What is Cache Warmer?
#cloud #cache
Netflix is using EVCache as a tier-0 system (caching layer) for ~14 Pb of data over ~18,000 servers. Caching layer serves multiple use cases from signup, personalization, searching, playback, and more. To limit network impact and shorten the natural warm-up time they have implemented a cache warmer infrastructure.
Cache warming is a process of populating tier-0 systems with cache values before users do that. To let all users experience similarly fast page load cache warmer creates "cold hits" for the spinning cache instance. E.g. in Netflix the first version of their cache warmer takes ~2 hours to prepare 500 mil items and 12 Tb of data for the instance to be fully ready to accept trafic.
netflixtechblog.com/cache-warming-agility-for-a-stateful-service-2d3b1da82642
