Horizontal Scaling
Overview
Horizontal scaling (scale-out) involves adding more machines or nodes to your system to handle increased load.
Key Concepts
- Add more servers/instances
- Distribute load across multiple machines
- Linear scalability potential
Advantages
- Cost-effective (commodity hardware)
- High availability
- Fault tolerance
- Easier to scale incrementally
Challenges
- Application complexity
- Data consistency
- Network overhead
- Load balancing requirements
Implementation Strategies
- Stateless application design
- Distributed caching
- Database sharding
- Session management
- Load balancing
Best Practices
- Design for failure
- Use auto-scaling
- Implement health checks
- Monitor resource utilization
When to Use
- Web applications
- Microservices
- High traffic systems
- Cloud-native applications