feign + hystrix 监控和熔断测试
修改sp09-feign项目
pom.xml 添加 hystrix 起步依赖
feign 没有包含完整的 hystrix 依赖
右键点击项目,编辑起步依赖,添加hystrix依赖
<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-hystrix</artifactId></dependency>
主程序添加 @EnableCircuitBreaker
package cn.tedu.sp09;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;import org.springframework.cloud.openfeign.EnableFeignClients;public class Sp09FeignApplication {public static void main(String[] args) {SpringApplication.run(Sp09FeignApplication.class, args);}}
sp09-feign 配置 actuator，暴露 hystrix.stream 监控端点
actuator 依赖
查看pom.xml, 确认已经添加了 actuator 依赖
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency>
application.yml 暴露 hystrix.stream 端点
management:endpoints:web:exposure:include: hystrix.stream
启动服务，查看监控端点
http://localhost:3001/actuator
hystrix dashboard
启动 hystrix dashboard 服务，填入 feign 监控路径，开启监控
访问 http://localhost:4001/hystrix
填入 feign 监控路径:
http://localhost:3001/actuator/hystrix.stream访问微服务，以产生监控数据
http://localhost:3001/item-service/35
http://localhost:3001/user-service/7
http://localhost:3001/user-service/7/score?score=100
http://localhost:3001/order-service/123abc
http://localhost:3001/order-service/
熔断测试
- 用 ab 工具，以并发50次，来发送20000个请求
ab -n 20000 -c 50 http://localhost:3001/item-service/35- 断路器状态为 Open，所有请求会被短路，直接降级执行 fallback 方法