CodingJonas opened a new issue #9485: URL: https://github.com/apache/airflow/issues/9485
**Apache Airflow version**:v1.10 **Environment**: Deployed inside a Docker container - **Cloud provider or hardware configuration**: - **OS** (e.g. from /etc/os-release): Ubuntu 18.4 - **Install tools**: pipenv **What happened**: I have a DAG with start date of 1/1/2018 and schedule to run through a cron expression (e.g. every 2 hours). This is the first time I start Airflow with a new database. No DAG has ever run before. As soon as I unpause my DAG, the scheduler will start running one DAG. I set `catchup=False` to stop this behaviour from happening, yet it still schedules exactly one DAG for backfill. If there was a previous DAG run this behaviour does not happen. I found a [reference to this issue](https://stackoverflow.com/questions/52177418/how-to-stop-dag-from-backfilling-catchup-by-default-false-and-catchup-false-doe#comment92792366_52922501) already from 2018, which describes a very similar problem, but I couldn't find an open issue to this. **What you expected to happen**: If I set `catchup=False`, I expect no backfill to happen. **How to reproduce it**: These are the DAG settings I use: ```python dag_params = dict( dag_id='test', schedule_interval='0 */2 * * *', start_date=datetime(2018, 1, 1), max_active_runs=1, catchup=False, ) ``` **Comment**: I read somewhere that setting a future `start_date` could help, I tried it with `datetime(3018, 1, 1)`, which got rid of the unwanted backfill, but no DAGs got executed. More interestingly it started a DAG and instantly set it to 'success´ without running a single task. But I think this is unrelated to this issue. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
