SpringCloud之Hystrix集群及集群监控turbine

目的：

　　Hystrix集群及监控turbine

　　Feign、Hystrix整合之服务熔断服务降级彻底解耦

　　集群后超时设置

---

Hystrix集群及监控turbine

　新建一个springboot工程microservice-student-provider-hystrix-1005把它作为集群

工程中测试详细代码见https://www.cnblogs.com/huangting/p/11902121.html

导入pom依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.ht</groupId>
        <artifactId>htSpringCloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <artifactId>microservice-student-provider-hystrix-1005</artifactId>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--添加注册中心Eureka相关配置-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <!-- actuator监控引入 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
        </dependency>
        <!--  修改后立即生效，热部署  -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <dependency>
            <groupId>com.ht</groupId>
            <artifactId>microservice-common</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
        <!--Hystrix相关依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

修改yml配置：

---
server:
  port: 1004
  context-path: /
spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
    username: root
    password: root
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
  application:
    name: microservice-student
  profiles: provider-hystrix-1004

eureka:
  instance:
    hostname: localhost
    appname: microservice-student
    instance-id: microservice-student:1004
    prefer-ip-address: true
  client:
    service-url:
      defaultZone: http://eureka2001.ht.com:2001/eureka/,http://eureka2002.ht.com:2002/eureka/,http://eureka2003.ht.com:2003/eureka/

info:
  groupId: com.ht.testSpringcloud
  artifactId: microservice-student-provider-hystrix-1004
  version: 1.0-SNAPSHOT
  userName: http://ht.com
  phone: 123456

hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 1500

---
server:
  port: 1005
  context-path: /
spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
    username: root
    password: root
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
  application:
    name: microservice-student
  profiles: provider-hystrix-1005

eureka:
  instance:
    hostname: localhost
    appname: microservice-student
    instance-id: microservice-student:1005
    prefer-ip-address: true
  client:
    service-url:
      defaultZone: http://eureka2001.ht.com:2001/eureka/,http://eureka2002.ht.com:2002/eureka/,http://eureka2003.ht.com:2003/eureka/

info:
  groupId: com.ht.htSpringCloud
  artifactId: microservice-student-provider-hystrix-1005
  version: 1.0-SNAPSHOT
  userName: http://ht.com
  phone: 123456

hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 1500

---
server:
  port: 1006
  context-path: /
spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
    username: root
    password: root
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
  application:
    name: microservice-student
  profiles: provider-hystrix-1006

eureka:
  instance:
    hostname: localhost
    appname: microservice-student
    instance-id: microservice-student:1006
    prefer-ip-address: true
  client:
    service-url:
      defaultZone: http://eureka2001.ht.com:2001/eureka/,http://eureka2002.ht.com:2002/eureka/,http://eureka2003.ht.com:2003/eureka/

info:
  groupId: com.ht.htSpringCloud
  artifactId: microservice-student-provider-hystrix-1006
  version: 1.0-SNAPSHOT
  userName: http://ht.com
  phone: 123456

hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 1500

启动类MicroserviceStudentProviderHystrix1005Application 中添加注释

package com.ht.microservicestudentproviderhystrix1005;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableCircuitBreaker
@EntityScan("com.ht.*.*")
@EnableEurekaClient
@SpringBootApplication
public class MicroserviceStudentProviderHystrix1005Application {

    public static void main(String[] args) {
        SpringApplication.run(MicroserviceStudentProviderHystrix1005Application.class, args);
    }

}

然后配置启动项的时候多搞几个启动项，这里搞了三个

provider-hystrix-1004
provider-hystrix-1005
provider-hystrix-1006

好了一个hystrix集群服务就搭好了。

修改pom依赖：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.ht</groupId>
        <artifactId>htSpringCloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <artifactId>microservice-student-consumer-hystrix-turbine-91</artifactId>

    <properties>
        <java.version>1.8</java.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-turbine</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

配置yml文件

server:
  port: 91
  context-path: /
eureka:
  client:
    service-url:
      defaultZone: http://eureka2001.ht.com:2001/eureka/,http://eureka2002.ht.com:2002/eureka/,http://eureka2003.ht.com:2003/eureka/
turbine:
  app-config: microservice-student   # 指定要监控的应用名称
  clusterNameExpression: "'default'" #表示集群的名字为default
spring:
  application:
    name: turbine

给启动类MicroserviceStudentConsumerHystrixTurbine91Application 加注解：@EnableTurbine

package com.ht.microservicestudentconsumerhystrixdashboard90;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
import org.springframework.cloud.netflix.turbine.EnableTurbine;
@SpringBootApplication(exclude={DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
@EnableTurbine
public class MicroserviceStudentConsumerHystrixDashboard90Application {

    public static void main(String[] args) {
        SpringApplication.run(MicroserviceStudentConsumerHystrixDashboard90Application.class, args);
    }

}

测试：
先启动三个eureka，然后把1004 1005 带hystrix的服务都启动；
microservice-student-consumer-80这个也启动，方便测试；
dashboard，turbine启动；

这样的话 http://localhost/student/hystrix 就能调用服务集群；
http://localhost:91/turbine.stream 可以监控数据，实时ping 返回data

输入http://localhost:90/hystrix进入仪表盘，输入地址，进行实时监控测试

---

Feign、Hystrix整合之服务熔断服务降级彻底解耦

前面的代码，用@HystrixCommand fallbackMethod是很不好的，因为和业务代码耦合度太高，不利于维护，所以需要解耦，这我们讲下Feign Hystrix整合。

microservice-student-provider-hystrix项目修改
我们不用原先那套。按照正常的逻辑来写；
StudentService加新的接口方法：

/**
 * 测试Hystrix服务降级
 * @return
 */
public Map<String,Object> hystrix();

StudentServiceImpl实现：

@Override
public Map<String, Object> hystrix() {
    Map<String,Object> map=new HashMap<String,Object>();
    map.put("code", 200);
    map.put("info","工号【"+port+"】正在为您服务");
    return map;
}

StudentProviderController正常调用service方法：

/**
     * 测试Hystrix服务降级
     * @return
     * @throws InterruptedException
     */
    @ResponseBody
    @GetMapping(value="/hystrix")
    @HystrixCommand(fallbackMethod="hystrixFallback")
    public Map<String,Object> hystrix() throws InterruptedException{
        Thread.sleep(2000);
//        Map<String,Object> map=new HashMap<String,Object>();
//        map.put("code", 200);
//        map.put("info","工号【"+port+"】正在为您服务");
        return studentService.hystrix();
    }

microservice-common项目新建FallbackFactory类，解耦服务熔断服务降级

StudentClientService接口，新增getInfo方法；

/**
 * 服务熔断降级
 * @return
 */
@GetMapping(value="/student/hystrix")
public Map<String,Object> hystrix();

microservice-common的application.yml加上hystrix支持
hystrix支持

feign:
  hystrix:
    enabled: true

新建 StudentClientFallbackFactory 类，实现FallbackFactory接口；

package com.ht.microservicestudentproviderhystrix.service;

import com.ht.microservicecommon.StudentClientService;
import com.ht.microservicecommon.entity.Student;
import feign.hystrix.FallbackFactory;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class StudentClientFallbackFactory implements FallbackFactory<StudentClientService> {
    @Override
    public StudentClientService create(Throwable cause) {
        return new StudentClientService() {

            @Override
            public boolean save(Student student) {
                return false;
            }

            @Override
            public List<Student> list() {
                return null;
            }

            @Override
            public Map<String, Object> hystrix() {
                Map<String,Object> map=new HashMap<String,Object>();
                map.put("code", 500);
                map.put("info", "系统繁忙，稍后重试");
                return map;
            }

            @Override
            public Student get(Integer id) {
                return null;
            }

            @Override
            public boolean delete(Integer id) {
                return false;
            }

            @Override
            public String ribbon() {
                return null;
            }
        };
    }
}

StudentClientService接口的@FeignClient注解加下 fallbackFactory属性

@FeignClient(value="MICROSERVICE-STUDENT",fallbackFactory=StudentClientFallbackFactory.class)

microservice-student-consumer-feign-80修改 支持Hystrix
StudentConsumerFeignController新增方法调用

/**
 * Feign整合Hystrix服务熔断降级
 * @return
 * @throws InterruptedException
 */
@GetMapping(value="/hystrix")
public Map<String,Object> hystrix() throws InterruptedException{
    return studentClientService.hystrix();
}

microservice-student-consumer-feign-80启动类中添加注释

package com.ht.microservicestudentconsumerfeign80;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
import org.springframework.context.annotation.ComponentScan;

@EnableEurekaClient
@EnableFeignClients(value = "com.ht.*.*")
@ComponentScan(basePackages = {"com.ht.microservicecommon.service", "com.ht.microservicestudentconsumerfeign80"})
@SpringBootApplication(exclude={DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
public class MicroserviceStudentConsumerFeign80Application {

    public static void main(String[] args) {
        SpringApplication.run(MicroserviceStudentConsumerFeign80Application.class, args);
    }

}

---

集群后超时设置

microservice-common的application.yml加上hystrix支持

这里因为还有一个 feign 也有一个超时时间的设置，当然feign底层是 ribbon的封装，所以 直接配置ribbon，ribbon默认超时也是1秒。

所以这里都是强制要求，ribbon的超时时间要大于hystrix的超时时间，否则 hystrix自定义的超时时间毫无意义。

所以还得microservice-student-consumer-feign-80上加个 ribbon超时时间设置

hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 1500

这里因为还有一个 feign 也有一个超时时间的设置，当然feign底层是 ribbon的封装，所以 直接配置ribbon，ribbon默认超时也是1秒。
所以这里都是强制要求，ribbon的超时时间要大于hystrix的超时时间，否则 hystrix自定义的超时时间毫无意义。
所以还得microservice-student-consumer-feign-80上加个 ribbon超时时间设置

ribbon:
  ReadTimeout: 10000
  ConnectTimeout: 9000

谢谢观看！