Source code for airflow.example_dags.example_branch_labels

# 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
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# 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 labels with different branches.
from datetime import datetime

from airflow import DAG
from airflow.operators.dummy import DummyOperator
from airflow.utils.edgemodifier import Label

with DAG(
    "example_branch_labels", schedule_interval="@daily", start_date=datetime(2021, 1, 1), catchup=False
) as dag:
    ingest = DummyOperator(task_id="ingest")
    analyse = DummyOperator(task_id="analyze")
    check = DummyOperator(task_id="check_integrity")
    describe = DummyOperator(task_id="describe_integrity")
    error = DummyOperator(task_id="email_error")
    save = DummyOperator(task_id="save")
    report = DummyOperator(task_id="report")

    ingest >> analyse >> check
    check >> Label("No errors") >> save >> report
    check >> Label("Errors found") >> describe >> error >> report

Was this entry helpful?