code: @SuppressWarnings("deprecation")
    public void killJob(JobID jobId, Map<String, InetAddress> allTrackers) {
      for (Map.Entry<String, InetAddress> entry : allTrackers.entrySet()) {
        String trackerName = entry.getKey();
        InetAddress addr = entry.getValue();
        String description = "KillJobAction " + jobId;
        ActionToSend action = new ActionToSend(trackerName, addr,
            new KillJobAction(jobId), description);
        allWorkQueues.enqueueAction(action);
        LOG.info("Queueing "  + description + " to worker " +
          trackerName + "(" + addr.host + ":" + addr.port + ")");
      }
    }
docs: Enqueue an action to kill the job.
  @param jobId The job identifier.
  @param allTrackers All trackers to send the kill to.