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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Commented] (DISPATCH-781) Tie end-to-end flow control of message-routed deliveries to outgoing capacity
Date Tue, 05 May 2020 20:23:00 GMT

    [ https://issues.apache.org/jira/browse/DISPATCH-781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17100227#comment-17100227

ASF GitHub Bot commented on DISPATCH-781:

ted-ross commented on pull request #731:
URL: https://github.com/apache/qpid-dispatch/pull/731#issuecomment-624285529

   Note that there is a new test for end-to-end flow control that fails with this patch. 
The test won't pass until the whole solution is completed.

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> Tie end-to-end flow control of message-routed deliveries to outgoing capacity
> -----------------------------------------------------------------------------
>                 Key: DISPATCH-781
>                 URL: https://issues.apache.org/jira/browse/DISPATCH-781
>             Project: Qpid Dispatch
>          Issue Type: Improvement
>          Components: Router Node, Routing Engine
>            Reporter: Ted Ross
>            Assignee: Ted Ross
>            Priority: Major
>             Fix For: 1.13.0
> This feature reverses the management of incoming credit for message-routed deliveries.
> The current mechanism is based on the the capacity of the incoming (sender-client) links.
 Each attached sender is given credit equal to the configured link capacity regardless of
the capacity of outgoing (receiver-client) links for the same address.  This means that even
under congestion, a newly attached sender will get full capacity credit to send.
> The proposed mechanism is based not on incoming capacity but on outgoing capacity.  In
this case, the senders are provided a share of the total outgoing capacity for an address.
 As the number of incoming links (senders) for an address changes and the total capacity for
outgoing links changes, the credit window of the senders shall be adjusted.
> The proposal is a heuristic approach.  It does not revoke credit from senders (but will
limit the number of credits that are replenished).  It will also not deny credit if there
are more incoming links than outgoing capacity.

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