Trying to delete task in airflow causes mushroom cloud error

[Reed Villanueva <rv...@ucera.org>]

Using airflow v1.9.0. Trying to set task state to failed for a task that is
taking too long (the task itself is running a sqoop command to get data
from another DB, if that may be relevant). When trying to set the state of
the task to failed via the webserver UI, I get the mushroom cloud error
page and the error trace below.

Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/flask/app.py", line 1988, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/lib64/python2.7/site-packages/flask/app.py", line 1641,
in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/lib64/python2.7/site-packages/flask/app.py", line 1544,
in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/lib64/python2.7/site-packages/flask/app.py", line 1639,
in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/lib64/python2.7/site-packages/flask/app.py", line 1625,
in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/usr/lib/python2.7/site-packages/flask_admin/base.py", line 69, in inner
    return self._run_view(f, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/flask_admin/base.py", line
368, in _run_view
    return fn(self, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/flask_admin/model/base.py",
line 2068, in action_view
    return self.handle_action()
  File "/usr/lib/python2.7/site-packages/flask_admin/actions.py", line
113, in handle_action
    response = handler[0](ids)
  File "/usr/lib/python2.7/site-packages/airflow/www/views.py", line
2498, in action_set_failed
    self.set_task_instance_state(ids, State.FAILED)
  File "/usr/lib/python2.7/site-packages/airflow/utils/db.py", line
50, in wrapper
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/airflow/www/views.py", line
2540, in set_task_instance_state
    raise Exception("Ooops")Exception: Ooops

Happens both for tasks that are running or queued to run.

Not sure what to make of this. Anyone with more airflow experience have any
further debugging tips or know how to fix this? Any other info that should
be added to this question for debugging?

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