uranusjr commented on code in PR #40030:
URL: https://github.com/apache/airflow/pull/40030#discussion_r1625210434


##########
airflow/models/dag.py:
##########
@@ -800,10 +801,21 @@ def validate(self):
                 f"inconsistent schedule: timetable {self.timetable.summary!r} "
                 f"does not match schedule_interval {self.schedule_interval!r}",
             )
+        self.validate_executor_field()
         self.validate_schedule_and_params()
         self.timetable.validate()
         self.validate_setup_teardown()
 
+    def validate_executor_field(self):
+        for task in self.tasks:
+            if task.executor:
+                try:
+                    ExecutorLoader.lookup_executor_name_by_str(task.executor)
+                except AirflowException:

Review Comment:
   We should make the exception in `lookup_executor_name_by_str` more specific 
and only catch that exception here. `AirflowException` is too broad.



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