branch_labels

Example DAG demonstrating the usage of labels with different branches.

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 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