How to solve the issue of duplicate executions in the Quartz cluster?
To resolve the issue of quartz cluster duplicate execution, the following steps can be taken:
- Set up a cluster environment: Make sure that the configuration files of each Quartz node have the same cluster configuration parameters, including the same scheduler name and thread pool size.
- Use a database as a job store: By setting quartz’s job store to a database, you can use JDBCJobStore to ensure that all nodes share the same job data, preventing duplicate executions.
- To specify the identity of quartz nodes in a cluster environment, each node must have a unique identifier. This can be done by setting the instanceId parameter in the configuration file to ensure that each node has a distinct identifier.
- Using triggers in cluster mode: In a cluster environment, it is recommended to use triggers in cluster mode, such as setting the MisfireInstruction of CronTriggerImpl to MISFIRE_INSTRUCTION_FIRE_ONCE_NOW. This can help prevent multiple nodes from triggering the same task simultaneously.
- Prevent duplicate job registration: In a cluster environment, make sure only one node registers the same job. You can achieve this by using the withIdentity method of JobBuilder to set a unique job identifier, and then using the storeDurably method of JobDetail to make the job persistent and avoid duplication.
- Monitor cluster status: Utilize the cluster management feature provided by quartz to monitor the status of the cluster. You can access the status of each node in the cluster through the cluster management page or API, enabling timely detection and resolution of repeated execution issues.
The issue of duplicate executions in a quartz cluster can be effectively resolved by following the above steps.
