More information about the issue:
When the issue happens, the controller is always on the 0.9 version Kafka
broker.
In server.log of other brokers, we can see this kind of error:
[2016-03-23 22:36:02,814] ERROR [ReplicaFetcherThread-0-5], Error for
partition [topic,208] to broker
Hi folks, Rajiv, Jun,
I'd like to bring up this thread again from Rajiv Kurian 3 months ago.
Basically we did the same thing as Rajiv did. I upgraded two machines (out
of 10) from 0.8.2.1 to 0.9. SO after the upgrade, there will be 2 machines
in 0.9 and 8 machines in 0.8.2.1. And initially it all
