我有开始通过result = task.delay()芹菜任务，然后等待通过result.get(timeout=5)结果的API。我目前正在写一个性能测试，这确实经常执行此任务。它工作正常，我的本地机器上，但是当我们发展的VM内执行的显示怪异的行为。经过约90-92处决，result.get(timeout=5)超时，即使工作几毫秒之内成功。
它几乎好像结果进去的结果后端失踪。我使用的RabbitMQ作为两个方向消息代理：
celery_broker_url = pyamqp://guest@localhost//
celery_result_backend = rpc://
谁能给我就如何进一步调查此问题的提示？是否有可能检查结果传递到结果后台？该RabbitMQ的日志不显示任何条目：
-- Logs begin at Wed 2019-01-30 16:49:24 UTC, end at Thu 2019-01-31 14:01:46 UTC. --
-- No entries --
下面是情况下，完整的堆栈跟踪它可以帮助：
[2019-01-31 13:56:42,313] ERROR in app: Exception on /user/lmhsqs/register [POST]
Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-packages/celery/backends/async.py", line 255, in _wait_for_pending
on_interval=on_interval):
File "/usr/local/lib/python3.6/dist-packages/celery/backends/async.py", line 54, in drain_events_until
raise socket.timeout()
socket.timeout
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1982, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1614, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1517, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.6/dist-packages/flask/_compat.py", line 33, in reraise
raise value
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1612, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1598, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/usr/local/lib/python3.6/dist-packages/connexion/decorators/decorator.py", line 66, in wrapper
response = function(request)
File "/usr/local/lib/python3.6/dist-packages/connexion/decorators/validation.py", line 122, in wrapper
response = function(request)
File "/usr/local/lib/python3.6/dist-packages/connexion/decorators/validation.py", line 293, in wrapper
return function(request)
File "/usr/local/lib/python3.6/dist-packages/connexion/decorators/decorator.py", line 42, in wrapper
response = function(request)
File "/usr/local/lib/python3.6/dist-packages/connexion/decorators/parameter.py", line 219, in wrapper
return function(**kwargs)
File "/mynedata/lib/api/apicalls.py", line 73, in register_user
res_to_return = result.get(timeout=5)
File "/usr/local/lib/python3.6/dist-packages/celery/result.py", line 224, in get
on_message=on_message,
File "/usr/local/lib/python3.6/dist-packages/celery/backends/async.py", line 188, in wait_for_pending
for _ in self._wait_for_pending(result, **kwargs):
File "/usr/local/lib/python3.6/dist-packages/celery/backends/async.py", line 259, in _wait_for_pending
raise TimeoutError('The operation timed out.')
celery.exceptions.TimeoutError: The operation timed out.
127.0.0.1 - - [2019-01-31 13:56:42] "POST /user/lmhsqs/register HTTP/1.1" 500 388 5.050726
[2019-01-31 13:56:47,374] ERROR in app: Exception on /user/lmhsqs/login [POST]
Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-packages/celery/backends/async.py", line 255, in _wait_for_pending
on_interval=on_interval):
File "/usr/local/lib/python3.6/dist-packages/celery/backends/async.py", line 54, in drain_events_until
raise socket.timeout()
socket.timeout
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1982, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1614, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1517, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.6/dist-packages/flask/_compat.py", line 33, in reraise
raise value
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1612, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1598, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/usr/local/lib/python3.6/dist-packages/connexion/decorators/decorator.py", line 66, in wrapper
response = function(request)
File "/usr/local/lib/python3.6/dist-packages/connexion/decorators/validation.py", line 122, in wrapper
response = function(request)
File "/usr/local/lib/python3.6/dist-packages/connexion/decorators/validation.py", line 293, in wrapper
return function(request)
File "/usr/local/lib/python3.6/dist-packages/connexion/decorators/decorator.py", line 42, in wrapper
response = function(request)
File "/usr/local/lib/python3.6/dist-packages/connexion/decorators/parameter.py", line 219, in wrapper
return function(**kwargs)
File "/mynedata/lib/api/apicalls.py", line 123, in login_user
res = result.get(timeout=5)
File "/usr/local/lib/python3.6/dist-packages/celery/result.py", line 224, in get
on_message=on_message,
File "/usr/local/lib/python3.6/dist-packages/celery/backends/async.py", line 188, in wait_for_pending
for _ in self._wait_for_pending(result, **kwargs):
File "/usr/local/lib/python3.6/dist-packages/celery/backends/async.py", line 259, in _wait_for_pending
raise TimeoutError('The operation timed out.')
celery.exceptions.TimeoutError: The operation timed out.
这个问题是不是与芹菜或RabbitMQ的，但完全无关：
我使用os.subprocess.Popen(shlex.split(backend_cmd), stdout=subprocess.PIPE, stderr=subprocess.STDOUT)开始芹菜工人。原来，subprocess.PIPE管将全面在某些时候（我觉得后2 ^ 16个字符），此时我的芹菜工人被困试图写管道，从而停笔结果结果后端。这意味着我看到的超时是有效的。
我不明白为什么result.status显示超时后“成功”虽然。