[rabbitmq-discuss] Strange behaviour of RabbitMQ or client when network problems occurs

Fri Sep 13 07:28:26 BST 2013

On 13/09/13 07:03, Haster wrote:
> why after such problems order of messages changes?
> For example I send 1,2,3,4,5 messages (prefetch count is 20) and on 6
> message I have problem...

By "problem" do you mean the client disconnects and reconnects?

And when you reconnect, has rabbitmq definitely seen the old connection 
disappear? Check the server logs for the sequencing of the 
connect/disconnect events.

> After network problem the next processed message is 25, but not 6.
> RabbitMQ paste unack message to the end of a queue?

Not in recent versions. though there are some caveats. See 
http://www.rabbitmq.com/semantics.html#ordering

If you have a scenario where you think the ordering semantics defined on 
that page is violated, then capture a trace with the RabbitMQ protocol 
tracer (http://www.rabbitmq.com/api-guide.html#tracer), inspect the 
output, and if after that you still think there is a problem then post 
the trace here.

Matthias.