mw:Redis gives details about using it with MediaWiki. The use cases for Redis are a bit different from Memcached (because they are similar, not identical). In particular, Session storage and Job queue management are mentioned as use cases. The consensus on Stack Overflow is that Redis is better .
Docs are at https://redis.io/documentation
- Great discussion comparing Redis to Memcached: https://stackoverflow.com/questions/10558465/memcached-vs-redis