The Codeless Code: Case 220 The Two Hard Things
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A junior monk said to master Kaimu: One of the Patriarchs
claimed that there are “only two hard things” in our craft.
What are these “two hard things”?
Kaimu answered: You only need to remember that the first
hard thing is called “cache invalidation”.
The junior monk asked: Does that mean that a whole cache is
made invalid, or just some of its elements? And why call it
“invalidation” when the only error is that the data is
stale? Wouldn’t “cache element expiration” be a better
name?
Kaimu answered: Now you know the second hard thing.
