上一篇我们了解了Zipkin的基础知识以及Zipkin的服务端搭建。

在使用过程中很多同学发现了他的秘密，Zipkin模式将数据保存在内存中，当我们重启后，追踪数据便会丢失。其实，Zipkin也支持将追踪数据保存到MySql或者ES中。

持久化到MySql

1. 首先创建数据库，我们这里配置为zipkin（可以按照自己的意愿更改名字）
2. 创建表。建表sql地址：github.com/openzipkin/… 考虑到好多同学打开github遗产缓慢，这里贴出具体建表语句

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,
 `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;

1. 调整启动命令

   数据库和表结构创建完成了，接下来我们该调整启动命令，使用我们的数据库表保存追踪数据

nohup /tools/jdk1.8.0_271/bin/java  -jar zipkin-server-2.23.18-exec.jar --STORAGE_TYPE=mysql --MYSQL_HOST=192.168.1.168 --MYSQL_TCP_PORT=3306 --MYSQL_DB=zipkin --MYSQL_USER=root --MYSQL_PASS=root -java.tmp.dir=/var/linktracking/zipkin/temp >/dev/null >zipkin.log 2>&1 & echo $! > pidfile.txt 

4. 验证

启动zipkin-server并且进行请求，再次重启zipkin-server,可以看见依然存在请求链路录记录，并且在mysql表中也是存在记录。

持久化到ES

持久化到ES中是不需要任何其他配置，只需要将启动命令中添加连接到ES地址即可，调整启动脚本中的启动命令

nohup /tools/jdk1.8.0_271/bin/java  -jar zipkin-server-2.23.18-exec.jar --STORAGE_TYPE=elasticsearch --ES_HOSTS=localhost:9200 -java.tmp.dir=/var/linktracking/zipkin/temp >/dev/null >zipkin.log 2>&1 & echo $! > pidfile.txt 

这里需要注意，如果我们链接的是ES集群，只需要在我们指定地址后面用逗号分割即可，如下： --ES_HOSTS=http://192.168.1.1:9200,http://192.168.1.2:9200

这样我们Zipkin数据持久化便完成了，感谢大家订阅！