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https://issues.apache.org/jira/browse/MAPREDUCE-3126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120163#comment-13120163
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Thomas Graves commented on MAPREDUCE-3126:
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Sorry, haven't got back to this but have the logs saved off, will look later
today.
> mr job stuck because reducers using all slots and mapper isn't scheduled
> ------------------------------------------------------------------------
>
> 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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