if (_gZkClient.exists(path)) {
_gZkClient.deleteRecursive(path);
}
ZKHelixDataAccessor accessor =
new ZKHelixDataAccessor(clusterName, new ZkBaseDataAccessor(_gZkClient));
Builder keyBuilder = accessor.keyBuilder();
TestHelper.setupEmptyCluster(_gZkClient, clusterName);
final String controllerName = "controller_0";