airflow example_branch_labels 源码
airflow example_branch_labels 代码
文件路径：/airflow/example_dags/example_branch_labels.py
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#
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"""
Example DAG demonstrating the usage of labels with different branches.
"""
from __future__ import annotations
import pendulum
from airflow import DAG
from airflow.operators.empty import EmptyOperator
from airflow.utils.edgemodifier import Label
with DAG(
"example_branch_labels",
schedule="@daily",
start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
catchup=False,
) as dag:
ingest = EmptyOperator(task_id="ingest")
analyse = EmptyOperator(task_id="analyze")
check = EmptyOperator(task_id="check_integrity")
describe = EmptyOperator(task_id="describe_integrity")
error = EmptyOperator(task_id="email_error")
save = EmptyOperator(task_id="save")
report = EmptyOperator(task_id="report")
ingest >> analyse >> check
check >> Label("No errors") >> save >> report
check >> Label("Errors found") >> describe >> error >> report
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