Guozhang Wang created KAFKA-6589:
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Summary: Extract Heartbeat thread from Abstract Coordinator for
testability purposes
Key: KAFKA-6589
URL: https://issues.apache.org/jira/browse/KAFKA-6589
Project: Kafka
Issue Type: Improvement
Components: consumer
Reporter: Guozhang Wang
Today we do not have an easy way to instrument the heartbeat thread in our unit
test, e.g. to inject a GC or make it crash etc since it is a private class
inside AbstractCoordinator.
It is better to extract this class out and also enabling AbstractCoordinator to
take a heartbeat-thread interface that can be mocked for test utils.
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