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IndexError: pop from an empty deque

See original GitHub issue

Traceback (most recent call last):
  File "./tracer.py", line 223, in <module>
    proc.run()
  File "./tracer.py", line 133, in run
    self._connection.ioloop.start()
  File "/usr/lib/python2.6/site-packages/pika/adapters/select_connection.py", line 138, in start
    self.poller.start()
  File "/usr/lib/python2.6/site-packages/pika/adapters/select_connection.py", line 433, in start
    self.poll()
  File "/usr/lib/python2.6/site-packages/pika/adapters/select_connection.py", line 494, in poll
    self._handler(fileno, event, write_only=write_only)
  File "/usr/lib/python2.6/site-packages/pika/adapters/base_connection.py", line 318, in _handle_events
    self._handle_write()
  File "/usr/lib/python2.6/site-packages/pika/adapters/base_connection.py", line 358, in _handle_write
    frame = self.outbound_buffer.popleft()
IndexError: pop from an empty deque

Sometimes it arises from additional thread

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib64/python2.6/threading.py", line 532, in __bootstrap_inner
    self.run()
  File "/usr/lib64/python2.6/threading.py", line 484, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib/python2.6/site-packages/unirest/__init__.py", line 102, in __request
    callback(_unirestResponse)
  File "./tracer.py", line 176, in put_jobs_in_queue
    self.publish(ip)
  File "./tracer.py", line 98, in publish
    self._w_channel.basic_publish(exchange='', routing_key=self.W_QUEUE_NAME, body=message)
  File "/usr/lib/python2.6/site-packages/pika/channel.py", line 300, in basic_publish
    (properties, body))
  File "/usr/lib/python2.6/site-packages/pika/channel.py", line 1057, in _send_method
    self.connection._send_method(self.channel_number, method_frame, content)
  File "/usr/lib/python2.6/site-packages/pika/connection.py", line 1503, in _send_method
    self._send_frame(frame.Method(channel_number, method_frame))
  File "/usr/lib/python2.6/site-packages/pika/connection.py", line 1490, in _send_frame
    self._flush_outbound()
  File "/usr/lib/python2.6/site-packages/pika/adapters/select_connection.py", line 77, in _flush_outbound
    self.ioloop.poller.poll(write_only=True)
  File "/usr/lib/python2.6/site-packages/pika/adapters/select_connection.py", line 494, in poll
    self._handler(fileno, event, write_only=write_only)
  File "/usr/lib/python2.6/site-packages/pika/adapters/base_connection.py", line 318, in _handle_events
    self._handle_write()
  File "/usr/lib/python2.6/site-packages/pika/adapters/base_connection.py", line 358, in _handle_write
    frame = self.outbound_buffer.popleft()
IndexError: pop from an empty deque

self._w_channel it is channel, where 1 client publish, and 100+ clients consuming

Why this error is arises and what i can do with it?

Version of pika 0.9.14

Issue Analytics

State:
Created 9 years ago
Comments:12 (3 by maintainers)

Top GitHub Comments

1reaction

viniciusdcommented, Oct 13, 2020

I found this thread because I am having the same error with an expanded version of the basic consumer threaded example. But it is probably because I am sharing an outbound channel together with the connection itself (I am debugging it literally now)

1reaction

viniciusdcommented, Oct 13, 2020

Not sure I follow you here, there is an example of a basic threaded consumer that shares the connection object with the thread: https://github.com/pika/pika/blob/0.12.0/examples/basic_consumer_threaded.py

It isn’t supported even though there is an official example using it?

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