Jaxing opened a new issue, #23776:
URL: https://github.com/apache/airflow/issues/23776
### Apache Airflow version
2.2.5
### What happened
I tried to run a backfill on a dag but got
```
Traceback (most recent call last):
File "/home/airflow/.local/bin/airflow", line 8, in <module>
sys.exit(main())
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/__main__.py", line
48, in main
args.func(args)
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/cli/cli_parser.py",
line 48, in command
return func(*args, **kwargs)
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/utils/cli.py", line
92, in wrapper
return f(*args, **kwargs)
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/cli/commands/dag_command.py",
line 102, in dag_backfill
DAG.clear_dags(
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/models/dag.py", line
1914, in clear_dags
tis = dag.clear(
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/utils/session.py",
line 70, in wrapper
return func(*args, session=session, **kwargs)
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/models/dag.py", line
1853, in clear
tis = self._get_task_instances(
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/models/dag.py", line
1553, in _get_task_instances
raise AirflowException(f"Could not find dag {tii.dag_id}")
airflow.exceptions.AirflowException: Could not find dag
bigquery-processed-data
```
Where `bigquery-processed-data` is an old dag that the current dag
previously had a ExternalTaskMarker to.
### What you think should happen instead
I would expect it to ignore the old configuration of this dag and only use
the current.
### How to reproduce
Not sure.
Possibly:
1. Create two dags A and B where A has an external task marker to B and B
has a external task sensor to A.
2. Run once.
3. Remove dag B and the external task marker.
4. Try to backfill A
### Operating System
Debian GNU/Linux 10 (buster)
### Versions of Apache Airflow Providers
apache-airflow-providers-amazon==3.2.0
apache-airflow-providers-celery==2.1.3
apache-airflow-providers-cncf-kubernetes==3.0.0
apache-airflow-providers-docker==2.5.2
apache-airflow-providers-elasticsearch==2.2.0
apache-airflow-providers-ftp==2.1.2
apache-airflow-providers-google==6.7.0
apache-airflow-providers-grpc==2.0.4
apache-airflow-providers-hashicorp==2.1.4
apache-airflow-providers-http==2.1.2
apache-airflow-providers-imap==2.2.3
apache-airflow-providers-microsoft-azure==3.7.2
apache-airflow-providers-mysql==2.2.3
apache-airflow-providers-odbc==2.0.4
apache-airflow-providers-postgres==4.1.0
apache-airflow-providers-redis==2.0.4
apache-airflow-providers-sendgrid==2.0.4
apache-airflow-providers-sftp==2.5.2
apache-airflow-providers-slack==4.2.3
apache-airflow-providers-sqlite==2.1.3
apache-airflow-providers-ssh==2.4.3
### Deployment
Other Docker-based deployment
### Deployment details
Kubernetes deployment on GKE. I can add the yamls if they are relevant but I
don't see how
### 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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