INode refactoring
-----------------

                 Key: HADOOP-1743
                 URL: https://issues.apache.org/jira/browse/HADOOP-1743
             Project: Hadoop
          Issue Type: Improvement
          Components: dfs
    Affects Versions: 0.14.0
            Reporter: Konstantin Shvachko
            Assignee: Konstantin Shvachko
             Fix For: 0.15.0


This is one of the patches related to name-node memory optimization HADOOP-1687.
It moves INode into a separate (base) class with two separate derived classes 
for files and directories.
I also eliminated unnecessary recursions in a couple of places.
And made preparation for further steps outlined in HADOOP-1687.

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