kaxil commented on code in PR #56202:
URL: https://github.com/apache/airflow/pull/56202#discussion_r2388082086


##########
airflow-core/src/airflow/models/taskinstance.py:
##########
@@ -945,9 +945,12 @@ def next_retry_datetime(self):
 
         For exponential backoff, retry_delay is used as base and will be 
converted to seconds.
         """
-        from airflow.sdk.definitions._internal.abstractoperator import 
MAX_RETRY_DELAY
+        from airflow.sdk.definitions._internal.abstractoperator import 
DEFAULT_RETRY_DELAY, MAX_RETRY_DELAY
 
         delay = self.task.retry_delay
+        if delay is None:
+            # If retry_delay is None, use the default delay
+            delay = DEFAULT_RETRY_DELAY

Review Comment:
   A better solution would be to add a default to `retry_delay` at the 
following place
   
   
https://github.com/apache/airflow/blob/33e1d28a2344ae01ed0896f6718a1e5b9797605f/airflow-core/src/airflow/serialization/serialized_objects.py#L1294
   
   and in the schema:
   
   
https://github.com/apache/airflow/blob/33e1d28a2344ae01ed0896f6718a1e5b9797605f/airflow-core/src/airflow/serialization/schema.json#L286C10-L286C19
   
   ---
   
   But it would be good to understand when this happen for me. Do you 
explicitly pass `retry_delay` as None?
   
   **I think I know why!** -- but yeah let's fix it as above



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