title: how to attach debugger to remote Hadoop instance
body: <p>I am not looking for these so-called "<a href="http://wiki.apache.org/hadoop/HowToDebugMapReducePrograms" rel="nofollow noreferrer">debugging</a>" solutions which rely on <a href="https://stackoverflow.com/questions/12695991/how-can-i-debug-hadoop-map-reduce">println</a>.  I mean to attach a <em>real</em> debugger to a running Hadoop instance, and debugging it from a different machine.</p>
  
  <p>Is this possible? How? jdb?</p>