[jira] [Created] (DISPATCH-1360) forward pre-settled messages as unsettled within the dispatch network

["Ken Giusti (JIRA)" <ji...@apache.org>]

Ken Giusti created DISPATCH-1360:
------------------------------------

             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...



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@qpid.apache.org
For additional commands, e-mail: dev-help@qpid.apache.org