private void loadConfigGroups() {
    ClusterEntity clusterEntity = getClusterEntity();
    if (!clusterEntity.getConfigGroupEntities().isEmpty()) {
      for (ConfigGroupEntity configGroupEntity : clusterEntity.getConfigGroupEntities()) {
        clusterConfigGroups.put(configGroupEntity.getGroupId(),
            configGroupFactory.createExisting(this, configGroupEntity));
      }
    }
  }
Make sure we load all the service host components.
We need this for live status checks.
ambari-server/src/main/java/org/apache/ambari/server/state/cluster/ClusterImpl.java