@Override
  public void updateGroups(Set<GroupRequest> requests) throws AmbariException {
    // currently no group updates are supported
  }
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