title: <Apache Airflow> DAGRun doesn't stop when the job is finished
body: <p>I use Airflow 1.10.9 with the <strong>executor</strong> of <strong>LocalExecutor</strong>. I have tasks that take 1 hour to complete. But after the task completed. DAGRun doesn't stop. I can only terminate it manually.</p>
  <p><a href="https://i.stack.imgur.com/ZMqC9.png" rel="nofollow noreferrer">dagrun</a>
  <a href="https://i.stack.imgur.com/M3ejz.png" rel="nofollow noreferrer">task_instance</a></p>
  <p>Someone had the same problem <a href="https://stackoverflow.com/questions/49612150/airflow-simple-dag-with-one-task-never-finishes"> here</a></p>