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Task
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Resolution: Done
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Major
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1.0.1.GA, 1.1.0.GA, 1.1.1.GA, 1.2.0.GA, 1.3.0.GA, 1.4.0.GA, 1.4.1.GA, 1.5.0.GA
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None
During rolling restart of a Kafka cluster transactional producers can (but don't always) experience `TimeoutException` on calls to `producer.commitTransaction()`. This is due to broken locking as described in https://issues.apache.org/jira/browse/KAFKA-9777. This has been fixed in Kafka 2.6.