HDFS needs to support new rename introduced for FileContext
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                 Key: HDFS-654
                 URL: https://issues.apache.org/jira/browse/HDFS-654
             Project: Hadoop HDFS
          Issue Type: New Feature
    Affects Versions: 0.21.0
            Reporter: Suresh Srinivas
            Assignee: Suresh Srinivas


New rename functionality with different semantics to overwrite the existing destination was introduced for use in FileContext. Currently the default implementation in FileSystem is not atomic. This change implements atomic rename operation for use by FileContext.

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