airflow example_nested_branch_dag 源码
airflow example_nested_branch_dag 代码
文件路径：/airflow/example_dags/example_nested_branch_dag.py
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"""
Example DAG demonstrating a workflow with nested branching. The join tasks are created with
``none_failed_min_one_success`` trigger rule such that they are skipped whenever their corresponding
branching tasks are skipped.
"""
from __future__ import annotations
import pendulum
from airflow.decorators import task
from airflow.models import DAG
from airflow.operators.empty import EmptyOperator
from airflow.utils.trigger_rule import TriggerRule
with DAG(
dag_id="example_nested_branch_dag",
start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
catchup=False,
schedule="@daily",
tags=["example"],
) as dag:
@task.branch()
def branch(task_id_to_return: str) -> str:
return task_id_to_return
branch_1 = branch.override(task_id="branch_1")(task_id_to_return="true_1")
join_1 = EmptyOperator(task_id="join_1", trigger_rule=TriggerRule.NONE_FAILED_MIN_ONE_SUCCESS)
true_1 = EmptyOperator(task_id="true_1")
false_1 = EmptyOperator(task_id="false_1")
branch_2 = branch.override(task_id="branch_2")(task_id_to_return="true_2")
join_2 = EmptyOperator(task_id="join_2", trigger_rule=TriggerRule.NONE_FAILED_MIN_ONE_SUCCESS)
true_2 = EmptyOperator(task_id="true_2")
false_2 = EmptyOperator(task_id="false_2")
false_3 = EmptyOperator(task_id="false_3")
branch_1 >> true_1 >> join_1
branch_1 >> false_1 >> branch_2 >> [true_2, false_2] >> join_2 >> false_3 >> join_1
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