Distributed Caching Strategies Questions

Design and tradeoffs for caching at scale across an entire fleet. Candidates should discuss multi level caches including in process caches, remote caches such as Redis, and edge caches such as content delivery networks, and describe cache invalidation strategies, write through versus write back options, consistent hashing for sharding, handling cache stampedes, negative caching, TTL design, cache warming and preloading, eviction policies, and monitoring cache hit rates and cost versus performance tradeoffs.