Releases with fixed major.minor version are backward compatible - so 3.4.9 is backward compatible with 3.4.6 (major=3, minor=4 in this case.). Backward compatible means two different versions of client and server can be mixed - in your case it could be 3.4.9 client with 3.4.6 server. So this should work, if not it could be a bug, as it breaks the compatibility guarantee we provided. See https://cwiki.apache.org/confluence/display/ZOOKEEPER/ReleaseManagement for more details on compatibility promise. On Mon, Mar 27, 2017 at 10:05 AM, Irfan Hamid wrote: > Hi, > > We are running 3.4.6 servers and the same client. However, I'm running up > against a bug (ZOOKEEPER-2375) which is fixed in 3.4.9, and I was wondering > if I can just update the client (a much easier proposition) and keep > running 3.4.6 as the quorum servers. > > Regards, > Irfan. > -- Cheers Michael.