• Celery ValueError: not enough values to unpack (expected 3, got 0)的解决方案


    Celery ValueError: not enough values to unpack (expected 3, got 0)的解决方案

    背景

    最近因项目需要,学习任务队列Celery的用法,跟着官网写Demo,出现如题错误,最终在github的Issues里找到解决办法,记录如下。

    场景还原

    本地环境如下:

    • Windows 10
    • Python 3.5.2
    • Celery 4.1.0

    我是跟着这个前人翻译的中文文档敲的Demo。

    代码tasks.py

    from celery import Celery
    
    app = Celery('tasks', broker='redis://:xxxx@xxx.xxx.xxx.xx:6379/0')
    
    @app.task
    def add(x, y):
        return x + y1234567
    

    执行worker

    celery -A tasks worker --loglevel=info1
    

    输出:

     -------------- celery@kong9wei11 v4.1.0 (latentcall)
    ---- **** -----
    --- * ***  * -- Windows-10-10.0.14393-SP0 2018-01-12 19:01:39
    -- * - **** ---
    - ** ---------- [config]
    - ** ---------- .> app:         tasks:0x157fd248550
    - ** ---------- .> transport:   redis://:**@114.67.225.0:6379/0
    - ** ---------- .> results:     disabled://
    - *** --- * --- .> concurrency: 4 (prefork)
    -- ******* ---- .> task events: OFF (enable -E to monitor tasks in this worker)
    --- ***** -----
     -------------- [queues]
                    .> celery           exchange=celery(direct) key=celery
    
    
    [tasks]
      . tasks.add
    
    [2018-01-12 19:01:40,029: INFO/MainProcess] Connected to redis://:**@114.67.225.0:6379/0
    [2018-01-12 19:01:40,130: INFO/MainProcess] mingle: searching for neighbors
    [2018-01-12 19:01:40,550: INFO/SpawnPoolWorker-1] child process 9048 calling self.run()
    [2018-01-12 19:01:40,557: INFO/SpawnPoolWorker-2] child process 9028 calling self.run()
    [2018-01-12 19:01:40,578: INFO/SpawnPoolWorker-3] child process 13064 calling self.run()
    [2018-01-12 19:01:40,611: INFO/SpawnPoolWorker-4] child process 9856 calling self.run()
    [2018-01-12 19:01:41,693: INFO/MainProcess] mingle: all alone
    [2018-01-12 19:01:42,212: INFO/MainProcess] celery@xx ready.1234567891011121314151617181920212223242526
    

    调用任务代码manager.py

    from tasks import add
    
    add.delay(4, 4)123
    

    执行

    python manager.py1
    

    然后worker里报错:

    [2018-01-12 19:08:15,545: INFO/MainProcess] Received task: tasks.add[5d387722-5389-441b-9b01-a619b93b4702]
    [2018-01-12 19:08:15,550: ERROR/MainProcess] Task handler raised error: ValueError('not enough values to unpack (expected 3, got 0)',)
    Traceback (most recent call last):
      File "d:programmingsoftwarepython35libsite-packagesilliardpool.py", line 358, in workloop
        result = (True, prepare_result(fun(*args, **kwargs)))
      File "d:programmingsoftwarepython35libsite-packagesceleryapp	race.py", line 525, in _fast_trace_task
        tasks, accept, hostname = _loc
    ValueError: not enough values to unpack (expected 3, got 0)12345678
    

    解决:

    原网页:Unable to run tasks under Windows

    看别人描述大概就是说win10上运行celery4.x就会出现这个问题,解决办法如下,原理未知:

    先安装一个``eventlet`

    pip install eventlet1
    

    然后启动worker的时候加一个参数,如下:

    celery -A <mymodule> worker -l info -P eventlet1
    

    然后就可以正常的调用了。

    运行

    python manage.py1
    

    worker里输出:

    [2018-01-12 19:35:33,640: INFO/MainProcess] Received task: tasks.add[3f9b5255-60a2-4a08-96b6-38f5fbc31543]
    [2018-01-12 19:35:33,640: INFO/MainProcess] Task tasks.add[3f9b5255-60a2-4a08-96b6-38f5fb
    
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  • 原文地址:https://www.cnblogs.com/wenqiangit/p/10577345.html
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