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From "Ted Ross (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (DISPATCH-33) Use session flow control to protect the router's memory
Date Fri, 04 Apr 2014 19:38:19 GMT

     [ https://issues.apache.org/jira/browse/DISPATCH-33?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Ted Ross reassigned DISPATCH-33:

    Assignee: Ted Ross

> Use session flow control to protect the router's memory
> -------------------------------------------------------
>                 Key: DISPATCH-33
>                 URL: https://issues.apache.org/jira/browse/DISPATCH-33
>             Project: Qpid Dispatch
>          Issue Type: Improvement
>          Components: Router Node
>    Affects Versions: 0.2
>            Reporter: Ted Ross
>            Assignee: Ted Ross
>             Fix For: 0.3
> Dispatch will allow its internal buffers to grow without bound if message producers are
faster than message consumers.  It would be possible to apply back-pressure on senders using
link credits but this has some pathological effects depending on the message routing patterns
in effect (i.e. well behaved producers may find themselves punished for others' transgressions).
> A better approach is to use session-based flow control to put a cap on the amount of
memory a single producer can consume in the form of in-flight messages.  This is better because
it applies back pressure only to those producers that are over-producing.  Furthermore, session
flow control is frame-based (as opposed to link-credits which are message based) which ties
the limits to actual memory use because frames are bounded in size.

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