MondeSinxi opened a new issue, #35974: URL: https://github.com/apache/airflow/issues/35974
### What do you see as an issue? https://airflow.apache.org/docs/apache-airflow/2.7.3/core-concepts/dags.html#trigger-rules The trigger rule for `one_success` states that " At least one upstream task has succeeded (does not wait for all upstream tasks to be done)". I believe that this should be changed to "At least one parent task has succeeded...". In the code snippet below I have a `task_f`, the trigger rule is set to `one_success`, I expect that once task `a` has succeeded (as on of the upstream tasks of `f`) then `f` should also run. However, the task is marked as `upstream_failed` as soon as task `c` fails. The expected behavior does not line up with the documentations. ``` import time from datetime import datetime from airflow import DAG from airflow.operators.python import PythonOperator from airflow.utils.trigger_rule import TriggerRule def wait(): time.sleep(3) def fail(): raise Exception("I should fail!") with DAG("example", schedule=None, start_date=datetime(2023, 11, 30)) as dag: task_a = PythonOperator(task_id="a", python_callable=wait) task_b = PythonOperator(task_id="b", python_callable=wait) task_c = PythonOperator(task_id="c", python_callable=fail) task_d = PythonOperator(task_id="d", python_callable=wait) task_e = PythonOperator(task_id="e", python_callable=wait) task_f = PythonOperator(task_id="f", python_callable=wait, trigger_rule=TriggerRule.ONE_SUCCESS) task_a >> task_b >> task_c >> task_d >> task_f task_c >> task_e >> task_f ```  ### Solving the problem I believe that this should be changed to "At least one parent task has succeeded...". ### Anything else _No response_ ### Are you willing to submit PR? - [X] Yes I am willing to submit a PR! ### Code of Conduct - [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@airflow.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
