title: Hadoop: How can i merge reducer outputs to a single file?
body: <p>I know that "getmerge" command in shell can do this work.</p>
  
  <p>But what should I do if I want to merge these outputs after the job by HDFS API for java？ </p>
  
  <p>What i actually want is a single merged file on HDFS.</p>
  
  <p>The only thing i can think of is to start an additional job after that. </p>
  
  <p>thanks!</p>