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Date: Tue, 4 Oct 2011 14:36:34 +0000 (UTC)
From: "Thomas Graves (Commented) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-3126) mr job stuck because reducers
 using all slots and mapper isn't scheduled
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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 ] 

Thomas Graves commented on MAPREDUCE-3126:
------------------------------------------

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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