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https://issues.apache.org/jira/browse/QPID-3080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13001450#comment-13001450
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Ken Giusti commented on QPID-3080:
----------------------------------
As implemented, there is no time-based dampening. But the events are governed
by the same hysteresis that prevents the thrashing of flow control state (a
separation between the 'active' and 'inactive' thresholds).
So it depends - based on configuration and traffic flow, it has the potential
of being quite frequent.
To be honest, I'm not 100% convinced on the necessity of this feature -
especially in light of Gordon's recent implementation of queue threshold
events. If someone really wanted events on flow control changes, they _could_
be manually configured on a per-queue basis using the new queue threshold event
feature.
I'm leaning toward to deferring this, unless there is an overwhelming consensus
to add it.
Opinions?
> Broker should issue QMF event on queue flow control state change
> ----------------------------------------------------------------
>
> Key: QPID-3080
> URL: https://issues.apache.org/jira/browse/QPID-3080
> Project: Qpid
> Issue Type: Bug
> Components: C++ Broker
> Affects Versions: 0.9
> Environment: all
> Reporter: Ken Giusti
> Assignee: Ken Giusti
> Priority: Trivial
> Fix For: 0.9
>
> Attachments: QPID-3080.patch
>
>
> When a queue's flow control state changes, the broker should issue an QMF
> event to notify management clients.
> A rough sketch of a possible schema implementation for the event:
> <eventArguments>
> ....
> <arg name="qName" type="sstr" desc="Name of a queue"/>
> <arg name="msgDepth" type="count32" desc="Current size of queue in
> messages"/>
> <arg name="byteDepth" type="count32" desc="Current size of queue in
> bytes"/>
> <arg name="active" type="bool" desc="True if flow stopped, else flow
> allowed"/>
> </eventArguments>
> <event name="queueFlowControl" sev="inform" args="qName, active,
> msgDepth, byteDepth"/>
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