Kafka 0.8 is not backward compatible with 0.7. So you can't do inplace upgrade. We do have a migration tool. See https://cwiki.apache.org/confluence/display/KAFKA/Migrating+from+0.7+to+0.8
Thanks, Jun On Thu, Jul 4, 2013 at 7:53 PM, Hanish Bansal < hanish.bansal.agar...@gmail.com> wrote: > Hi All, > > I am using *Kafka-0.7.2 *in distributed mode. > > Now i want to upgrade Kafka version to recent stable release-*0.8 Beta > *with > rolling upgrade without * *any downtime. > > I tried to upgrade one kafka node but after starting that node i am getting > Null Pointer Exception. This may be due *data format mismatch between both > release*. > > My main purpose is to upgrade Kafka without shutting down whole cluster. > > I want to know if on one machine i upgrade Kafka and add that node to same > running cluster while on another machines old Kafka version are running. > Will it create any problem? > > If i upgrade whole cluster to new Kafka version then will it be consistent > with previous data ? > > -- > *Thanks & Regards* > *Hanish Bansal* >
