//in both mapred-site.xml and taskcontroller.cfg.
//This change can be done after cluster is brought up as
//Linux task controller will access taskcontroller.cfg
//when a job's task starts.
for ( int i = 0;i < ttClients.size();i++ ) {
TTClient ttClient = (TTClient)ttClients.get(i);
String ttClientHostName = ttClient.getHostName();
try {
RemoteExecution rExec = new SSHRemoteExecution();
rExec.executeCommand(ttClientHostName, userName,
replaceTaskControllerCommand);
} catch (Exception e) { e.printStackTrace(); };