apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/ClusterService.java/ClusterService/saveWithInstanceOfAppNamespaces
class ClusterService:  @Transactional
  public Cluster saveWithInstanceOfAppNamespaces(Cluster entity) {

    Cluster savedCluster = saveWithoutInstanceOfAppNamespaces(entity);

    namespaceService.instanceOfAppNamespaces(savedCluster.getAppId(), savedCluster.getName(),
                                             savedCluster.getDataChangeCreatedBy());

    return savedCluster;
  }