potiuk commented on a change in pull request #6596: [AIRFLOW-6004] Untangle 
Executors class to avoid cyclic imports
URL: https://github.com/apache/airflow/pull/6596#discussion_r351275992
 
 

 ##########
 File path: airflow/models/taskinstance.py
 ##########
 @@ -121,6 +120,11 @@ def clear_task_instances(tis,
             dr.start_date = timezone.utcnow()
 
 
+# Key used to identify task instance
+# Tuple of: task_id, , execution_date, ?
+TaskInstanceKey = Tuple[str, str, datetime, int]
 
 Review comment:
   Fixed.

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