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Add NONE_FAILED_OR_SKIPPED trigger_rule
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# | ||
# 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. | ||
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""" | ||
Example DAG demonstrating a workflow with nested branching. The join tasks are created with | ||
``none_failed_or_skipped`` trigger rule such that they are skipped whenever their corresponding | ||
``BranchPythonOperator`` are skipped. | ||
""" | ||
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from airflow.models import DAG | ||
from airflow.operators.dummy_operator import DummyOperator | ||
from airflow.operators.python import BranchPythonOperator | ||
from airflow.utils.dates import days_ago | ||
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with DAG(dag_id="example_nested_branch_dag", start_date=days_ago(2), schedule_interval="@daily") as dag: | ||
branch_1 = BranchPythonOperator(task_id="branch_1", python_callable=lambda: "true_1") | ||
join_1 = DummyOperator(task_id="join_1", trigger_rule="none_failed_or_skipped") | ||
true_1 = DummyOperator(task_id="true_1") | ||
false_1 = DummyOperator(task_id="false_1") | ||
branch_2 = BranchPythonOperator(task_id="branch_2", python_callable=lambda: "true_2") | ||
join_2 = DummyOperator(task_id="join_2", trigger_rule="none_failed_or_skipped") | ||
true_2 = DummyOperator(task_id="true_2") | ||
false_2 = DummyOperator(task_id="false_2") | ||
false_3 = DummyOperator(task_id="false_3") | ||
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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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