[jira] [Created] (KAFKA-9816) Group Coordinator should be stricter about leader returned assignment

["Guozhang Wang (Jira)" <ji...@apache.org>]

Guozhang Wang created KAFKA-9816:
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             Summary: Group Coordinator should be stricter about leader returned assignment 
                 Key: KAFKA-9816
                 URL: https://issues.apache.org/jira/browse/KAFKA-9816
             Project: Kafka
          Issue Type: Improvement
          Components: core
            Reporter: Guozhang Wang


At the moment, broker's group-coordinator does not require leader to provide assignment for all members but will simply default members without assignment with an empty byte buffer. However, since assignment bytes has get two versions now and hence we always have to try de-serialize the version first, an empty assignment could not be interpreted at the client at all.

Therefore, group coordinator should be more strict about the leader#assign function that each member should get non-empty assignment bytes even without assigned partitions.

Once we fixed the bug as discovered in https://issues.apache.org/jira/browse/KAFKA-9801, we should consider making this change since it would be no more compatibility concerns.



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