Wangda Tan created YARN-3687:

             Summary: We should be able to remove node-label if there's no 
queue can use it.
                 Key: YARN-3687
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Wangda Tan
            Assignee: Wangda Tan

Currently, we cannot remove node label from the cluster if there's no queue 
configure it, but actually we should be able to remove it if capacity on the 
node label in root queue is 0. This can avoid painful when user wants to 
reconfigure node label.

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