@Subscribe
  public void onConfigurationChangedEvent(ClusterConfigChangedEvent event) {
    clusterJmxProtocolMap.clear();
  }
Handles {@link ClusterConfigChangedEvent} which means that some caches
should invalidate.

@param event
         the change event.
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/AbstractProviderModule.java