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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-175) Sometimes, Reduce tasks hang, State is unassigned
Date Mon, 21 Jul 2014 21:30:40 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Allen Wittenauer resolved MAPREDUCE-175.
----------------------------------------

    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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