Error “unknown delivery tag” occurs when i try ack messages to RabbitMQ using pika (python)

Question

I want process messages in few threads but i\'m getting error during execute this code:

from __future__ import with_statement
import pika
import sys
from pika.ad         


        

Answer 1

After seeing RabbitMQ - upgraded to a new version and got a lot of "PRECONDITION_FAILED unknown delivery tag 1"

I changed my basic-consume to look like this:

    consumer_tag = channel.basic_consume(
        message_delivery_event,
        no_ack=True,
        queue=queue,
    )

This had the effect of causing the described error on initial (not redelivered) acknowledgements when the message's delivery tag was specified. The delivery was extracted from the message delivery's method structure.

Using

    channel.basic_ack(delivery_tag=0)

suppresses the error in this case, too

Looking at http://lists.rabbitmq.com/pipermail/rabbitmq-discuss/2011-July/013664.html makes it seem as though it may be an issue in RabbitMQ.