[DISPATCH-334] Proton sequence error during backpressure with balanced distribution

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.6.0
• Fix Version/s: 0.6.0
• Component/s: Router Node
• Assignee: Ted Ross
• Reporter: Ted Ross
• Created: 12/May/16 19:23
• Updated: 20/Nov/17 18:39
• Resolved: 16/May/16 17:32

Description

Scenario:

            +---------+        +---------+
Sender1---->|         |        |         |---->Receiver1
            |         |        |         |
            | Router1 |========| Router2 |
            |         |        |         |
Sender2---->|         |        |         |---->Receiver2
            +---------+        +---------+

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:

    ERROR:root:sequencing error, expected delivery-id 181, got 182

This occurs when one delivery results in a fanout of zero and is placed on the incoming link's undelivered list.