lohitkolluri commented on code in PR #67900:
URL: https://github.com/apache/airflow/pull/67900#discussion_r3350706442
##########
airflow-core/src/airflow/models/backfill.py:
##########
@@ -653,7 +653,7 @@ def _create_backfill(
triggering_user_name=triggering_user_name,
)
session.add(br)
- session.commit()
+ session.flush()
Review Comment:
Good catch — reverting `session.flush()` back to `session.commit()` to
restore the visibility guarantee. The backfill is now committed immediately so
concurrent requests see it in the `num_active` check, preventing duplicate
active backfills. The atomicity trade-off (orphaned backfill if DagRun creation
fails) is the pre-existing behavior and is acceptable since the error handling
is already improved with retries and a graceful 503. Pushed in `db990c3`.
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