Ted Ross created DISPATCH-334:
---------------------------------

             Summary: Proton sequence error during backpressure with balanced 
distribution
                 Key: DISPATCH-334
                 URL: https://issues.apache.org/jira/browse/DISPATCH-334
             Project: Qpid Dispatch
          Issue Type: Bug
          Components: Router Node
    Affects Versions: 0.6.0
            Reporter: Ted Ross
            Assignee: Ted Ross
            Priority: Blocker
             Fix For: 0.6.0


Scenario:
{noformat}
            +---------+        +---------+
Sender1---->|         |        |         |---->Receiver1
            |         |        |         |
            | Router1 |========| Router2 |
            |         |        |         |
Sender2---->|         |        |         |---->Receiver2
            +---------+        +---------+
{noformat}
All senders and receivers are using the same address, which is configured to be 
"balanced".  When both Senders are operating, eventually one or both of the 
sending links will fail due to a sequence error:
{noformat}
    ERROR:root:sequencing error, expected delivery-id 181, got 182
{noformat}
This occurs when one delivery results in a fanout of zero and is placed on the 
incoming link's undelivered list.



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