Books: Microservices best-sellers and classical books: — Building Microservices: Designing Fine-Grained Systems / Sam Newman — Microservices Patterns: With examples in Java / Chris Richardson Spring related books: — Hands-On Microservices with Spring Boot and Spring Cloud / Magnus Larsson / Packt Publishing (not the best or most detailed, but a good one to get your hands dirty with Spring and microservices) — Spring Microservices in Action / John Carnell — Cloud Native Java: Designing Resilient Systems with Spring Boot, Spring Cloud, and Cloud Foundry / Josh Long (one drawback of this book is that everything is described based on CloudFoundry) General books: — Designing Data-Intensive Applications / Martin Kleppman — Designing Distributed Systems / Brendan Burns — Cloud Native Patterns / Cornelia Davis

2. EXPLORING FAULT-TOLERANCE
PATTERNS WITH RESILIENCE4J

3. BIO
maksym_govorischev
mgovorischev@gmail.com
mgovorischev

4. FAULT-TOLERANCE CONCEPT
On-prem DC

5. FAULT-TOLERANCE CONCEPT
On-prem DC

6. RESILIENCE4J SUPPORTED PATTERNS

7. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter

8. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter • Helps to avoid circuit breaking and
bulkheading

9. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter • Helps to avoid circuit breaking and
bulkheading
• Should be based on dependencies
analysis

10. DEMO

11. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter
• Circuit Breaker

12. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter
• Circuit Breaker
CLOSED OPEN
HALF-OPEN
succes/
reset count
failure/
increment
count
reach
threshhold
succes/reset
open timeout
/ attempt
request
failure /
trip breaker

13. DEMO

14. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter
• Circuit Breaker
• Time Limiter

15. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter
• Circuit Breaker
• Time Limiter
• Fallback

16. DEMO

17. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter
• Circuit Breaker
• Time Limiter
• Fallback
• Retry
• Avoid cascade retries (retries should be
done on a single layer)
• Otherwise make your call stack
idempotent

18. RETRYING ON A SINGLE LAYER
On-prem DC
Retry layer

19. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter
• Circuit Breaker
• Time Limiter
• Fallback
• Retry
• Bulkhead

20. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter
• Circuit Breaker
• Time Limiter
• Fallback
• Retry
• Bulkhead
Service A
Service B Service C
Connection Pool

21. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter
• Circuit Breaker
• Time Limiter
• Fallback
• Retry
• Bulkhead
Service A
Service B Service C
Connection Pool
degraded
performance

22. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter
• Circuit Breaker
• Time Limiter
• Fallback
• Retry
• Bulkhead
Service A
Service B Service C
Connection Pool
degraded
performance

23. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter
• Circuit Breaker
• Time Limiter
• Fallback
• Retry
• Bulkhead
Service A
Service B Service C
Connection Pool Connection Pool

24. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter
• Circuit Breaker
• Time Limiter
• Fallback
• Retry
• Bulkhead
Service A
Service B Service C
Connection Pool Connection Pool

25. RESILIENCE4J SUPPORTED PATTERNS
• Rate Limiter
• Circuit Breaker
• Time Limiter
• Fallback
• Retry
• Bulkhead
• Cache

26. RESILIENCE4J ASPECTS ORDER
Retry (
CircuitBreaker (
RateLimiter (
TimeLimiter (
Bulkhead ( Function )
)
)
)
)

27. CLOSING NOTES
• Know your dependencies

28. CLOSING NOTES
• Know your dependencies
• Know your consumers

29. CLOSING NOTES
• Know your dependencies
• Know your consumers
• Negotiate NFRs

30. CLOSING NOTES
• Know your dependencies
• Know your consumers
• Negotiate NFRs
• Observability is your friend

31. THANK YOU!