微服务熔断限流Hystrix之Dashboard

2024-11-12 技术教程

简介

Hystrix Dashboard是一款针对Hystrix进行实时监控的工具，通过Hystrix Dashboard可以直观地看到各Hystrix Command的请求响应时间，请求成功率等数据。

快速上手工程说明工程名端口作用eureka-server8761注册中心service-hi8762服务提供者service-consumer8763服务消费者核心代码eureka-server 工程pom.xml

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId></dependency><dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId></dependency>application.yml

server: port: 8761eureka: instance: hostname: localhost client: register-with-eureka: false fetch-registry: false service-url: defaultZone: http://${eureka.instance.hostname}:/${server.port}/eureka/spring: application: name: eureka-server启动类

@SpringBootApplication@EnableEurekaServerpublic class EurekaServerApplication { public static void main(String[] args) { SpringApplication.run( EurekaServerApplication.class, args ); }}service-hi 工程pom.xml

server: port: 8762spring: application: name: service-hieureka: client: service-url: defaultZone: http://localhost:8761/eureka/HelloController

@RestControllerpublic class HelloController { @GetMapping("/hi") public String hi() { return "hello ~"; } @GetMapping("/hey") public String hey() { return "hey ~"; } @GetMapping("/oh") public String oh() { return "ah ~"; } @GetMapping("/ah") public String ah() { //模拟接口1/3的概率超时 Random rand = new Random(); int randomNum = rand.nextInt(3) + 1; if (3 == randomNum) { try { Thread.sleep( 3000 ); } catch (InterruptedException e) { e.printStackTrace(); } } return "来了老弟~"; }}启动类

@SpringBootApplication@EnableEurekaClientpublic class ServiceHiApplication { public static void main(String[] args) { SpringApplication.run( ServiceHiApplication.class, args ); }}service-consumer 工程pom.xml

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId></dependency><dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId></dependency><dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-ribbon</artifactId></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-hystrix</artifactId></dependency><dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId></dependency>application.yml

server: port: 8763 tomcat: uri-encoding: UTF-8 max-threads: 1000 max-connections: 20000spring: application: name: service-consumereureka: client: service-url: defaultZone: http://localhost:8761/eureka/management: endpoints: web: exposure: include: "*" cors: allowed-origins: "*" allowed-methods: "*"HelloService

@Servicepublic class HelloService { @Autowired private RestTemplate restTemplate; /** * 简单用法 */ @HystrixCommand public String hiService() { return restTemplate.getForObject("http://SERVICE-HI/hi" , String.class); } /** * 定制超时 */ @HystrixCommand(commandProperties = { @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "30000") }) public String heyService() { return restTemplate.getForObject("http://SERVICE-HI/hey" , String.class); } /** * 定制降级方法 */ @HystrixCommand(fallbackMethod = "getFallback") public String ahService() { return restTemplate.getForObject("http://SERVICE-HI/ah" , String.class); } /** * 定制线程池隔离策略 */ @HystrixCommand(fallbackMethod = "getFallback", threadPoolKey = "studentServiceThreadPool", threadPoolProperties = { @HystrixProperty(name="coreSize", value="30"), @HystrixProperty(name="maxQueueSize", value="50") } ) public String ohService() { return restTemplate.getForObject("http://SERVICE-HI/oh" , String.class); } public String getFallback() { return "Oh , sorry , error !"; }}HelloController

@RestControllerpublic class HelloController { @Autowired private HelloService helloService; @GetMapping("/hi") public String hi() { return helloService.hiService(); } @GetMapping("/hey") public String hey() { return helloService.heyService(); } @GetMapping("/oh") public String oh() { return helloService.ohService(); } @GetMapping("/ah") public String ah() { return helloService.ahService(); }}启动类

@SpringBootApplication@EnableEurekaClient@EnableHystrixDashboard@EnableHystrix@EnableCircuitBreakerpublic class ServiceConsumerApplication { public static void main(String[] args) { SpringApplication.run( ServiceConsumerApplication.class, args ); } @LoadBalanced @Bean public RestTemplate restTemplate() { return new RestTemplate(); }}Hystrix Dashboard 的使用JSON格式监控信息

先访问http://localhost:8762/hi
再打开http://localhost:8763/actuator/hystrix.stream，可以看到一些具体的数据：

Hystrix仪表盘监控信息

单纯的查看json数据，很难分析出结果，所以，要在Hystrix仪表盘中来查看这一段json，在hystrix仪表盘中输入监控地址进行监控：
打开仪表盘地址：http://localhost:8762/hystrix

在界面依次输入：http://localhost:8763/actuator/hystrix.stream 、2000 、service-consumer；点确定。

Hystrix仪表盘指标含义

测试

编一个测试脚本curl.sh

while true;docurl "http://localhost:8763/hi";curl "http://localhost:8763/hey";curl "http://localhost:8763/oh";curl "http://localhost:8763/ah";done

执行测试脚本，查看Hystrix仪表盘：

可以看出 ahService 因为模拟了1/3的概率超时，所以监控中呈现了30%左右的错误百分比。

源码

https://github.com/gf-huanchupk/SpringCloudLearning/tree/master/chapter17