KB |
| v41-0002-Fixes-to-address-review-notes-by-Peter-Eisentrau.patch | application/octet-stream | 9.2 KB |
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