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 airflow import DAG
from airflow.operators.dummy import DummyOperator
from airflow.utils.dates import days_ago
from airflow.utils.edgemodifier import Label
with DAG("example_branch_labels", schedule_interval="@daily", start_date=days_ago(2)) 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