@Test
 public void testProcessInfo() throws Exception {
   LOG.info("Process info of JobTracker is : " + cluster.getJTClient().getProcessInfo());
   Assert.assertNotNull(cluster.getJTClient().getProcessInfo());
   Collection<TTClient> tts = cluster.getTTClients();
   for (TTClient tt : tts) {
     LOG.info("Process info of TaskTracker is : " + tt.getProcessInfo());
     Assert.assertNotNull(tt.getProcessInfo());
   }
 }