Spring Scheduler code within an App with multiple instances with multiple JVMs

Question

I have a spring scheduler task configured with either of fixedDelay or cron, and have multiple instances of this app running on multiple JVMs.

The default behavior is all the instances are executing the scheduler task.

Is there a way by which we can control this behavior so that only one instance will execute the scheduler task and others don't.

Please let me know if you know any approaches.

Thank you

Answer 1

We had similar problem. We fixed it like this:

1. Removed all @Scheduled beans from our Spring Boot services.
2. Created AWS Lambda function scheduled with desired schedule.
3. Lambda function hits our top level domain with scheduling request.
4. Load balancer forwards this request to one of the service instances.

This way we are sure that scheduled task is executed only once across the cluster of our services.