The Circuit Breaker Pattern: Stopping Cascading Failures in Microservices

If you run more than a handful of services that call each other over the network, you have probably seen this failure mode: one service gets slow or starts timing out, and instead of staying contained, the problem spreads. Threads pile up waiting on responses that never come, queues back up, and eventually services that had nothing wrong with them start failing too, because they were busy waiting on the one that did. This is a cascading failure, and the circuit breaker pattern is the standard tool for stopping it. The problem: slow failures are worse than fast ones A service that returns an er