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客户要求实时同步表的数据到mysql，但这个表在tidb。
测试直接通过tidb cdc写入到mysql，有些字段是null，所以中间加了一个kafka实现

客户库中创建表

CREATE TABLE tb_1 (id bigint primary key,cid bigint,gid bigint,fee DECIMAL(10,2),created_at timestamp,type smallint,remark string ,key i_cid(cid)
);

tidb配置cdc，写入到kafka

1、tidb添加cdc组件
2、配置cdc任务
cat your.toml

case-sensitive = true
enable-old-value = true
[filter]
rules = ['db.tb_1']

3、启动任务

tiup ctl:v5.3.0 cdc changefeed create --pd=http://pd-ip:2379 \
--sink-uri="kafka://kafka-ip:9092/your-topic?kafka-version=1.1.1&partition-num=1&max-message-bytes=67108864&replication-factor=1&protocol=canal-json" --changefeed-id="my" --sort-engine="unified" \
--start-ts=453870757254529193 --config your.toml

protocol=canal-json 使用这个格式
–start-ts这个通过一次导出查看，cat db/metadata

dumpling -u root -p pwd -h tidb-ip -P 3306  -F 1GiB --compress gzip -t 2 -o db -B db -T db.tb --where "cid=123456"

4、更新一条数据，看看kafka是不是有了

创建SQL作业，从kafka消费后入mysql

CREATE TABLE tb_1 (id bigint,cid bigint,gid bigint,fee DECIMAL(10,2),create_time timestamp,type smallint,remark string,PRIMARY KEY (`id`) NOT ENFORCED
) WITH (-- 定义 Kafka 参数'connector' = 'kafka','topic' = 'your-topic','scan.startup.mode' = 'latest-offset', 'properties.bootstrap.servers' = 'ip:9092','properties.group.id' = 'your-group','format' = 'canal-json', -- tidb 支持该方式'canal-json.ignore-parse-errors' = 'false'
);CREATE TABLE kh_tb_1 (id bigint,cid bigint,gid bigint,fee DECIMAL(10,2),create_time timestamp,type smallint,remark string,PRIMARY KEY (`id`) NOT ENFORCED
) WITH ('connector' = 'jdbc','url' = 'jdbc:mysql://xxxxxx:3306/db?rewriteBatchedStatements=true&serverTimezone=Asia/Shanghai','table-name' = 'tb_1','username' = 'user','password' = 'pwd','sink.buffer-flush.max-rows' = '5000','sink.buffer-flush.interval' = '2s','sink.max-retries' = '10'
);insert into kh_tb_1 select * from tb_1 where cid=xxxxxxx;

最后启动作业任务即可。