笔记11：Spring Cloud分布式链路追踪技术 Sleuth + Zipkin

1. Sleuth 每⼀个需要被追踪踪迹的微服务⼯程都引⼊依赖坐标
   1）pom

   <!--链路追踪-->
   <dependency>
       <groupId>org.springframework.cloud</groupId>
       <artifactId>spring-cloud-starter-sleuth</artifactId>
   </dependency>
   

   2）ym

   #分布式链路追踪
   logging:
     level:
       org.springframework.web.servlet.DispatcherServlet: debug
       org.springframework.cloud.sleuth: debug
   

2. Zipkin Server 构建
   1）pom

   <!--zipkin-server的依赖坐标-->
   <dependency>
       <groupId>io.zipkin.java</groupId>
       <artifactId>zipkin-server</artifactId>
       <version>2.12.3</version>
       <exclusions>
           <!--排除掉log4j2的传递依赖，避免和springboot依赖的⽇
          志组件冲突-->
           <exclusion>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-log4j2</artifactId>
           </exclusion>
       </exclusions>
   </dependency>
   <!--zipkin-server ui界⾯依赖坐标-->
   <dependency>
       <groupId>io.zipkin.java</groupId>
       <artifactId>zipkin-autoconfigure-ui</artifactId>
       <version>2.12.3</version>
   </dependency>
   

   2）yml

   server:
     port: 9411
   management:
     metrics:
       web:
         server:
           # 关闭⾃动检测请求
           auto-time-requests: false
   

   3）启动类
   

3. Zipkin Client 构建（在具体微服务中修改，即需要被追踪踪迹的微服务）
   1）pom

   <!-- zipkin client -->
   <dependency>
       <groupId>org.springframework.cloud</groupId>
       <artifactId>spring-cloud-starter-zipkin</artifactId>
   </dependency>
   

   2）yml

   spring:
     application:
       name: service-resume    
     # zipkin client
     zipkin:
       base-url: http://127.0.0.1:9411 # zipkin server的请求地址
       sender:
         # web 客户端将踪迹⽇志数据通过⽹络请求的⽅式传送到服务端，另外还有配置
         # kafka/rabbit 客户端将踪迹⽇志数据传递到mq进⾏中转
         type: web
     sleuth:
       sampler:
         # 采样率 1 代表100%全部采集 ，默认0.1 代表10% 的请求踪迹数据会被采集
         # ⽣产环境下，请求量⾮常⼤，没有必要所有请求的踪迹数据都采集分析，
         # 对于⽹络包括server端压⼒都是⽐较⼤的，
         # 可以配置采样率采集⼀定⽐例的请求的踪迹数据进⾏分析即可
         probability: 1
   

4. server 界面
   1）启动后访问地址：http://localhost:9411

5. Zipkin Server服务区 -> 追踪数据Zipkin持久化到mysql
   1）创建数据库
   数据库名 -> zipkin
   2）表

   --
   -- Copyright 2015-2019 The OpenZipkin Authors
   --
   -- Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
   -- in compliance with the License. You may obtain a copy of the License at
   --
   -- http://www.apache.org/licenses/LICENSE-2.0
   --
   -- Unless required by applicable law or agreed to in writing, software distributed under the License
   -- is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
   -- or implied. See the License for the specific language governing permissions and limitations under
   -- the License.
   --
   
   CREATE TABLE IF NOT EXISTS zipkin_spans (
     `trace_id_high` BIGINT NOT NULL DEFAULT 0 COMMENT 'If non zero, this means the trace uses 128 bit traceIds instead of 64 bit',
     `trace_id` BIGINT NOT NULL,
     `id` BIGINT NOT NULL,
     `name` VARCHAR(255) NOT NULL,
     `remote_service_name` VARCHAR(255),
     `parent_id` BIGINT,
     `debug` BIT(1),
     `start_ts` BIGINT COMMENT 'Span.timestamp(): epoch micros used for endTs query and to implement TTL',
     `duration` BIGINT COMMENT 'Span.duration(): micros used for minDuration and maxDuration query',
     PRIMARY KEY (`trace_id_high`, `trace_id`, `id`)
   ) ENGINE=InnoDB ROW_FORMAT=COMPRESSED CHARACTER SET=utf8 COLLATE utf8_general_ci;
   
   ALTER TABLE zipkin_spans ADD INDEX(`trace_id_high`, `trace_id`) COMMENT 'for getTracesByIds';
   ALTER TABLE zipkin_spans ADD INDEX(`name`) COMMENT 'for getTraces and getSpanNames';
   ALTER TABLE zipkin_spans ADD INDEX(`remote_service_name`) COMMENT 'for getTraces and getRemoteServiceNames';
   ALTER TABLE zipkin_spans ADD INDEX(`start_ts`) COMMENT 'for getTraces ordering and range';
   
   CREATE TABLE IF NOT EXISTS zipkin_annotations (
     `trace_id_high` BIGINT NOT NULL DEFAULT 0 COMMENT 'If non zero, this means the trace uses 128 bit traceIds instead of 64 bit',
     `trace_id` BIGINT NOT NULL COMMENT 'coincides with zipkin_spans.trace_id',
     `span_id` BIGINT NOT NULL COMMENT 'coincides with zipkin_spans.id',
     `a_key` VARCHAR(255) NOT NULL COMMENT 'BinaryAnnotation.key or Annotation.value if type == -1',
     `a_value` BLOB COMMENT 'BinaryAnnotation.value(), which must be smaller than 64KB',
     `a_type` INT NOT NULL COMMENT 'BinaryAnnotation.type() or -1 if Annotation',
     `a_timestamp` BIGINT COMMENT 'Used to implement TTL; Annotation.timestamp or zipkin_spans.timestamp',
     `endpoint_ipv4` INT COMMENT 'Null when Binary/Annotation.endpoint is null',
     `endpoint_ipv6` BINARY(16) COMMENT 'Null when Binary/Annotation.endpoint is null, or no IPv6 address',
     `endpoint_port` SMALLINT COMMENT 'Null when Binary/Annotation.endpoint is null',
     `endpoint_service_name` VARCHAR(255) COMMENT 'Null when Binary/Annotation.endpoint is null'
   ) ENGINE=InnoDB ROW_FORMAT=COMPRESSED CHARACTER SET=utf8 COLLATE utf8_general_ci;
   
   ALTER TABLE zipkin_annotations ADD UNIQUE KEY(`trace_id_high`, `trace_id`, `span_id`, `a_key`, `a_timestamp`) COMMENT 'Ignore insert on duplicate';
   ALTER TABLE zipkin_annotations ADD INDEX(`trace_id_high`, `trace_id`, `span_id`) COMMENT 'for joining with zipkin_spans';
   ALTER TABLE zipkin_annotations ADD INDEX(`trace_id_high`, `trace_id`) COMMENT 'for getTraces/ByIds';
   ALTER TABLE zipkin_annotations ADD INDEX(`endpoint_service_name`) COMMENT 'for getTraces and getServiceNames';
   ALTER TABLE zipkin_annotations ADD INDEX(`a_type`) COMMENT 'for getTraces and autocomplete values';
   ALTER TABLE zipkin_annotations ADD INDEX(`a_key`) COMMENT 'for getTraces and autocomplete values';
   ALTER TABLE zipkin_annotations ADD INDEX(`trace_id`, `span_id`, `a_key`) COMMENT 'for dependencies job';
   
   CREATE TABLE IF NOT EXISTS zipkin_dependencies (
     `day` DATE NOT NULL,
     `parent` VARCHAR(255) NOT NULL,
     `child` VARCHAR(255) NOT NULL,
     `call_count` BIGINT,
     `error_count` BIGINT,
     PRIMARY KEY (`day`, `parent`, `child`)
   ) ENGINE=InnoDB ROW_FORMAT=COMPRESSED CHARACTER SET=utf8 COLLATE utf8_general_ci;
   

   3）zipkin server 9411 -> pom加入mysql依赖

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   <!-- zipkin针对mysql持久化的依赖 -->
   <dependency>
       <groupId>io.zipkin.java</groupId>
       <artifactId>zipkin-autoconfigure-storage-mysql</artifactId>
       <version>2.12.3</version>
   </dependency>
   <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
   </dependency>
   <dependency>
       <groupId>com.alibaba</groupId>
       <artifactId>druid-spring-boot-starter</artifactId>
       <version>1.1.10</version>
   </dependency>
   <!-- 事务控制 -->
   <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-tx</artifactId>
   </dependency>
   <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-jdbc</artifactId>
   </dependency>
   

   4）yml添加

   spring:
   	  datasource:
   	    driver-class-name: com.mysql.cj.jdbc.Driver
   	    url: jdbc:mysql://localhost:3306/zipkin?useUnicode=true&characterEncoding=utf8&useSSL=false&allowMultiQueries=true&serverTimezone=UTC
   	    username: root
   	    password: 123456
   	    druid:
   	      initialSize: 10
   	      minIdle: 10
   	      maxActive: 30
   	      maxWait: 50000
   	# 指定zipkin持久化介质为mysql
   	zipkin:
   	  storage:
   	    type: mysql
   

   5）启动类注⼊事务管理器