[jira] [Created] (KAFKA-5016) Consumer hang in poll method while rebalancing is in progress

["Domenico Di Giulio (JIRA)" <ji...@apache.org>]

Domenico Di Giulio created KAFKA-5016:
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             Summary: Consumer hang in poll method while rebalancing is in progress
                 Key: KAFKA-5016
                 URL: https://issues.apache.org/jira/browse/KAFKA-5016
             Project: Kafka
          Issue Type: Bug
          Components: core
    Affects Versions: 0.10.2.0, 0.10.1.0
            Reporter: Domenico Di Giulio
         Attachments: Kafka 0.10.2.0 Issue (TRACE).txt

After moving to Kafka 0.10.2.0, it looks like I'm experiencing a hang in the rebalancing code. 

This is a test case, not (still) production code. It does the following with a single-partition topic and two consumers in the same group:

1) a topic with one partition is forced to be created (auto-created)
2) a producer is used to write 10 messages
3) the first consumer reads all the messages and commits
4) the second consumer attempts a poll() and hangs indefinitely

The same issue can't be found with 0.10.0.0.

See the attached logs at TRACE level. Look for "SERVER HANGS" to see where the hang is found: when this happens, the client keeps failing any hearbeat attempt, as the rebalancing is in progress, and the poll method hangs indefinitely.



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