SpringCloud Sleuth分布式请求链路跟踪

概述

为什么会出现这个技术？需要解决哪些问题？

在微服务框架中，一个由客户端发起的请求在后端系统中会经过多个不同的的服务节点调用来协同产生最后的请求结果，每一个前端请求都会形成一条复杂的分布式服务调用链路，链路中的任何一环出现高延时或错误都会引起整个请求最后的失败。

 Spring Cloud Sleuth提供了一套完整的服务跟踪的解决方案。在分布式系统中提供追踪解决方案并且兼容支持了zipkin

搭建链路监控步骤

zipkin 

下载

SpringCloud从F版起已不需要自己构建Zipkin Server了，只需调用jar包即可。https://dl.bintray.com/openzipkin/maven/io/zipkin/java/zipkin-server/

zipkin-server-2.12.9-exec.jar

运行jar

java -jar zipkin-server-2.12.9-exec.jar

 出现上面图案表示启动成功

运行控制台

http://localhost:9411/zipkin/

完整的调用链路 ，表示一请求链路。

 一条链路通过Trace Id唯一标识，Span标识发起的请求信息，各span通过parent id 关联起来

 Trace:类似于树结构的Span集合，表示一条调用链路，存在唯一标识

span:表示调用链路来源，通俗的理解span就是一次请求信息

服务提供者

 cloud-provider-payment8001        

pom

<dependencies>
        <!--包含了sleuth+zipkin-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>
        <!--eureka-client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency><!-- 引入自己定义的api通用包，可以使用Payment支付Entity -->
            <groupId>com.zjh.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <!--mysql-connector-java-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--jdbc-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

yml

server:
  port: 8001

spring:
  application:
    name: cloud-payment-service
  zipkin:
    base-url: http://localhost:9411
  sleuth:
    sampler:
      #采样率值介于 0 到 1 之间，1 则表示全部采集
     probability: 1
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource            # 当前数据源操作类型
    driver-class-name: org.gjt.mm.mysql.Driver              # mysql驱动包
    url: jdbc:mysql://localhost:3306/db2019?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: 123456

eureka:
  client:
    #表示是否将自己注册进EurekaServer默认为true。
    register-with-eureka: true
    #是否从EurekaServer抓取已有的注册信息，默认为true。单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡
    fetchRegistry: true
    service-url:
      #defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka  # 集群版
      defaultZone: http://localhost:7001/eureka  # 单机版
  instance:
    instance-id: payment8001
    #访问路径可以显示IP地址
    prefer-ip-address: true
    #Eureka客户端向服务端发送心跳的时间间隔，单位为秒(默认是30秒)
    lease-renewal-interval-in-seconds: 1
    #Eureka服务端在收到最后一次心跳后等待时间上限，单位为秒(默认是90秒)，超时将剔除服务
    lease-expiration-duration-in-seconds: 2


mybatis:
  mapperLocations: classpath:mapper/*.xml
  type-aliases-package: com.atguigu.springcloud.entities    # 所有Entity别名类所在包

 
 
 
 

业务类PaymentController

@GetMapping("/payment/zipkin")
public String paymentZipkin()
{
    return "hi ,i'am paymentzipkin server fall back，welcome to atguigu，O(∩_∩)O哈哈~";
}
 

服务消费者(调用方)

cloud-consumer-order80

<dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <!--包含了sleuth+zipkin-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>
        <dependency><!-- 引入自己定义的api通用包，可以使用Payment支付Entity -->
            <groupId>com.zjh.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

yml

server:
  port: 80

spring:
    application:
        name: cloud-order-service
    zipkin:
      base-url: http://localhost:9411
    sleuth:
      sampler:
        probability: 1

eureka:
  client:
    #表示是否将自己注册进EurekaServer默认为true。
    register-with-eureka: true
    #是否从EurekaServer抓取已有的注册信息，默认为true。单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡
    fetchRegistry: true
    service-url:
      #defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/
      defaultZone: http://eureka7001.com:7001/eureka

 
 

业务类controller

@GetMapping("/consumer/payment/zipkin")
public String paymentZipkin()
{
    String result = restTemplate.getForObject("http://localhost:8001"+"/payment/zipkin/", String.class);
    return result;
}
 

依次启动eureka7001/8001/80

80调用8001几次测试下

打开浏览器访问：http://localhost:9411

会出现一下界面

 查看

 查看依赖关系

 原理

eureka:

Eureka基础_不知名路人～的博客-优快云博客

其余模块

Rest微服务工程构建_不知名路人～的博客-优快云博客