Jun Rao created KAFKA-2411:
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             Summary: remove usage of BlockingChannel in the broker
                 Key: KAFKA-2411
                 URL: https://issues.apache.org/jira/browse/KAFKA-2411
             Project: Kafka
          Issue Type: Sub-task
            Reporter: Jun Rao


In KAFKA-1690, we are adding the SSL support at Selector. However, there are 
still a few places where we use BlockingChannel for inter-broker communication. 
We need to replace those usage with Selector/NetworkClient to enable 
inter-broker communication over SSL. Specially, BlockingChannel is currently 
used in the following places.
1. ControllerChannelManager: for the controller to propagate metadata to the 
brokers.
2. KafkaServer: for the broker to send controlled shutdown request to the 
controller.
3. AbstractFetcherThread: for the follower to fetch data from the leader 
(through SimpleConsumer).



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