Recently I met http://jira.jboss.org/jira/browse/JBMESSAGING-1235 - it is not possible to deploy a queue, undeploy it and deploy it with different clustered attribute. The workaround says "remove the row from JBM_POSTOFFICE table".

Why is not the row deleted automatically on undeploy?
As I can see in org.jboss.messaging.core.impl.postoffice.MessagingPostOffice.internalRemoveBinding(...)
around line 1916:

if (queue.isRecoverable()) {
 //Need to remove from db too
 deleteBindingFromStorage(queue);
}

the line should be deleted if isRecoverable() returns true. Then it should be possible to deploy a queue with the same name and different value of clustered attribute, correct? Under what conditions is the queue recoverable?