[rabbitmq-discuss] queue gets removed from a node

Tue Aug 30 15:42:39 BST 2011

Is the queue set to be durable?

On Tue, Aug 30, 2011 at 6:50 AM, Matthew Sackman <matthew at rabbitmq.com>wrote:

> Hi Cezary,
>
> On Thu, Aug 25, 2011 at 01:09:47PM +0100, Cezary Siwek wrote:
> > I'm facing an issue with my rabittmq cluster where a queue
> > disappears from a node.
> > I have 2 nodes in a cluster working in "disk mode".
> > Node1 - only consumes messages from the queue.
> > Node2 - only publishes messages to the queue.
> >
> > The consumer script on Node1 creates a durable queue and waits for
> > messages.
> > Everything works fine until some no-activity time. I can't say how
> > long it needs to be but usually after more than 24h the queue
> > disappears from Node2 and the consumer stops receiving messages. The
> > list_queues command shows the queue exists on Node1 but not on
> > Node2.
> > I've done a packet trace when it happened and I can see some packets
> > are being exchanged between nodes. Also cluster_status commands
> > shows that both nodes are up and running in the cluster.
> > When I try to declare_queue on the Node2 i get 'NOT_FOUND - no queue
> > 'msgs' in vhost '/vhost1'.
> > All I need to do to have the Node2 running is to run stop_app and
> start_app.
> >
> > Both nodes are sitting behind firewalls (in separate networks) but
> > both firewalls have been granted to pass all the traffic between
> > these two boxes.
> > It happens on my dev platfrom. On production I don't think I will
> > ever have such long quiet periods but I need to find out what is
> > causing this.
>
> Hmm, this is odd. It suggests that the two nodes have lost contact with
> each other which is why Node2 is responding with the NOT_FOUND when you
> try to redeclare the queue. However, if at this point the cluster_status
> on both nodes is suggesting everything is clustered and happy, then this
> is very odd indeed. Could you check that you can achieve these sets of
> circumstances?
>
> Also, do you have the logs for both nodes during the no-activity time?
> I'm curious whether there are entries in there that suggest the cluster
> has split apart. If they're large, then maybe send them to us off-list.
>
> Matthew
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