Guozhang Wang created KAFKA-13765:
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Summary: Describe-consumer admin should not return unstable
membership information
Key: KAFKA-13765
URL: https://issues.apache.org/jira/browse/KAFKA-13765
Project: Kafka
Issue Type: Bug
Components: admin
Reporter: Guozhang Wang
When a consumer group is in the “prepare-rebalance” phase, it's unclear if all
its currently registered members would still be re-joining in the new
generation or not, in this case, if we simply return the current members map to
the describe-consumer request it may be misleading as users would be getting
spurious results that may contain those dropping or even zombie consumers.
So I think during the prepare-rebalance phase, we should either only return
members who's join-group requests have already been received, OR we simply
return the response with no members and indicate that via prepare-rebalance
state the membership info is unstable and hence won't be returned.
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