protected Object doExecute() throws Exception {
Node node = clusterManager.findNodeById(nodeId);
System.out.println("Pinging node :" + node.getId());
for (int i = 1; i <= iterations; i++) {
Long start = System.currentTimeMillis();
Ping ping = new Ping(clusterManager.generateId());
ping.setDestination(new HashSet(Arrays.asList(node)));
executionContext.execute(ping);
Long stop = System.currentTimeMillis();
Long delay = stop - start;
System.out.println(String.format("PING %s %s %sms", i, node.getId(), delay));
Thread.sleep(interval);