A couple of weeks ago I was talking to one of my oldest database colleagues (and a very dear friend of mine). We were chatting about how key/value stores and databases are evolving, and how they always seem to be revolving around in-memory solutions and cache. The main rant was how this kind of thing doesn’t scale well, while being expensive and complicated to maintain.

My friend’s background story was that they are running an application that uses a user profile with almost 700 million profiles (their total size was around 2TB, with a replication factor of 2). Since the…

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