Hystrix Circuit Never Closes After Opening

I am seeing that circuit breakers that open do to a failure in a downstream service remain open and never close again when the downstream service is once again functioning. I am able to reproduce this in Brixton.RELEASE but not in the latest Angel release.

To reproduce the problem clone these three git projects and run them locally by running mvn spring-boot:run. https://github.com/ryanjbaxter/ocr-eureka https://github.com/ryanjbaxter/ocr-races https://github.com/ryanjbaxter/ocr-participants

If you hit http://localhost:8282/participants that will call the /participants route in the ocr-races service. Notice this will end up calling a method protected by a circuit breaker. If you then shut down the ocr-participants service and continue hitting /participants the circuit will open as expected. If you now restore the ocr-participants service and continue hitting /participants the circuit will never close again, no matter how long you wait.

Further experimentation has revealed that this only occurs when using a Feign client. If you use a RestTemplate (load balanced or just a vanilla RestTemplate) to call the downstream service than the circuit opens and closes as expected.

[dsyer]

The sample here doesn’t use Feign: https://github.com/spring-cloud-samples/tests/tree/master/hystrix and it has the same problem

[ryanjbaxter]

Fixed via #1278