Creating a MySQL Link

Prerequisites

• You have obtained the IP address, port, database name, username, and password for connecting to the MySQL database. In addition, the user must have the read and write permissions on the MySQL database.
• The on-premises MySQL database can be accessed through the public network. If the MySQL database is deployed on an on-premises data center or a third-party cloud, ensure that an IP address that can be accessed from the public network has been configured for the MySQL database, or the VPN or Direct Connect between the on-premises data center and the cloud service platform has been established.
• You have created a CDM cluster.

Creating a MySQL Link

1. Access the CDM console, choose Cluster Management in the navigation pane, locate the target cluster, and choose Job Management > Link Management > Driver Management. The Driver Management page is displayed.
2. On the Driver Management page, click the document link in the Recommended Version column of the MySQL driver and obtain the driver file as instructed.
3. On the Driver Management page, upload the MySQL driver using either of the following methods:

   Click Upload in the Operation column and select a local driver.

   Alternatively, click Copy from SFTP in the Operation column and configure the SFTP Link name and Driver File Path.

4. On the Cluster Management page, click Job Management of the cluster and choose Links > Create Link to enter the page for selecting the connector.
   Figure 1 Selecting a connector type
   

5. Select MySQL and click Next to configure parameters for the MySQL link.

   Table 1 MySQL link parameters

   Parameter	Description	Example Value
   Name	Enter a unique link name.	mysqllink
   Database Server	IP address or domain name of the MySQL database	192.168.1.110
   Port	MySQL database port	3306
   Database Name	Name of the MySQL database	sqoop
   Username	User who has the read, write, and delete permissions on the MySQL database	admin
   Password	Password of the user	-
   Use Local API	Whether to use the local API of the database for acceleration. (The system attempts to enable the local_infile system variable of the MySQL database.)	Yes
   Use Agent	The agent function will be unavailable soon and does not need to be configured.	-
   local_infile Character Set	When using local_infile to import data to MySQL, you can configure the encoding format.	utf8
   Driver Version	A driver version that adapts to MySQL	-
   Agent	The agent function will be unavailable soon and does not need to be configured.	-
   Fetch Size	Number of rows obtained by each request	1000
   Commit Size	(Optional) Displayed when you click Show Advanced Attributes. Number of records submitted each time. Set this parameter based on the destination and data size of the job. If the value is too large or too small, the job execution time may be affected.	1000
   Link Attributes	Custom attributes of the link	useCompression=true
   Reference Sign	Delimiter used to separate referenced table names or column names This parameter is left blank by default.	'
   Batch Size	Number of rows written each time. It should be less than Commit Size. When the number of rows written reaches the value of Commit Size, the rows will be committed to the database.	100

6. Click Save to return to the Links page.
   

   If an error occurs during the saving, the security settings of the MySQL database are incorrect. In this case, you need to enable the EIP of the CDM cluster to access the MySQL database.