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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-335) Fair scheduler doesn't check whether rack needs containers before assigning to node
Date Fri, 11 Jan 2013 20:02:11 GMT
Sandy Ryza created YARN-335:
-------------------------------

             Summary: 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
    Affects Versions: 2.0.2-alpha
            Reporter: Sandy Ryza
            Assignee: Sandy Ryza


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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