MWAA 2.2.2 CLI Backfill skips a day

Question

I am experiencing this issue where the backfill job skips a day and runs that day at the end on MWAA 2.2.2

For example: I am trying to run a **backfill** on a DAG `dag_name`. The dag has these parameters: `depends_on_past=True`, `max_active_runs=1`

I pass the below command as a JSON config to my separate backfill DAG.

```
airflow dags backfill -s 2022-05-01 -e 2022-05-10 dag_name
```

The backfill job is skipping the `2022-05-02` task and only runs it at the end. I was expecting Airflow would run it after the `2022-05-01` task. Basically, the backfill is not respecting the `depends_on_past=True` parameter which `dag_name` DAG has. I think another person reported the same issue https://github.com/apache/airflow/discussions/23808.

![Enter image description here](https://repost.aws/media/postImages/original/IML6u0sZZ8S5ewfsqYGMRGaA)

Note: It runs as expected in the correct order when I let it backfill automatically with `catchup=True`. This only happens when someone tries to run the backfill manually with BashOperator.

Answer

Hello,

The issue mentioned in https://github.com/apache/airflow/discussions/23808 seems to be a general issue with respect to Airflow and not particularly related to MWAA. However, I have used the below code to replicate the issue at my end and we could see that the code ran without any issue. Hence, request you to please reach out to support engineering to address your specific issue.

Below is the code for base DAG that will be triggered using the trigger DAG:

—————————————

"""
Code that goes along with the Airflow located at:
http://airflow.readthedocs.org/en/latest/tutorial.html
"""

from airflow import DAG
from airflow.operators.bash_operator import BashOperator
from datetime import datetime, timedelta

default_args = {
    "owner": "airflow",
    "start_date": datetime(2022, 4, 1),
    "email": ["airflow@airflow.com"],
    "email_on_failure": False,
    "email_on_retry": False,
    "retries": 1,
    "depends_on_past": True,
    "retry_delay": timedelta(minutes=5)
}

dag = DAG("tutorial_depend", default_args=default_args, catchup=False, schedule_interval='@daily')

t1 = BashOperator(task_id="print_date", bash_command="sleep 5", dag=dag)

t2 = BashOperator(task_id="sleep", bash_command="sleep 5", retries=3, dag=dag)

templated_command = """
    {% for i in range(5) %}
        echo "{{ ds }}"
        echo "{{ macros.ds_add(ds, 7)}}"
        echo "{{ params.my_param }}"
    {% endfor %}
"""

t3 = BashOperator(
    task_id="templated",
    bash_command=templated_command,
    params={"my_param": "Parameter I passed in"},
    dag=dag,
)

t2.set_upstream(t1)
t3.set_upstream(t1)

—————————————

Trigger DAG code : The command was passed in the form of JSON { "command" : "airflow dags backfill -x -s '2022-04-02' -e '2022-04-12' --rerun-failed-tasks tutorial_depend"}

—————————————

from airflow import DAG
from airflow.operators.bash_operator import BashOperator
from airflow.utils.dates import days_ago
with DAG(dag_id="any_bash_command_dag", schedule_interval=None, catchup=False, start_date=days_ago(1)) as dag:
    cli_command = BashOperator(
        task_id="bash_command",
        bash_command="{{ dag_run.conf['command'] }}”
    )

—————————————

================

Have a nice day!

MWAA 2.2.2 CLI Backfill skips a day

Contenus pertinents