File locking memcache with APCu

Just updated to 27.0.1 and got the following warning:

The database is used for transactional file locking. To enhance performance, please configure memcache, if available. See the documentation :arrow_upper_right: for more information.

When I read up on locking, it says that you must use it with Redis. We’re currently using APCu. Is this not supported with this warning?

No you need redis. Then the locking transactions are handled by redis and not your normal database. Redis is a specific type of database that uses less resources for the locking than your usual database.