jieyao-MilestoneHub opened a new pull request, #44348:
URL: https://github.com/apache/airflow/pull/44348
This PR handle missing DAGs when clearing task instances to prevent
failures. When we delete DAG files and attempt to trigger them again, the
process should access the DAGs and display an error indicating that the DAGs no
longer exist, rather than causing the frontend to show an "Oops" error.
### Summary of Changes:
- Added warning logs for missing DAGs to prevent silent failures during task
clearing.
- Improved error handling for downstream task clearing, including checks for
partial_subset errors to handle cases where DAGs or downstream dependencies are
unavailable.
- Updated the docstring for _clear_task_instances for better clarity and
consistent style.
- Refined the grouping and handling of Task Instances by DAG and DAG Run to
improve robustness and maintainability.
### Issue Reference:
Closes #44274
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