[jira] [Created] (MAPREDUCE-3126) mr job stuck because reducers using all slots and mapper isn't scheduled

["Thomas Graves (Created) (JIRA)" <ji...@apache.org>]

mr job stuck because reducers using all slots and mapper isn't scheduled
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                 Key: MAPREDUCE-3126
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3126
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2
    Affects Versions: 0.23.0
            Reporter: Thomas Graves
            Priority: Blocker
             Fix For: 0.23.0


The command in MAPREDUCE-3124 run and this job got hung with 1 Map task waiting for resources and 7 Reducers running (2 waiting).  The mapper got scheduler, then AM scheduled the reducers, the map task failed and tried to start a new attempt but reducers were using all the slots.   

I will try to add some more info from the logs.

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