[jira] [Commented] (AIRFLOW-852) Docs: Cancel a triggered dag

["Quijano Flores (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AIRFLOW-852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16572113#comment-16572113 ] 

Quijano Flores commented on AIRFLOW-852:
----------------------------------------

I get an error when I do this [~salad_king]

`AttributeError: 'NoneType' object has no attribute 'is_paused'`

```
Traceback (most recent call last):
 File "/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1988, in wsgi_app
 response = self.full_dispatch_request()
 File "/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1641, in full_dispatch_request
 rv = self.handle_user_exception(e)
 File "/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1544, in handle_user_exception
 reraise(exc_type, exc_value, tb)
 File "/anaconda3/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
 raise value
 File "/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1639, in full_dispatch_request
 rv = self.dispatch_request()
 File "/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1625, in dispatch_request
 return self.view_functions[rule.endpoint](**req.view_args)
 File "/anaconda3/lib/python3.6/site-packages/flask_admin/base.py", line 69, in inner
 return self._run_view(f, *args, **kwargs)
 File "/anaconda3/lib/python3.6/site-packages/flask_admin/base.py", line 368, in _run_view
 return fn(self, *args, **kwargs)
 File "/anaconda3/lib/python3.6/site-packages/flask_login.py", line 755, in decorated_view
 return func(*args, **kwargs)
 File "/anaconda3/lib/python3.6/site-packages/airflow/www/utils.py", line 125, in wrapper
 return f(*args, **kwargs)
 File "/anaconda3/lib/python3.6/site-packages/airflow/www/views.py", line 1606, in paused
 orm_dag.is_paused = True
```

> Docs: Cancel a triggered dag
> ----------------------------
>
>                 Key: AIRFLOW-852
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-852
>             Project: Apache Airflow
>          Issue Type: Improvement
>          Components: docs
>            Reporter: Andi Pl
>            Priority: Major
>
> Issue: Cancel an externally triggered dag.
> The dag is running and contains 200 parallel tasks. Only 3 are run at once, as the celery executor is limited to 3 in parallel.
> 23 tasks are finished till now.
> We want to cancel the execution of the missing tasks. But they are not queued yet. How can we  cancel them?



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