[jira] [Created] (KAFKA-8386) Use COORDINATOR_NOT_AVAILABLE to replace UNKNOWN_MEMBER_ID when the group is not available

["Boyang Chen (JIRA)" <ji...@apache.org>]

Boyang Chen created KAFKA-8386:
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             Summary: Use COORDINATOR_NOT_AVAILABLE to replace UNKNOWN_MEMBER_ID when the group is not available
                 Key: KAFKA-8386
                 URL: https://issues.apache.org/jira/browse/KAFKA-8386
             Project: Kafka
          Issue Type: Sub-task
            Reporter: Boyang Chen
            Assignee: Boyang Chen


When the group is dead or unavailable on the coordinator, current approach is to return `UNKNOWN_MEMBER_ID` to let the member reset generation and rejoin. It is not particularly safe for static members in this case, since resetting `member.id` could delay the detection for duplicate instance.id.

Also considering the fact that group unavailability could mostly be caused by migration, it is favorable to trigger a coordinator rediscovery immediately than one more bounce. Thus, we decide to use `COORDINATOR_NOT_AVAILABLE` as top line citizen.



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