Windows 에서 celery 실행시 오류 해결 방안

Windows10 에서 Celery를 사용하기 위해서 pip로 celery 설치하여 실행하니 아래와 같이 오류가 발생 하였습니다.

(celery_venv) D:\10.workspace\python_study\celery_study>celery -A tasks worker --loglevel=info -------------- celery@NC0201041 v4.0.2 (latentcall) ---- **** ----- --- * *** * -- Windows-10-10.0.14393-SP0 2017-06-28 10:54:37 -- * - **** --- - ** ---------- [config] - ** ---------- .> app: tasks:0x1dd92b34b00 - ** ---------- .> transport: redis://localhost:6379/0 - ** ---------- .> results: redis://localhost:6379/0 - *** --- * --- .> concurrency: 4 (prefork) -- ******* ---- .> task events: OFF (enable -E to monitor tasks in this worker) --- ***** ----- -------------- [queues] .> celery exchange=celery(direct) key=celery [tasks] . tasks.add [2017-06-28 10:54:37,124: CRITICAL/MainProcess] Unrecoverable error: AttributeError("Can't pickle local object 'Pool.__init__.<locals>.Process'",) Traceback (most recent call last): File "d:\10.workspace\python_study\celery_study\celery_venv\lib\site-packages\celery\worker\worker.py", line 203, in start self.blueprint.start(self) File "d:\10.workspace\python_study\celery_study\celery_venv\lib\site-packages\celery\bootsteps.py", line 119, in start step.start(parent) File "d:\10.workspace\python_study\celery_study\celery_venv\lib\site-packages\celery\bootsteps.py", line 370, in start return self.obj.start() File "d:\10.workspace\python_study\celery_study\celery_venv\lib\site-packages\celery\concurrency\base.py", line 131, in start self.on_start() File "d:\10.workspace\python_study\celery_study\celery_venv\lib\site-packages\celery\concurrency\prefork.py", line 112, in on_start **self.options) File "d:\10.workspace\python_study\celery_study\celery_venv\lib\site-packages\billiard\pool.py", line 1008, in __init__ self._create_worker_process(i) File "d:\10.workspace\python_study\celery_study\celery_venv\lib\site-packages\billiard\pool.py", line 1117, in _create_worker_process w.start() File "d:\10.workspace\python_study\celery_study\celery_venv\lib\site-packages\billiard\process.py", line 122, in start self._popen = self._Popen(self) File "d:\10.workspace\python_study\celery_study\celery_venv\lib\site-packages\billiard\context.py", line 383, in _Popen return Popen(process_obj) File "d:\10.workspace\python_study\celery_study\celery_venv\lib\site-packages\billiard\popen_spawn_win32.py", line 79, in __init__ reduction.dump(process_obj, to_child) File "d:\10.workspace\python_study\celery_study\celery_venv\lib\site-packages\billiard\reduction.py", line 99, in dump ForkingPickler(file, protocol).dump(obj) AttributeError: Can't pickle local object 'Pool.__init__.<locals>.Process' (celery_venv) D:\10.workspace\python_study\celery_study>Traceback (most recent call last): File "<string>", line 1, in <module> File "d:\10.workspace\python_study\celery_study\celery_venv\lib\site-packages\billiard\spawn.py", line 159, in spawn_main new_handle = steal_handle(parent_pid, pipe_handle) File "d:\10.workspace\python_study\celery_study\celery_venv\lib\site-packages\billiard\reduction.py", line 126, in steal_handle _winapi.DUPLICATE_SAME_ACCESS | _winapi.DUPLICATE_CLOSE_SOURCE) PermissionError: [WinError 5] 액세스가 거부되었습니다

구글링해서 찾은 결과, 3.1.25 버전에서는 정상 동작한다고 하여 설치된 버전(4.0.2)을 삭제하고 3.1.25 버전을 설치하여 정상동작을 확인 하였습니다.

pip로 모듈을 삭제하고 설치할 모듈의 버전을 지정하는 것은 아래처럼 하면 됩니다. 

- celery 삭제

pip uninstall celery

- celery 3.1.25 버전 설치

pip install celery==3.1.25

참고자료

https://www.reddit.com/r/learnpython/comments/699ezv/getting_celery_to_run_on_windows/