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https://issues.apache.org/jira/browse/YARN-2171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14044746#comment-14044746
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Hudson commented on YARN-2171:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #1813 (See 
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1813/])
YARN-2171. Improved CapacityScheduling to not lock on nodemanager-count when 
AMs heartbeat in. Contributed by Jason Lowe. (vinodkv: 
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1605616)
* /hadoop/common/trunk/hadoop-yarn-project/CHANGES.txt
* 
/hadoop/common/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacityScheduler.java
* 
/hadoop/common/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestCapacityScheduler.java


> AMs block on the CapacityScheduler lock during allocate()
> ---------------------------------------------------------
>
>                 Key: YARN-2171
>                 URL: https://issues.apache.org/jira/browse/YARN-2171
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 0.23.10, 2.4.0
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Critical
>             Fix For: 2.5.0
>
>         Attachments: YARN-2171.patch, YARN-2171v2.patch
>
>
> When AMs heartbeat into the RM via the allocate() call they are blocking on 
> the CapacityScheduler lock when trying to get the number of nodes in the 
> cluster via getNumClusterNodes.



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