private Cluster getCluster() throws AmbariException {
    String clusterName = ambariContext.getClusterName(clusterTopology.getClusterId());
    return AmbariContext.getController().getClusters().getCluster(clusterName);
  }
Create a map of services and the relevant components that are specified in the Blueprint

@param blueprint the blueprint
@return a map of service names to component names
ambari-server/src/main/java/org/apache/ambari/server/topology/ClusterConfigurationRequest.java