@Override
    public String toString() {
      String s = "";
      for (TaskWrapper t : tasks) {
        s += component + "/" + t.getTasks() + " ";
      }

      return s;
    }
Represents all the tasks that need to be run for a host
ambari-server/src/main/java/org/apache/ambari/server/stack/upgrade/ColocatedGrouping.java