ashb commented on issue #4291: [AIRFLOW-1488] Add the TriggeredDagRunSensor operator URL: https://github.com/apache/airflow/pull/4291#issuecomment-512850432 A pool is not tied to any specific resource, but a way of limiting concurrency in Airflow. For example if you define a Pool with one slot: ```python dag_a = DAG('dag_a', pool="a") with dag_a: DummyOperator(task_id="a_a") DummyOperator(task_id="a_b") dag_b = DAG('dag_b', pool="a") with dag_b: DummyOperator(task_id="b_a") DummyOperator(task_id="b_b") ``` then Airflow will only run at most one of those task at the same time. Since you said "I can not start DAT_PUBLISH if there is DAG_UPDATE_PRICES in RUNNING" you could define both those dags in a pool with one slot, and they wouldn't run at the same time.
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