task_group_decorator

Example DAG demonstrating the usage of the @taskgroup decorator.

Airflow Fundamentals


Providers:

Run this DAG

1. Install the Astronomer CLI:Skip if you already have the CLI

2. Initate the project in a local directory:

3. Copy and paste the code below into a file in the

dags
directory.

4. Run the DAG from the local directory where the project was initiated:

#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
"""Example DAG demonstrating the usage of the @taskgroup decorator."""
from airflow.decorators import task, task_group
from airflow.models.dag import DAG
from airflow.utils.dates import days_ago
# [START howto_task_group_decorator]
# Creating Tasks
@task
def task_start():
"""Dummy Task which is First Task of Dag"""
return '[Task_start]'
@task
def task_1(value):
"""Dummy Task1"""
return f'[ Task1 {value} ]'
@task
def task_2(value):
"""Dummy Task2"""
return f'[ Task2 {value} ]'
@task
def task_3(value):
"""Dummy Task3"""
print(f'[ Task3 {value} ]')
@task
def task_end():
"""Dummy Task which is Last Task of Dag"""
print('[ Task_End ]')
# Creating TaskGroups
@task_group
def task_group_function(value):
"""TaskGroup for grouping related Tasks"""
return task_3(task_2(task_1(value)))
# Executing Tasks and TaskGroups
with DAG(dag_id="example_task_group_decorator", start_date=days_ago(2), tags=["example"]) as dag:
start_task = task_start()
end_task = task_end()
for i in range(5):
current_task_group = task_group_function(i)
start_task >> current_task_group >> end_task
# [END howto_task_group_decorator]