Flink CDC 於 2021 年 11 月 15 日釋出了最新版本 2.1，該版本透過引入內建 Debezium 元件，增加了對 Oracle 的支援。
Flink下載地址
https://flink.apache.org/downloads/
其他必需的jar包（cdc、jdbc、mysq和oracle等驅動包）
下載Flink後，直接解壓到指定目錄下即可；
tar zxvf flink-1.20.0-bin-scala_2.12.tgz
將所有必須的jar包放在lib目錄下,我這邊的目錄為/u01/flink-1.20.0/lib；
啟動flink：
[root@gcv-b-test-gmes-oracle bin]# /u01/flink-1.20.0/bin/start-cluster.sh Starting cluster. Starting standalonesession daemon on host gcv-b-test-gmes-oracle. Starting taskexecutor daemon on host gcv-b-test-gmes-oracle.
如果需要web登入檢視flink，需要修改配置檔案（/u01/flink-1.20.0/conf/config.yaml）
address: 10.240.12.219 bind-address: 0.0.0.0
登入web介面：
配置Oracle：
必須開啟歸檔（步驟查資料）；
測試使用者及表 create user flink identified by "123456"; grant connect ,resource to flink; create table flink.user_info(id number primary key,name varchar2(100),age number); ##開啟資料庫級別補充日誌 ALTER DATABASE ADD SUPPLEMENTAL LOG DATA; ##開啟該表的列附加日誌 ALTER TABLE flink.user_info ADD SUPPLEMENTAL LOG DATA (ALL) COLUMNS; 建立用於cdc解析的表空間 CREATE TABLESPACE logminer_tbs DATAFILE '/u01/oradata/sharedb/logminer_tbs.dbf' SIZE 25M REUSE AUTOEXTEND ON MAXSIZE UNLIMITED; 建立flinkuser複製使用者 CREATE USER flinkuser IDENTIFIED BY flinkpw DEFAULT TABLESPACE LOGMINER_TBS QUOTA UNLIMITED ON LOGMINER_TBS; GRANT CREATE SESSION TO flinkuser; GRANT SET CONTAINER TO flinkuser; GRANT SELECT ON V_$DATABASE to flinkuser; GRANT FLASHBACK ANY TABLE TO flinkuser; GRANT SELECT ANY TABLE TO flinkuser; GRANT SELECT_CATALOG_ROLE TO flinkuser; GRANT EXECUTE_CATALOG_ROLE TO flinkuser; GRANT SELECT ANY TRANSACTION TO flinkuser; GRANT LOGMINING TO flinkuser; GRANT ANALYZE ANY TO flinkuser; GRANT CREATE TABLE TO flinkuser; -- need not to execute if set scan.incremental.snapshot.enabled=true(default) GRANT LOCK ANY TABLE TO flinkuser; GRANT ALTER ANY TABLE TO flinkuser; GRANT CREATE SEQUENCE TO flinkuser; GRANT EXECUTE ON DBMS_LOGMNR TO flinkuser; GRANT EXECUTE ON DBMS_LOGMNR_D TO flinkuser; GRANT SELECT ON V_$LOG TO flinkuser; GRANT SELECT ON V_$LOG_HISTORY TO flinkuser; GRANT SELECT ON V_$LOGMNR_LOGS TO flinkuser; GRANT SELECT ON V_$LOGMNR_CONTENTS TO flinkuser; GRANT SELECT ON V_$LOGMNR_PARAMETERS TO flinkuser; GRANT SELECT ON V_$LOGFILE TO flinkuser; GRANT SELECT ON V_$ARCHIVED_LOG TO flinkuser; GRANT SELECT ON V_$ARCHIVE_DEST_STATUS TO flinkuser;
啟動sql-client（SQL 客戶端 的目的是提供一種簡單的方式來編寫、除錯和提交表程式到 Flink 叢集上，而無需寫一行 Java 或 Scala 程式碼。SQL 客戶端命令列介面（CLI） 能夠在命令列中檢索和視覺化分散式應用中實時產生的結果）
我的理解就是幫你智慧生成java程式碼，不需要自己寫程式碼。
[root@gcv-b-test-gmes-oracle conf]# /u01/flink-1.20.0/bin/sql-client.sh
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______ _ _ _ _____ ____ _ _____ _ _ _ BETA
| ____| (_) | | / ____|/ __ \| | / ____| (_) | |
| |__ | |_ _ __ | | __ | (___ | | | | | | | | |_ ___ _ __ | |_
| __| | | | '_ \| |/ / \___ \| | | | | | | | | |/ _ \ '_ \| __|
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|_| |_|_|_| |_|_|\_\ |_____/ \___\_\______| \_____|_|_|\___|_| |_|\__|
Welcome! Enter 'HELP;' to list all available commands. 'QUIT;' to exit.
Command history file path: /root/.flink-sql-history
Flink SQL>
配置Oracle聯結器：
CREATE TABLE user_info (
ID INT NOT NULL,
NAME STRING,
AGE int,
PRIMARY KEY(ID) NOT ENFORCED
) WITH (
'connector' = 'oracle-cdc',
'hostname' = '10.240.12.219',
'port' = '1521',
'username' = 'flinkuser',
'password' = 'flinkpw',
'database-name' = 'sharedb',
'schema-name' = 'FLINK',
'table-name' = 'USER_INFO',
'debezium.log.mining.strategy' = 'online_catalog',
'debezium.log.mining.continuous.mine' = 'true'
);
##這裡有個坑，欄位必須大寫啊（因為oracle預設都是大寫，這裡是嚴格區分大小寫的）
##如果大小寫不一致，會識別不到欄位。查詢的時候報錯如下：
##org.apache.flink.table.api.TableException: Column 'id' is NOT NULL,
##however, a null value is being written into it.）
檢視資料：
Flink SQL> select * from user_info; [INFO] Result retrieval cancelled.
mysql資料庫同步的表：
create database flink; CREATE TABLE `user_info` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `name` varchar(100) NOT NULL, `age` bigint(20) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8mb4;
sql-client配置mysql：
CREATE TABLE user_info_mysql (
id INT NOT NULL,
name STRING,
age int,
PRIMARY KEY(id) NOT ENFORCED
) WITH (
'connector' = 'jdbc',
'url' = 'jdbc:mysql://10.251.93.3:3306/flink',
'driver' = 'com.mysql.cj.jdbc.Driver',
'username' = 'xxxx',
'password' = 'xxxx',
'table-name' = 'user_info');
Insert into user_info_mysql select * from user_info;
驗證：
oracle：插入資料
mysql驗證：
感覺上手難度不大，有些jar包容易漏，導致異常。
參考文件：https://nightlies.apache.org/flink/flink-cdc-docs-release-3.0/zh/docs/connectors/flink-sources/tutorials/oracle-tutorial/
https://nightlies.apache.org/flink/flink-cdc-docs-release-3.0/zh/docs/connectors/flink-sources/oracle-cdc/