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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3126) mr job stuck because reducers using all slots and mapper isn't scheduled
Date Tue, 11 Oct 2011 18:47:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125278#comment-13125278
] 

Hudson commented on MAPREDUCE-3126:
-----------------------------------

Integrated in Hadoop-Mapreduce-trunk-Commit #1077 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/1077/])
    MAPREDUCE-3126. Fixed a corner case in CapacityScheduler where headroom wasn't updated
on changes to cluster size.

acmurthy : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1182000
Files : 
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacitySchedulerConfiguration.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/LeafQueue.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestApplicationLimits.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestLeafQueue.java

                
> 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
>            Assignee: Arun C Murthy
>            Priority: Blocker
>             Fix For: 0.23.0
>
>         Attachments: MAPREDUCE-3126.patch
>
>
> 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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