Marcus Levine created AIRFLOW-5207:
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Summary: Mark Success and Mark Failed views error out due to DAG
reassignment
Key: AIRFLOW-5207
URL: https://issues.apache.org/jira/browse/AIRFLOW-5207
Project: Apache Airflow
Issue Type: Bug
Components: ui
Affects Versions: 1.10.4
Reporter: Marcus Levine
Assignee: Marcus Levine
Fix For: 1.10.5
When trying to clear a task after upgrading to `1.10.4`, I get the following
traceback:
```
File "/usr/local/lib/python3.7/site-packages/airflow/www/views.py", line 1451,
in failed future, past, State.FAILED) File
"/usr/local/lib/python3.7/site-packages/airflow/www/views.py", line 1396, in
_mark_task_instance_state task.dag = dag File
"/usr/local/lib/python3.7/site-packages/airflow/models/baseoperator.py", line
509, in dag "The DAG assigned to {} can not be changed.".format(self))
airflow.exceptions.AirflowException: The DAG assigned to <Task(SubDagOperator):
my-dag> can not be changed.
```
This should be a simple fix by either dropping the `task.dag = dag` line, or if
it is required to keep things working, just set the private attribute instead:
`task._dag = dag`
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