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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