if (!isInitialized) {
EmbeddedCassandraServerHelper.startEmbeddedCassandra();
// create structure and load data
String clusterName = "Tatami cluster";
String host = "localhost:9171";
DataLoader dataLoader = new DataLoader(clusterName, host);
dataLoader.load(new ClassPathJsonDataSet("dataset/dataset.json"));
final ImmutableSettings.Builder builder = ImmutableSettings.settingsBuilder();
builder.put("cluster.name", clusterName);
final Node node = NodeBuilder.nodeBuilder().settings(builder.build()).local(true).node();