hard20 pts · first answer countscachingdistributed-systems

A hot cache key expires

A very popular cache key expires and thousands of requests miss at the same moment, all querying the database and overloading it. Which approach best prevents this?

A.Request coalescing (single-flight) so one request refreshes the key, plus early or jittered refresh before expiryB.Lowering the TTL of the key so it is refreshed more often by every requestC.Disabling the cache during busy hoursD.Adding a retry with no backoff when the database times out

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A hot cache key expires

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