airflow example_sla_dag 源码
airflow example_sla_dag 代码
文件路径：/airflow/example_dags/example_sla_dag.py
# 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 SLA use in Tasks"""
from __future__ import annotations
import datetime
import time
import pendulum
from airflow.decorators import dag, task
# [START howto_task_sla]
def sla_callback(dag, task_list, blocking_task_list, slas, blocking_tis):
print(
"The callback arguments are: ",
{
"dag": dag,
"task_list": task_list,
"blocking_task_list": blocking_task_list,
"slas": slas,
"blocking_tis": blocking_tis,
},
)
@dag(
schedule="*/2 * * * *",
start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
catchup=False,
sla_miss_callback=sla_callback,
default_args={'email': "email@example.com"},
)
def example_sla_dag():
@task(sla=datetime.timedelta(seconds=10))
def sleep_20():
"""Sleep for 20 seconds"""
time.sleep(20)
@task
def sleep_30():
"""Sleep for 30 seconds"""
time.sleep(30)
sleep_20() >> sleep_30()
example_dag = example_sla_dag()
# [END howto_task_sla]
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