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

["Vahid Hashemian (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-5016?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vahid Hashemian resolved KAFKA-5016.
------------------------------------
    Resolution: Not A Bug

> 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: 0.10.1.0, 0.10.2.0
>            Reporter: Domenico Di Giulio
>            Assignee: Vahid Hashemian
>         Attachments: Kafka 0.10.2.0 Issue (TRACE) - Server + Client.txt, Kafka 0.10.2.0 Issue (TRACE).txt, KAFKA_5016.java
>
>
> 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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