Caching in distributed systems: A friendly introduction

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. Write-through

2. Write-back

3. Write-around

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/system-design-course/caches-deep-dive/caching-basics

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