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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-335) Fair scheduler doesn't check whether rack needs containers before assigning to node
Date Tue, 15 Jan 2013 16:26:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13553955#comment-13553955
] 

Hudson commented on YARN-335:
-----------------------------

Integrated in Hadoop-trunk-Commit #3238 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/3238/])
    YARN-335. Fair scheduler doesn't check whether rack needs containers before assigning
to node. Contributed by Sandy Ryza. (Revision 1433484)

     Result = SUCCESS
tomwhite : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1433484
Files : 
* /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/fair/AppSchedulable.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/fair/TestFairScheduler.java

                
> Fair scheduler doesn't check whether rack needs containers before assigning to node
> -----------------------------------------------------------------------------------
>
>                 Key: YARN-335
>                 URL: https://issues.apache.org/jira/browse/YARN-335
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: scheduler
>    Affects Versions: 2.0.2-alpha
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>         Attachments: YARN-335.patch
>
>
> If an application has an outstanding request on a node, the fair scheduler may try to
place a container on that node without checking whether that node's rack needs any containers.
 If the rack doesn't need any containers, none should be scheduled on the node.
> This can cause an NPE in the fair scheduler. 

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