[Hadoop Wiki] Update of "HadoopDfsReadWriteExample" by SteveLoughran

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The following page has been changed by SteveLoughran:
http://wiki.apache.org/hadoop/HadoopDfsReadWriteExample

The comment on the change is:
move to HDFS

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  ~+Simple Example to Read and Write files from Hadoop DFS+~
  
- Reading from and writing to Hadoop DFS is no different from how it is done with other file systems. The example attachment:HadoopDFSFileReadWrite.java reads a file from DFS and writes it to another file on DFS (copy command). 
+ Reading from and writing to Hadoop DFS is no different from how it is done with other file systems. The example attachment:HadoopDFSFileReadWrite.java reads a file from HDFS and writes it to another file on HDFS (copy command). 
  
  Hadoop [http://hadoop.apache.org/core/api/org/apache/hadoop/fs/FileSystem.html FileSystem] API describes the methods available to user. Let us walk through the code to understand how it is done.