Question

我在tornado.ioloop工作者中使用celery因为我需要使用mongodb。

class WorkerBase():
    @gen.engine
    def foo(self,args,callback)
        bar = ['Python','Celery','Javascript','HTML']

        # ... process something ....

        callback(bar)

    @gen.engine
    def RunMyTask(self,args):

        result = yield gen.Task(self.foo,args=args)
        # Stop IOLoop instance
        IOLoop.instance().stop()


@task(name="MyWorker",base=WorkerBase)
def CeleryWorker(args):
    # This works because i'm adding base as WorkerBase
    CeleryWorker.RunMyTask(args)
    IOLoop.instance().start()
    return True

当我调用任务时，它会出错：

[2014-10-02 12:12:11,561: ERROR/Worker-4] Exception in callback None
Traceback (most recent call last):
    File "/var/www/myapp/env/local/lib/python2.7/site-packages/tornado/ioloop.py", line 832, in start
fd_obj, handler_func = self._handlers[fd]
KeyError: 16

或

[2014-10-02 12:12:11,561: ERROR/Worker-4] Exception in callback None
Traceback (most recent call last):
    File "/var/www/myapp/env/local/lib/python2.7/site-packages/tornado/ioloop.py", line 832, in start
fd_obj, handler_func = self._handlers[fd]
KeyError: 14

这些错误并不一致。是否有任何加薪条件？

Answer 1

这看起来像是一个线程问题。我不熟悉芹菜的线程模型，但看起来它正在启动CeleryWorker的多个副本，每个副本都试图运行相同的单例IOLoop.instance（）。如果您要像这样运行它，每个工作线程都需要自己的IOLoop - 查看同步tornado.httpclient.HTTPClient创建和运行临时IOLoop的内容

Answer 2

看起来你的工作任务只是在ioloop停止之前返回并被视为已完成，因此gen.engine的回调无法找到原始的stack_context。

@task(name="MyWorker",base=WorkerBase)
def CeleryWorker(args):
    # This works because i'm adding base as WorkerBase
    CeleryWorker.RunMyTask(args)
    IOLoop.instance().start()
    return True

我有一些建议

1）删除返回

@task(name="MyWorker",base=WorkerBase)
def CeleryWorker(args):
    # This works because i'm adding base as WorkerBase
    CeleryWorker.RunMyTask(args)
    IOLoop.instance().start()

2）使用run_sync

import functools

@task(name="MyWorker",base=WorkerBase)
def CeleryWorker(args):
    # This works because i'm adding base as WorkerBase
    func = functools.partial(CeleryWorker.RunMyTask, args)
    IOLoop.instance().run_sync(func)

回调中的Tornado IOLoop异常Celery worker中没有

2 个答案: