摘要：CDL是一种简单、高效的数据实时集成服务，能够从各种OLTP数据库中抓取Data Change事件，然后推送至Kafka中，最后由Sink Connector消费Topic中的数据并导入到大数据生态软件应用中，从而实现数据的实时入湖。
本文分享自华为云社区《华为FusionInsight MRS CDL使用指南》，作者：晋红轻。
说明
CDL是一种简单、高效的数据实时集成服务，能够从各种OLTP数据库中抓取Data Change事件，然后推送至Kafka中，最后由Sink Connector消费Topic中的数据并导入到大数据生态软件应用中，从而实现数据的实时入湖。
CDL服务包含了两个重要的角色：CDLConnector和CDLService。CDLConnector是具体执行数据抓取任务的实例，CDLService是负责管理和创建任务的实例。
本此实践介绍以mysql作为数据源进行数据抓取
前提条件
- MRS集群已安装CDL服务。
- MySQL数据库需要开启mysql的bin log功能（默认情况下是开启的）。
查看MySQL是否开启bin log：
使用工具或者命令行连接MySQL数据库（本示例使用navicat工具连接），执行show variables like 'log_%'命令查看。
例如在navicat工具选择"File > New Query"新建查询，输入如下SQL命令，单击"Run"在结果中"log_bin"显示为"ON"则表示开启成功。
show variables like 'log_%'
工具准备
现在cdl只能使用rest api的方式进行命令提交，所以需要提前安装工具进行调试。本文使用VSCode工具。
完成之后安装rest client插件：
完成之后创建一个cdl.http的文件进行编辑：
创建CDL任务
CDL任务创建的流程图如下所示：
说明：需要先创建一个MySQL link, 在创建一个Kafka link, 然后再创建一个CDL同步任务并启动。
MySQL link部分rest请求代码
@hostname = 172.16.9.113 @port = 21495 @host = {{hostname}}:{{port}} @bootstrap = "172.16.9.113:21007" @bootstrap_normal = "172.16.9.113:21005" @mysql_host = "172.16.2.118" @mysql_port = "3306" @mysql_database = "hudi" @mysql_user = "root" @mysql_password = "Huawei@123" ### get links get https://{{host}}/api/v1/cdl/link ### mysql link validate post https://{{host}}/api/v1/cdl/link?validate=true content-type: application/json { "name": "MySQL_link", //link名，全局唯一，不能重复 "description":"MySQL connection", //link描述 "link-type":"mysql", //link的类型 "enabled":"true", "link-config-values": { "inputs": [ { "name": "host", "value": {{mysql_host}} }, //数据库安装节点的ip { "name": "port", "value": {{mysql_port}} },//数据库监听的端口 { "name": "database.name", "value": {{mysql_database}} }, //连接的数据库名 { "name": "user", "value": {{mysql_user}} }, //用户 { "name": "password","value": {{mysql_password}} } ,//密码 { "name":"schema", "value": {{mysql_database}}}//同数据库名 ] } } ### mysql link create post https://{{host}}/api/v1/cdl/link content-type: application/json { "name": "MySQL_link", //link名，全局唯一，不能重复 "description":"MySQL connection", //link描述 "link-type":"mysql", //link的类型 "enabled":"true", "link-config-values": { "inputs": [ { "name": "host", "value": {{mysql_host}} }, //数据库安装节点的ip { "name": "port", "value": {{mysql_port}} },//数据库监听的端口 { "name": "database.name", "value": {{mysql_database}} }, //连接的数据库名 { "name": "user", "value": {{mysql_user}} }, //用户 { "name": "password","value": {{mysql_password}} } ,//密码 { "name":"schema", "value": {{mysql_database}}}//同数据库名 ] } } ### mysql link update put https://{{host}}/api/v1/cdl/link/MySQL_link content-type: application/json { "name": "MySQL_link", //link名，全局唯一，不能重复 "description":"MySQL connection", //link描述 "link-type":"mysql", //link的类型 "enabled":"true", "link-config-values": { "inputs": [ { "name": "host", "value": {{mysql_host}} }, //数据库安装节点的ip { "name": "port", "value": {{mysql_port}} },//数据库监听的端口 { "name": "database.name", "value": {{mysql_database}} }, //连接的数据库名 { "name": "user", "value": {{mysql_user}} }, //用户 { "name": "password","value": {{mysql_password}} } ,//密码 { "name":"schema", "value": {{mysql_database}}}//同数据库名 ] } }
Kafka link部分rest请求代码
### get links get https://{{host}}/api/v1/cdl/link ### kafka link validate post https://{{host}}/api/v1/cdl/link?validate=true content-type: application/json { "name": "kafka_link", "description":"test kafka link", "link-type":"kafka", "enabled":"true", "link-config-values": { "inputs": [ { "name": "bootstrap.servers", "value": "172.16.9.113:21007" }, { "name": "sasl.kerberos.service.name", "value": "kafka" }, { "name": "security.protocol","value": "SASL_PLAINTEXT" }//安全模式为SASL_PLAINTEXT，普通模式为PLAINTEXT ] } } ### kafka link create post https://{{host}}/api/v1/cdl/link content-type: application/json { "name": "kafka_link", "description":"test kafka link", "link-type":"kafka", "enabled":"true", "link-config-values": { "inputs": [ { "name": "bootstrap.servers", "value": "172.16.9.113:21007" }, { "name": "sasl.kerberos.service.name", "value": "kafka" }, { "name": "security.protocol","value": "SASL_PLAINTEXT" }//安全模式为SASL_PLAINTEXT，普通模式为PLAINTEXT ] } } ### kafka link update put https://{{host}}/api/v1/cdl/link/kafka_link content-type: application/json { "name": "kafka_link", "description":"test kafka link", "link-type":"kafka", "enabled":"true", "link-config-values": { "inputs": [ { "name": "bootstrap.servers", "value": "172.16.9.113:21007" }, { "name": "sasl.kerberos.service.name", "value": "kafka" }, { "name": "security.protocol","value": "SASL_PLAINTEXT" }//安全模式为SASL_PLAINTEXT，普通模式为PLAINTEXT ] } }
CDL任务命令部分rest请求代码
@hostname = 172.16.9.113 @port = 21495 @host = {{hostname}}:{{port}} @bootstrap = "172.16.9.113:21007" @bootstrap_normal = "172.16.9.113:21005" @mysql_host = "172.16.2.118" @mysql_port = "3306" @mysql_database = "hudi" @mysql_user = "root" @mysql_password = "Huawei@123" ### create job post https://{{host}}/api/v1/cdl/job content-type: application/json { "job_type": "CDL_JOB", //job类型,目前只支持CDL_JOB这一种 "name": "mysql_to_kafka", //job名称 "description":"mysql_to_kafka", //job描述 "from-link-name": "MySQL_link", //数据源Link "to-link-name": "kafka_link", //目标源Link "from-config-values": { "inputs": [ {"name" : "connector.class", "value" : "com.huawei.cdc.connect.mysql.MysqlSourceConnector"}, {"name" : "schema", "value" : "hudi"}, {"name" : "db.name.alias", "value" : "hudi"}, {"name" : "whitelist", "value" : "hudisource"}, {"name" : "tables", "value" : "hudisource"}, {"name" : "tasks.max", "value" : "10"}, {"name" : "mode", "value" : "insert,update,delete"}, {"name" : "parse.dml.data", "value" : "true"}, {"name" : "schema.auto.creation", "value" : "false"}, {"name" : "errors.tolerance", "value" : "all"}, {"name" : "multiple.topic.partitions.enable", "value" : "false"}, {"name" : "topic.table.mapping", "value" : "[ {"topicName":"huditableout", "tableName":"hudisource"} ]" }, {"name" : "producer.override.security.protocol", "value" : "SASL_PLAINTEXT"},//安全模式为SASL_PLAINTEXT，普通模式为PLAINTEXT {"name" : "consumer.override.security.protocol", "value" : "SASL_PLAINTEXT"}//安全模式为SASL_PLAINTEXT，普通模式为PLAINTEXT ] }, "to-config-values": {"inputs": []}, "job-config-values": { "inputs": [ {"name" : "global.topic", "value" : "demo"} ] } } ### get all job get https://{{host}}/api/v1/cdl/job ### submit job put https://{{host}}/api/v1/cdl/job/mysql_to_kafka/start ### get job status get https://{{host}}/api/v1/cdl/submissions?jobName=mysql_to_kafka ### stop job put https://{{host}}/api/v1/cdl/job/mysql_to_kafka/submissions/13/stop ### delete job DELETE https://{{host}}/api/v1/cdl/job/mysql_to_kafka
场景验证
生产库MySQL原始数据如下：
提交CDL任务之后
增加操作: insert into hudi.hudisource values (11,“蒋语堂”,38,“女”,“图”,“播放器”,28732);
对应kafka消息体：
更改操作: UPDATE hudi.hudisource SET uname=‘Anne Marie333’ WHERE uid=11;
对应kafka消息体：
删除操作：delete from hudi.hudisource where uid=11;
对应kafka消息体：
