Wangda Tan created YARN-4231:

             Summary: Node Label should support pluggable storage
                 Key: YARN-4231
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Wangda Tan
            Assignee: Wangda Tan

We need to support pluggable storage for node label. Currently it requires file 
system supports append. Some filesystem doesn't support append, for example, 
Azure FileSystem. We'd better make storage implementation pluggable so 
different filesystem can choose their best approach to implement node label 

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