A realization about cache entry lifetime and validation
In the process of some recent thinking about caches , I had one of those obvious realizationsabout the relationship between cache entry lifetimes and how correct youneed to be with cache (in)validation.
Under many circumstances, there is an inverse relationship: the shorteryour entries are potentially valid for, the looser and less guaranteedcorrect you can be with validating or invalidating them. Conversely, thelonger the entries live the more careful you need to be with validation;the ultimate version of this is that entries never time out
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