Code AnalysisBeginner 60s

Cache aside stampede on hot key expiry

A hot product key expires and 5,000 concurrent requests all miss and hit the DB at once. What failure mode is shown?

Starter code

val = cache.get(key)
if val is None:
    val = db.query(key)   # all 5k requests run this
    cache.set(key, val, ttl=60)
return val

Think you can answer under pressure?

Get matched and answer live questions in 3-minute 1v1 battles. Elo ranking, badge tiers and bragging rights on the line.