[jira] [Created] (KAFKA-9275) Print assignment and IP address in the log message when consumer leaves/removed from the group

[Badai Aqrandista (Jira)]

Badai Aqrandista created KAFKA-9275:
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             Summary: Print assignment and IP address in the log message when 
consumer leaves/removed from the group
                 Key: KAFKA-9275
                 URL: https://issues.apache.org/jira/browse/KAFKA-9275
             Project: Kafka
          Issue Type: Improvement
            Reporter: Badai Aqrandista


In order to simplify identification of which member is causing rebalance, can 
we add the IP address and the list of topic-partitions assigned to the member 
that leaves/removed from the group?

And especially in the "reason" string for rebalance: 

https://github.com/apache/kafka/blob/2.4/core/src/main/scala/kafka/coordinator/group/GroupCoordinator.scala#L964

https://github.com/apache/kafka/blob/2.4/core/src/main/scala/kafka/coordinator/group/GroupCoordinator.scala#L972

https://github.com/apache/kafka/blob/2.4/core/src/main/scala/kafka/coordinator/group/GroupCoordinator.scala#L1144

https://github.com/apache/kafka/blob/2.4/core/src/main/scala/kafka/coordinator/group/GroupCoordinator.scala#L493


This will allow a much faster investigation when a consumer group is stuck in 
rebalancing state.




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