XD-DENG commented on a change in pull request #4547: [AIRFLOW-2843] Add flag in
ExternalTaskSensor to check if external DAG/task exists
URL: https://github.com/apache/airflow/pull/4547#discussion_r248673851
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File path: airflow/sensors/external_task_sensor.py
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@@ -103,17 +114,37 @@ def poke(self, context, session=None):
'{self.external_task_id} on '
'{} ... '.format(serialized_dttm_filter, **locals()))
- if self.external_task_id:
- TI = TaskInstance
+ DM = DagModel
+ TI = TaskInstance
+ DR = DagRun
+ if self.check_existence:
+ dag_to_wait = session.query(DM).filter(
+ DM.dag_id == self.external_dag_id
+ ).first()
+
+ if not dag_to_wait:
+ raise AirflowException('The external DAG '
+ '{} does not
exist.'.format(self.external_dag_id))
+ else:
+ if not os.path.exists(dag_to_wait.fileloc):
+ raise AirflowException('The external DAG '
+ '{} was
deleted.'.format(self.external_dag_id))
+ if self.external_task_id:
Review comment:
If `ExternalTaskSensor` is waiting for a DAG, we will check database `dag`
table + file system.
If it's waiting for a task, ADDITIONAL check will be done to check if that
task exists in the latest DAG file.
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