Windows下执行celery4.1 报错Task handler raised error: ValueError('not enough values to unpack (expected 3, got 0)',)

 错误信息如下所示,根据网上查找发现celery4版本起已经不支持windows了，所以会报此错误，解决方法

1 如果要用windows来实现的话，请降低版本到3版本

2 可以用linux系统   linux系统支持4.1版本，不会发生如下错误

 

from celery import Celery
 
app = Celery('tasks',
             broker='redis://localhost',
             backend='redis://localhost')
 
@app.task
def add(x,y):
    print("running...",x,y)
    return x+y

 

 windows下报错信息如下

[2018-01-10 14:23:01,932: INFO/MainProcess] Received task: task.add[4d68d561-e835-4592-a4d4-0f4799700df8]
[2018-01-10 14:23:01,951: ERROR/MainProcess] Task handler raised error: ValueError('not enough values to unpack (expected 3, got 0)',)
Traceback (most recent call last):
  File "d:\program files (x86)\python\python36\lib\site-packages\billiard\pool.py", line 358, in workloop
    result = (True, prepare_result(fun(*args, **kwargs)))
  File "d:\program files (x86)\python\python36\lib\site-packages\celery\app\trace.py", line 525, in _fast_trace_task
    tasks, accept, hostname = _loc
ValueError: not enough values to unpack (expected 3, got 0)
[2018-01-10 14:25:54,285: INFO/MainProcess] Received task: task.add[e0593045-acb4-414d-ab6e-45ac7b636084]
[2018-01-10 14:25:57,287: ERROR/MainProcess] Task handler raised error: ValueError('not enough values to unpack (expected 3, got 0)',)
Traceback (most recent call last):
  File "d:\program files (x86)\python\python36\lib\site-packages\billiard\pool.py", line 358, in workloop
    result = (True, prepare_result(fun(*args, **kwargs)))
  File "d:\program files (x86)\python\python36\lib\site-packages\celery\app\trace.py", line 525, in _fast_trace_task
    tasks, accept, hostname = _loc
ValueError: not enough values to unpack (expected 3, got 0)
[2018-01-10 14:42:36,239: INFO/MainProcess] Received task: task.add[be45c703-b833-44c5-8f4f-7c81bbcc2cf0]
[2018-01-10 14:42:36,253: ERROR/MainProcess] Task handler raised error: ValueError('not enough values to unpack (expected 3, got 0)',)

 

 

Centos 7下使用celery4.1可以正常执行

客户端

[python@qinhan file]$ python
Python 3.6.2 (default, Jan 10 2018, 16:15:47) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-16)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from task import add
>>> add.delay(5,7)
<AsyncResult: 598a600d-7b49-4ba4-8d7b-85692027b46d>
>>> 

 

Celery端

[root@qinhan file]# celery -A task worker --loglevel=info
/usr/local/python3/lib/python3.6/site-packages/celery/platforms.py:795: RuntimeWarning: You're running the worker with superuser privileges: this is
absolutely not recommended!

Please specify a different user using the -u option.

User information: uid=0 euid=0 gid=0 egid=0

  uid=uid, euid=euid, gid=gid, egid=egid,
 
 -------------- celery@qinhan v4.1.0 (latentcall)
---- **** ----- 
--- * ***  * -- Linux-3.10.0-327.el7.x86_64-x86_64-with-centos-7.2.1511-Core 2018-01-11 16:59:47
-- * - **** --- 
- ** ---------- [config]
- ** ---------- .> app:         tasks:0x7f4262d718d0
- ** ---------- .> transport:   redis://localhost:6379//
- ** ---------- .> results:     redis://localhost/
- *** --- * --- .> concurrency: 4 (prefork)
-- ******* ---- .> task events: OFF (enable -E to monitor tasks in this worker)
--- ***** ----- 
 -------------- [queues]
                .> celery           exchange=celery(direct) key=celery
                

[tasks]
  . task.add

[2018-01-11 16:59:47,385: INFO/MainProcess] Connected to redis://localhost:6379//
[2018-01-11 16:59:47,403: INFO/MainProcess] mingle: searching for neighbors
[2018-01-11 16:59:48,444: INFO/MainProcess] mingle: all alone
[2018-01-11 16:59:48,465: INFO/MainProcess] celery@qinhan ready.
[2018-01-11 17:06:57,465: INFO/MainProcess] Received task: task.add[598a600d-7b49-4ba4-8d7b-85692027b46d]  
[2018-01-11 17:06:57,472: WARNING/ForkPoolWorker-1] running...
[2018-01-11 17:06:57,473: WARNING/ForkPoolWorker-1] 5
[2018-01-11 17:06:57,474: WARNING/ForkPoolWorker-1] 7
[2018-01-11 17:06:57,490: INFO/ForkPoolWorker-1] Task task.add[598a600d-7b49-4ba4-8d7b-85692027b46d] succeeded in 0.018820124001649674s: 12