Jiankang Liu created KAFKA-2282:
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             Summary: ConsumerConnector enhance
                 Key: KAFKA-2282
                 URL: https://issues.apache.org/jira/browse/KAFKA-2282
             Project: Kafka
          Issue Type: Improvement
          Components: consumer
            Reporter: Jiankang Liu
            Assignee: Neha Narkhede


1. As a developer, I want to manually handle rebalance situation, such as 
commit offset to avoid consume duplicate message; thus export the 
setConsumerRebalanceListener interface in java api.

2. It will throw a ClassCastException to just simply use asInstanceOf to cast 
java.util.map to scala immutable.map; it'd better use JavaConversions, not use 
JavaConverters to keep code style syched and compatible for scala under 2.8 
version.



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