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There's two hard problems in computer science: name spacing and caching.

This ... Is namespace hell, and if you squint at the caching problem, it's actually an indexing problem, which is also related to this.

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The aphorism typically says cache invalidation is hard. Not because you don't know what index to invalidate but because it's hard to invalidate the thing at the right time.

Caching itself is quite easy, just ask the designers of speculative execution at Intel :)

If a cache doesn't have cache invalidation, it isn't a cache, it's a database.

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