https://github.com/symfony/symfony/blob/b47b51187e63e342487f935a2cc60f31db60e73d/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php#L338-L340 Is there a reason the code is using `connect` rather than `memcache` ? I would expect `connect` to be blocking, while with `addServer` the connection will happen only when trying to get/set from memcache