Mickael Maison created KAFKA-14095:
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             Summary: Improve handling of sync offset failures in MirrorMaker
                 Key: KAFKA-14095
                 URL: https://issues.apache.org/jira/browse/KAFKA-14095
             Project: Kafka
          Issue Type: Improvement
          Components: mirrormaker
            Reporter: Mickael Maison
            Assignee: Mickael Maison


MirrorMaker can automatically sync offsets when sync.group.offsets.enabled is 
set to true. However that only works if the consumer groups are not used in the 
target cluster otherwise committing offsets fails with UNKNOWN_MEMBER_ID. 

Currently we treat this case as an error in the admin client so it emits an 
ERROR level log line. This is misleading as it's not an unexpected error and we 
should treat it the same way as other group level error codes.

In addition we should check the result of the alterConsumerGroupOffsets call in 
MirrorMaker and provide an helpful message in case of UNKNOWN_MEMBER_ID errors.



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