[jira] [Created] (AIRFLOW-619) Gantt chart raises exception when there are running TaskInstances of the DagRun

["Daniel Gies (JIRA)" <ji...@apache.org>]

Daniel Gies created AIRFLOW-619:
-----------------------------------

             Summary: Gantt chart raises exception when there are running TaskInstances of the DagRun
                 Key: AIRFLOW-619
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-619
             Project: Apache Airflow
          Issue Type: Bug
    Affects Versions: Airflow 2.0
            Reporter: Daniel Gies


If you view the Gantt chart for a DagRun while there are TaskInstances still running, the Gantt chart throws an exception calling isoformat() on None because the task instance has no end_date

{code}
Traceback (most recent call last):
  File "/home/dgies/airflow/venv/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/dgies/airflow/venv/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/dgies/airflow/venv/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/dgies/airflow/venv/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/dgies/airflow/venv/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/dgies/airflow/venv/lib/python2.7/site-packages/flask_admin/base.py", line 68, in inner
    return self._run_view(f, *args, **kwargs)
  File "/home/dgies/airflow/venv/lib/python2.7/site-packages/flask_admin/base.py", line 367, in _run_view
    return fn(self, *args, **kwargs)
  File "/home/dgies/airflow/venv/lib/python2.7/site-packages/flask_login.py", line 755, in decorated_view
    return func(*args, **kwargs)
  File "/home/dgies/airflow/venv/lib/python2.7/site-packages/airflow/www/utils.py", line 125, in wrapper
    return f(*args, **kwargs)
  File "/home/dgies/airflow/venv/lib/python2.7/site-packages/airflow/www/views.py", line 1701, in gantt
    'isoEnd': ti.end_date.isoformat()[:-4],
AttributeError: 'NoneType' object has no attribute 'isoformat'
{code}

Proposed fix is to use `ti.end_date or datetime.now()` everywhere ti.end_date is used in the view.  This problem doesn't seem to affect any of the other views, only Gantt.



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