What are Distributed CACHES and how do they manage DATA CONSISTENCY?

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.

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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!

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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...)

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