atul-astronomer opened a new issue, #47948:
URL: https://github.com/apache/airflow/issues/47948
### Apache Airflow version
main (development)
### If "Other Airflow 2 version" selected, which one?
_No response_
### What happened?
ExternalTaskSensor with mode='reschedule' raising module 'airflow.settings'
has no attribute 'engine' error
```
Traceback (most recent call last):
File "/opt/airflow/airflow/sensors/base.py", line 206, in
_validate_input_values
if self.reschedule and _is_metadatabase_mysql():
File "/opt/airflow/airflow/sensors/base.py", line 60, in
_is_metadatabase_mysql
if settings.engine is None:
AttributeError: module 'airflow.settings' has no attribute 'engine'
```
### What you think should happen instead?
_No response_
### How to reproduce
Have the below Dag in dags folder and notice import error:
```python
from airflow import DAG
from airflow.providers.standard.operators.empty import EmptyOperator
from airflow.sensors.external_task import ExternalTaskMarker,
ExternalTaskSensor
from pendulum import today
start_date = today('UTC').add(days=-1)
with DAG(
dag_id="example_external_task_marker_parent",
start_date=start_date,
schedule=None,
tags=["core"],
) as parent_dag:
# [START howto_operator_external_task_marker]
parent_task = ExternalTaskMarker(
task_id="parent_task",
external_dag_id="example_external_task_marker_child",
external_task_id="child_task1",
)
# [END howto_operator_external_task_marker]
with DAG(
dag_id="example_external_task_marker_child",
start_date=start_date,
schedule=None,
tags=["core"],
) as child_dag:
# [START howto_operator_external_task_sensor]
child_task1 = ExternalTaskSensor(
task_id="child_task1",
external_dag_id=parent_dag.dag_id,
external_task_id=parent_task.task_id,
timeout=600,
allowed_states=["success"],
failed_states=["failed", "skipped"],
mode="reschedule",
)
# [END howto_operator_external_task_sensor]
child_task2 = EmptyOperator(task_id="child_task2")
child_task1 >> child_task2
```
### Operating System
Linux
### Versions of Apache Airflow Providers
_No response_
### Deployment
Other
### Deployment details
_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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