簡介 Hystrix Dashboard是一款針對Hystrix進行實時監控的工具，通過Hystrix Dashboard可以直觀地看到各Hystrix Command的請求響應時間，請求成功率等數據。 快速上手 工程說明 | 工程名 | 埠 | 作用 | | : | : | : : | | eu ...
簡介
Hystrix Dashboard是一款針對Hystrix進行實時監控的工具，通過Hystrix Dashboard可以直觀地看到各Hystrix Command的請求響應時間，請求成功率等數據。
快速上手
工程說明
| 工程名 | 埠 | 作用 |
|---|---|---|
| eureka-server | 8761 | 註冊中心 |
| service-hi | 8762 | 服務提供者 |
| service-consumer | 8763 | 服務消費者 |
核心代碼
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啟動類
@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() {
//模擬介面1/3的概率超時
Random rand = new Random();
int randomNum = rand.nextInt(3) + 1;
if (3 == randomNum) {
try {
Thread.sleep( 3000 );
} catch (InterruptedException e) {
e.printStackTrace();
}
}
return "來了老弟~";
}
}啟動類
@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;
/**
* 簡單用法
*/
@HystrixCommand
public String hiService() {
return restTemplate.getForObject("http://SERVICE-HI/hi" , String.class);
}
/**
* 定製超時
*/
@HystrixCommand(commandProperties = {
@HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "30000") })
public String heyService() {
return restTemplate.getForObject("http://SERVICE-HI/hey" , String.class);
}
/**
* 定製降級方法
*/
@HystrixCommand(fallbackMethod = "getFallback")
public String ahService() {
return restTemplate.getForObject("http://SERVICE-HI/ah" , String.class);
}
/**
* 定製線程池隔離策略
*/
@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();
}
}啟動類
@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格式監控信息
先訪問http://localhost:8762/hi
再打開http://localhost:8763/actuator/hystrix.stream，可以看到一些具體的數據：
Hystrix儀錶盤監控信息
單純的查看json數據，很難分析出結果，所以，要在Hystrix儀錶盤中來查看這一段json，在hystrix儀錶盤中輸入監控地址進行監控：
打開儀錶盤地址：http://localhost:8762/hystrix
在界面依次輸入：http://localhost:8763/actuator/hystrix.stream 、2000 、service-consumer；點確定。
Hystrix儀錶盤指標含義
測試
編一個測試腳本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執行測試腳本，查看Hystrix儀錶盤：
可以看出 ahService 因為模擬了1/3的概率超時，所以監控中呈現了30%左右的錯誤百分比。
源碼
https://github.com/gf-huanchupk/SpringCloudLearning/tree/master/chapter17
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