the inflight count means inflight to a consumers session, not necessarily received and unacked by a consumer. You must have 6 consumers. There is an additional prefetch extension that is used in transactions when a message is delivered so that a transction can span the prefetch limit.
2009/6/24 Denis Bazhenov <bazhe...@farpost.com> > There is one more aspect that I don't understand. > > My queue InFlightCount value vary about 6000. One moment it's exactly > 6000, another moment it's 6012 and so on (but never <6000). So new > messages are acknowledged correctly, but there is 6K messages that were > not commited by consumer, I guess. > > We have 2 options here. First of all maybe these 6K messages were > dispatched to another consumer (and acknowledged), so InFlightCount must > be equals zero. Second option is that these 6K messages are not > dispatched to another consumer and hang up somewhere. > > Where is truth? > > P.S. Browse method on queue (via JMX console) says that queue doesn't > have messages. > > On Tue, 2009-06-23 at 16:51 +0100, Gary Tully wrote: > > the prefetch has a large bearing on this, it defaults to 1000 for queues. > > > > If you have lots of consumers that consume just a few messages (say 100), > > each will get dispatched up to the prefetch value, and when the consumer > > closes, the remaining 900 will get dispatched again to another consumer. > > > > Hence dispatchCount total can increase past the enqueue count. > > The inflightCount is the sum of the current non committed prefetched > > messages for existing consumers. > > > > For more info on prefetch see: > > http://activemq.apache.org/what-is-the-prefetch-limit-for.html > > > > > > 2009/6/23 David Sitsky <s...@nuix.com> > > > > > 2009/6/19 Denis Bazhenov <bazhe...@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 > > > > > > > > > > -- > Denis Bazhenov <bazhe...@farpost.com> > FarPost. > > -- http://blog.garytully.com Open Source Integration http://fusesource.com
