Cache Strategies & Invalidation

Cache placement, eviction and the invalidation problem; distributed caches and their failure modes; CDNs, the edge, and how large media actually reaches a browser. The cheapest scaling you will ever do, and the easiest to get wrong.

This module is 03.1 of the 4 in Caching & Delivery. It runs about 4 hours across 5 lessons, and closes with Invalidate — Keep a hit rate above 90% while writes arrive. Serve one stale value to the wrong reader and you lose the round.