First, add the following to mapred-site.xml :
  <value>-Xmx512m -Xdebug -Xrunjdwp:transport=dt_socket,address127.0.0.1:9987,suspend=y</value>
Now. add a "Remote Java Application" run configuration in eclipse.
The "Conection Type" should be Standard (Socket Listen), and the port
should be 9987.

Happy debugging!

On Sat, Aug 25, 2012 at 10:48 AM, Manoj Babu <[EMAIL PROTECTED]> wrote:
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