Guozhang Wang created KAFKA-2018:
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             Summary: Add metadata to consumer registry info
                 Key: KAFKA-2018
                 URL: https://issues.apache.org/jira/browse/KAFKA-2018
             Project: Kafka
          Issue Type: Sub-task
            Reporter: Guozhang Wang
            Assignee: Guozhang Wang
             Fix For: 0.9.0


While working on the new consumer and the coordinator, I found there are some 
consumer metadata info that should better be kept track of. For example, in the 
new consumer the consumer id is assigned by the coordinator, which is just the 
group name + index, and we have lost useful information such as host name in 
the consumer id. Adding a metadata in the consumer registry info as we did in 
the consumer commit message would be very useful in this case.

Since join group request protocol has not been exposed as the new consumer 
release, I think we can just change its format without bumping up request 
version. I am also wondering if a KIP is required for this change.



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