Another benefit in-memory cache vs remote key-value store is the reliability. Redis/memcached servers are super reliable, but at scale, you'll run into non-tri

Another benefit in-memory cache vs remote key-value store is the reliability. Redis/memcached servers are super reliable, but at scale, you'll run into non-trivial amount of failures when communicating to those servers, even a sub-second blip in network connections could result in hundreds of failures. Now you have to deal with retry, ensure your application logic is failure tolerant, worry about timeout, consider impact of temporary delays in redis to your application server due to skyrocketing threads waiting for results and all that fun stuff.