ephraimbuddy commented on issue #16983:
URL: https://github.com/apache/airflow/issues/16983#issuecomment-882043796
The `on_failure_callback` is a task argument and not DAG level argument.
The correct dag is:
```
import sys
from datetime import datetime
from airflow import DAG
from airflow.models import Variable
from airflow.operators.python_operator import PythonOperator
def on_failure(ctx):
print('hello world')
print(ctx)
def always_fails():
sys.exit(1)
dag = DAG(
dag_id='always_fails',
description='dag that always fails',
schedule_interval=None,
catchup=False,
start_date=datetime(2021,7,12),
)
task = PythonOperator(task_id='test-error-notifier',
python_callable=always_fails,on_failure_callback=on_failure, dag=dag)
```
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