Till Heistermann created AIRFLOW-3422:
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Summary: Infinite loops during springtime DST transitions on
python 3.6
Key: AIRFLOW-3422
URL: https://issues.apache.org/jira/browse/AIRFLOW-3422
Project: Apache Airflow
Issue Type: Bug
Affects Versions: 1.10.1
Reporter: Till Heistermann
Automatic DST transitions can cause dags to be stuck in an infinite loop, if
they happen to be scheduled in the "skipped" hour during a springtime DST
transition.
The fix introduced in https://issues.apache.org/jira/browse/AIRFLOW-3277 does
not seem to work for python 3.6, only for 3.5 and 2.7.
Example to reproduce (current master, python 3.6):
{code:java}
import pendulum
from datetime import datetime
from airflow.utils.timezone import make_aware
from airflow.models import DAG
nsw = pendulum.Timezone.load("Australia/Sydney")
dt = make_aware(datetime(2018, 10, 3, 2, 30), nsw)
dag = DAG("id", schedule_interval="30 2 * * *", start_date=dt)
dt = dag.following_schedule(dt); print(dt)
dt = dag.following_schedule(dt); print(dt)
dt = dag.following_schedule(dt); print(dt)
dt = dag.following_schedule(dt); print(dt)
dt = dag.following_schedule(dt); print(dt)
dt = dag.following_schedule(dt); print(dt)
dt = dag.following_schedule(dt); print(dt)
dt = dag.following_schedule(dt); print(dt)
dt = dag.following_schedule(dt); print(dt)
{code}
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