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https://issues.apache.org/jira/browse/MAPREDUCE-4437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13415561#comment-13415561
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Hudson commented on MAPREDUCE-4437:
-----------------------------------

Integrated in Hadoop-Mapreduce-trunk-Commit #2503 (See 
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/2503/])
    MAPREDUCE-4437. Race in MR ApplicationMaster can cause reducers to never be 
scheduled (Jason Lowe via bobby) (Revision 1362209)

     Result = FAILURE
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1362209
Files : 
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* 
/hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/rm/RMContainerAllocator.java
* 
/hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/TestRMContainerAllocator.java

                
> Race in MR ApplicationMaster can cause reducers to never be scheduled
> ---------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4437
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4437
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: applicationmaster, mrv2
>    Affects Versions: 0.23.3, 2.1.0-alpha
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Critical
>             Fix For: 0.23.3, 3.0.0, 2.2.0-alpha
>
>         Attachments: MAPREDUCE-4437.patch
>
>
> If the MR AM is notified of container completion by the RM before the AM 
> receives notification of the container cleanup from the NM then it can fail 
> to schedule reducers indefinitely.  Logs showing the issue to follow.

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