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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