Producer can not be started in UWSGI, and raises a rocketmq.exceptions.ProducerStartFailed

My application is deveplped with Django which provides a Web API service and runs over UWSGI. The real code is as follows:

mq_locals = {}

def get_producer() -> Producer:
    if 'producer' not in mq_locals:
        producer = Producer('XXX')
        producer.set_namesrv_addr(settings.ODMS_CONFIG['name_server'])  # pylint: disable=E1101
        producer.start()

        mq_locals['producer'] = producer

    return mq_locals['producer']

But the application raises a rocketmq.exceptions.ProducerStartFailed: boost::thread_resource_error: Resource temporarily unavailable when the get_producer method is called.

The version of rocketmq-client-python and rocketmq are 2.0.0 and 0.4.4 respectively. And the OS is Ubuntu. The Detailed log is as follows.

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/lib/python3.7/site-packages/django/views/decorators/http.py", line 40, in inner
    return func(request, *args, **kwargs)
  File "/dc_utils3/dc_account_md/decorators.py", line 29, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "./odms/views/submission_approve.py", line 64, in submission_approve
    send_approve_message(submission.archive_id, mq_srv.APPROVE_STATUS_YES, comment)
  File "./odms/views/submission_approve.py", line 74, in send_approve_message
    mq_srv.send_approve_message(archive_id, approve_status, comment)
  File "./odms/services/mq.py", line 58, in send_approve_message
    echo_producer = get_producer()
  File "./odms/services/mq.py", line 30, in get_producer
    producer.start()
  File "/usr/local/lib/python3.7/site-packages/rocketmq/client.py", line 329, in start
    ffi_check(dll.StartProducer(self._handle))
  File "/usr/local/lib/python3.7/site-packages/rocketmq/exceptions.py", line 27, in ffi_check
    raise exc_cls(msg)
rocketmq.exceptions.ProducerStartFailed: boost::thread_resource_error: Resource temporarily unavailable

In addition, the get_producer method is call normally in Django console.

apache / rocketmq-client-python

Producer can not be started in UWSGI, and raises a rocketmq.exceptions.ProducerStartFailed #140