[DISPATCH-169] Add Ingress FIFO for incoming message-routed links

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.6.0
• Component/s: Router Node
• Assignee: Ted Ross
• Reporter: Ted Ross
• Created: 11/Sep/15 15:46
• Updated: 20/Nov/17 18:39
• Resolved: 18/Mar/16 23:07

Description

The current router design does message routing synchronously with the receipt of delivered messages. The proposed improvement will put a FIFO for deliveries on the incoming links (only for links used for message-routing, not routed-links). This has the following benefits:

• A credit loop can be established for the producer such that back-pressure prevents the FIFO from exceeding a defined limit.
• Messages that cannot be routed, or that are lost due to topology change can be resent from the ingress link without the involvement of the attached client.
• Routing can be moved to a single thread thus eliminating lock contention on the route table.