Flink CDC使用
在本地启动一个MySQL的Docker环境
docker run -it --rm --name mysql -p 3306:3306 -e MYSQL_ROOT_PASSWORD=debezium -e MYSQL_USER=mysqluser -e MYSQL_PASSWORD=mysqlpw -e TZ=Asia/Shanghai quay.io/debezium/example-mysql:2.4
创建表
create database cdc_test;
use cdc_test;
create table cdc_table (
id int primary key auto_increment,
name varchar(1000),
age int
);
在idea中新建一个Java项目
导入依赖：
<flink-cdc.version>2.4.2</flink-cdc.version>
<flink.version>1.16.3</flink.version>
<logback.version>1.2.7</logback.version>
<dependency>
<groupId>com.ververica</groupId>
<artifactId>flink-connector-mysql-cdc</artifactId>
<version>${flink-cdc.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-connector-base</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-clients</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-table-runtime</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-runtime-web</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.version}</version>
</dependency>
编写代码
public class FlinkCDCApplication {
public static void main(String[] args) throws Exception {
StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
env.setParallelism(1);
env.enableCheckpointing(60000L);
MySqlSource<String> mySqlSource = MySqlSource.<String>builder()
.hostname("localhost")
.port(3306)
.databaseList("cdc_test") // set captured database, If you need to synchronize the whole database, Please set tableList to ".*".
.tableList("cdc_test.cdc_table") // set captured table
.username("root")
.password("debezium")
.includeSchemaChanges(true)
.startupOptions(StartupOptions.latest())
.deserializer(new JsonDebeziumDeserializationSchema()) // converts SourceRecord to JSON String
.build();
env.fromSource(mySqlSource, WatermarkStrategy.noWatermarks(), "MySQL-CDC")
.print();
env.execute();
}
}
添加日志配置
<!--
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~ contributor license agreements. See the NOTICE file distributed with
~ this work for additional information regarding copyright ownership.
~ The ASF licenses this file to You under the Apache License, Version 2.0
~ (the "License"); you may not use this file except in compliance with
~ the License. You may obtain a copy of the License at
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~ http://www.apache.org/licenses/LICENSE-2.0
~
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~ See the License for the specific language governing permissions and
~ limitations under the License.
-->
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss} %p %c - %msg %n</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>Debezium标准CDC Event格式详解
{
"before": null,
"after": {
"id": 1,
"name": "xing.yu",
"age": 26,
"new_column": "dewu"
},
"source": {
"version": "1.9.7.Final",
"connector": "mysql",
"name": "mysql_binlog_source",
"ts_ms": 1702723640000,
"snapshot": "false",
"db": "cdc_test",
"sequence": null,
"table": "cdc_table",
"server_id": 223344,
"gtid": null,
"file": "mysql-bin.000003",
"pos": 2394,
"row": 0,
"thread": 39,
"query": null
},
"op": "c",
"ts_ms": 1702723640483,
"transaction": null
}
{
// 表数据更新前的值，update/delete
"before": {},
// 表数据更新后的值，create/update
"after": {},
// 元数据信息
"source": {},
// 操作类型 c/d/u
"op": "",
// 记录解析时间
"ts_ms": "",
"transaction": ""
}