Hacker News Reader

> And since it's not like there's a huge penalty for using Redis

There is compared to shared memory.

If you actually need to scale and don't have an in-memory cache layer over Redis you're likely going to get hurt.

The real solution here is to simply write your code with an appropriate amount of abstractions, and then start with the simplest / cheapest backend that fits your needs. When it comes time to add Redis, or shared memory, or both, only a small amount of your code needs to be adjusted for the new backing store.

Reply on news.ycombinator.com