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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