Daryn Sharp created HDFS-12143:
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             Summary: Improve performance of getting and removing inode features
                 Key: HDFS-12143
                 URL: https://issues.apache.org/jira/browse/HDFS-12143
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: namenode
    Affects Versions: 2.8.0
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp


Getting a feature uses an iterator which is less performant than an indexed for 
loop.  Feature lookups are becoming more prolific so cycles count.

Removing a feature requires building a string for up to 3 precondition checks.  
The worst case of 3 is the penalty for a successful removal.



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