Learning how to design scalable systems will help you become a better engineer.System design is a broad topic. There are a vast number of resources scattered throughout the web on system design principles. This repo is an organized collection of resources to help you learn how to build systems at scale. Learn from the open source communit

Syllabus

System design topics: start here
- Step 1: Review the scalability video lecture
- Step 2: Review the scalability article
- Next steps
Performance vs scalability
Latency vs throughput
Availability vs consistency
- CAP theorem
  - CP - consistency and partition tolerance
  - AP - availability and partition tolerance
Consistency patterns
- Weak consistency
- Eventual consistency
- Strong consistency
Availability patterns
- Fail-over
- Replication
- Availability in numbers
Domain name system
Content delivery network
- Push CDNs
- Pull CDNs
Load balancer
- Active-passive
- Active-active
- Layer 4 load balancing
- Layer 7 load balancing
- Horizontal scaling
Reverse proxy (web server)
- Load balancer vs reverse proxy
Application layer
- Microservices
- Service discovery
Database
- Relational database management system (RDBMS)
  - Master-slave replication
  - Master-master replication
  - Federation
  - Sharding
  - Denormalization
  - SQL tuning
- NoSQL
  - Key-value store
  - Document store
  - Wide column store
  - Graph Database
- SQL or NoSQL
Cache
- Client caching
- CDN caching
- Web server caching
- Database caching
- Application caching
- Caching at the database query level
- Caching at the object level
- When to update the cache
  - Cache-aside
  - Write-through
  - Write-behind (write-back)
  - Refresh-ahead
Asynchronism
- Message queues
- Task queues
- Back pressure
Communication
- Transmission control protocol (TCP)
- User datagram protocol (UDP)
- Remote procedure call (RPC)
- Representational state transfer (REST)
Security
Appendix
- Powers of two table
- Latency numbers every programmer should know
- Additional system design interview questions
- Real world architectures
- Company architectures
- Company engineering blogs
Under development
Credits
Contact info
License