Hi, I am testing the cluster with HornetQ on JBoss5. (HornetQ2.1.2Final with JBossEAP5.1)

  Grouping message delivery in the cluster stops by closing and reconnecting of the consumer when I do setting of redistribution-delay (more than 0).

Procedure that delivery stops

1. A consumer is connected to each node of the cluster and receives the grouping message.
2. 
   Close a consumer connected to routed Queue of the grouping message.
   Then a grouping message is received with a consumer connected to the other nodes.
3. 
   Connect a consumer to routed Queue again.
   Grouping message comes to receive neither consumer.
   The CPU load of the node with routed Queue becomes 100%.

When a consumer is connected to routed Queue when grouping message is redistributed to other nodes, Redistributor (QueueImpl.redistributor) of routed Queue stops.
However, the grouping message gets a consumer (Redistributor) from a group consumer (QueueImpl.groups) and is going to deliver it.
it is not delivered.（Because Redistributor has stopped, the status of QueueImpl.handle() becomes BUSY. ）
And, delivery is infinitely retried.

- 28.5.1. Clustered Grouping Best Practices
"Avoid closing consumers or make sure that you always have plenty of consumers, i.e.,if you have 3 nodes have 3 consumers."
Though it is written to a user guide in this way, I think that there may be it when it is necessary what the consumer closes and to reconnect it.
Therefore I think that it is a bug that delivery stops ,and I think that the grouping message should not do redistribute fundamentally.

Temporarily, I think that "Do not set redistribution(redistribution-delay=-1)" should be written in the user guide "28.5.1. Clustered Grouping Best Practices" .
And, When grouping message is delivered,I think that it is necessary to change it not to redistribute it.

 
Thanks.