System Design Concepts

Scalability Lecture At Harvard CS75

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Scale From Zero To Millions Of Users

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How Web Works

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What really happens when you navigate to a URL

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Scalability Basics

• What is Vertical Scaling?

• What is Horizontal Scaling?

• What is a Single Point of Failure (SPOF)?

• What is Resiliency? How do you make systems resilient?

• What is Redundancy? How do you introduce redundancy in systems?

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More on Scalability

• Clones
• Databases
• Caches
• Asynchronism

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Load Balancing

• Load Balancer

• Types of Load Balancers – Based on Functions

  • Layer 4
  • Layer 7

• Types of Load Balancers – Based on Configurations

  • Hardware Load Balancers
  • Software Load Balancers

• Load Balancer Configurations

  • Active-Active
  • Active-Passive

• Load Balancing Algorithms

• Session Persistence or Sticky Sessions

  • Duration-based session persistence
  • Application-controlled session persistence

• Proxy vs Forward Proxy vs Reverse Proxy

• Load Balancer vs Reverse Proxy

• Load Balancer vs API Gateway

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High level trade-offs

• Performance vs scalability

• Latency vs throughput

• Availability vs consistency

• CAP Theorem

  • Story
  • Picture
  • Video

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Consistency Patterns

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Availability Patterns

• Video
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Availability in numbers

• AWS
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Domain name system

Video

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cloudflare

A Comprehensive Guide to How It Works

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Content delivery network

Video

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What is CDN?

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