// Start instance status topic subscriber
if(log.isDebugEnabled()) {
log.debug("Starting instance status topic subscriber...");
}
TopicSubscriber subscriber = new TopicSubscriber(Constants.INSTANCE_STATUS_TOPIC);
subscriber.setMessageListener(new InstanceStatusListener());
Thread tsubscriber = new Thread(subscriber);
tsubscriber.start();
//initializing the topology event subscriber
/*TopicSubscriber topologyTopicSubscriber = new TopicSubscriber(Constants.TOPOLOGY_TOPIC);