Wangda Tan created YARN-2786:

             Summary: Create yarn node-labels CLI to enable list node labels 
collection and node labels mapping
                 Key: YARN-2786
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Wangda Tan
            Assignee: Wangda Tan

With YARN-2778, we can list node labels on existing RM nodes. But it is not 
enough, we should be able to: 
1) list node labels collection 
2) list node-to-label mappings even if the node hasn't registered to RM.

The command should start with "yarn node-labels ..."

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