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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-161) Tasks are not scheduled even though task trackers have extra slots
Date Mon, 21 Jul 2014 20:30:40 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-161?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Allen Wittenauer resolved MAPREDUCE-161.
----------------------------------------

    Resolution: Incomplete

Closing this as stale.

> Tasks are not scheduled even though task trackers have extra slots
> ------------------------------------------------------------------
>
>                 Key: MAPREDUCE-161
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-161
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Runping Qi
>
> I ran a job with 51 reduce tasks on a cluster with 13 task trackers running Hadoop 0.19.
Each task tracker has 5 reduce slots.
> Initially, each task tracker accepted 4 reduce tasks as expected. However,  3 task trackers
were put into blacklist because many tasks failed on them.
> However, those failed tasks stayed in pending state, not being scheduled to other task
trackers, even though each of the other healthy tracker has one free slot.



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