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# Introduction
This module is the mysql registry plugin module, this plugin will use mysql as the registry center.
# How to use
If you want to set the registry center as mysql, you need to do the below two steps:
1. Initialize the mysql table
You can directly execute the sql script `src/main/resources/mysql_registry_init.sql` .
2. Open the config
You need to set the registry properties in master/worker/api's appplication.yml
```yaml
registry:
type: mysql
term-refresh-interval: 2s
term-expire-times: 3
hikari-config:
driver-class-name: com.mysql.cj.jdbc.Driver
jdbc-url: jdbc:mysql://127.0.0.1:3306/dolphinscheduler
username: root
password: root
maximum-pool-size: 5
connection-timeout: 9000
idle-timeout: 600000
```
After do this two steps, you can start your DolphinScheduler cluster, your cluster will use mysql as registry center to
store server metadata.
NOTE: You need to add `mysql-connector-java.jar` into DS classpath, since this plugin will not bundle this driver in distribution.
You can get the detail about < a href = "https://dolphinscheduler.apache.org/en-us/docs/3.1.2/guide/installation/pseudo-cluster" > Initialize the Database< / a >
