Caching in Distributed Systems - Part III

Explores production challenges when running distributed caches, including cache avalanche (simultaneous expiration causing database overload), thundering herd (multiple clients rebuilding same cache entry), cache penetration (requests for non-existent data), hot key problems (uneven traffic distribution), large key issues (oversized cache entries), cold start scenarios (empty cache after restart), and consistency challenges between cache and database. Provides practical solutions like staggered expiration, request coalescing, bloom filters, cache warming, and TTL-based safety nets.