zhihai xu created YARN-2756:
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             Summary: use static variable (Resources.none()) for not-running 
Node.resource in CommonNodeLabelsManager to save memory.
                 Key: YARN-2756
                 URL: https://issues.apache.org/jira/browse/YARN-2756
             Project: Hadoop YARN
          Issue Type: Improvement
            Reporter: zhihai xu
            Assignee: zhihai xu
            Priority: Minor


use static variable (Resources.none()) for not-running Node.resource in 
CommonNodeLabelsManager to save memory. When a Node is not activated, the 
resource is never used, When a Node is activated, a new resource will be 
assigned to it in RMNodeLabelsManager#activateNode (nm.resource = resource;) So 
it would be better to use static variable Resources.none() instead of 
allocating a new variable(Resource.newInstance(0, 0)) for each node 
deactivation.



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