init: airflow_demo 初始化示例 DAG 集合

2026-10-13 14:14:04 +08:00
commit 69a1df7aa0
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+from datetime import datetime, timedelta
+from airflow import DAG
+from airflow.operators.python import PythonOperator
+from airflow.operators.bash import BashOperator
+
+# 默认参数定义
+default_args = {
+    'owner': 'xiaozhang',
+    'depends_on_past': False,
+    'email_on_failure': False,
+    "on_failure_callback":xx,
+    'retries': 1,
+    'retry_delay': timedelta(minutes=5),
+}
+
+# dag = DAG(
+#     dag_id='hello_world',
+#     default_args=default_args,
+#     start_date=datetime(2023, 1, 1),
+#     schedule_interval='@daily',
+#     catchup=False,
+#     tags= ["demo"]
+# )
+
+# 定义任务
+def print_hello():
+    print("Hello, World!")
+
+# 实例化DAG
+with DAG(
+    dag_id='hello_world',
+    default_args=default_args,
+    description="这个是一个样例",
+    start_date=datetime(2024, 10, 1),
+    schedule_interval='@daily',
+    catchup=True,
+    tags= ["demo","xiaozhang"]
+) as dag:
+
+    task1 = PythonOperator(
+        task_id='print_hello',
+        python_callable=print_hello
+    )
+
+    task2 = BashOperator(
+        task_id='run_bash_command',
+        bash_command='echo "This is a Bash command"',
+    )
+
+    # 定义依赖关系
+    task1 >> task2  # task2将在task1完成后执行
+    # task1.set_downstream(task2) # 这种写法也可以，但是不太推荐，因为不够直观