* - loadMonitor : Name of a class used to fetch server lag and load.
* - readOnlyReason : Reason the master DB is read-only if so [optional]
* - waitTimeout : Maximum time to wait for replicas for consistency [optional]
- * - srvCache : BagOStuff object [optional]
+ * - srvCache : BagOStuff object for server cache [optional]
+ * - memCache : BagOStuff object for cluster memory cache [optional]
* - wanCache : WANObjectCache object [optional]
+ * - hostname : the name of the current server [optional]
* @throws InvalidArgumentException
*/
public function __construct( array $params );