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Caching in distributed systems is an important aspect for designing scalable systems. We first discuss what is a cache and why we use it. We then talk about what are the key features of a cache in a distributed system. The cache management policies of LRU and Sliding Window are mentioned here. For high performance, the cache eviction policy must be chosen carefully. To keep data consistent and memory footprint low, we must choose a write-through or write-back consistency policy. Cache management is important because of its relation to cache hit ratios and performance. We talk about various scenarios in a distributed environment. System Design Video Course: https://interviewready.io 00:00 Who should watch this video? 00:18 What is a cache? 02:14 Why not store everything in a cache? 03:00 Cache Policies 04:49 Cache Evictions and Thrashing 05:52 Consistency Problems 06:32 Local Caches 07:49 Global Caches 08:56 Where should you place a cache? 09:35 Cache Write Policies 11:38 Hybrid Write Policy? 13:10 Thank you! A complete course on how systems are designed. Along with video lectures, the course has architecture diagrams, capacity planning, API contracts, and evaluation tests. System Design Playlist: • System Design Playlist Code: https://github.com/coding-parrot/Low-... You can follow me on: Facebook: / gkcs0 Quora: https://www.quora.com/profile/Gaurav-... LinkedIn: / gaurav-sen-56b6a941 Twitter: / gkcs_ References: Guava Cache - https://github.com/google/guava/wiki/... LRU - http://www.mathcs.emory.edu/~cheung/C... https://en.wikipedia.org/wiki/Cache_r... Implementation of Sliding Window Cache policies (Caffeine) - https://github.com/ben-manes/caffeine http://highscalability.com/blog/2016/... https://docs.microsoft.com/en-us/prev...) #SystemDesign #Caching #DistributedSystems