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Speed up clearing downstream tasks on large Dags #71203

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Speed up clearing downstream tasks on large Dags #71203

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3 changes: 2 additions & 1 deletion airflow-core/src/airflow/serialization/definitions/dag.py
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Original file line number Diff line number Diff line change
Expand Up @@ -303,12 +303,13 @@ def is_task(obj) -> TypeIs[SerializedOperator]:
else:
matched_tasks = [t for t in self.tasks if t.task_id in task_ids]

matched_task_ids = {t.task_id for t in matched_tasks}
also_include_ids: set[str] = set()
for t in matched_tasks:
if include_downstream:
for rel in t.get_flat_relatives(upstream=False, depth=depth):
also_include_ids.add(rel.task_id)
if rel not in matched_tasks: # if it's in there, we're already processing it
if rel.task_id not in matched_task_ids: # if it's in there, we're already processing it
# need to include setups and teardowns for tasks that are in multiple
# non-collinear setup/teardown paths
if not rel.is_setup and not rel.is_teardown:
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