uranusjr commented on a change in pull request #18724:
URL: https://github.com/apache/airflow/pull/18724#discussion_r764611325



##########
File path: airflow/api_connexion/endpoints/task_instance_endpoint.py
##########
@@ -297,15 +296,34 @@ def post_set_task_instances_state(dag_id, session):
         error_message = f"Task ID {task_id} not found"
         raise NotFound(error_message)
 
-    execution_date = data['execution_date']
-    try:
-        session.query(TI).filter_by(execution_date=execution_date, 
task_id=task_id, dag_id=dag_id).one()
-    except NoResultFound:
-        raise NotFound(f"Task instance not found for task {task_id} on 
execution_date {execution_date}")
+    execution_date = data.get('execution_date')
+    run_id = data.get('dag_run_id')
+
+    if run_id and not execution_date:
+        ti = (
+            session.query(func.count(TI.dag_id))
+            .filter(TI.task_id == task_id, TI.dag_id == dag_id, TI.run_id == 
run_id)
+            .scalar()
+        )
+        if not ti:
+            raise NotFound(
+                detail=f"Task instance not found for task {task_id!r} on DAG 
run with ID {run_id!r}"
+            )
+    if execution_date and not run_id:
+        ti = (
+            session.query(TI.run_id)
+            .filter(TI.execution_date == execution_date, TI.task_id == 
task_id, TI.dag_id == dag_id)
+            .first()
+        )
+        if not ti:
+            raise NotFound(
+                detail=f"Task instance not found for task {task_id!r} on 
execution_date {execution_date}"
+            )
+        run_id = ti.run_id

Review comment:
       These two `if` conditions can be simplified a bit since we know only one 
of these two can be provided. Something like
   
   ```python
   if run_id is not None:
       ...
   elif execution_date is not None:
       ...
   ```
   
   should be enough.

##########
File path: airflow/api_connexion/openapi/v1.yaml
##########
@@ -3072,10 +3072,17 @@ components:
           type: string
 
         execution_date:
-          description: The execution date.
+          description: The execution date. Either set this or dag_run_id but 
not both.
           type: string
           format: datetime

Review comment:
       Do we want to deprecate this?




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