> 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?
sorry, my mistake... I forgot that new release. I would advise to use the latest 3.5.x (3.5.10) version. Best regards, Máté On Tue, Aug 23, 2022 at 11:37 PM Will Now <[email protected]> wrote: > 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! > > > > > >
