Ken Giusti created DISPATCH-1360:
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Summary: forward pre-settled messages as unsettled within the
dispatch network
Key: DISPATCH-1360
URL: https://issues.apache.org/jira/browse/DISPATCH-1360
Project: Qpid Dispatch
Issue Type: Improvement
Components: Router Node
Affects Versions: 1.8.0
Reporter: Ken Giusti
Fix For: 1.9.0
Possible approach to credit replenishment for pre-settled messages.
For unsettled messages the router correlates the eventual settlement of the
message with credit flow to the sender. This provides a reasonable method for
rate limiting the sender.
However this approach does not apply to pre-settled messages. For these the
router simply grants sender credit when the message is forwarded, which tends
to over-provisioning credit.
Let's try to apply the behavior of the unsettled case to the settled by
forwarding presettled messages as unsettled between routers. It would work
something like this:
* presettled msg arrrives at ingress router - no flow granted
* ingress router adds a "presettled" flag to the annotations and forwards the
message into the routing network as unsettled.
* at the egress router if the "presettled" flag is in the annotations the
message is forwarded to the receiver as presettled.
* the egress router generates an PN_ACCEPTED/Settled event for the message
* which travels back to the ingress router which uses that event to grant flow
to the sender.
de[devil]tails, etc...
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