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Date: Wed, 5 Apr 2017 17:22:41 +0000 (UTC)
From: "Bolke de Bruin (JIRA)" <jira@apache.org>
To: commits@airflow.incubator.apache.org
Message-ID: <JIRA.13058651.1490286084000.212845.1491412961721@Atlassian.JIRA>
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Subject: [jira] [Updated] (AIRFLOW-1033) TypeError: can't compare
 datetime.datetime to NoneType in prev_dagrun_dep.py
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archived-at: Wed, 05 Apr 2017 17:22:46 -0000


     [ https://issues.apache.org/jira/browse/AIRFLOW-1033?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bolke de Bruin updated AIRFLOW-1033:
------------------------------------
    Affects Version/s:     (was: Airflow 1.8)
                       1.8.1

> TypeError: can't compare datetime.datetime to NoneType in prev_dagrun_dep.py
> ----------------------------------------------------------------------------
>
>                 Key: AIRFLOW-1033
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1033
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: DagRun
>    Affects Versions: 1.8.1
>         Environment: Centos 7; 
> db: PostgreSQL 9.5
> python version: 2.7
> Installation via pip
>            Reporter: Bert Desmet
>            Priority: Blocker
>              Labels: bug, interval
>             Fix For: 1.8.1
>
>         Attachments: test_dag.py, test_dag.py.log
>
>
> Dear, 
> When starting a specific new dag we get the following error:
> [2017-03-23 16:51:16,354] {jobs.py:354} DagFileProcessor908 ERROR - Got an exception! Propagating...
> Traceback (most recent call last):
>   File "/usr/lib/python2.7/site-packages/airflow/jobs.py", line 346, in helper
>     pickle_dags)
>   File "/usr/lib/python2.7/site-packages/airflow/utils/db.py", line 53, in wrapper
>     result = func(*args, **kwargs)
>   File "/usr/lib/python2.7/site-packages/airflow/jobs.py", line 1581, in process_file
>     self._process_dags(dagbag, dags, ti_keys_to_schedule)
>   File "/usr/lib/python2.7/site-packages/airflow/jobs.py", line 1174, in _process_dags
>     self._process_task_instances(dag, tis_out)
>   File "/usr/lib/python2.7/site-packages/airflow/jobs.py", line 905, in _process_task_instances
>     session=session):
>   File "/usr/lib/python2.7/site-packages/airflow/utils/db.py", line 53, in wrapper
>     result = func(*args, **kwargs)
>   File "/usr/lib/python2.7/site-packages/airflow/models.py", line 1116, in are_dependencies_met
>     session=session):
>   File "/usr/lib/python2.7/site-packages/airflow/models.py", line 1140, in get_failed_dep_statuses
>     dep_context):
>   File "/usr/lib/python2.7/site-packages/airflow/ti_deps/deps/base_ti_dep.py", line 94, in get_dep_statuses
>     for dep_status in self._get_dep_statuses(ti, session, dep_context):
>   File "/usr/lib/python2.7/site-packages/airflow/ti_deps/deps/prev_dagrun_dep.py", line 47, in _get_dep_statuses
>     if dag.previous_schedule(ti.execution_date) < ti.task.start_date:
> TypeError: can't compare datetime.datetime to NoneType
> I have added some debug code to the file 'prev_dagrun_dep.py:
> dag = ti.task.dag
>         print 'Start dates:'
>         print 'previous_exection_date: %s'%(dag.previous_schedule(ti.execution_date))
>         print 'current start date: %s'%(ti.task.start_date)
>         if dag.catchup:
>             if dag.previous_schedule(ti.execution_date) < ti.task.start_date:
> And this is the output I get:
> Start dates:
> previous_exection_date: None
> current start date: 2017-03-19 00:00:00
> I think it is normall that the previous_exection_date is null, since it is the first time this dag is being run. But why is the start_date of the dag important, and not the start date of the run? 
> I have the feeling the cause is the 'schedule_interval', which is set to None. 
> Please find an example and it's log file as an attachment to this mail. 
> Bert


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