Agreed, I can attest to the importance of this issue as well. The bug is query- and data-dependent, but is such that previously-correct latency metrics that may ordinarily report latency in the 1ms range can incorrectly report latency as 70ms or higher due to measurement error. Users would observe alarmingly high latency stats following upgrade to a build including this bug, though they are not reflective of the actual query execution latency.
This should be a quick patch to apply and re-vote on with a fresh build prepared. – Scott > On Jul 5, 2024, at 10:34 AM, Sam Tunnicliffe <s...@beobal.com> wrote: > > -1 > > I'm afraid we have found an issue with coordinator level latency metrics > being artificially inflated for certain types of queries. > Unfortunately this is a new regression, introduced by CASSANDRA-19534, so we > shouldn't knowingly include it in the release. > The good news is that only a subset of queries are affected and we have a > patch ready, so hopefully it won't delay things too much. > Further details in CASSANDRA-19755 > >> On 2 Jul 2024, at 12:19, Mick Semb Wever <m...@apache.org> wrote: >> >> >> Proposing the test build of Cassandra 5.0-rc1 for release. >> >> sha1: 01eea8a0d74deaede236edb25335fa470502106e >> Git: https://github.com/apache/cassandra/tree/5.0-rc1-tentative >> Maven Artifacts: >> https://repository.apache.org/content/repositories/orgapachecassandra-1337/org/apache/cassandra/cassandra-all/5.0-rc1/ >> >> The Source and Build Artifacts, and the Debian and RPM packages and >> repositories, are available here: >> https://dist.apache.org/repos/dist/dev/cassandra/5.0-rc1/ >> >> 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://github.com/apache/cassandra/blob/5.0-rc1-tentative/CHANGES.txt >> [2]: NEWS.txt: >> https://github.com/apache/cassandra/blob/5.0-rc1-tentative/NEWS.txt >
