flink实时消费kafka中oracle的DML数据写入mysql

1.需要环境
zookeeper，小编安装环境为zookeeper-3.4.10
kakfa，小编安装环境为kafka_2.13-2.8.0
kafka-connect-oracle，此为kafka-connect的oracle实时同步开源工程，源码地址：

https://github.com/erdemcer/kafka-connect-oracle

confluent，小编安装环境为confluent-5.3.1，下载链接：

https://www.confluent.io/hub/confluentinc/kafka-connect-jdbc

2.搭建说明
多种方式可以实现实时监听数据库DDL操作，小编选择通过如上三个组件，zookeeper、kafka、confluent搭建，另也可通过debezium的方式去搭建环境，感兴趣的可以再详细了解，confluent操作如下。

*2.1、*必须开启oracle归档日志。

*2.2、*基于oracle logminer的解析方式，对源库有一定影响，影响在5%以内。

*2.3、*上传jar包到/xxx/xx/xx/confluent/share/java/kafka-connect-jdbc：kafka-connect-oracle-1.0.jar，ojdbc7.jar，jsqlparser-1.2.jar，其中kafka-connect-oracle-1.0.jar为第一步kafka-connect-oracle源码jar包

*2.4、*cd /xxxx/xxxxx/confluent/etc/kafka-connect-jdbc 增加OracleSourceConnector.properties，内容如下:

name=oracle-logminer-connector
connector.class=com.ecer.kafka.connect.oracle.OracleSourceConnector
db.name.alias=mscdw
tasks.max=1
topic=oracletokafka
db.name=orcl
db.hostname=ip
db.port=port
db.user=user
db.user.password=password
db.fetch.size=1
table.whitelist=MSCDW.*,MSCDW.CONFIG
parse.dml.data=true
reset.offset=false
start.scn=
multitenant=false
table.blacklist=

*2.5、*cd /xxxx/xxxxx/confluent/etc/schema-registry， 修改schema-registry下connect-avro-standalone.properties文件，内容如下

internal.key.converter=org.apache.kafka.connect.json.JsonConverter
internal.value.converter=org.apache.kafka.connect.json.JsonConverter
internal.key.converter.schemas.enable=false
internal.value.converter.schemas.enable=false

*2.6、*启动，按顺序执行

启动zookeeper
sh zkServer.sh start

停止zookeeper
sh zkServer.sh stop

启动kafka
/home/kafka/kafka_2.13-2.8.0/bin/kafka-server-start.sh /home/kafka/kafka_2.13-2.8.0/config/server.properties &

关闭kafka
/home/kafka/kafka_2.13-2.8.0/bin/kafka-server-stop.sh /home/kafka/kafka_2.13-2.8.0/config/server.properties &

启动zookeeper和kafka后，进入confluent下，通过如下命令监听oracle数据ddl
./bin/connect-standalone ./etc/schema-registry/connect-avro-standalone.properties ./etc/kafka-connect-jdbc/OracleSourceConnector.properties

通过如下命令查看topic为oracletokafka的数据变化状态
./kafka-console-consumer.sh --bootstrap-server 172.16.50.22:9092 --topic oracletokafka --from-beginning

3.结果演示
如图所示，可以捕捉到DML操作类型OPERATION：insert、update、delete，对于update而言，data为修改后数据，before为修改前数据。
4.引言
当拿到kafka监听oralce的DML语句时，可以搭配flink实现数据的sink，将DML语句解析实时同步计算到任意数据库，如果是同数据源之间的数据同步，小编建议直接做主从，如果是不同数据源的同步，那通过以上方式再搭配flink确实很高效。

5.flink的sink
网盘链接，有对应的组件环境以及个人手册记录：

https://pan.baidu.com/s/15rM84nK0bRcHKYO28KorBg

提取码：gaq0
5.1、首先，小编flink版本使用1.13.1
5.2、其次，贴出一些需要用到的jar

<properties>
		<java.version>1.8</java.version>
		<fastjson.version>1.2.75</fastjson.version>
		<druid.version>1.2.5</druid.version>
		<flink.version>1.13.1</flink.version>
		<scala.binary.version>2.12</scala.binary.version>
		<HikariCP.version>3.2.0</HikariCP.version>
		<kafka.version>2.8.0</kafka.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.apache.flink</groupId>
			<artifactId>flink-java</artifactId>
			<version>${flink.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.flink</groupId>
			<artifactId>flink-streaming-java_2.11</artifactId>
			<version>${flink.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.flink</groupId>
			<artifactId>flink-scala_${scala.binary.version}</artifactId>
			<version>${flink.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.flink</groupId>
			<artifactId>flink-table-api-java-bridge_${scala.binary.version}</artifactId>
			<version>${flink.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.flink</groupId>
			<artifactId>flink-table-planner_${scala.binary.version}</artifactId>
			<version>${flink.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.flink</groupId>
			<artifactId>flink-streaming-scala_${scala.binary.version}</artifactId>
			<version>${flink.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.flink</groupId>
			<artifactId>flink-table-common</artifactId>
			<version>${flink.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.flink</groupId>
			<artifactId>flink-clients_${scala.binary.version}</artifactId>
			<version>${flink.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.flink</groupId>
			<artifactId>flink-table-planner-blink_2.12</artifactId>
			<version>${flink.version}</version>
		</dependency>
		<dependency>
			<groupId>com.flink.json</groupId>
			<artifactId>flink-json</artifactId>
			<version>1.9.0</version>
		</dependency>
		<dependency>
			<groupId>org.apache.flink</groupId>
			<artifactId>flink-connector-kafka_2.11</artifactId>
			<version>${flink.version}</version>
		</dependency>
		<dependency>
			<groupId>com.apache.flink</groupId>
			<artifactId>flink-sql-connector-kafka</artifactId>
			<version>2.11-1.9.0</version>
		</dependency>
		<dependency>
			<groupId>org.apache.flink</groupId>
			<artifactId>flink-runtime_2.11</artifactId>
			<version>${flink.version}**</version>
		</dependency>
		<dependency>
			<groupId>org.apache.flink</groupId>
			<artifactId>flink-connector-kafka_2.11</artifactId>
			<version>${flink.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.flink</groupId>
			<artifactId>flink-sql-connector-kafka_2.11</artifactId>
			<version>${flink.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.flink</groupId>
			<artifactId>flink-connector-jdbc_2.11</artifactId>
			<version>${flink.version}**</version>
		</dependency>
		<dependency>
			<groupId>com.zaxxer</groupId>
			<artifactId>HikariCP</artifactId>
			<version>${HikariCP.version}</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.47</version>
		</dependency>
		<dependency>
			<groupId>org.apache.kafka</groupId>
			<artifactId>kafka_2.13</artifactId>
			<version>${kafka.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.kafka</groupId>
			<artifactId>kafka-clients</artifactId>
			<version>${kafka.version}</version>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>${fastjson.version}</version>
		</dependency>
		<dependency>
			<groupId>com.google.code.gson</groupId>
			<artifactId>gson</artifactId>
			<version>2.8.2</version>
		</dependency>
	</dependencies>

5.3、贴出小编使用的测试表
oracle：mysql：
5.4、贴出flink-sql：
sink：

CREATE TABLE sinkMysqlConfig 
(
    ID  VARCHAR,
    CRON VARCHAR
) WITH (
    'connector.type' = 'jdbc', 
    'connector.url' = 'jdbc:mysql://xxx:xxx/xxx', 
    'connector.table' = 'xxx',
    'connector.username' = 'xxx',
    'connector.password' = 'xxx', 
    'connector.write.flush.max-rows' = '1' 
);

source：

CREATE TABLE sourceOracleConfig (
    payload ROW(SCN string,SEG_OWNER string,TABLE_NAME string,data ROW(ID string,CRON string))
) WITH (
    'connector.type' = 'kafka',
    'connector.version' = 'universal',      
    'connector.topic' = 'xxx',          
    'connector.startup-mode' = 'earliest-offset',       
    'connector.properties.group.id' = 'xxx',
    'connector.properties.zookeeper.connect' = 'xxx:2181',
    'connector.properties.bootstrap.servers' = 'xxx:9092',
    'format.type' = 'json',
    'format.json-schema' =      --json format
    '{
        "type": "object",
        "properties": 
        {
           "payload":
           {type: "object",
                   "properties" : 
                   {
						"SCN" 		 : {type:"string"},
						"SEG_OWNER"  : {type:"string"},
						"TABLE_NAME" : {type:"string"},
						"data": 
						{type : "object", 
                               "properties": 
                               {
                               	"ID"   : {type : "string"},
                                "CRON" : {type : "string"}
                               }
                   		}
           		   }
           }
        }
    }'
);

5.5、flinksqlclient演示，可跳过此步骤

5.6、贴出代码流程

public static void main(String[] args) throws Exception {
		
		StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
		env.setParallelism(1);
		
		EnvironmentSettings settings = EnvironmentSettings.newInstance()
				.useBlinkPlanner()
				.inStreamingMode()
				.build();
		
		StreamTableEnvironment  tableEnv = StreamTableEnvironment.create(env,settings);

		String sourceKafkaTable = String.format("CREATE TABLE sourceOracleConfig (\n" +
				"    payload ROW(SCN string,SEG_OWNER string,TABLE_NAME string,data ROW(ID string,CRON string))\n" +
				") WITH (\n" +
				"    'connector.type' = 'kafka',\n" +
				"    'connector.version' = 'universal',      \n" +
				"    'connector.topic' = 'xxx',          \n" +
				"    'connector.startup-mode' = 'earliest-offset',       \n" +
				"    'connector.properties.group.id' = 'xxx',\n" +
				"    'connector.properties.zookeeper.connect' = 'ip:2181',\n" +
				"    'connector.properties.bootstrap.servers' = 'ip:9092',\n" +
				"    'format.type' = 'json',\n" +
				"    'format.json-schema' =      --json format\n" +
				"    '{\n" +
				"        \"type\": \"object\",\n" +
				"        \"properties\": \n" +
				"        {\n" +
				"           \"payload\":\n" +
				"           {type: \"object\",\n" +
				"                   \"properties\" : \n" +
				"                   {\n" +
				"\t\t\t\t\t\t\"SCN\" \t\t : {type:\"string\"},\n" +
				"\t\t\t\t\t\t\"SEG_OWNER\"  : {type:\"string\"},\n" +
				"\t\t\t\t\t\t\"TABLE_NAME\" : {type:\"string\"},\n" +
				"\t\t\t\t\t\t\"data\": \n" +
				"\t\t\t\t\t\t{type : \"object\", \n" +
				"                               \"properties\": \n" +
				"                               {\n" +
				"                               \t\"ID\"   : {type : \"string\"},\n" +
				"                                \"CRON\" : {type : \"string\"}\n" +
				"                               }\n" +
				"                   \t\t}\n" +
				"           \t\t   }\n" +
				"           }\n" +
				"        }\n" +
				"    }'\n" +
				")");

		String sinkMysqlTable = String.format(
		"CREATE TABLE sinkMysqlConfig \n" +
				"(\n" +
				"    ID  VARCHAR,\n" +
				"    CRON VARCHAR\n" +
				") WITH (\n" +
				"    'connector.type' = 'jdbc', \n" +
				"    'connector.url' = 'jdbc:mysql://ip:port/xxx', \n" +
				"    'connector.table' = 'xxx',\n" +
				"    'connector.username' = 'xxx',\n" +
				"    'connector.password' = 'xxx', \n" +
				"    'connector.write.flush.max-rows' = '1' \n" +
				")");

		System.out.println(sourceKafkaTable+"\n"+sinkMysqlTable);

		tableEnv.executeSql(sourceKafkaTable);
		tableEnv.executeSql(sinkMysqlTable);

		String sql = "insert into sinkMysqlConfig select payload.data.ID,payload.data.CRON from sourceOracleConfig";

        tableEnv.executeSql(sql);
		env.execute("FlinkSourceOracleSyncKafkaDDLSinkMysqlJob");

5.7、结果演示
当在oracle中新增数据后，发现mysql中对应表数据同步过来，自此oracle-mysql的数据同步测试demo验证完毕。最后打包将任务提交在flink web中。