dheerajturaga opened a new pull request, #56202:
URL: https://github.com/apache/airflow/pull/56202
During migration from Airflow 3.0 to 3.1, some task instances may have
retry_delay set to None due to serialization/deserialization changes or
database migration issues. This causes the scheduler to crash with:
TypeError: unsupported operand type(s) for +: 'datetime.datetime' and
'NoneType'
The error occurs in TaskInstance.next_retry_datetime() when attempting to
add a None retry_delay to end_date.
This fix adds a null check and falls back to DEFAULT_RETRY_DELAY
(configured
via core.default_task_retry_delay, defaults to 300 seconds) when
retry_delay
is None, preventing the scheduler crash while maintaining proper retry
behavior.
Fixes: scheduler crash in next_retry_datetime() method
Related: Airflow 3.0 to 3.1 migration compatibility
```
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/models/taskinstance.py",
line 991, in next_retry_datetime
return self.end_date + delay
~~~~~~~~~~~~~~^~~~~~~
TypeError: unsupported operand type(s) for +: 'datetime.datetime' and
'NoneType'
```
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