Optimization in org.apache.hadoop.hdfs.server.datanode.FSDataset class.
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                 Key: HDFS-1774
                 URL: https://issues.apache.org/jira/browse/HDFS-1774
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: data-node
            Reporter: Uma Maheswara Rao G
            Assignee: Uma Maheswara Rao G


 Inner class FSDir constructor is doing duplicate iterations over the listed 
files in the passed directory. We can optimize this to single loop and also we 
can avoid isDirectory check which will perform some native invocations. 

  Consider a case: one directory has only one child directory and 10000 files. 

1) First loop will get the number of children directories.

2) if (numChildren > 0) , This condition will satisfy and again it will iterate 
10001 times and also will check isDirectory.


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