skip_dag

Example DAG demonstrating the DummyOperator and a custom DummySkipOperator which skips by default.

Airflow Fundamentals


Providers:

Run this DAG

1. Install Astronomer CLISkip if you already have the CLI

2. Initate the project:

3. Copy and paste the code below into a file in the

dags
directory.

4. Add the following to your requirements.txt file:

5. Run the DAG:

#
# Licensed to the Apache Software Foundation (ASF) under one
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# 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
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# software distributed under the License is distributed on an
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"""Example DAG demonstrating the DummyOperator and a custom DummySkipOperator which skips by default."""
from airflow import DAG
from airflow.exceptions import AirflowSkipException
from airflow.operators.dummy import DummyOperator
from airflow.utils.dates import days_ago
args = {
'owner': 'airflow',
}
# Create some placeholder operators
class DummySkipOperator(DummyOperator):
"""Dummy operator which always skips the task."""
ui_color = '#e8b7e4'
def execute(self, context):
raise AirflowSkipException
def create_test_pipeline(suffix, trigger_rule, dag_):
"""
Instantiate a number of operators for the given DAG.
:param str suffix: Suffix to append to the operator task_ids
:param str trigger_rule: TriggerRule for the join task
:param DAG dag_: The DAG to run the operators on
"""
skip_operator = DummySkipOperator(task_id=f'skip_operator_{suffix}', dag=dag_)
always_true = DummyOperator(task_id=f'always_true_{suffix}', dag=dag_)
join = DummyOperator(task_id=trigger_rule, dag=dag_, trigger_rule=trigger_rule)
final = DummyOperator(task_id=f'final_{suffix}', dag=dag_)
skip_operator >> join
always_true >> join
join >> final
with DAG(dag_id='example_skip_dag', default_args=args, start_date=days_ago(2), tags=['example']) as dag:
create_test_pipeline('1', 'all_success', dag)
create_test_pipeline('2', 'one_success', dag)