[jira] [Created] (AIRFLOW-3658) dag.get_run_dates() goes into infinite loop in case of missing date, cause by DST switch

["Peter Erben (JIRA)" <ji...@apache.org>]

Peter Erben created AIRFLOW-3658:
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             Summary: dag.get_run_dates() goes into infinite loop in case of missing date, cause by DST switch
                 Key: AIRFLOW-3658
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-3658
             Project: Apache Airflow
          Issue Type: Bug
          Components: DAG
    Affects Versions: 1.10.1
         Environment: ubuntu 16.04
python 3.6
airflow 1.10.1
            Reporter: Peter Erben


In airflow.cfg the default_timezone is Europe/Budapest. In this timezone the winter to summer DST switch happened on 2018-03-25 at 2am, when the the the hour skipped to 3am. This means that 2018-03-24T02:00:00 is not a valid datetime in that timezone.

I created a dag with these parameters:

{{start_date = datetime(2018,3,25,0,0) - timedelta(days=2)}}

{{end_date = datetime(2018,3,25,0,0) + timedelta(days=2)}}

{{schedule_interval  = '0 2 * * *'}}

When I call dag.get_run_dates(), it never returns.

 

Does this means, that Airflow fails to schedule any tasks if I try to set the Europe/Budapest timezone, and the daily time defined by the cronstring is non-existent on the day of the DST switch? 

 



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