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https://issues.apache.org/jira/browse/AIRFLOW-5623?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Winkel reassigned AIRFLOW-5623:
--------------------------------------

    Assignee: Martin Winkel

> latest_only_operator fails for schedule_interval='@once'
> --------------------------------------------------------
>
>                 Key: AIRFLOW-5623
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-5623
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: operators
>    Affects Versions: 1.10.5
>            Reporter: Gerben Oostra
>            Assignee: Martin Winkel
>            Priority: Minor
>
> Observation: In a dag with schedule_interval set to @once, the 
> `latest_only_operator` fails with the following error:
>  
> {{[2019-10-09 09:51:37,346] \{latest_only_operator.py:48} INFO - Checking 
> latest only with left_window: None right_window: None now: 2019-10-09 
> 07:51:37.346697+00:00
> [2019-10-09 09:51:37,347] \{models.py:1736} ERROR - '<' not supported between 
> instances of 'NoneType' and 'datetime.datetime'
> Traceback (most recent call last):
>   File 
> "/XXXX/anaconda/envs/airflow/lib/python3.6/site-packages/airflow/models.py", 
> line 1633, in _run_raw_task
>     result = task_copy.execute(context=context)
>   File 
> "/XXXX/anaconda/envs/airflow/lib/python3.6/site-packages/airflow/operators/latest_only_operator.py",
>  line 51, in execute
>     if not left_window < now <= right_window:
> TypeError: '<' not supported between instances of 'NoneType' and 
> 'datetime.datetime'
> [2019-10-09 09:51:37,363] \{models.py:1756} INFO - Marking task as 
> UP_FOR_RETRY}}
> I expected it to succeed, and allow the remainder of the dag to be ran. (if 
> an @once dag is running, it is always the latest)
> Rootcause analysis:
> If the `schedule_interval` of a dag is `@once`, the dag's field 
> `self._schedule_interval` is set to `None`.
> The `latest_only_operator` determines the window by passing the execution 
> date to the dags `following_schedule()`. There the dag's 
> `self._schedule_interval` type is compared to `six.string_types` and 
> `timedelta`. Both type checks fail, so nothing (`None`) is returned.
> Causing the time window comparison to fail.



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