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From "Vahid Hashemian (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-5016) Consumer hang in poll method while rebalancing is in progress
Date Wed, 26 Apr 2017 16:00:07 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-5016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15985043#comment-15985043
] 

Vahid Hashemian commented on KAFKA-5016:
----------------------------------------

[~domenico74] Thanks for confirming. Can we close the JIRA then?

> 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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