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From "Ted Ross (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DISPATCH-58) Router/Broker interaction - Unroutable/released messages are continually resent
Date Tue, 27 May 2014 13:50:01 GMT

    [ https://issues.apache.org/jira/browse/DISPATCH-58?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14009678#comment-14009678
] 

Ted Ross commented on DISPATCH-58:
----------------------------------

Another possibility:  Modify the router so that it doesn't replenish credit when a message
is undeliverable, thus applying link backpressure until there is a destination for the address.


> Router/Broker interaction - Unroutable/released messages are continually resent
> -------------------------------------------------------------------------------
>
>                 Key: DISPATCH-58
>                 URL: https://issues.apache.org/jira/browse/DISPATCH-58
>             Project: Qpid Dispatch
>          Issue Type: Bug
>          Components: Routing Engine
>    Affects Versions: 0.2
>            Reporter: Ted Ross
>
> There's an issue with the fact that the router releases unroutable messages.  When the
message originates from a broker, that broker will continually re-send the message, burning
network bandwidth, until the message becomes routable.
> Here are a few ideas as to how to address this situation:
>   - Have the ingress router hold the message for a time if it is not routable to avoid
rapidly releasing.
>   - Introduce a notion of not-routable-now vs. not-routable-ever.  This would allow the
router to hold-for-retry or immediately reject.
> Are there cases where the current behavior is desirable?  If the producer node has multiple
outgoing links, a quick release would allow it to use an alternate link.



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