Here is CASSANDRA-18097 <https://issues.apache.org/jira/browse/CASSANDRA-18097> with the bug fix for the performance regression encountered with 100 partitions in V2.
On Mon, Dec 5, 2022 at 2:05 PM Marianne Lyne Manaog < marianne.man...@ieee.org> wrote: > Following on what Matt said: > > - Here is the link to the Cassandra repo with the bugfix of wait time from > ms to ns: > https://github.com/apache/cassandra/compare/trunk...marianne-manaog:cassandra:bugfix/wait-from-ms-to-ns > > - the Paxos configuration used is: > > paxos_contention_wait_randomizer: uniform > > paxos_contention_min_wait: 0 > > paxos_contention_max_wait: 100ms > > - V1 and V2 have the same configurations except for paxos_variant: which > changes accordingly > > *Results: V1 (100 partitions)* > > - Average read: 28948 > > - Standard Deviation: 416.271 > > - Coefficient of variance: 1.44% > > - Average write: 19248 > > - Standard Deviation:158.595 > > - Coefficient of variance:0.82% > > *Results: V2 (100 partitions)* > > - Average read: 12307 > > - Standard Deviation: 2367.473 > > - Coefficient of variance: 19.24% > > - Average write: 5780 > > - Standard Deviation: 1154.261 > > - Coefficient of variance: 19.97% > > > On Mon, Dec 5, 2022 at 1:50 PM Matt Fleming <m...@codeblueprint.co.uk> > wrote: > >> Me and Marianne are also still chasing a performance issue with Paxos v2 >> when compared with v1. We >> see way more contention on v2 for a LOCAL_SERIALIZABLE workload that >> writes/reads to only 100 >> partitions (v2 performs better for higher partition counts). We're still >> investigating what's going >> on. >> >> Should that be a -1 vote? I'm not sure :) >> >> On Mon, 5 Dec 2022 at 11:37, Benedict <bened...@apache.org> wrote: >> >>> -0 >>> >>> CASSANDRA-18086 should probably be fixed and merged first, as Paxos v2 >>> will be unlikely to work well for users without it. Either that or we need >>> to update NEWS.txt to mention it. >>> >>> On 5 Dec 2022, at 11:01, Aleksey Yeshchenko <alek...@apple.com> wrote: >>> >>> +1 >>> >>> On 5 Dec 2022, at 10:17, Benjamin Lerer <ble...@apache.org> wrote: >>> >>> +1 >>> >>> Le lun. 5 déc. 2022 à 11:02, Berenguer Blasi <berenguerbl...@gmail.com> >>> a écrit : >>> >>>> +1 >>>> On 5/12/22 10:53, guo Maxwell wrote: >>>> >>>> +1 >>>> >>>> Mick Semb Wever <m...@apache.org>于2022年12月5日 周一下午5:33写道： >>>> >>>>> >>>>> Proposing the test build of Cassandra 4.1.0 GA for release. >>>>> >>>>> sha1: b807f97b37933fac251020dbd949ee8ef245b158 >>>>> Git: >>>>> https://gitbox.apache.org/repos/asf?p=cassandra.git;a=shortlog;h=refs/tags/4.1.0-tentative >>>>> Maven Artifacts: >>>>> https://repository.apache.org/content/repositories/orgapachecassandra-1281/org/apache/cassandra/cassandra-all/4.1.0/ >>>>> >>>>> The Source and Build Artifacts, and the Debian and RPM packages and >>>>> repositories, are available here: >>>>> https://dist.apache.org/repos/dist/dev/cassandra/4.1.0/ >>>>> >>>>> The vote will be open for 72 hours (longer if needed). Everyone who >>>>> has tested the build is invited to vote. Votes by PMC members are >>>>> considered binding. A vote passes if there are at least three binding +1s >>>>> and no -1's. >>>>> >>>>> [1]: CHANGES.txt: >>>>> https://gitbox.apache.org/repos/asf?p=cassandra.git;a=blob_plain;f=CHANGES.txt;hb=refs/tags/4.1.0-tentative >>>>> [2]: NEWS.txt: >>>>> https://gitbox.apache.org/repos/asf?p=cassandra.git;a=blob_plain;f=NEWS.txt;hb=refs/tags/4.1.0-tentative >>>>> >>>> -- >>>> you are the apple of my eye ! >>>> >>>> >>>
