[GitHub] [airflow] ephraimbuddy commented on a change in pull request #16182: Do not queue tasks when the DAG goes missing

[GitBox <gi...@apache.org>]

ephraimbuddy commented on a change in pull request #16182:
URL: https://github.com/apache/airflow/pull/16182#discussion_r652433551



##########
File path: airflow/jobs/scheduler_job.py
##########
@@ -1418,6 +1421,37 @@ def _clean_tis_without_dagrun(self, session):
                     raise
             guard.commit()
 
+    @provide_session
+    def _missing_dag_cleanup(self, session: Session = None):
+        """Fails task instances and DagRuns of DAGs that no longer exist in the dag folder/DB"""
+        states_to_check = State.unfinished - frozenset([State.NONE, State.SHUTDOWN])
+        tis = session.query(TI).filter(TI.state.in_(states_to_check)).all()
+        missing_dags = {}
+        dag_runs = set()
+
+        for ti in tis:
+            if ti.dag_id in missing_dags:
+                ti.set_state(State.FAILED, session=session)
+                continue
+            # Dag no longer in dagbag?
+            if not self.dagbag.has_dag(ti.dag_id, session=session):
+                ti.set_state(State.FAILED, session=session)
+                dag_runs.add(ti.dag_run)
+                missing_dags[ti.dag_id] = [ti]
+                continue

Review comment:
       ```suggestion
   ```




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