Yes, you can absolutely use different task runners with ECS workers! The ECS worker is responsible for executing your flow runs in containers on AWS ECS, while the task runner handles the execution strategy of individual tasks within your flow. These are separate concerns that work together. Here's what you need to know: 1. Supported Task Runners: - You can use DaskTaskRunner (from prefect-dask) - RayTaskRunner (from prefect-ray) - The default SequentialTaskRunner - Any custom task runner that implements the task runner interface 2. Implementation Example: Here's how you might set up a flow using Dask with an ECS deployment:

python
from prefect import flow
from prefect_dask import DaskTaskRunner

@flow(task_runner=DaskTaskRunner())
def my_flow():
    # Your flow code here
    pass

# Deploy the flow for ECS
if __name__ == "__main__":
    my_flow.from_source(
        source="<https://github.com/your-repo>",
        entrypoint="path/to/file.py:my_flow",
    ).deploy(
        name="my-flow",
        work_pool_name="my-ecs-pool",
        image="your-container-image"
    )

3. Important Considerations: - Make sure your container image includes all necessary dependencies for your chosen task runner - The task runner's resources (like Dask workers) will run within the ECS container - You may need to adjust your container's resource allocations based on your task runner's requirements 4. Best Practices: - Test your task runner configuration locally before deploying to ECS - Monitor resource usage to ensure your container has sufficient capacity for your task runner - Consider using task runner-specific configuration options to optimize performance The choice of task runner doesn't affect the ECS worker's ability to manage your flow runs - it just changes how tasks within each flow run are executed. This gives you the flexibility to choose the execution strategy that best fits your specific use case while still leveraging ECS for container orchestration. Would you like me to provide more specific details about implementing any particular task runner with ECS, or would you like to know more about the configuration options available?