Thanks for the info. I see in some zk mailing list threads that you've given similar advice in the past such as a March 24 2020 response with details on the underlying cause for concern.
I see now that the latest 3.5.x version is 3.5.10. Is there some reason you quoted 3.5.9 in your original response to me, or should I use the latest 3.5.x, aka 3.5.10? Thanks! You wrote: | ... I would recommend the | following upgrade path: | - 3.4.6 -> 3.4.14 (latest 3.4) | - 3.4.14 -> 3.5.9 (latest 3.5) | - 3.5.9 -> 3.8.0 (currently the latest 3.8) On Tue, Aug 23, 2022 at 6:32 AM Szalay-Bekő Máté <[email protected]> wrote: > yeah, I remember something... > I think that was about the leader election protocol (between ZooKeeper > servers), which changed somewhat around the introduction of dynamic > reconfig, and you need a relatively late ZooKeeper 3.4 version to be able > to communicate (and form a quorum) together with newer ZooKeeper servers. I > am not sure which 3.4 version is safe to use, but I would recommend the > following upgrade path: > - 3.4.6 -> 3.4.14 (latest 3.4) > - 3.4.14 -> 3.5.9 (latest 3.5) > - 3.5.9 -> 3.8.0 (currently the latest 3.8) > > I think I tested these above rolling upgrades already, but I would > definitely advise you to try everything out on some test cluster (with live > test traffic) before you would do it in production. > > I am not sure if 3.4.14 -> 3.8.0 works (I don't remember testing it), but > it might work as well. > > Also some upgrade related info you might find interesting: > https://cwiki.apache.org/confluence/display/ZOOKEEPER/Upgrade+FAQ > > Best regards, > Máté > > On Tue, Aug 23, 2022 at 4:09 AM Will Now <[email protected]> wrote: > > > I'm planning to do a rolling upgrade from 3.4.6 to 3.8.0. While > > researching zookeeper recently I could swear that I stumbled across some > > documentation with some warnings about 3.4.6. Specifically it sounded > like > > you might encounter failures during the upgrade if you jumped straight > from > > 3.4.6 to 3.8.0 (and other newer versions also perhaps). > > > > I recall that it was recommended to first upgrade to 3.4.10 and THEN jump > > to the 3.8.0 version. > > > > I am now feeling like I dreamt all of this because i cannot locate that > > information for the life of me. Does this ring a bell with anyone? > Perhaps > > you can send me a link or tell me I'm losing it (or both)? Thanks! > > >
