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https://issues.apache.org/jira/browse/MAPREDUCE-175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved MAPREDUCE-175.
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Resolution: Incomplete
Closing this as either stale or already fixed or whatever.
> Sometimes, Reduce tasks hang， State is unassigned
> -------------------------------------------------
>
> Key: MAPREDUCE-175
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-175
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> 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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