for (int i = 0; i < 2; i++) {
final int groupNum = i;
final String group = "twin" + groupNum;
groups.add(group);
ListenableFuture<NodeMetadata> future = userExecutor.submit(new Callable<NodeMetadata>() {
public NodeMetadata call() throws Exception {
NodeMetadata node = getOnlyElement(client.createNodesInGroup(group, 1, inboundPorts(22, 8080)
.blockOnPort(22, 300 + groupNum)));
getAnonymousLogger().info("Started node " + node.getId());
return node;