balancer.start(callback);
callback.get(30, TimeUnit.SECONDS);
Directory dir = balancer.getDirectory();
ZKConnection conn = new ZKConnection("localhost:" + PORT, 30000);
conn.start();
ZooKeeperPermanentStore<ClusterProperties> store =
new ZooKeeperPermanentStore<ClusterProperties>(conn, new ClusterPropertiesJsonSerializer(),
ZKFSUtil.clusterPath(BASE_PATH));
callback = new FutureCallback<None>();