title: How to install a Hadoop plugin or patch?
body: <p>Does somebody knows how to install a Hadoop patch like things in <a href="https://issues.apache.org/jira/browse/HDFS-385" rel="nofollow">https://issues.apache.org/jira/browse/HDFS-385</a> ?</p>
  
  <p>I don't know what and how to override the original codes so that the pluggable interface can work.</p>
  
  <p>Could anybody give me a hint?</p>
  
  <p>thanks</p>