Caching is an amazingly effective technique to reduce latency. It helps build scalable, distributed systems.

We first discuss what is a cache and why we use it. We then talk about the key features of a cache in a distributed system.

Cache management is important because of its relation to cache hit ratios and performance. We talk about various scenarios in a distributed environment.

Benefits of a cache:

1. Saves network calls
2. Avoids repeated computations
3. Reduces DB load

Drawbacks of a cache:
1. Can be expensive to host
2. Potential thrashing
3. Eventual consistency

Cache Write Policies:
1. Writethrough
2. Writeback
3. Writearound

Cache Replacement Policies:
1. LRU
2. LFU
3. Segmented LRU

00:00 What is a cache?
00:20 Caching use cases
03:42 Caching limitations
06:33 Drawbacks
09:42 Cache Placement

Caching resources listed together (click on the resources tab):
https://interviewready.io/learn/syste...

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