@Override
  public void saveConfigGroupUpdate(ConfigGroupRequest configGroupRequest, ConfigGroupResponse configGroupResponse) {
    configGroupUpdateCache.put(configGroupRequest, configGroupResponse);
  }
Save cluster update results to retrieve later
@param clusterRequest   cluster request info
@param clusterResponse  cluster response info
ambari-server/src/main/java/org/apache/ambari/server/controller/AmbariManagementControllerImpl.java