Cloud Bits: Circuit Breakers – The First Line of Defense in Cloud-Native Resilience – Distributed Computing Musings

Circuit breakers are essential fault-tolerance patterns for cloud-native applications that prevent cascading failures by monitoring service health and providing fallback mechanisms. The pattern introduces three states (open, closed, half-open) to manage service communication during failures. The article demonstrates practical implementations using Spring Cloud with Resilience4j library and Istio service mesh, showing how to configure retry policies, failure thresholds, and fallback responses through a hospital patient registration system example.