LiuQhahah opened a new pull request, #54648:
URL: https://github.com/apache/airflow/pull/54648
Fixes a bug where the scheduler would crash when trying to expand a mapped
task. The MappedOperator object in the scheduler was missing the
map_index_template attribute, leading to an
AttributeError.
# Problem
- When the scheduler prepares a mapped task for execution, it builds a
template context for the task instance.
- This process involves accessing the map_index_template attribute on the
task object.
- The MappedOperator object used by the scheduler was missing this
attribute, causing the scheduler to fail with an AttributeError:
'MappedOperator' object has no attribute 'map_index_template'.
# Solution
- Add the map_index_template property to the MappedOperator class located
in airflow-core/src/airflow/models/mappedoperator.py.
- This property now correctly retrieves the value from the operator's
partial_kwargs, ensuring the attribute is available to the scheduler at runtime.
# Testing
- The fix was validated by ensuring the scheduler no longer crashes when
running DAGs with mapped tasks in the local environment
- Manual inspection confirms the map_index_template attribute is now
correctly accessed.
<img width="1446" height="660" alt="image"
src="https://github.com/user-attachments/assets/9644e9fc-818e-4506-a008-d885084c083a";
/>
reproduce :
<img width="1205" height="679" alt="image"
src="https://github.com/user-attachments/assets/5b098af0-10f5-4375-a26b-853c942d34c0";
/>
Related Issues
Closes #54627
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