airflow example_task_group 源码
airflow example_task_group 代码
文件路径：/airflow/example_dags/example_task_group.py
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# to you under the Apache License, Version 2.0 (the
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"""Example DAG demonstrating the usage of the TaskGroup."""
from __future__ import annotations
import pendulum
from airflow.models.dag import DAG
from airflow.operators.bash import BashOperator
from airflow.operators.empty import EmptyOperator
from airflow.utils.task_group import TaskGroup
# [START howto_task_group]
with DAG(
dag_id="example_task_group",
start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
catchup=False,
tags=["example"],
) as dag:
start = EmptyOperator(task_id="start")
# [START howto_task_group_section_1]
with TaskGroup("section_1", tooltip="Tasks for section_1") as section_1:
task_1 = EmptyOperator(task_id="task_1")
task_2 = BashOperator(task_id="task_2", bash_command='echo 1')
task_3 = EmptyOperator(task_id="task_3")
task_1 >> [task_2, task_3]
# [END howto_task_group_section_1]
# [START howto_task_group_section_2]
with TaskGroup("section_2", tooltip="Tasks for section_2") as section_2:
task_1 = EmptyOperator(task_id="task_1")
# [START howto_task_group_inner_section_2]
with TaskGroup("inner_section_2", tooltip="Tasks for inner_section2") as inner_section_2:
task_2 = BashOperator(task_id="task_2", bash_command='echo 1')
task_3 = EmptyOperator(task_id="task_3")
task_4 = EmptyOperator(task_id="task_4")
[task_2, task_3] >> task_4
# [END howto_task_group_inner_section_2]
# [END howto_task_group_section_2]
end = EmptyOperator(task_id='end')
start >> section_1 >> section_2 >> end
# [END howto_task_group]
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