Not only invalidation. Let imagine - you don't have a cached value, so you have generate it. Obviously, that decision would be made in 10 threads at 10 servers simultaneously :)
Cache invalidation is not a real problem - cache management, oh dear, is.
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As the old quote said: "There're two things that are hard in Computer Science, it's naming and cache invalidation".
Caching is not hard.
Invalidate cache is hard.
Not only invalidation. Let imagine - you don't have a cached value, so you have generate it. Obviously, that decision would be made in 10 threads at 10 servers simultaneously :)
Cache invalidation is not a real problem - cache management, oh dear, is.