To limit the number of tasks that concurrently execute in a job to 3, you can use the max_concurrent_runs parameter in your job configuration. This parameter allows you to specify the maximum number of concurrent runs for a job, ensuring that no more than the specified number of tasks run at the same time.

When creating or updating your job, set the max_concurrent_runs parameter to 3. This will limit the number of concurrent tasks to 3.

The max_concurrent_runs parameter will handle the concurrency limit regardless of the cluster size.