Glossary term
What is LRU / LFU (Least Recently / Frequently Used)?
LRU / LFU stands for Least Recently / Frequently Used.
Eviction rules for full caches. Example: LRU removes the item not used for the longest time.
Learn it properly · System DesignLesson 16: Caching Part 2: Strategies, Eviction and InvalidationAdding a cache is easy; keeping it correct is hard. The six read/write strategies, why you delete rather than update on write, eviction policies you can try by hand, invalidation per data type, and the five ways caches cause outages.