nathadfield opened a new issue #12659:
URL: https://github.com/apache/airflow/issues/12659
**Apache Airflow version**: 1.10.13
**What happened**:
After performing an upgrade to `v1.10.13` we noticed that tasks in some of
our DAGs were not be scheduled. After a bit of investigation we discovered
that by commenting out `'depends_on_past': True` the issue went away.
**What you expected to happen**:
We think the issue might have something to do with this which was introduced
to `1.10.13`
[AIRFLOW-3607] Only query DB once per DAG run for TriggerRuleDep (#4751)
**How to reproduce it**:
1. Install Airflow v1.10.13 from pip
2. Start webserver and scheduler
3. Add the following code as a DAG
4. Switch the DAG on in the UI.
```
from airflow import models
from airflow.operators.dummy_operator import DummyOperator
from datetime import datetime, timedelta
default_args = {
'owner': 'airflow',
'start_date': datetime(2018, 10, 31),
'depends_on_past': True,
'retries': 3,
'retry_delay': timedelta(minutes=5)
}
dag_name = 'my-test-dag'
with models.DAG(dag_name,
default_args=default_args,
schedule_interval='0 0 * * *',
catchup=False,
max_active_runs=5,
) as dag:
test = DummyOperator(
task_id='test'
)
```
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