ffinfo commented on a change in pull request #4396: [AIRFLOW-3585] - Add edges 
to database
URL: https://github.com/apache/airflow/pull/4396#discussion_r259609030
 
 

 ##########
 File path: airflow/models/__init__.py
 ##########
 @@ -688,6 +632,57 @@ def __init__(self, task, execution_date, state=None):
         # Not persisted to the database so only valid for the current process
         self.raw = False
 
+    @staticmethod
+    @provide_session
+    def clear_task_instances(tis,
+                             activate_dag_runs=True,
+                             dag=None,
+                             session=None
+                             ):
+        """
+        Clears a set of task instances, but makes sure the running ones
+        get killed.
+
+        :param tis: a list of task instances
 
 Review comment:
   fixed this

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