@Override
  public RequestStatus createResources(Request request) throws SystemException,
          UnsupportedPropertyException, ResourceAlreadyExistsException,
          NoSuchParentResourceException {
    Iterator<Map<String,Object>> iterator = request.getProperties().iterator();
    String hostName;
    final String desiredRepoVersion;
    String stackName;
    String stackVersion;
    if (request.getProperties().size() > 1) {
      throw new UnsupportedOperationException("Multiple requests cannot be executed at the same time.");
    }

    Map<String, Object> propertyMap  = iterator.next();

    Set<String> requiredProperties = Sets.newHashSet(
            HOST_STACK_VERSION_HOST_NAME_PROPERTY_ID,
            HOST_STACK_VERSION_REPO_VERSION_PROPERTY_ID,
            HOST_STACK_VERSION_STACK_PROPERTY_ID,
            HOST_STACK_VERSION_VERSION_PROPERTY_ID);

    for (String requiredProperty : requiredProperties) {
      Validate.isTrue(propertyMap.containsKey(requiredProperty),
              String.format("The required property %s is not defined", requiredProperty));
    }

    String clName = (String) propertyMap.get (HOST_STACK_VERSION_CLUSTER_NAME_PROPERTY_ID);
    hostName = (String) propertyMap.get(HOST_STACK_VERSION_HOST_NAME_PROPERTY_ID);
    desiredRepoVersion = (String) propertyMap.get(HOST_STACK_VERSION_REPO_VERSION_PROPERTY_ID);
    stackName = (String) propertyMap.get(HOST_STACK_VERSION_STACK_PROPERTY_ID);
    stackVersion = (String) propertyMap.get(HOST_STACK_VERSION_VERSION_PROPERTY_ID);

    boolean forceInstallOnNonMemberHost = false;
    Set<Map<String, String>> componentNames = null;
    String forceInstallOnNonMemberHostString = (String) propertyMap.get
      (HOST_STACK_VERSION_FORCE_INSTALL_ON_NON_MEMBER_HOST_PROPERTY_ID);

    if (BooleanUtils.toBoolean(forceInstallOnNonMemberHostString)) {
      forceInstallOnNonMemberHost = true;
      componentNames = (Set<Map<String, String>>) propertyMap.get(HOST_STACK_VERSION_COMPONENT_NAMES_PROPERTY_ID);
      if (componentNames == null) {
        throw new IllegalArgumentException("In case " + HOST_STACK_VERSION_FORCE_INSTALL_ON_NON_MEMBER_HOST_PROPERTY_ID + " is set to true, the list of " +
          "components should be specified in request.");
      }
    }

    RequestStageContainer req = createInstallPackagesRequest(hostName, desiredRepoVersion, stackName, stackVersion,
      clName, forceInstallOnNonMemberHost, componentNames);
    return getRequestStatus(req.getRequestStatusResponse());
  }
Adds requested entities to resources
@param resources a list of resources to add to
@param requestedEntities requested entities
@param requestedIds
@param clusterName name of cluster or null if no any
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/HostStackVersionResourceProvider.java