Re: POC: make mxidoff 64 bits

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От Maxim Orlov
Тема Re: POC: make mxidoff 64 bits
Дата
Msg-id CACG=ezYokoiumOFnqUfg_ffHD5s8T+6iHYfzKLfa=QQ-1pNrBg@mail.gmail.com
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Ответ на Re: POC: make mxidoff 64 bits  (wenhui qiu <qiuwenhuifx@gmail.com>)
Список pgsql-hackers
On Tue, 23 Apr 2024 at 12:37, Heikki Linnakangas <hlinnaka@iki.fi> wrote:
This is really a bug fix. It didn't matter when TransactionId and
MultiXactOffset were both typedefs of uint32, but it was always wrong.
The argument name 'xid' is also misleading.

I think there are some more like that, MXOffsetToFlagsBitShift for example.
Yeah, I always thought so too.  I believe, this is just a copy-paste.  You mean, it is worth creating a separate CF 
entry for these fixes?


On Tue, 23 Apr 2024 at 16:03, Andrey M. Borodin <x4mmm@yandex-team.ru> wrote:
BTW as a side note... I see lot's of casts to (unsigned long long), can't we just cast to MultiXactOffset?
Actually, first versions of the 64xid patch set have such a cast to types TransactionID, MultiXact and so on.  But, 
after some discussions, we are switched to unsigned long long cast.  Unfortunately, I could not find an exact link 
for that discussion.  On the other hand, such a casting is already used throughout the code.  So, just for the 
sake of the consistency, I would like to stay with these casts.


On Tue, 23 Apr 2024 at 16:03, wenhui qiu <qiuwenhuifx@gmail.com> wrote:
Hi Maxim Orlov
   Thank you so much for your tireless work on this. Increasing the WAL size by a few bytes should have very little impact with today's disk performance(Logical replication of this feature wal log is also increased a lot, logical replication is a milestone new feature, and the community has been improving the logical replication of functions),I believe removing troubled postgresql Transaction ID Wraparound was also a milestone  new feature  adding a few bytes is worth it!
I'm 100% agree.  Maybe, I should return to this approach and find some benefits for having FXIDs in WAL.

 

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