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From "Shaw, Damian P. " <damian.sha...@credit-suisse.com>
Subject RE: How to stop airflow running dags (at unscheduled times) automatically when initially turned on?
Date Wed, 23 Oct 2019 21:50:02 GMT

Airflow isn’t like crontab which just runs at a specific time. Airflow checks if it successfully
ran a DAG between the current time and the last time it was due to be scheduled.

So in your example your start date is 2019-10-13 and your schedule is every day at 22:10,
therefore when you start the DAG a DAG Run will be immediately kicked off at there should
have been a scheduled run today (or yesterday) at 22:10.

If you do not want this set your start date to the first DAG Run date you wish to occur(e.g.
at time of writing 2019-10-23 would not run till “tomorrow”).


From: Reed Villanueva [mailto:rvillanueva@ucera.org]
Sent: Wednesday, October 23, 2019 5:18 PM
To: users@airflow.apache.org
Subject: How to stop airflow running dags (at unscheduled times) automatically when initially
turned on?


How to stop airflow running dags (at unscheduled times) automatically when initially turned
on?

My dags look like...

default_args = {

    'owner': 'rvillanueva',

    'depends_on_past': False,

    'start_date': datetime(2019, 10, 13),

    'email': ['me@co.com<mailto:me@co.com>'],

    'email_on_failure': True,

    # 'email_on_retry': False,

    'retries': 0,

    'retry_delay': timedelta(minutes=5),

    'max_active_runs': 3,

    # 'queue': 'bash_queue',

    # 'pool': 'backfill',

    # 'priority_weight': 10,

    # 'end_date': datetime(2016, 1, 1),

}



dag = DAG('mydag', default_args=default_args, catchup=False, schedule_interval="10 22 * *
*")

...

I had thought that having depends_on_past=False or catchup=False would be enough to stop this,
but dags are still running once right when they are turned on in the webserver UI (causing
them end up overlapping runs on their actual scheduled times in some cases).

Is there any way to stop this?

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