[jerf]

I assume Instagram was a serious user of Redis. If you can switch from Redis to Cassandra in a matter of days, even after presumably years of Redis-usage being ground in your code base (because no matter how much you try to abstract out your fundamental data store, it always comes poking out in your architecture), it's probably not useful for Redis to try to out-Cassandra Cassandra. Let Redis be the best Redis it can be, and let Cassandra be the best Cassandra it can be.

[rbranson]

We are still a very serious user of Redis, and I agree with this. Redis works well as a persisted networked heap, which very different from a database. IMHO Redis would have to trade off a lot of it's value to become a "real database."