Explanation: A task runner is an application that polls AWS Data Pipeline for tasks and then performs those tasks. You can either use Task Runner as provided by AWS Data Pipeline, or create a custom Task Runner application. Task Runner is a default implementation of a task runner that is provided by AWS Data Pipeline. When Task Runner is installed and configured, it polls AWS Data Pipeline for tasks associated with pipelines that you have activated. When a task is assigned to Task Runner, it performs that task and reports its status back to AWS Data Pipeline. If your workflow requires non-default behavior, you’ll need to implement that functionality in a custom task runner.
Reference:
http://docs.aws.amazon.com/datapipeline/latest/DeveloperGuide/dp-ho…