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*
