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From Shyam Santhanam <ssantha...@vmware.com>
Subject Re: Problems with Virtual Topics
Date Thu, 01 Apr 2010 16:59:17 GMT

James - great thanks for your replies, they were very helpful.


James Casey-2 wrote:
> 
> use suppressDuplicateQueueSubscriptions="true" on the network connectors I
> normally only see one additional consumer - what is your topology ?
> 

Thanks, I'm definitely gonna try this out. We have a fully-connected
topology, i.e every broker is connected to every other. 


James Casey-2 wrote:
> 
> Could it be this : <https://issues.apache.org/activemq/browse/AMQ-2586> ?
> 

Yes, perhaps it's just the statistic that is off. Makes more sense now.
Thank you.


James Casey-2 wrote:
> 
>> When I try to browse the contents of
>> the topic, I often find that there are some residual messages (usually
>> far
>> fewer messages than indicated by the QueueSize statistic, but > 0
>> nonetheless). Again, this doesn't gel with my understanding. I thought
>> that
>> the topics themselves are "virtual" which should imply that they don't
>> have
>> a persistent cache of messages anywhere? Are the virtual topics
>> themselves
>> also persisted? If so, when do messages in the topic get evacuated?
>>
>> You can  use the topic as a normal topic - perhaps this is the effect you
> see ?  when you subscribe then any  messages received will be sent to your
> topic consumer.
> 

Yes this would explain it. Since we never consume from these topics
directly, how do we prevent messages from backing up indefinitely in these
topics? We'd prefer not to have a TTL set on our messages, since this is
very critical non-transient data.

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