KulykDmytro opened a new issue #18870:
URL: https://github.com/apache/airflow/issues/18870
### Apache Airflow version
2.1.4 (latest released)
### Operating System
Linux 5.4.149-73.259.amzn2.x86_64
### Versions of Apache Airflow Providers
_No response_
### Deployment
Other 3rd-party Helm chart
### Deployment details
Python-3.9
### What happened
define DAG using TaskFlow:
```python
with DAG(
dag_id='dag1',
start_date=datetime(2021, 9, 28),
) as dag:
@task()
def task1():
print('task1')
@task(task_concurrency=1, depends_on_past=True, sla=timedelta(hours=12))
def task2():
return ['id1', 'id2']
@task(multiple_outputs=True)
def task3(transaction_ids: list[str]):
return {
'all_transactions': 2,
'error_transaŃtions': 0,
'error_stats': [{'code': '802', 'message': 'Error1', 'count': 1}]
}
send = task2()
send.set_upstream(task1())
task3(send)
```
When observing scheduled log multiple times:
```
[2021-10-10 10:48:57,473] {baseoperator.py:1295} WARNING - Dependency
<Task(_PythonDecoratedOperator): task2>, task3 already registered for DAG: dag1
[2021-10-10 10:48:57,474] {baseoperator.py:1295} WARNING - Dependency
<Task(_PythonDecoratedOperator): task3>, task2 already registered for DAG: dag1
```
Same warning when trying to serialize DAGBag programmatically
### What you expected to happen
no Warning should appear
### How to reproduce
_No response_
### Anything else
_No response_
### Are you willing to submit PR?
- [ ] 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)
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