code: public void launchTask(Task task, String trackerName, InetAddress addr) {
      CoronaSessionInfo info = new CoronaSessionInfo(
        coronaJT.getSessionId(), coronaJT.getJobTrackerAddress(),
        coronaJT.getSecondaryTrackerAddress());
      LaunchTaskAction action = new LaunchTaskAction(task, info);
      String description = "LaunchTaskAction " + action.getTask().getTaskID();
      ActionToSend actionToSend =
          new ActionToSend(trackerName, addr, action, description);
      LOG.info("Queueing " + description +  " to worker " +
        trackerName + "(" + addr.host + ":" + addr.port + ")");
      allWorkQueues.enqueueAction(actionToSend);
    }
docs: Enqueue a launch task action.
  @param task The task to launch.
  @param trackerName The name of the tracker to send the task to.
  @param addr The address of the tracker to send the task to.