@Override
  public Set<ServiceConfigVersionResponse> getServiceConfigVersions(Set<ServiceConfigVersionRequest> requests)
      throws AmbariException {
    Set<ServiceConfigVersionResponse> responses = new LinkedHashSet<>();

    for (ServiceConfigVersionRequest request : requests) {
      responses.addAll(getServiceConfigVersions(request));
    }

    return responses;
  }
Get a request response for the given request ids.  Note that this method
fully populates a request resource including the set of task sub-resources
in the request response.
ambari-server/src/main/java/org/apache/ambari/server/controller/AmbariManagementControllerImpl.java