ldacey opened a new issue, #34227:
URL: https://github.com/apache/airflow/issues/34227
### Apache Airflow version
2.7.1
### What happened
120 DAGs broke when I updated to Airflow 2.7.1. I had to revert to 2.7.0
again, so the tests below are from a local deployment.
The error message is the same for all DAGs:
```python
Broken DAG: [/opt/airflow/dags/dag-name.py] Traceback (most recent call
last):
File
"/home/airflow/.local/lib/python3.11/site-packages/airflow/models/dag.py", line
640, in __init__
self.validate_schedule_and_params()
File
"/home/airflow/.local/lib/python3.11/site-packages/airflow/models/dag.py", line
3289, in validate_schedule_and_params
raise AirflowException(
airflow.exceptions.AirflowException: DAG Schedule must be None, if there are
any required params without default values
```
After testing, I found that if I change the blob_prefix param to "" instead
of None, the DAG imports successfully. I have various other params which are
None that I will probably need to assign default values for (in reality, the
function which Airflow runs handles cases if the value is None, but I guess I
need to add a default in the DAG). All 120 DAGs with errors had a field like
this in the "params" dictionary I pass to Airflow params.
```python
params = {
"exclude_pattern": "*errors*",
"blob_prefix": None,
```
### What you think should happen instead
These are legacy DAGs which have run for a long time without changes (old
Airflow instance), so I did not expect an upgrade to break them.
### How to reproduce
I believe the root cause is passing a param with the value None to the DAG
params:
```python
params = {
subfolder=None,
conn_id="gcs_conn_id",
}
@dag(
dag_id="dag-example",
start_date=datetime(2023, 2, 2, tz="America/New_York"),
schedule="41 2 * * *",
params=params,
)
```
### Operating System
Ubuntu 22.04
### Versions of Apache Airflow Providers
Providers info
apache-airflow-providers-celery | 3.3.3
apache-airflow-providers-common-sql | 1.7.1
apache-airflow-providers-docker | 3.7.4
apache-airflow-providers-ftp | 3.5.1
apache-airflow-providers-google | 10.7.0
apache-airflow-providers-http | 4.5.1
apache-airflow-providers-imap | 3.3.1
apache-airflow-providers-microsoft-azure | 6.3.0
apache-airflow-providers-mysql | 5.3.0
apache-airflow-providers-odbc | 4.0.0
apache-airflow-providers-openlineage | 1.0.2
apache-airflow-providers-postgres | 5.6.0
apache-airflow-providers-redis | 3.3.1
apache-airflow-providers-sftp | 4.6.0
apache-airflow-providers-sqlite | 3.4.3
apache-airflow-providers-ssh | 3.7.2
### Deployment
Other Docker-based deployment
### Deployment details
Docker Swarm using docker stack deploy
### Anything else
DAGs fail to import when deployed on 2.7.1
### 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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