Yi Liu created HADOOP-11452:
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             Summary: Revisit org.apache.hadoop.fs.FileSystem#rename
                 Key: HADOOP-11452
                 URL: https://issues.apache.org/jira/browse/HADOOP-11452
             Project: Hadoop Common
          Issue Type: Task
          Components: fs
            Reporter: Yi Liu
            Assignee: Yi Liu


Currently in {{FileSystem}}, {{rename}} with _Rename options_ is protected and 
with _deprecated_ annotation. And the default implementation is not atomic.

So this method is not able to be used outside. On the other hand, HDFS has a 
good and atomic implementation. (Also an interesting thing in {{DFSClient}}, 
the _deprecated_ annotations for these two methods are opposite).

It makes sense to make public for {{rename}} with _Rename options_, since it's 
atomic for rename+overwrite, also it saves RPC calls if user desires 
rename+overwrite.



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