微服务熔断限流Hystrix之Dashboard
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。
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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
org.springframework.boot
spring-boot-starter-web
org.springframework.cloud
spring-cloud-starter-netflix-eureka-server
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
org.springframework.boot
spring-boot-starter-web
org.springframework.cloud
spring-cloud-starter-netflix-eureka-client
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
org.springframework.boot
spring-boot-starter-web
org.springframework.cloud
spring-cloud-starter-netflix-eureka-client
org.springframework.cloud
spring-cloud-starter-netflix-ribbon
org.springframework.boot
spring-boot-starter-actuator
org.springframework.cloud
spring-cloud-starter-netflix-hystrix
org.springframework.cloud
spring-cloud-starter-netflix-hystrix-dashboard
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。
源码
https://github.com/gf-huanchupk/SpringCloudLearning/tree/master/chapter17
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