title: How to set the number of map tasks in hadoop 0.20?
body: <p>I'm trying to set the number of map tasks to run in hadoop 0.20 environment.</p>
  
  <p>I am using the old api.</p>
  
  <p>Here are the options I've tried so far:</p>
  
  <pre><code>    conf.set("mapred.tasktracker.map.tasks.maximum", "5");
      conf.set("mapred.map.tasks", "10");
      conf.set("mapred.map.tasksperslot", "5");
      conf.set("mapred.tasktracker.map", "5");
      conf.set("mapred.map.parallel.copies", "5");
  </code></pre>
  
  <p>With all of those on, the number of map tasks running parallely remains 2.</p>
  
  <p>What are the proper options to set to get the number of parallely running mappers up to 5?</p>