Readiness

Readiness vs Liveness

Check	Purpose
Readiness	Can the app accept traffic?
Liveness	Is the app alive?

Readiness Checks

@Component
public class ReadinessCheck implements HealthIndicator {
    @Override
    public Health health() {
        if (databaseConnected && cacheConnected) {
            return Health.up().build();
        }
        return Health.down().build();
    }
}

When readiness is DOWN, load balancers stop sending traffic.

Key Points

• Understanding Readiness Probe is essential for production systems
• Always consider scalability and maintainability
• Test thoroughly before deploying to production
• Monitor performance and set up alerting

Common Patterns

1. Validation: Always validate input at the boundary
2. Error Handling: Use structured error responses
3. Logging: Log key events for debugging
4. Testing: Unit, integration, and load tests
5. Documentation: Keep docs updated with code changes

Key Principles

1. Follow SOLID principles
2. Write clean, readable code
3. Test thoroughly
4. Document decisions
5. Monitor in production

Implementation

• Start simple, refactor as needed
• Use established patterns
• Consider trade-offs
• Review with peers

Continuous Improvement

• Learn from incidents
• Update documentation
• Share knowledge
• Mentor others

Key Points

• Understanding Readiness Probe is essential for production systems
• Always consider scalability and maintainability
• Test thoroughly before deploying to production
• Monitor performance and set up alerting

Common Patterns

1. Validation: Always validate input at the boundary
2. Error Handling: Use structured error responses
3. Logging: Log key events for debugging
4. Testing: Unit, integration, and load tests
5. Documentation: Keep docs updated with code changes