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Posted to jira@kafka.apache.org by "Jason Gustafson (JIRA)" <ji...@apache.org> on 2018/02/26 21:14:00 UTC

[jira] [Created] (KAFKA-6593) Coordinator disconnect in heartbeat thread can cause commitSync to block indefinitely

Jason Gustafson created KAFKA-6593:
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             Summary: Coordinator disconnect in heartbeat thread can cause commitSync to block indefinitely
                 Key: KAFKA-6593
                 URL: https://issues.apache.org/jira/browse/KAFKA-6593
             Project: Kafka
          Issue Type: Bug
          Components: consumer
    Affects Versions: 0.11.0.2, 1.0.0
            Reporter: Jason Gustafson
            Assignee: Jason Gustafson


If a coordinator disconnect is observed in the heartbeat thread, it can cause a pending offset commit to be cancelled just before the foreground thread begins waiting on its response in poll(). Since the poll timeout is Long.MAX_VALUE, this will cause the consumer to effectively hang until some other network event causes the poll() to return. We try to protect this case with a poll condition on the future, but this isn't bulletproof since the future can be completed outside of the lock.



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