On 5/16/23 05:59, Konstantin Shalygin wrote:
Hi Mark!
Thank you very much for this message, acknowledging the problem publicly is the beginning of fixing it ❤️
Thanks Konstantin! For what it's worth, I think all of these topics
have been discussed publicly (and some quite extensively!) during the
weekly ceph community performance call over the past year or two.
There's been no intention to hide them, they were just never really
summarized on the mailing list until now.
On 11 May 2023, at 17:38, Mark Nelson <mark.nelson@xxxxxxxxx> wrote:
Hi Everyone,
This email was originally posted to dev@xxxxxxx, but Marc mentioned that he thought this would be useful to post on the user list so I'm re-posting here as well.
Is there any plan/way to the fix performance regressions the current even release (e.g. 16), which can work no worse than release 14? The 16.2.14 release should fix the last issues that block updates (such as the inability to delete old snapshots). I'm concern because of the Ceph release cycle, which obliges the old release to EOL. The solution at least in the form "you need to redeploy all our OSD's", due impossibility RocksDB version migrations - seems okay. This is important for the development of internal products (based on RADOS as backend), whether it is worth putting into the team roadmaps the writing of "migrators from one cluster to another" on application level or, in principle, preparing to live forever on version 14 and, accordingly, take into account its scaling limits
I'm afraid it will take some work to get the performance back after the
revocation of the WAL log recycling optimization. I see Igor's WAL work
as the best path forward for that, but if that doesn't work out we could
try Sage's idea listed in the PR I mentioned. It would be a project though.
Thanks,
k
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Best Regards,
Mark Nelson
Head of R&D (USA)
Clyso GmbH
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