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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