服务降级和服务熔断的区别-凯发k8官方网

一、hystrix

hystrix主要实现熔断和隔离，限流的功能基本没有，通过fallback实现服务降级和快速失败。核心是hystrixcommand。配置主要包含exection、fallback、circuitbreaker、metric、threadpool等。

二、加入依赖包

org.springframework.cloudspring-cloud-starter-hystrix1.4.7.release com.netflix.hystrixhystrix-javanica

三、在application.yml中加入配置

feign: hystrix: enabled: truehystrix:command:default:execution:timeout:enabled: trueisolation:strategy: threadthread:timeoutinmilliseconds: 8000interruptontimeout: trueinterruptoncancel: truefallback:enabled: trueisolation:semaphore:maxconcurrentrequests: 2

四、在访问接口上实现熔断、隔离和服务降级

@hystrixcommand(commandkey = "circuitbreakercommand",threadpoolkey = "circuitbreakerpool",fallbackmethod = "circuitbreakerfallbackmethod",commandproperties = {@hystrixproperty(name = "circuitbreaker.enabled", value = "true"),@hystrixproperty(name = "circuitbreaker.requestvolumethreshold", value = "2"),@hystrixproperty(name = "circuitbreaker.errorthresholdpercentage", value = "10"),@hystrixproperty(name = "circuitbreaker.sleepwindowinmilliseconds", value = "5000")}, threadpoolproperties = {@hystrixproperty(name = "coresize", value = "5") })@getmapping("/circuitbreakerhello/{id}")public string circuitbreakerhello(@pathvariable("id") int id) {if(id==2){throw new runtimeexception("exception");}return "sucessful execution" ;}public string circuitbreakerfallbackmethod(int id) {return "param " id " is wrong. circuitbreaker has been valid"; }

五、启动类上添加@enablehystrix

@springbootapplication(exclude={datasourceautoconfiguration.class}) @enablediscoveryclient @enablefeignclients @enablehystrix @mapperscan("com.sboot.dao") public class consulconsumerapplication {public static void main(string[] args) {springapplication.run(consulconsumerapplication.class, args);} }

六、测试

1、在浏览器中多次刷新如下地址，导致熔断打开

2、当访问正常得路径http://localhost:8082/circuitbreakerhello/1，也走服务降级：

3、过一会，过了休眠期，再访问正常路径，可以正常访问

总结

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