Twelve explained choices about stale fills, hot keys, eviction, and negative results. Choose an answer, inspect its explanation, then return to the related lesson for a missed boundary.
Related lessons
Application Cache Consistency and Capacity; Cache-Aside Fill Races and Version Guards; Cache Stampede, Singleflight, and Hot-Key Budgets; Cache Memory, Eviction, and Degraded Read Paths; Negative Cache Entries and Stale-Read Contracts; Project: permit cache recovery and consistency.