title: jobtracker and tasktracker not opening
body: <p>i have successfully installed ubuntu 12.04 and hadoop 2.3.0.</p>
  
  <p>after entering the jps command i find the output as below</p>
  
  <pre><code>4135 jps
  2582 SeconadaryNameNode
  3143 NodeManager
  2394 Namenode
  2391 Datanode
  3021 ResourceManager
  </code></pre>
  
  <p>why it is not showing the jobtracker and tasktracker.
  i tried start-mapred.sh but it shows command not found.(i searched the hadoop directory no such file found so i think the newer version i.e 2.0.3 has deprecated it and must be having some other way of starting jobtracker and tasktracker)</p>
  
  <p>localhost:50070 working absolutely fine
  but localhost:50030 and localhost:50060 shows unable to connect.</p>
  
  <p>so anybody can help me out in this?</p>