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Service Mesh vs. Frameworks: Where to put the resilience?
The document discusses the comparison between service meshes and frameworks in the context of resilience in distributed systems. It outlines various resilience patterns, highlights the characteristics of service meshes and frameworks, and emphasizes the importance of managing resilience effectively. The conclusion points out the flexibility of service meshes while noting the absence of fallback mechanisms, which are considered overrated.
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Service Mesh vs. Frameworks: Where to put the resilience?
- 1. Service Mesh vs.Frameworks: Where to put the resilience? Michael Hofmann https://hofmann-itconsulting.de
- 2. (1) Distributed Systemsand Resilience (2) Framework (3) Service Mesh (4) Framework and Service Mesh Characteristics (5) Thoughts about Resilience (6) Essential Requirements (7) Conclusion Agenda
- 3. Distributed Systems ➔ degreeof distribution raises failure rate! ➔ compensation strategy: resilience! slow response timeout aborted network connection ... Typical Communication Errors Fallacies of Distributed Computing The network is reliable. Latency is zero. Bandwidth is infinite. The network is secure. Topology doesn't change. There is one administrator. Transport cost is zero. The network is homogeneous.
- 4. Hystrix Alternative: Service Mesh?! Resilience Resilience4J Failsafe MicroProfileFault Tolerance … Framework „DEATH“ Framework ACTIVE
- 5. Resilience Patterns ─ Timeout ─ Retry ─ Fallback ─ Circuit Breaker ─ Bulkhead manymore: Uwe Friedrichsen: “Patterns of resilience” https://www.slideshare.net/ufried/patterns-of-resilience
- 6. @CircuitBreaker(successThreshold = 10, requestVolumeThreshold= 4, failureRatio=0.5, delay = 1000) public Connection serviceA() { Connection conn = null; counterForInvokingServiceA++; conn = connectionService(); return conn; } MicroProfile Fault Tolerance @Retry(maxRetries = 3) @Fallback(fallbackMethod = "doFallback") public Result doWork() { return callServiceA(); // fallback on RuntimeException } private Result doFallback() { return ...; }
- 7. Service Mesh The termservice mesh is used to describe the network of microservices that make up such application and the interactions between them. (istio.io) Don’t manage a Service Mesh without tooling! Requirements: (1) manage calls on layer 7 (application layer, L7) (2) resilience, routing, security and telemetry (3) decentralized & transparent for services (implementation independent)
- 8.
- 9. Resilience Patterns inIstio ✔ Timeout ✔ Retry ✔ CircuitBreaker ✔ Bulkhead ✗ Fallback? ✗ is a Fallback possible? ✗ less technical, more business driven https://dzone.com/articles/fallbacks-are-overrated-architecting-for-resilienc
- 10. Resilience in Istio $kubectl apply -f - <<EOF apiVersion: networking.istio.io/v1alpha3 kind: VirtualService metadata: name: reviews spec: hosts: - reviews http: - route: - destination: host: reviews subset: v1 retries: attempts: 3 perTryTimeout: 2s EOF $ kubectl apply -f - <<EOF apiVersion: networking.istio.io/v1alpha3 kind: DestinationRule metadata: name: reviews spec: host: reviews trafficPolicy: connectionPool: tcp: maxConnections: 1 http: http1MaxPendingRequests: 1 maxRequestsPerConnection: 1 outlierDetection: consecutiveErrors: 1 interval: 1s baseEjectionTime: 3m maxEjectionPercent: 100 EOF
- 11. Resilience in Istio Applyto sidecar Resilience rules — transparent for service — act global on all sidecars Fault Injection MicroProfile with Istio setting apiVersion:networking.istio.io/ v1alpha3 kind: VirtualService metadata: name: ratings ... spec: hosts: - ratings http: - fault: delay: fixedDelay: 7s percent: 100 MP_Fault_Tolerance_NonFallback_Enabled = false
- 12. Frameworks Characteristics — Java: alot of different frameworks — Team decides framework?!? — Learning curve for every framework — Different frameworks behave different — Same framework in different version behave different — Same framework in different versions parallel in use
- 13. Frameworks Characteristics ➔ Changeof framework: ➔ Replace all positions in code ➔ New behavior ➔ New deployment ➔ New tests ➔ Risk of chain reaction: framework ➔ load balancing ➔ service registry ➔ Multiple service registries for every different framework?
- 14. Service Mesh Characteristics — Definenew rule — Same behavior (… no framework change) — unchanged deployed service — new tests only for new rules — Client-side load balancing in sidecar — Service Registry based on endpoints in K8S $ kubectl apply -f ...
- 15. Thoughts about Resilience Resiliencepattern still correct if communication behavior changes? — Modified behavior of partner — Modified communication partner — Modified infrastructure — Load changes during day — Side effects from other systems — Anticipate problems of tomorrow?
- 16. Thoughts about Resilience — Mainproblem: choose the right resilience pattern — Correct parameters for pattern? — Measure resilience — Mostly: try & error for suitable pattern/params (main reason for end of life in hystrix) — Often: retry storm — Often: missing musketeer principle (black sheep)
- 17. Essential Requirements — Modification: Quickand easy change of (1) params for chosen pattern (2) resilience pattern — Test — Monitoring — No black sheep
- 18. Essential Requirements Istio Framework Modification +Modify Params - Change Pattern: Lifecycle Test Fault Injection complicated Monitoring + + Black Sheep No: rule in all sidecars $ kubectl apply -f ...
- 19. Conclusion — Comparable resilience patterns — Missingfallback in service mesh (but overrated) — Higher flexibility in service mesh — Fault injection easy in service mesh Solve problems where they arise! Service Mesh for L4-L7 Developer for L8 (original profession)