前言

ZipKin Server默认将追踪数据信息保存到内存，但这种方式不适合生产环境。Zipkin支持将追踪数据持久化到mysql或者elasticsearch中。
本章代码已分享至Gitee: https://gitee.com/lengcz/springcloudalibaba01.git
使用mysql实现数据信息持久化

一. 如何将zipkin数据持久化到mysql

新建一个数据库，名称为zipkin，执行建表语句
建表脚本的官方地址:https://github.com/openzipkin/zipkin/blob/master/zipkin-storage/mysql-v1/src/main/resources/mysql.sql，sql脚本建议从官方地址获取最新。

 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;

在启动zipkin server的时候，指定数据保存的mysql信息

java -jar zipkin-server-2.23.18-exec.jar --STORAGE_TYPE=mysql --MYSQL_HOST=127.0.0.1 --MYSQL_TCP_PORT=3306 --MYSQL_DB=zipkin --MYSQL_USER=root --MYSQL_PASS=123456

请求下单接口，http://127.0.0.1:7000/server-order/order/prod/3, 此时访问zipkin server（http://localhost:9411/zipkin/）会产生一条记录。
重启zipkin server ,再次查看日志，数据依然还在，表明数据持久化到mysql成功。