Preparing a Driver for MySQL Database Link

Scenario

As a component for batch data export, Loader can import and export data using a relational database.

Prerequisites

You have prepared service data.

Procedure

Procedure for MRS clusters earlier than 3.x:

Download the MySQL JDBC driver mysql-connector-java-5.1.21.jar from the MySQL official website. For details about how to select the MySQL JDBC driver, see the following table.

**Table 1** Version information
JDBC Driver Version	MySQL Version
Connector/J 5.1	MySQL 4.1, MySQL 5.0, MySQL 5.1, and MySQL 6.0 alpha
Connector/J 5.0	MySQL 4.1, MySQL 5.0 servers, and distributed transaction (XA)
Connector/J 3.1	MySQL 4.1, MySQL 5.0 servers, and MySQL 5.0 except distributed transaction (XA)
Connector/J 3.0	MySQL 3.x and MySQL 4.1

Upload mysql-connector-java-5.1.21.jar to the Loader installation directory on the active and standby MRS Master nodes.
- For versions earlier than MRS 3.x, upload the package to /opt/Bigdata/MRS_XXX/install/FusionInsight-Sqoop-1.99.7/FusionInsight-Sqoop-1.99.7/server/jdbc/.
  In the preceding path, XXX indicates the MRS version number. Change it based on site requirements.
Change the owner of the mysql-connector-java-5.1.21.jar package to omm:wheel.
Modify the jdbc.properties configuration file.

Change the key value of MYSQL to mysql-connector-java-5.1.21.jar, for example, MYSQL=mysql-connector-java-5.1.21.jar.
Restart the Loader service.

Procedure for MRS cluster 3.x and later versions:

Modify the permission on the JAR package of the relational database driver.

Log in to the active and standby management nodes of the Loader service, obtain the driver JAR package of the relational database, and save it to the following directory on the active and standby Loader nodes: ${BIGDATA_HOME}/FusionInsight_Porter_8.1.0.1/install/FusionInsight-Sqoop-1.99.3/FusionInsight-Sqoop-1.99.3/server/webapps/loader/WEB-INF/ext-lib

The version 8.1.0.1 is used as an example. Replace it with the actual version number.
Run the following commands as user root on the active and standby nodes of the Loader service to change the permission:

cd ${BIGDATA_HOME}/FusionInsight_Porter_8.1.0.1/install/FusionInsight-Sqoop-1.99.3/FusionInsight-Sqoop-1.99.3/server/webapps/loader/WEB-INF/ext-lib

chown omm:wheel JAR package name

chmod 600 JARpackage name
Log in to FusionInsight Manager. Choose Cluster and click the target cluster name. In the navigation pane on the left, choose Services > Loader. In the upper right corner, choose More, select Restart Service, and enter the password to restart the Loader service.