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https://issues.apache.org/jira/browse/AIRFLOW-5207?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcus Levine closed AIRFLOW-5207.
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Resolution: Not A Problem
This turned out to be an issue with one of our plugins
> 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
> Priority: Major
> Fix For: 1.10.5
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> When trying to clear a task after upgrading to 1.10.4, I get the following
> traceback:
> {code:java}
> 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.{code}
> This should be a simple fix by either dropping the offending line, or if it
> is required to keep things working, just set the private attribute instead:
> {code:java}
> task._dag = dag
> {code}
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