public final boolean updateJobDurationInfo(final JobDurationInfoClass info) {
    // System.out.println("Adding job " + info.getJobID() + " with "
    // + info.getTasks(TaskType.MAP).size() + " map tasks");

    TaskType type = info.getType();

    Set<JobDurationInfoClass> jdis =
        (type == TaskType.MAP) ? this.mapJobDurationInfos : this.reduceJobDurationInfos;

    if (!jdis.contains(info)) return false;

    jdis.remove(info);
    boolean res = jdis.add(info);

    if (!res) return res;

    List<TaskDurationInfoClass> slots = this.cluster.getSlots(type);
    for (int i = 0; i < slots.size(); i++) {
      TaskDurationInfoClass slot = slots.get(i);
      if (slot != null && slot.getTaskID().getJobID().equals(info.getJobID())) {
        this.cluster.freeSlot(type, i);
      }
    }

    this.schedule(type);

    return res;
  }
  public final boolean addJobDurationInfo(final JobDurationInfoClass info) {
    // System.out.println("Adding job " + info.getJobID() + " with "
    // + info.getTasks(TaskType.MAP).size() + " map tasks");

    TaskType type = info.getType();
    boolean res =
        (type == TaskType.MAP)
            ? this.mapJobDurationInfos.add(info)
            : this.reduceJobDurationInfos.add(info);
    if (!res) return res; // nothing changed

    this.schedule(type);

    return res;
  }