[Jach]

These big incidents involving 'big cache' are fun to read about. Years ago I had to deal with a bunch of cache issues over a short time, but they were all minor incidents with minor uses of cache (simple memoization, storing stuff in maps on attributes of java singletons, browser local storage). Still, I made a checklist of questions to ask thenceforth on any proposal or implementation of a cache in a doc or code review. A bunch of them are just focused on actually paying attention to what your keys are made of and how invalidation works (or if you even can invalidate, or if it's even needed). I think for 'big cache' questions I should just refer to this blog post and ask "what's the risk of these issues?"