public void doYarnResourceManagerHAUpdate() {
    Map<String, Map<String, PropertyUpdater>> highAvailabilityUpdaters = createMapOfYarnResourceManagerHAUpdaters();

    // perform a single host update on these dynamically generated property names
    if (highAvailabilityUpdaters.get("yarn-site").size() > 0) {
      doSingleHostExportUpdate(highAvailabilityUpdaters, clusterTopology.getConfiguration());
    }
  }
Perform export update processing for HA configuration for Yarn ResourceManagers.  The HA ResourceManager
property names are based on the ResourceManager names defined when HA is enabled via the Ambari UI, so this method
dynamically determines the property names, and registers PropertyUpdaters to handle the masking of
host names in these configuration items.
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/BlueprintConfigurationProcessor.java