public void saveClusterUpdate(ClusterRequest clusterRequest, ClusterResponse clusterResponse) {
    clusterUpdateCache.put(clusterRequest, clusterResponse);
  }
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