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From David Sitsky <s...@nuix.com>
Subject Re: InFlightCount/DispatchCount meaning
Date Tue, 23 Jun 2009 00:05:21 GMT
2009/6/19 Denis Bazhenov <bazhenov@farpost.com>:
> I'm interested in following topic. What does the InFlightCount mean if
> JMX console for queue.
>
> It's seems like in flight count is difference between dequeue count and
> dispatch count. But I have very strange situation.
>
> I have a queue which have following statistic:
>
> DequeueCount:  55189
> DispatchCount: 77525
> EnqueueCount:  55191
> InFlightCount: 22336
> QueueSize:     2
>
> How can I dispatch more messages than I enqueue? Can anyone explain what
> does this numbers mean?

Note that DequeueCount + InFlightCount == DispatchCount.

>From my understanding:

EnqueueCount = Number of messages sent to a queue and committed.

DequeueCount = Number of messages removed from a queue and committed.

DispatchCount = Number of messages sent from this queue to consumers.
Includes messages which were not commit()ed, but rolledback.

InFlightCount = Number of messages sent from this queue to consumers
that haven't been committed.

Given you large difference in DispatchCount compared to DequeueCount,
perhaps a lot of your consumers are failing when they receive a
message, and don't call commit().

-- 
Cheers,
David

Nuix Pty Ltd
Suite 79, 89 Jones St, Ultimo NSW 2007, Australia    Ph: +61 2 9280 0699
Web: http://www.nuix.com                            Fax: +61 2 9212 6902

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