Dear Cassandra community,
after upgrading my Cassandra nodes from version 3.11.6 to either 3.11.7 or 3.11.8 I experience a significant increase in read latency. With 3.11.6 average read latency is ~0.35 ms. With 3.11.7 average read latency increases to ~2.9 ms, almost 10 times worse! This behavior applies to all my environments, testing and productive. I do also observe that the "bloom-filter false positive rate" and "SSTable reads" increases significantly with version >= 3.11.7 I'm wondering if someone experienced the same problem when updating Cassandra from 3.11.6 to either 3.11.7 or 3.11.8 and can help me out. I already tried nodetool scrub, sstablescrub, manual compaction, and re pair on selected tables without impact. When downgrading back to 3.11.6 read latency recovers immediately. My update routine is very simple. I'm just stopping the service, install the new version (using apt), and start the service again. One node after the other. As coming from 3.11.6 updating to 3.11.7 (or 3.11.8) is just a patch update and I expect this routine should do well, but maybe I'm missing some important steps here. I can provide more information about my system or configuration if required. Appreciate your support! Kind regards Nico LANCOM Systems GmbH Adenauerstr. 20 / B2 52146 Würselen Deutschland Tel: +49 2405 49936-0 Fax: +49 2405 49936-99 Web: https://www.lancom-systems.de Geschäftsführer: Ralf Koenzen, Stefan Herrlich Sitz der Gesellschaft: Aachen, Amtsgericht Aachen, HRB 16976
