Wangda Tan created YARN-4405:

             Summary: Support node label store in non-appendable file system
                 Key: YARN-4405
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Wangda Tan
            Assignee: Wangda Tan

Existing node label file system store implementation uses append to write edit 
logs. However, some file system doesn't support append, we need add an 
implementation to support such non-appendable file systems as well. 

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