Ted Ross created QPID-4065:
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             Summary: Remove the message's trace list during Queue::reRoute
                 Key: QPID-4065
                 URL: https://issues.apache.org/jira/browse/QPID-4065
             Project: Qpid
          Issue Type: Improvement
          Components: C++ Broker
            Reporter: Ted Ross
            Assignee: Ted Ross
            Priority: Minor
             Fix For: 0.17


When messages in a queue are re-routed through an exchange by the "reRoute" 
method, the trace list in each re-routed message must be cleared.

The reason for this is that re-route is often used to attempt to route messages 
that were previously unroutable and were stored in a queue.  If the trace list 
is left in the message, loop-prevention might cause the message to be dropped 
if the new route leads to a broker through which the message has already passed.

>From a loop-prevention standpoint, re-routed messages must start from scratch 
>with a clean trace list.

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