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https://issues.apache.org/jira/browse/HADOOP-5407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12681422#action_12681422
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Devaraj Das commented on HADOOP-5407:
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This looks like HADOOP-4967 fixed in 0.19.1.
> Sometimes, Reduce tasks hang， State is unassigned
> -------------------------------------------------
>
> Key: HADOOP-5407
> URL: https://issues.apache.org/jira/browse/HADOOP-5407
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.19.0
> Reporter: ZhuGuanyin
>
> Hi, all
> When our cluster runs for a long time, some reduce tasks running on some
> tasktrackers hang. Their states are UNASSIGNED. Then, all reduce tasks on
> these tasktracker will hang.
> We kill the hang reduce task, then the reduce task attempt is re-scheduled to
> this tasktracker, the attempt task continues to hang. We fail it, it goes to
> another tasktracker, it is executed successfully.
> Tasktracker which has hang reduce task will receive new reduce task, but the
> reduce task continue to hang for ever.
> When we reboot the tasktracker machine, reduce task no longer hangs.
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