Sandy Ryza created YARN-752:

             Summary: Throw exception if AMRMClient.ContainerRequest is given 
invalid locations
                 Key: YARN-752
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: api, applications
    Affects Versions: 2.0.4-alpha
            Reporter: Sandy Ryza
            Assignee: Sandy Ryza

A ContainerRequest that includes node-level requests must also include matching 
rack-level requests for the racks that those nodes are on.  At the very least, 
an exception should be thrown if one is constructed with a non-empty set of 
nodes but an empty set of racks.

If possible, it would also be nice to validate that the given nodes are on the 
racks that are given.  Although if that is possible, then it might be even 
better to just automatically fill in racks for nodes.

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