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https://issues.apache.org/jira/browse/AIRFLOW-3658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16820959#comment-16820959
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Ash Berlin-Taylor commented on AIRFLOW-3658:
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Will be fixed in 1.10.4
> 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
> Priority: Major
>
> 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 hour
> skipped to 3am. This means that 2018-03-25T02:00:00 is not a valid datetime
> in that timezone.
> I created a dag with these parameters:
>
> {code:java}
> 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 * * *'
> {code}
>
> When I call dag.get_run_dates(), it never returns.
>
> Does this mean, 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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