Flink CDC MySQL同步MySQL错误记录

 

0、相关Jar包

Central Repository: org/apache/flink/flink-connector-jdbc/3.1.1-1.16

Central Repository: com/ververica/flink-sql-connector-mysql-cdc/3.0.0

或者从mvnrepository.com下载
https://mvnrepository.com/artifact/com.ververica/flink-sql-connector-mysql-cdc

https://mvnrepository.com/artifact/org.apache.flink/flink-connector-jdbc

1、启动 Flink SQL

[appuser@whtpjfscpt01 flink-1.17.1]$ bin/sql-client.sh

2、新建源表

问题1：Encountered “(”
处理方法：去掉int(11)，改为int

Flink SQL> CREATE TABLE `t_user` (
>   `uid` int(11) NOT NULL AUTO_INCREMENT COMMENT 'user id',
>   `did` int(11) DEFAULT NULL COMMENT 'dept id',
>   `username` varchar(14) DEFAULT NULL,
>   `add_time` datetime DEFAULT NULL,
>   PRIMARY KEY (`uid`) NOT ENFORCED
> ) WITH (
>       'connector' = 'mysql-cdc',
>       'hostname' = '192.25.34.2',
>       'port' = '3306',
>       'username' = '*******',
>       'password' = '*******',
>       'database-name' = 'test',
>       'table-name' = 't_user'
> );
[ERROR] Could not execute SQL statement. Reason:
org.apache.flink.sql.parser.impl.ParseException: Encountered "(" at line 2, column 12.
Was expecting one of:
    "CONSTRAINT" ...
    "NOT" ...
    "NULL" ...
    "PRIMARY" ...
    "UNIQUE" ...
    "COMMENT" ...
    "METADATA" ...
    ")" ...
    "," ...
    "MULTISET" ...
    "ARRAY" ...
 
Flink SQL> 

问题2：Encountered “AUTO_INCREMENT”
处理方法：删除AUTO_INCREMENT

Flink SQL> CREATE TABLE `t_user` (
>   `uid` int NOT NULL AUTO_INCREMENT COMMENT 'user id',
>   `did` int DEFAULT NULL COMMENT 'dept id',
>   `username` varchar(14) DEFAULT NULL,
>   `add_time` datetime DEFAULT NULL,
>   PRIMARY KEY (`uid`) NOT ENFORCED
> ) WITH (
>       'connector' = 'mysql-cdc',
>       'hostname' = '192.25.34.2',
>       'port' = '3306',
>       'username' = '*******',
>       'password' = '*******',
>       'database-name' = 'test',
>       'table-name' = 't_user'
> );
[ERROR] Could not execute SQL statement. Reason:
org.apache.flink.sql.parser.impl.ParseException: Encountered "AUTO_INCREMENT" at line 2, column 22.
Was expecting one of:
    "CONSTRAINT" ...
    "PRIMARY" ...
    "UNIQUE" ...
    "COMMENT" ...
    "METADATA" ...
    ")" ...
    "," ...
    "MULTISET" ...
    "ARRAY" ...
 
Flink SQL> 

问题3：Encountered “DEFAULT”
处理方法：删去DEFAULT

Flink SQL> CREATE TABLE `t_user` (
>   `uid` int NOT NULL COMMENT 'user id',
>   `did` int DEFAULT NULL COMMENT 'dept id',
>   `username` varchar(14) DEFAULT NULL,
>   `add_time` datetime DEFAULT NULL,
>   PRIMARY KEY (`uid`) NOT ENFORCED
> ) WITH (
>       'connector' = 'mysql-cdc',
>       'hostname' = '192.25.34.2',
>       'port' = '3306',
>       'username' = '*******',
>       'password' = '*******',
>       'database-name' = 'test',
>       'table-name' = 't_user'
> );
[ERROR] Could not execute SQL statement. Reason:
org.apache.flink.sql.parser.impl.ParseException: Encountered "DEFAULT" at line 3, column 13.
Was expecting one of:
    "CONSTRAINT" ...
    "NOT" ...
    "NULL" ...
    "PRIMARY" ...
    "UNIQUE" ...
    "COMMENT" ...
    "METADATA" ...
    ")" ...
    "," ...
    "MULTISET" ...
    "ARRAY" ...
 
Flink SQL> 

问题4：Unknown identifier ‘datetime’
处理方法：改用 TIMESTAMP(3)

Flink SQL> CREATE TABLE `t_user` (
>   `uid` int NOT NULL COMMENT 'user id',
>   `did` int COMMENT 'dept id',
>   `username` varchar(14) ,
>   `add_time` datetime ,
>   PRIMARY KEY (`uid`) NOT ENFORCED
> ) WITH (
>       'connector' = 'mysql-cdc',
>       'hostname' = '192.25.34.2',
>       'port' = '3306',
>       'username' = '*******',
>       'password' = '*******',
>       'database-name' = 'test',
>       'table-name' = 't_user'
> );
[ERROR] Could not execute SQL statement. Reason:
org.apache.calcite.sql.validate.SqlValidatorException: Unknown identifier 'datetime'
 
Flink SQL> 

创建成功：

Flink SQL> CREATE TABLE `t_user` (
>   `uid` int NOT NULL COMMENT 'user id',
>   `did` int COMMENT 'dept id',
>   `username` varchar(14) ,
>   `add_time` TIMESTAMP(3),
>   PRIMARY KEY (`uid`) NOT ENFORCED
> ) WITH (
>       'connector' = 'mysql-cdc',
>       'hostname' = '192.25.34.2',
>       'port' = '3306',
>       'username' = '*******',
>       'password' = '*******',
>       'database-name' = 'test',
>       'table-name' = 't_user'
> );
[INFO] Execute statement succeed.
 
Flink SQL> 

3、创建目标表

Flink SQL> CREATE TABLE `ods_t_user` (
>     `uid` int NOT NULL COMMENT 'user id',
>     `did` int COMMENT 'dept id',
>     `username` varchar(14) ,
>     `add_time` TIMESTAMP(3),
>     PRIMARY KEY (`uid`) NOT ENFORCED
>  ) WITH (
>      'connector' = 'jdbc',
>      'url' = 'jdbc:mysql://192.25.34.2:3306/demo?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC',
>      'driver' = 'com.mysql.cj.jdbc.Driver',
>      'username' = '*******',
>      'password' = '*******',
>      'table-name' = 'ods_t_user'
> );

4、将源表加载到目标表

错误1：Connector ‘mysql-cdc’ can only be used as a source. It cannot be used as a sink.

Flink SQL> insert into t_user select * from ods_t_user;
[ERROR] Could not execute SQL statement. Reason:
org.apache.flink.table.api.ValidationException: Connector 'mysql-cdc' can only be used as a source. It cannot be used as a sink.
 
Flink SQL> 

原因：方向搞反了，插入表应该是目标表

Flink SQL> insert into ods_t_user select * from t_user;
[ERROR] Could not execute SQL statement. Reason:
java.io.StreamCorruptedException: unexpected block data
 
Flink SQL> 

错误2：unexpected block data
解决办法：
（1）更新jar包如下

[appuser@whtpjfscpt01 flink-1.17.1]$ ll lib/
total 223320
-rw-r--r-- 1 appuser appuser    196491 May 19 18:56 flink-cep-1.17.1.jar
-rw-r--r-- 1 appuser appuser    542620 May 19 18:59 flink-connector-files-1.17.1.jar
-rw-r--r-- 1 appuser appuser    266420 Sep 25 14:21 flink-connector-jdbc-3.1.1-1.17.jar
-rw-r--r-- 1 appuser appuser    345711 Sep 25 15:45 flink-connector-mysql-cdc-2.4.1.jar
-rw-r--r-- 1 appuser appuser    102472 May 19 19:02 flink-csv-1.17.1.jar
-rw-r--r-- 1 appuser appuser 135975541 May 19 19:13 flink-dist-1.17.1.jar
-rw-r--r-- 1 appuser appuser   8452171 Sep 19 10:20 flink-doris-connector-1.17-1.4.0.jar
-rw-r--r-- 1 appuser appuser    180248 May 19 19:02 flink-json-1.17.1.jar
-rw-r--r-- 1 appuser appuser  21043319 May 19 19:12 flink-scala_2.12-1.17.1.jar
-rw-r--r-- 1 appuser appuser  15407424 May 19 19:13 flink-table-api-java-uber-1.17.1.jar
-rw-r--r-- 1 appuser appuser  38191226 May 19 19:08 flink-table-planner-loader-1.17.1.jar
-rw-r--r-- 1 appuser appuser   3146210 May 19 18:56 flink-table-runtime-1.17.1.jar
-rw-r--r-- 1 appuser appuser    208006 May 17 18:07 log4j-1.2-api-2.17.1.jar
-rw-r--r-- 1 appuser appuser    301872 May 17 18:07 log4j-api-2.17.1.jar
-rw-r--r-- 1 appuser appuser   1790452 May 17 18:07 log4j-core-2.17.1.jar
-rw-r--r-- 1 appuser appuser     24279 May 17 18:07 log4j-slf4j-impl-2.17.1.jar
-rw-r--r-- 1 appuser appuser   2462364 Sep 19 11:30 mysql-connector-java-8.0.26.jar
[appuser@whtpjfscpt01 flink-1.17.1]$

（2）重启flink

[appuser@whtpjfscpt01 flink-1.17.1]$ bin/stop-cluster.sh 
Stopping taskexecutor daemon (pid: 41993) on host whtpjfscpt01.
Stopping standalonesession daemon (pid: 41597) on host whtpjfscpt01.
[appuser@whtpjfscpt01 flink-1.17.1]$ bin/start-cluster.sh 
Starting cluster.
Starting standalonesession daemon on host whtpjfscpt01.
Starting taskexecutor daemon on host whtpjfscpt01.
[appuser@whtpjfscpt01 flink-1.17.1]$ bin/sql-client.sh

（3）重新执行

Flink SQL> SET execution.checkpointing.interval = 3s;
[INFO] Execute statement succeed.
 
Flink SQL> CREATE TABLE `t_user` (
>     `uid` int NOT NULL COMMENT 'user id',
>     `did` int COMMENT 'dept id',
>     `username` varchar(14) ,
>     `add_time` TIMESTAMP(3),
>     PRIMARY KEY (`uid`) NOT ENFORCED
> ) WITH (
>       'connector' = 'mysql-cdc',
>       'hostname' = '192.25.34.2',
>       'port' = '3306',
>       'username' = '*******',
>       'password' = '*******',
>       'database-name' = 'test',
>       'table-name' = 't_user'
>  );
[INFO] Execute statement succeed.
 
Flink SQL> CREATE TABLE `ods_t_user` (
>     `uid` int NOT NULL COMMENT 'user id',
>     `did` int COMMENT 'dept id',
>     `username` varchar(14) ,
>     `add_time` TIMESTAMP(3),
>     PRIMARY KEY (`uid`) NOT ENFORCED
>  ) WITH (
>      'connector' = 'jdbc',
>      'url' = 'jdbc:mysql://192.25.34.2:3306/demo?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC',
>      'driver' = 'com.mysql.cj.jdbc.Driver',
>      'username' = '*******',
>      'password' = '*******',
>      'table-name' = 'ods_t_user'
> );
[INFO] Execute statement succeed.
 
Flink SQL>

 

（4）成功执行

Flink SQL> insert into ods_t_user select * from t_user;
[INFO] Submitting SQL update statement to the cluster...
[INFO] SQL update statement has been successfully submitted to the cluster:
Job ID: c2e69d061f3777c031b0acb4ec03d13a

错误3：无目标表

 CREATE TABLE demo.ods_t_user (
  `uid` int(11) NOT NULL AUTO_INCREMENT COMMENT 'user id',
  `did` int(11) DEFAULT NULL COMMENT 'dept id',
  `username` varchar(14) DEFAULT NULL,
   `add_time` datetime DEFAULT NULL,
  PRIMARY KEY (`uid`) 
) 

源表添加新纪录

INSERT INTO test.t_user(did,username)values('3','test'); 

目标表自动同步数据