在Spring Cloud Sleuth服务链路追踪（Finchley版本）中，我们使用Spring Cloud Sleuth和zipkin的整合实现了服务链路的追踪，但是遗憾的是链路数据存储在内存中，无法持久化。zipkin的持久化可以结合Elasticsearch，MySQL实现。本节在Spring Cloud Sleuth服务链路追踪（Finchley版本）的基础上整合MySQL进行链路数据的持久化。本节示例工程如下：
| 服务 | 端口 | 服务说明 |
|---|---|---|
| eureka | 8761 | 服务注册于发现 |
| provider | 8800 | 服务提供者 |
| consumer | 8801 | 服务消费者 |
| chainMonitor | 8770 | 链路追踪服务端，mysql存储链路数据 |
在这里我们只需对chainMonitor进行部分修改即可，其它服务不用做更改。
1.添加依赖支持mysql存储链路数据
4.0.0
priv.simon
chainmonitor
0.0.1-SNAPSHOT
jar
chainmonitor
Demo project for Spring Boot
org.springframework.boot
spring-boot-starter-parent
2.0.5.RELEASE
UTF-8
UTF-8
1.8
Finchley.SR1
org.springframework.boot
spring-boot-starter-web
org.springframework.cloud
spring-cloud-starter-netflix-eureka-client
io.zipkin.java
zipkin-autoconfigure-ui
2.11.5
io.zipkin.java
zipkin-server
2.11.5
io.zipkin.java
zipkin-autoconfigure-storage-mysql
2.11.5
io.zipkin.zipkin2
zipkin-storage-mysql-v1
2.11.5
org.jooq
jooq
3.11.4
mysql
mysql-connector-java
org.springframework.boot
spring-boot-starter-jdbc
org.springframework.boot
spring-boot-starter-test
test
org.apache.commons
commons-dbcp2
2.3.0
org.springframework.cloud
spring-cloud-dependencies
${spring-cloud.version}
pom
import
org.springframework.boot
spring-boot-maven-plugin
由于Spring Boot 2.0之后官方不再建议自定义zipkin，建议使用官方提供的zipkin.jar包，将springboot升级至2.0后，发现zipkin2使用mysql做日志存储会出错，需要添加以下依赖：
org.jooq
jooq
3.11.4
另外启动的时候发现，zipkin使用Spring Boot 2.0 默认的数据库连接池hikaricp会有问题，无法启动，这里改成了dbcp2数据库连接池：
org.apache.commons
commons-dbcp2
2.3.0
2.配置文件
server:
port: 8770
spring:
application:
name: chainmonitor
datasource:
url: jdbc:mysql://localhost:3306/zipkin?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&useSSL=false
username: root
password: 123456
driver-class-name: com.mysql.jdbc.Driver
initialization-mode: always
continue-on-error: true
schema: classpath:/zipkin.sql
dbcp2:
#初始化连接:连接池启动时创建的初始化连接数量
initial-size: 50
#从连接池获取一个连接时，最大的等待时间,连接池会等待N毫秒，等待不到，则抛出异常
max-wait-millis: 60000
#最大空闲连接:连接池中容许保持空闲状态的最大连接数量,超过的空闲连接将被释放,如果设置为负数表示不限制
max-idle: 100
#通过这个池创建连接的默认自动提交状态。如果不设置，则setAutoCommit 方法将不被调用
default-auto-commit: true
#通过这个池创建连接的默认只读状态
default-read-only: false
#指明在从池中租借对象时是否要进行验证有效，如果对象验证失败，则对象将从池子释放，然后我们将尝试租借另一个
test-on-borrow: true
type: org.apache.commons.dbcp2.BasicDataSource
jpa:
database: mysql
show-sql: true
hibernate:
ddl-auto: update
properties:
hibernate:
dialect: org.hibernate.dialect.MySQL5Dialect
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
management:
metrics:
web:
server:
auto-time-requests: false
zipkin:
storage:
type: mysql
zipkin持久化数据需要建立三张表用于存储数据，这三张表会在服务启动的时候创建。其中
spring:
datasource:
schema: classpath:/zipkin.sql
指定创建表的语句在资源文件夹下。
3.sql语句
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,
`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'
) ENGINE=InnoDB ROW_FORMAT=COMPRESSED CHARACTER SET=utf8 COLLATE utf8_general_ci;
ALTER TABLE zipkin_spans ADD UNIQUE KEY(`trace_id_high`, `trace_id`, `id`) COMMENT 'ignore insert on duplicate';
ALTER TABLE zipkin_spans ADD INDEX(`trace_id_high`, `trace_id`, `id`) COMMENT 'for joining with zipkin_annotations';
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(`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';
ALTER TABLE zipkin_annotations ADD INDEX(`a_key`) COMMENT 'for getTraces';
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
) ENGINE=InnoDB ROW_FORMAT=COMPRESSED CHARACTER SET=utf8 COLLATE utf8_general_ci;
ALTER TABLE zipkin_dependencies ADD UNIQUE KEY(`day`, `parent`, `child`);
4. 测试
-
依次启动服务：eureka->provider->consumer->chainMonitor,此时发现数据库已经创建了三张表，并且chainMonitor访问正常
创建的表 -
访问provider或consumer服务，表中插入了数据
表数据 -
重启chainMonitor服务，可以查询到链路数据，持久化成功
查询界面
github下载示例代码