Flink-CDC 抽取SQLServer问题总结

Flink-CDC 抽取SQLServer问题总结

背景

flink-cdc 抽取数据到kafka 中，使用flink-sql进行开发，相关问题总结

flink-cdc 配置SQLServer cdc参数

• 1.创建CDC 使用的角色, 并授权给其查询待采集数据数据库

 -- a.创建角色
create  role flink_role;-- b.授权给角色
grant select on SCHEMA::dbo to flink_role;-- c. 角色添加给数据库登陆用户
alter role flink_role add member 登陆用户;

• 创建文件组，用于存储CDC捕获SQLServer需要的数据文件

 -- a. 查询文件组是否存在select name AS filegroup_name ,type as filegroup_type from sys.filegroups;-- b.添加文件组
use 数据库
go 
alter database 数据库 add filegroup flinkFG
goalter database 数据库 add file 
(NAME = rytbdat1,FILENAME = 'D:\MSSQL\Data\rtybdat1.ndf',SIZE = 50MB,MAXSIZE = 500MB,FILEGROWTH = 50MB
),
(NAME = rytbdat2,FILENAME = 'D:\MSSQL\Data\rtybdat2.ndf',SIZE = 50MB,MAXSIZE = 500MB,FILEGROWTH = 50MB
) TO FILEGROUP flinkFG;--- 查看文件组
SELECT name AS '文件逻辑名称',physical_name AS '物理文件路径',(size * 8 / 1024) AS '文件大小（MB）',max_size AS '最大文件大小（MB）',growth AS '文件增长量（MB）',type_desc AS '文件类型'
FROM sys.database_files;

• 执行CDC配置，并检查是否成功

---  enable cdc  operation  for datbase 数据库 ---------  ******  m_rec_save ******  --
USE 数据库
GO
EXEC sys.sp_cdc_enable_table
@source_schema = N'数据表名所在schema',     -- Specifies the schema of the source table.
@source_name   = N'数据表名', -- Specifies the name of the table that you want to capture.
@role_name     = N'flink_role',  -- Specifies a role MyRole to which you can add users to whom you want to grant SELECT permission on the captured columns of the source table. Users in the sysadmin or db_owner role also have access to the specified change tables. Set the value of @role_name to NULL, to allow only members in the sysadmin or db_owner to have full access to captured information.
@filegroup_name = N'flinkFG',-- Specifies the filegroup where SQL Server places the change table for the captured table. The named filegroup must already exist. It is best not to locate change tables in the same filegroup that you use for source tables.
@supports_net_changes = 0
GO-- 检查数据库是否开启CDC配置USE 数据库;
GO
EXEC sys.sp_cdc_help_change_data_capture
GO-- 检查数据库下开启CDC配置的数据表
select is_cdc_enabled from sys.databases where name = '数据库';

• 工具版本

Flink 1.15
Flink-CDC 2.3.0
SQLServer 2012

问题一： flink-cdc 参数不支持增量快照

• 解决：选择合适的Flink-CDC文档，部分版本不支持增量快照

flink-cdc 2.3.0 ： schema-name未指定

• 解决，cdc参数添加 schema-name参数，指定SQLServer中数据库下面的schema名称

'connector' = 'sqlserver-cdc' ,
>         'hostname' = 'localhost' ,
>         'port' = '1433' ,
>         'username' = 'user',
>         'password' = 'password',
>         'database-name' = 'schema-name',
>         'schema-name' = 'dbo',
>        'table-name' = 'table_name'

锁超时

• Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: 已超过了锁请求超时时段。
  

• 定位思路

  • SQLServer查询阻塞进程

SELECT blocking_session_id ‘阻塞进程的ID’, wait_duration_ms ‘等待时间(毫秒)’, session_id ‘(会话ID)’ FROM sys.dm_os_waiting_tasks

![在这里插入图片描述](https://img-blog.csdnimg.cn/a561fceca1914b2b98fb51018664e50f.png)- 确定所在服务器,假设上述阻塞进程ID为56
```
sp_who2 56

• 登陆所在服务，杀死所在服务器进程

因为是sql-client提交的flink-cdc作业，所以从yarn-ui作业找到application_id,然后kill yarn app -kill applicationid