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From ttmdev <joe.fernan...@ttmsolutions.com>
Subject Re: Priority queue/semantics of consumer priority
Date Tue, 12 Feb 2008 13:36:23 GMT

Hi Roger,

I'd disregard the consumer priority feature; it does not function as
described in the consumer priority page. 

Here's the exclusive consumer web page. 

http://activemq.apache.org/exclusive-consumer.html

Joe
www.ttmsolutions.com
 

 

 

Roger Hoover wrote:
> 
> I want to implement a priority queue (message delivery ordered by
> priority)
> and am trying to figure out what consumer priority means.
> 
> After looking over the documentation (
> http://activemq.apache.org/consumer-priority.html) and these email
> threads,
> the semantics of consumer priority are still not entirely clear to me.
> http://www.nabble.com/Consumer-Priority-on-AMQ-5.0-to14369093s2354.html#a14369093
> http://www.nabble.com/Using-different-consumer-priorities-in-the-same-connection-td14722765s2354.html#a14722765
> 
> - Does consumer priority control the order of message delivery or does it
> influence which consumer messages get sent to?
> 
> - If it controls delivery order, what effect does setting a priority on a
> consumer have?  It would seem like the priority should be set per message.
> 
> - What does Hiram mean by "exclusive consumers"?  Is this different from
> each message being delivered to one and one only consumer?
> 
> - What is the weighting algorithm for priorities?
> 
> - What is the ballpark performance penalty for priority evaluation on the
> broker?
> 
> - Does the priority value have any particular significance other than
> being
> greater or less than other priority levels?
>   - Is there a maximum priority value?
>   - Does priority 0 have any special meaning?
> 
> - Does the feature exist in AMQ 4.1.1?
> 
> - Are there any gotchas when using it with STOMP?
> 
> I appreciate any info anyone can provide.
> 
> Cheers,
> 
> Roger
> 
> 

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