Post Syndicated from The Codeless Code original http://thecodelesscode.com/case/220

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.