Some convenient methods in the FileSystem API should be final.
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                 Key: HADOOP-4328
                 URL: https://issues.apache.org/jira/browse/HADOOP-4328
             Project: Hadoop Core
          Issue Type: Improvement
          Components: fs
            Reporter: Tsz Wo (Nicholas), SZE


In FileSystem, some methods are overloaded with different parameter list.  We 
should mark the convenient methods final.

For example, the create(...) method has 10 different signatures.  Subclasses of 
FileSystem should only override the one with the most number or parameters but 
not the others.  We should mark all the other 9 create(...) final.

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