Hystrix之Dashboard 实践

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-server	8761	注册中心
service-hi	8762	服务提供者
service-consumer	8763	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: 8761 eureka: 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 @EnableEurekaServer public class EurekaServerApplication { public static void main(String[] args) { SpringApplication.run( EurekaServerApplication.class, args ); } } 

service-hi 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> 

application.yml

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

HelloController

@RestController public 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 @EnableEurekaClient public 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: 20000 spring: application: name: service-consumer eureka: client: service-url: defaultZone: http://localhost:8761/eureka/ management: endpoints: web: exposure: include: "*" cors: allowed-origins: "*" allowed-methods: "*" 

HelloService

@Service public 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

@RestController public 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 @EnableCircuitBreaker public 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;
do
curl "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。