[rabbitmq-discuss] what would cause queue size to immediately go to 0?

Rob Harrop rob at rabbitmq.com
Fri Nov 5 15:22:43 GMT 2010

On 5 Nov 2010, at 14:52, Shane wrote:

> Thanks for the replies. It looks as though the messages are indeed all
> acknowledged but I'm still puzzled as to why since I haven't changed
> no_ack or QOS from their defaults.
> I'm using Spring AMQP and Java client 2.1.1. Where should I be setting
> or checking the settings mentioned?

Well, in Spring AMQP noAck is managed for you depending on how you consume the messages. 

Are you using one of the MessageListenerContainer implementations? Also, are you using transactions?

> On Nov 5, 9:56 am, Matthew Sackman <matt... at rabbitmq.com> wrote:
>> On Fri, Nov 05, 2010 at 01:33:38PM +0000, Marek Majkowski wrote:
>>> Please try using explicit acknowledgments, with no_ack=False
>>> and do acks manually using `basic_ack`
>> You might also need to use basic.qos to prevent the broker flooding the
>> client with msgs. But in general, this behaviour is "fine", provided
>> that's what you require in terms of behaviour of the consumers.
>> It's always worth looking at messages_ready (i.e. messages in the queue
>> which have not been delivered yet) and messages_unacknowledged (i.e.
>> messages which have been delivered by the queue for which no
>> acknowledgement has been received yet), to see quite what's going on.
>> (The "messages" field is the sum of those two).
>> Matthew
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