//service to handle requests to TaskUmbilicalProtocol
taskAttemptListener = createTaskAttemptListener(context,
taskHeartbeatHandler, containerHeartbeatHandler);
addIfService(taskAttemptListener, true);
containers = new AMContainerMap(containerHeartbeatHandler,
taskAttemptListener, context);
addIfService(containers, true);
dispatcher.register(AMContainerEventType.class, containers);
nodes = new AMNodeMap(dispatcher.getEventHandler(), context);