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
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*