python - Pythonでrabbitmqを使用しているときに「pika.exceptions.ConnectionClosed」エラーが発生する

Question

http://www.rabbitmq.com/tutorials/tutorial-two-python.htmlの「hello world」チュートリアルを使用しています。 worker.pyこのように見えます

import pika
import time


connection = pika.BlockingConnection(pika.ConnectionParameters(
        host='localhost'))
channel = connection.channel()

channel.queue_declare(queue='task_queue', durable=True)
print ' [*] Waiting for messages. To exit press CTRL+C'

def callback(ch, method, properties, body):
    print " [x] Received %r" % (body,)
    time.sleep( body.count('.') )
    print " [x] Done"
    ch.basic_ack(delivery_tag = method.delivery_tag)

channel.basic_qos(prefetch_count=1)
channel.basic_consume(callback,
                      queue='task_queue')

channel.start_consuming()

このコードを使用して、仕事に実装しました。印刷後に例外が発生するキュー内のポイントが来るまで、すべてがスムーズに機能します[x] Done

Traceback (most recent call last):
  File "hullworker2.py", line 242, in <module>
    channel.basic_consume(callback,queue='test_queue2')
  File "/usr/local/lib/python2.7/dist-packages/pika/channel.py", line 211, in basic_consume
    {'consumer_tag': consumer_tag})])
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 904, in _rpc
    self.connection.process_data_events()
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 88, in process_data_events
    if self._handle_read():
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 184, in _handle_read
    super(BlockingConnection, self)._handle_read()
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/base_connection.py", line 300, in _handle_read
    return self._handle_error(error)
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/base_connection.py", line 264, in _handle_error
    self._handle_disconnect()
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 181, in _handle_disconnect
    self._on_connection_closed(None, True)
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 232, in _on_connection_closed
    self._channels[channel]._on_close(method_frame)
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 817, in _on_close
    self._send_method(spec.Channel.CloseOk(), None, False)
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 920, in _send_method
    self.connection.send_method(self.channel_number, method_frame, content)
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 120, in send_method
    self._send_method(channel_number, method_frame, content)
  File "/usr/local/lib/python2.7/dist-packages/pika/connection.py", line 1331, in _send_method
    self._send_frame(frame.Method(channel_number, method_frame))
  File "/usr/local/lib/python2.7/dist-packages/pika/adapters/blocking_connection.py", line 245, in _send_frame
    super(BlockingConnection, self)._send_frame(frame_value)
  File "/usr/local/lib/python2.7/dist-packages/pika/connection.py", line 1312, in _send_frame
    raise exceptions.ConnectionClosed
pika.exceptions.ConnectionClosed

プロセス間で接続が自動的に閉じられる方法がわかりません。キュー内の数百のメッセージに対してプロセスが正常に実行された後、突然このエラーが発生します。どんな助けでも感謝します。