New improved FileSystem interface for those implementing new files systems.
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                 Key: HADOOP-6223
                 URL: https://issues.apache.org/jira/browse/HADOOP-6223
             Project: Hadoop Common
          Issue Type: Sub-task
            Reporter: Sanjay Radia


The FileContext API (HADOOP-4952) provides an improved interface for the 
application writer.
This lets us simplify the FileSystem API since it will no longer need to deal 
with notions of default filesystem [ / ],  wd, and config
defaults for blocksize, replication factor etc. Further it will not need the 
many overloaded methods for create() and open() since
the FileContext API provides that convenience.
The FileSystem API can be simplified and can now be restricted to those 
implementing new file systems.


This jira proposes that we create new file system API,  and deprecate 
FileSystem API after a few releases.

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