Rajini Sivaram created KAFKA-6096:
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             Summary: Add concurrent tests to exercise all paths in 
group/transaction managers
                 Key: KAFKA-6096
                 URL: https://issues.apache.org/jira/browse/KAFKA-6096
             Project: Kafka
          Issue Type: Test
          Components: core
            Reporter: Rajini Sivaram
             Fix For: 1.1.0


We don't have enough tests to test locking/deadlocks in GroupMetadataManager 
and TransactionManager. Since we have had a lot of deadlocks (KAFKA-5970, 
KAFKA-6042 etc.) which were not detected during testing, we should add more 
mock tests with concurrency to verify the locking.



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