Solving the Hard Problems – Options for Invalidating the NGINX Cache | Etsy

NGINX makes HTTP caching really easy and extremely efficient. Underneath any caching system is an extremely hard problem lurking in the dark – cache invalidation.

While this session by Ram Nadella, Senior Software Engineer at Etsy, does not solve the cache invalidation problem itself – it is one of the two hard problems in computer science, after all) – it highlights the options available for invalidating items in the NGINX cache and introduces a new system of smart invalidation–invalidating groups of associated items based on tags.