BigTiger: 系统设计的基本方法SNAKE原则

Here is the link. 

The process of defining the architecture, components, modules, interfaces, and data for a system to satisfy specified requirements. 

How to design NetFlix? 

Top level design:

Scenario:

Necessary: requirement/ assumptions

First step: ask how many users

  5,000,000 daily users

Second step: prediction

  2 - 10 times more - future, 3 months, Netflix - twice more users

125 users

3MBps -> peak bandwidth 3.75 Tb/s 

Storage 

  10KB

3 months later storage 5,000,000 * 2 * 10 = 100GB

Hard disk

14,000 movies

Total storage:

Application: 

service/ algorithms

Step 1: 

Step 2: 

Kilobit (Data)

First step:   

Evolve (How to advance system design?)

Step 1: analysis

  directions:

   Better: limitation

   Broad: scenarios

   Depth: small details

Angles:

  . Property

  

SNAKE:

Scenario

Necessary

Application

Kilobit

Evolve 

Micro: 

recommendations: 

u1 = {m3, m5, m7, m11)

Class Recommender{

}

Necessary (limitation)

prediction

Algorithm & Kilobit 

For movie liked by u1