Hystrix集群及监控turbine
前面Dashboard演示的仅仅是单机服务监控，实际项目基本都是集群，所以这里集群监控用的是turbine。
turbine是基于Dashboard的。
先搞个集群；
再microservice-student-provider-hystrix-1004项目的基础上再搞一个microservice-student-provider-hystrix
代码和配置都复制一份，然后修改几个地方；
1、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/t224?useUnicode=true&characterEncoding=utf8 username: root password: 123 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.liuwenwu.com:2001/eureka/,http://eureka2002.liuwenwu.com:2002/eureka/,http://eureka2003.liuwenwu.com:2003/eureka/ info: groupId: com.liuwenwu.springcloud artifactId: microservice-student-provider-hystrix-1004 version: 1.0-SNAPSHOT userName: http://liuwenwu.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/t224?useUnicode=true&characterEncoding=utf8 username: root password: 123 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.liuwenwu.com:2001/eureka/,http://eureka2002.liuwenwu.com:2002/eureka/,http://eureka2003.liuwenwu.com:2003/eureka/ info: groupId: com.liuwenwu.springcloud artifactId: microservice-student-provider-hystrix-1005 version: 1.0-SNAPSHOT userName: http://liuwenwu.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/t224?useUnicode=true&characterEncoding=utf8 username: root password: 123 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.liuwenwu.com:2001/eureka/,http://eureka2002.liuwenwu.com:2002/eureka/,http://eureka2003.liuwenwu.com:2003/eureka/ info: groupId: com.liuwenwu.springcloud artifactId: microservice-student-provider-hystrix-1006 version: 1.0-SNAPSHOT userName: http://liuwenwu.com phone: 123456 hystrix: command: default: execution: isolation: thread: timeoutInMilliseconds: 1500
2、启动类配置
package com.liuwenwu.microservicestudentproviderhystrix; 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.liuwenwu.*.*") @EnableEurekaClient @SpringBootApplication public class MicroserviceStudentProviderHystrixApplication { public static void main(String[] args) { SpringApplication.run(MicroserviceStudentProviderHystrixApplication.class, args); } }
这样的话 就有了 hystrix集群服务；
3、我们新建项目microservice-student-consumer-hystrix-turbine-91
pom.xml加下依赖
<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>
4、application.yml
server: port: 91 context-path: / eureka: client: service-url: defaultZone: http://eureka2001.liuwenwu.com:2001/eureka/,http://eureka2002.liuwenwu.com:2002/eureka/,http://eureka2003.liuwenwu.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
1、新建启动类MicroserviceStudentConsumerHystrixTurbine91Application 加注解：@EnableTurbine
package com.liuwenwu.microservicestudentconsumerhystrixturbine91; 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 MicroserviceStudentConsumerHystrixTurbine91Application { public static void main(String[] args) { SpringApplication.run(MicroserviceStudentConsumerHystrixTurbine91Application.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
点击 进入集群监控仪表：
Feign、Hystrix整合
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。
1、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写具体实现：
@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(); }
2、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();
新建 StudentClientFallbackFactory 类，实现FallbackFactory<StudentClientService>接口；
package com.liuwenwu.microservicecommon.FallbackFactory; import com.liuwenwu.microservicecommon.entity.Student; import com.liuwenwu.microservicecommon.service.StudentClientService; import feign.hystrix.FallbackFactory; import org.springframework.stereotype.Component; import java.util.HashMap; import java.util.List; import java.util.Map; /** * @author LWW * @site www.lww.com * @company * @create 2019-11-23 14:50 * * 作用，将所有service层业务方法可能出现故障，需要定义对应的快速返回方法的处理集合 * add/del/edit/query... * StudentClientFallbackFactory * add/del/edit/query...对应的快速回退措施 * */ @Component public class StudentClientFallbackFactory implements FallbackFactory<StudentClientService> { @Override public StudentClientService create(Throwable throwable) { return new StudentClientService() { @Override public Student get(Integer id) { return null; } @Override public List<Student> list() { return null; } @Override public boolean save(Student student) { return false; } @Override public boolean delete(Integer id) { return false; } @Override public String ribbon() { 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; } }; } }
StudentClientService接口的@FeignClient注解加下 fallbackFactory属性
@FeignClient(value="MICROSERVICE-STUDENT",fallbackFactory=StudentClientFallbackFactory.class)
这类我们实现了 降级处理方法实现；
3、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(); }
4、microservice-common的application.yml加上hystrix支持
feign: hystrix: enabled: true
测试开启三个eureka，以及带hystrix的provider，和带feign,hystrix的consummer。
测试的话，也是没问题的。0.9秒的话，返回正常信息；超过1秒的话，就返回错误提示；
集群后超时设置
上面错误是什么原因呢，咱们明明在Hystrix中的application.yml中设置了
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
这样就完工了。可以自行测试。
