Wangda Tan created YARN-2494:

             Summary: [YARN-796] Node label manager API and storage 
                 Key: YARN-2494
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: resourcemanager
            Reporter: Wangda Tan
            Assignee: Wangda Tan

This JIRA includes APIs and storage implementations of node label manager,
NodeLabelManager is an abstract class used to manage labels of nodes in the 
cluster, it has APIs to query/modify
- Nodes according to given label
- Labels according to given hostname
- Add/remove labels
- Set labels of nodes in the cluster
- Persist/recover changes of labels/labels-on-nodes to/from storage

And it has two implementations to store modifications
- Memory based storage: It will not persist changes, so all labels will be lost 
when RM restart
- FileSystem based storage: It will persist/recover to/from FileSystem (like 
HDFS), and all labels and labels-on-nodes will be recovered upon RM restart

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