无法连接到 Spring Cloud + Hystrix + Turbine 中的 Command Metric Stream - MIME 类型(“text/plain")不是“text/event-stream" [英] Unable to connect to Command Metric Stream in Spring Cloud + Hystrix + Turbine - MIME type ("text/plain") that is not "text/event-stream"

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本文介绍了无法连接到 Spring Cloud + Hystrix + Turbine 中的 Command Metric Stream - MIME 类型(“text/plain")不是“text/event-stream"的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我已经通过链接:

HystrixDashboardApplication.java

@EnableTurbine@EnableHystrixDashboard@SpringBootApplication公共类 HystrixDashboardApplication {公共静态无效主(字符串 [] args){SpringApplication.run(HystrixDashboardApplication.class, args);}}

pom.xml

<groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.0.4.RELEASE</version><relativePath/><!-- 从存储库中查找父级 --></父母><属性><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version><spring-cloud.version>Finchley.SR1</spring-cloud.version></属性><依赖项><依赖><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></依赖><依赖><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId></依赖><依赖><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-turbine</artifactId></依赖><依赖><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><范围>测试</范围></依赖></依赖项><依赖管理><依赖项><依赖><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring-cloud.version}</version><type>pom</type><范围>导入</范围></依赖></依赖项></dependencyManagement>

tollrate-billboard 应用有以下代码TollrateBillboardApplication.java

@EnableCircuitBreaker@SpringBootApplication@EnableEurekaClient公共类 TollrateBillboardApplication {公共静态无效主(字符串 [] args){SpringApplication.run(TollrateBillboardApplication.class, args);}}

DashboardController.java

@Controller公共类仪表板控制器{@负载均衡@豆公共 RestTemplate restTemplate(RestTemplateBuilder builder) {返回 builder.build();}@自动连线私人 RestTemplate restTemplate;@HystrixCommand(fallbackMethod = "getTollRateBackup")@RequestMapping("/仪表板")public String GetTollRate(@RequestParam int stationId, Model m) {TollRate tr = restTemplate.getForObject("http://pluralsight-toll-service/tollrate/" + stationId, TollRate.class);System.out.println("stationId: " + stationId);m.addAttribute("rate", tr.getCurrentRate());返回仪表板"；}public String getTollRateBackup(@RequestParam int stationId, Model m) {System.out.println("调用回退操作");m.addAttribute("rate", "1.00");返回仪表板"；}}

bootstrap.properties

spring.application.name=pluralsight-tollrate-billboard

application.properties

server.port=8082# eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/eureka.client.register-with-eureka=trueeureka.client.fetch-registry=true#http://cloud.spring.io/spring-cloud-static/Finchley.RELEASE/single/spring-cloud.html#_environment_changesmanagement.endpoints.web.exposure.include=hystrix.stream

CURL 命令结果:

curl "http://localhost:8085/clusters"

输出

<预><代码>[{"name": "PLURALSIGHT-FASTPASS-CONSOLE","link": "http://localhost:8085/turbine.stream?cluster=PLURALSIGHT-FASTPASS-CONSOLE"},{"name": "多视角收费广告牌","link": "http://localhost:8085/turbine.stream?cluster=PLURALSIGHT-TOLLRATE-BILLBOARD"}]

EDIT-1::，我使用的是hystrix-turbine"

@EnableTurbineStream@SpringBootApplication公共类 HystrixTurbineApplication {公共静态无效主(字符串 [] args){SpringApplication.run(HystrixTurbineApplication.class, args);}}

现在，我遇到以下错误:

2018-09-03 22:23:45.808 WARN 2820 --- [nio-8085-exec-5] ashboardConfiguration$ProxyStreamServlet :无法打开到 http://localhost:8085/turbine.stream 的连接?cluster=PLURALSIGHT-FASTPASS-CONSOLE:404:HTTP/1.1 4042018-09-03 22:23:45.808 WARN 2820 --- [nio-8085-exec-2] ashboardConfiguration$ProxyStreamServlet:无法打开与 http://localhost:8085/turbine.stream?cluster=PLURALSIGHT-FASTPASS-的连接控制台:404:HTTP/1.1 404

解决方案

@Sayali 我尝试在自己的系统中重现该错误，但我设法让它正常工作，您可以进行以下检查:

1) 第一个屏幕截图中的 URL 不正确.Hystrix 仪表板中的流 URL 应为:

<块引用><块引用>

http://localhost:8085/turbine.stream?cluster=PLURALSIGHT-收费广告牌

该 url 应指向主类中具有 @EnableTurbine 注释的仪表板应用程序的端口.

2) 检查您是否收到以下回复:

<块引用><块引用>

http://localhost:8082/actuator/hystrix.stream

(为此使用您的浏览器)(这应该来自您使用 @EnableCircuitBreaker 启用了 hystrix 的应用程序)

如果您收到 ping，那么至少您的 hystrix 流是可以访问的.如果没有，检查您是否有:org.springframework.boot:spring-boot-starter-actuator 依赖项和
确保在主类中具有 @EnableCircuitBreaker 的应用程序的 application.properties 文件中设置了以下属性:

management.endpoints.web.exposure.include= hystrix.stream，信息，健康

再次检查网址.

3) 在转向涡轮流之前，请先让涡轮部分工作，所以现在，您可以进行以下更改:

@EnableTurbine//代替@EnableTurbineStream@SpringBootApplication公共类 HystrixTurbineApplication {公共静态无效主(字符串 [] args){SpringApplication.run(HystrixTurbineApplication.class, args);}}

另外，使用 TurbineStream:

<块引用>

您可能希望让 Hystrix 命令将指标推送到 Turbine.Spring Cloud 通过消息传递实现了这一点.要在客户端上执行此操作，请添加依赖于 spring-cloud-netflix-hystrix-stream 和spring-cloud-starter-stream-* 您选择.

参考:http://cloud.spring.io/spring-cloud-static/Finchley.SR1/single/spring-cloud.html#_turbine_stream

我希望这会有所帮助.请发表评论以帮助我知道这是否适合您.

I already went through the link: Unable to connect to Command Metric Stream for Hystrix Dashboard with Spring Cloud and tried few options, but nothing worked out for yet. I am developing Spring Cloud Code + Hystrix + Turbine.

Could you please let me know what is the issue ? I am using Spring Boot v2.0.4.RELEASE.

HystrixDashboardApplication.java

@EnableTurbine
@EnableHystrixDashboard
@SpringBootApplication
public class HystrixDashboardApplication {

    public static void main(String[] args) {
        SpringApplication.run(HystrixDashboardApplication.class, args);
    }
}

pom.xml

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Finchley.SR1</spring-cloud.version>
    </properties>

    <dependencies>
        <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-dashboard</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-turbine</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

tollrate-billboard application has the following code TollrateBillboardApplication.java

@EnableCircuitBreaker
@SpringBootApplication
@EnableEurekaClient
public class TollrateBillboardApplication {

    public static void main(String[] args) {
        SpringApplication.run(TollrateBillboardApplication.class, args);
    }
}

DashboardController.java

@Controller
public class DashboardController {

    @LoadBalanced
    @Bean
    public RestTemplate restTemplate(RestTemplateBuilder builder) {
        return builder.build();
    }

    @Autowired
    private RestTemplate restTemplate;

    @HystrixCommand(fallbackMethod = "getTollRateBackup")
    @RequestMapping("/dashboard")
    public String GetTollRate(@RequestParam int stationId, Model m) {

        TollRate tr = restTemplate.getForObject("http://pluralsight-toll-service/tollrate/" + stationId, TollRate.class);
        System.out.println("stationId: " + stationId);
        m.addAttribute("rate", tr.getCurrentRate());
        return "dashboard";
    }

    public String getTollRateBackup(@RequestParam int stationId, Model m) { 
        System.out.println("Fallback operation called");
        m.addAttribute("rate", "1.00");
        return "dashboard";
    }
}

bootstrap.properties

spring.application.name=pluralsight-tollrate-billboard

application.properties

server.port=8082
# eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/
eureka.client.register-with-eureka=true
eureka.client.fetch-registry=true

#http://cloud.spring.io/spring-cloud-static/Finchley.RELEASE/single/spring-cloud.html#_environment_changes
management.endpoints.web.exposure.include=hystrix.stream

CURL Command Result:

curl "http://localhost:8085/clusters"

output

[
    {
        "name": "PLURALSIGHT-FASTPASS-CONSOLE",
        "link": "http://localhost:8085/turbine.stream?cluster=PLURALSIGHT-FASTPASS-CONSOLE"
    },
    {
        "name": "PLURALSIGHT-TOLLRATE-BILLBOARD",
        "link": "http://localhost:8085/turbine.stream?cluster=PLURALSIGHT-TOLLRATE-BILLBOARD"
    }
]

EDIT-1::, I am using "hystrix-turbine"

@EnableTurbineStream
@SpringBootApplication
public class HystrixTurbineApplication {

    public static void main(String[] args) {
        SpringApplication.run(HystrixTurbineApplication.class, args);
    }
}

Now, I'm getting below error:

2018-09-03 22:23:45.808  WARN 2820 --- [nio-8085-exec-5] ashboardConfiguration$ProxyStreamServlet : Failed opening connection to http://localhost:8085/turbine.stream?cluster=PLURALSIGHT-FASTPASS-CONSOLE : 404 : HTTP/1.1 404 
2018-09-03 22:23:45.808  WARN 2820 --- [nio-8085-exec-2] ashboardConfiguration$ProxyStreamServlet : Failed opening connection to http://localhost:8085/turbine.stream?cluster=PLURALSIGHT-FASTPASS-CONSOLE : 404 : HTTP/1.1 404

解决方案

@Sayali I tried recreating the error in my own system and I managed to get it working, here are a few checks you can make:

1) The URL in your 1st screenshot is incorrect. Your stream URL in the Hystrix Dashboard should be:

http://localhost:8085/turbine.stream?cluster=PLURALSIGHT-TOLLRATE-BILLBOARD

The url should be pointing to the port of the dashboard application that has @EnableTurbine annotation in your main class.

2) Check if you are getting a response for:

http://localhost:8082/actuator/hystrix.stream

(use your browser for this) (this should be coming from the application you have enabled hystrix on using @EnableCircuitBreaker)

If you're getting pings, then atleast your hystrix stream is accessible. If not, Check if you have: org.springframework.boot:spring-boot-starter-actuator in dependencies and
make sure you have the below property set in application.properties file of the application that has @EnableCircuitBreaker in the main class:

management.endpoints.web.exposure.include= hystrix.stream, info, health

Check the URL again.

3) Please get the turbine section working before moving to turbine streams, so as of now, you can make the following change:

@EnableTurbine // instead of @EnableTurbineStream
@SpringBootApplication
public class HystrixTurbineApplication {

    public static void main(String[] args) {
        SpringApplication.run(HystrixTurbineApplication.class, args);
    }
}

Also, to use TurbineStream:

you might want to have your Hystrix commands push metrics to Turbine. Spring Cloud enables that with messaging. To do so on the client, add a dependency to spring-cloud-netflix-hystrix-stream and the spring-cloud-starter-stream-* of your choice.

refer: http://cloud.spring.io/spring-cloud-static/Finchley.SR1/single/spring-cloud.html#_turbine_stream

I hope this helps. Please comment to help me know if this worked for you.

这篇关于无法连接到 Spring Cloud + Hystrix + Turbine 中的 Command Metric Stream - MIME 类型(“text/plain")不是“text/event-stream"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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