kaxil opened a new pull request #16700: URL: https://github.com/apache/airflow/pull/16700
closes https://github.com/apache/airflow/issues/16326 Currently when running celery tasks when running with ``CeleryKubernetesExecutor``, we see the following error. This error occurs as the ``BaseJob`` (via ``LocalTaskJob``) tries to needlessly instantiate a `KubernetesExecutor` which in turn tries to create a multiprocessing process/Manager which fails. ``` [2021-06-29 00:23:45,301: ERROR/ForkPoolWorker-16] Failed to execute task daemonic processes are not allowed to have children. Traceback (most recent call last): File "/home/airflow/.local/lib/python3.6/site-packages/airflow/executors/celery_executor.py", line 116, in _execute_in_fork args.func(args) File "/home/airflow/.local/lib/python3.6/site-packages/airflow/cli/cli_parser.py", line 48, in command return func(*args, **kwargs) File "/home/airflow/.local/lib/python3.6/site-packages/airflow/utils/cli.py", line 91, in wrapper return f(*args, **kwargs) File "/home/airflow/.local/lib/python3.6/site-packages/airflow/cli/commands/task_command.py", line 237, in task_run _run_task_by_selected_method(args, dag, ti) File "/home/airflow/.local/lib/python3.6/site-packages/airflow/cli/commands/task_command.py", line 64, in _run_task_by_selected_method _run_task_by_local_task_job(args, ti) File "/home/airflow/.local/lib/python3.6/site-packages/airflow/cli/commands/task_command.py", line 117, in _run_task_by_local_task_job pool=args.pool, File "<string>", line 4, in __init__ File "/home/airflow/.local/lib/python3.6/site-packages/sqlalchemy/orm/state.py", line 433, in _initialize_instance manager.dispatch.init_failure(self, args, kwargs) File "/home/airflow/.local/lib/python3.6/site-packages/sqlalchemy/util/langhelpers.py", line 70, in __exit__ with_traceback=exc_tb, File "/home/airflow/.local/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 182, in raise_ raise exception File "/home/airflow/.local/lib/python3.6/site-packages/sqlalchemy/orm/state.py", line 430, in _initialize_instance return manager.original_init(*mixed[1:], **kwargs) File "/home/airflow/.local/lib/python3.6/site-packages/airflow/jobs/local_task_job.py", line 76, in __init__ super().__init__(*args, **kwargs) File "<string>", line 6, in __init__ File "/home/airflow/.local/lib/python3.6/site-packages/airflow/jobs/base_job.py", line 97, in __init__ self.executor = executor or ExecutorLoader.get_default_executor() File "/home/airflow/.local/lib/python3.6/site-packages/airflow/executors/executor_loader.py", line 62, in get_default_executor cls._default_executor = cls.load_executor(executor_name) File "/home/airflow/.local/lib/python3.6/site-packages/airflow/executors/executor_loader.py", line 79, in load_executor return cls.__load_celery_kubernetes_executor() File "/home/airflow/.local/lib/python3.6/site-packages/airflow/executors/executor_loader.py", line 116, in __load_celery_kubernetes_executor kubernetes_executor = import_string(cls.executors[KUBERNETES_EXECUTOR])() File "/home/airflow/.local/lib/python3.6/site-packages/airflow/executors/kubernetes_executor.py", line 421, in __init__ self._manager = multiprocessing.Manager() File "/usr/local/lib/python3.6/multiprocessing/context.py", line 56, in Manager m.start() File "/usr/local/lib/python3.6/multiprocessing/managers.py", line 513, in start self._process.start() File "/usr/local/lib/python3.6/multiprocessing/process.py", line 103, in start 'daemonic processes are not allowed to have children' AssertionError: daemonic processes are not allowed to have children ``` We don't need to instantiate an executor when running ``LocalTaskJob`` as executor isn't used in it. <!-- Thank you for contributing! Please make sure that your code changes are covered with tests. And in case of new features or big changes remember to adjust the documentation. Feel free to ping committers for the review! In case of existing issue, reference it using one of the following: closes: #ISSUE related: #ISSUE How to write a good git commit message: http://chris.beams.io/posts/git-commit/ --> --- **^ Add meaningful description above** Read the **[Pull Request Guidelines](https://github.com/apache/airflow/blob/main/CONTRIBUTING.rst#pull-request-guidelines)** for more information. In case of fundamental code change, Airflow Improvement Proposal ([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)) is needed. In case of a new dependency, check compliance with the [ASF 3rd Party License Policy](https://www.apache.org/legal/resolved.html#category-x). In case of backwards incompatible changes please leave a note in [UPDATING.md](https://github.com/apache/airflow/blob/main/UPDATING.md). -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
