Hystrix understand and use

1. What is Hystrix

　　In the micro-services architecture usually have multiple service layer calls, failure of basic services could lead to cascading failures,
and cause the entire system is unavailable, a phenomenon called avalanche effect service. Services avalanche effect is a
result of "service provider" of unavailability "service consumer" is not available and unavailable gradually enlarge the process.
If it is shown below: as a service provider A, B is the service consumer A, C and D are B Service Consumers. A
Not available Not available due to the B, and is not available to an enlarged snowball C and D, formed on the avalanche effect
a.

　　Hystrix make your system dependent services in times of failure, by isolation system depends, hypo-
stop service cascading failures, while providing a fallback mechanism fails, the failure to respond more gracefully and make your system faster to
recover from the exception.

2. Configure application.yml 

feign:
  hystrix:
    enabled: true

3.LabelClientImpl

@FeignClient(value="tensquare‐base",fallback = LabelClientImpl.class)

 

4.LabelClientImpl

@Component
public class LabelClientImpl implements LabelClient {
    @Override
    public Result findById(String id) {
        return new Result(false, StatusCode.ERROR,"熔断器启动了");
    }
}