气流：如何扩展SubDagOperator？

本文介绍了气流：如何扩展SubDagOperator？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

当我尝试扩展airflow API中提供的SubDagOperator时，气流Web服务器GUI无法将其识别为SubDagOperator，从而使我无法放大到subdag。

When I try to extend the SubDagOperator provided in airflow API, airflow webserver GUI does not recognize it as SubDagOperator thereby disabling me to zoom in to the subdag.

如何我可以在扩展SubDagOperator的同时保留将其放大为subdag的功能吗？我缺少什么吗？

How can I extend the SubDagOperator while preserving the ability to zoom in to it as a subdag? Am I missing something?

推荐答案

请参见下面的示例，了解如何扩展SubDagOperator。您的案例中的关键是覆盖task_type函数

Please see the example below on how to extend the SubDagOperator. The key in your case was to override the task_type function

from airflow import DAG from airflow.operators.subdag_operator import SubDagOperator from airflow.operators.dummy_operator import DummyOperator from airflow.utils.decorators import apply_defaults class ExampleSubdagSubclassOperator(SubDagOperator): template_fields = () template_ext = () @apply_defaults def __init__(self, *args, **kwargs): dag = kwargs.get('dag') task_id = kwargs.get('task_id') subdag = DAG( '{}.{}'.format(dag.dag_id, task_id), schedule_interval=dag.schedule_interval, start_date=dag.start_date ) # Replace the following 3 lines with code to automatically generate the desired tasks in the subdag t1 = DummyOperator(dag=subdag, task_id='t1') t2 = DummyOperator(dag=subdag, task_id='t2') t3 = DummyOperator(dag=subdag, task_id='t3') super(ExampleSubdagSubclassOperator, self).__init__(subdag=subdag, *args, **kwargs) # This property needs to be overridden so that the airflow UI recognises the task as a subdag and enables # the "Zoom into Sub Dag" button @property def task_type(self): return 'SubDagOperator'