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From IBeaumont <IBeaum...@categoric.com>
Subject Re: Q Consumers stop receiving messages
Date Tue, 13 Jan 2009 20:02:15 GMT

The application is already written, and currently we use either MQSeries or
SwiftMQ for the queue provider.  I tried to drop ActiveMQ in a few years
back but the performance was awful.  With version 5 it seems the performance
problems are sorted.  Implementing a MessageListener isn't an ideal solution
as I'd need to change a lot of other code.  I'm trying to avoid any changes.



bsnyder wrote:
> 
> On Tue, Jan 13, 2009 at 12:35 PM, IBeaumont <IBeaumont@categoric.com>
> wrote:
>>
>> I'm sending a mixture of persistent and non persistent messages.
>>
>> I have seen a negative queue count before so will look at the trunk.
>>
>> Can't see anything unusal in JConsole, but I have just downlaoded the
>> source
>> and in the ActiveMQMessageConsumer.receiveNoWait there are these lines...
>>        if (info.getPrefetchSize() == 0) {
>>            md = dequeue(-1); // We let the broker let us know when we
>>            // timeout.
>>        } else {
>>            md = dequeue(0);
>>        }
>>
>> So that explains why my consumes seem to hang when things go wrong -
>> because
>> they wait forever because I have a prefetchSize of zero.
>>
>> I've now changed me code so that instead of using receiveNoWait, I'll use
>> "receive" with a short timeout.  Hopefully then things will timeout and
>> messages will contiue to be processed.  I'll then need to find out if all
>> any messages get skipped.   ALthough that doesn't help find the cause.
> 
> I'm just curious, instead of using the synchronous methods have you
> considered using the asynchronous API by implementing a
> MessageListener?
> 
> Bruce
> -- 
> perl -e 'print
> unpack("u30","D0G)U8V4\@4VYY9&5R\"F)R=6-E+G-N>61E<D\!G;6%I;\"YC;VT*"
> );'
> 
> Apache ActiveMQ - http://activemq.org/
> Apache Camel - http://activemq.org/camel/
> Apache ServiceMix - http://servicemix.org/
> 
> Blog: http://bruceblog.org/
> 
> 

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