Thank you for reaching out, and for planning the upgrade! Upgrading from 3.0.14 to 3.0.27 would be best, followed by upgrading to 4.0.4.
3.0.14 contains a number of serious bugs that are resolved in more recent 3.0.x releases (3.0.19+ are generally good/safe). Upgrading to 3.0.27 will put you on a great 3.0.x build. If all looks good from there, you should have an easy upgrade to 4.0.4. I would not recommend passing through intermediate 3.0.x releases on the way to 3.0.27; doing so is not necessary. Cheers, - Scott > On Jun 13, 2022, at 10:17 PM, Runtian Liu <curly...@gmail.com> wrote: > > > Hi, > > I am running Cassandra version 3.0.14 at scale on thousands of nodes. I am > planning to do a minor version upgrade from 3.0.14 to 3.0.26 in a safe > manner. My eventual goal is to upgrade from 3.0.26 to a major release 4.0. > > As you know, there are multiple minor releases between 3.0.14 and 3.0.26, so > I am planning to upgrade in 2-3 batches say 1) 3.0.14 → 3.0.16 2) 3.0.16 to > 3.0.20 3) 3.0.20 → 3.0.26. > . Do you have suggestions or anything that I need to be aware of? Is there > any minor release between 3.0.14 and 3.0.26, which is not safe etc.? > > Best regards. >
