public boolean isPropertySet(String configType, String propertyName) {
    return properties.containsKey(configType) && properties.get(configType).containsKey(propertyName) ||
      parentConfiguration != null && parentConfiguration.isPropertySet(configType, propertyName);
  }
General convenience method to determine if a given property has been set in the cluster configuration

@param configType the config type to check
@param propertyName the property name to check
@return true if the named property has been set
        false if the named property has not been set
ambari-server/src/main/java/org/apache/ambari/server/topology/Configuration.java