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Date: Mon, 24 Dec 2012 09:57:32 +0800 (CST)
From: SuoNayi  <suonayi2006@163.com>
To: users@activemq.apache.org
Subject: Reply:Re: What will happen if consumer uses the client acknowledge
 model but no further explicit acknowledges are made?
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Thanks chris, in fact I know what these metrics mean.
Here I just want to make sure the consequence of my use case where 
my consumer only receives messages but not ack them at all(via the 
client acknowledge model).Because the broker need track the messages 
that are dispatched to the consumer and not acked by the consumer all
the time so the dispatched queue size keeps increasing.
When lots of messages(supposing there are many pending messages 
for dispatch) are dispatched to the consumer the memory consumption 
in the broker will exceed the memory limit of the queue at last, the dispatch 
job will pause for waiting for available memory space.


Hope someone can correct my judgement.
Thanks,
SuoNayi

At 2012-12-23 23:46:16,chris.odom@mediadriver.com wrote:
>
>SuoNayi
>    Queue's only keep one copy of any message at any given time, that I 
>am aware of. What you are seeing the web console are metrics that the 
>Broker maintains about the Queue. Messages arrive to a Queue the Enqueue 
>count increments. A Consumer reads a message from the Queue the Dispatch 
>count increments. The Consumer acknowledges receipt of the message the 
>Dequeue count increments. These are just numbers that correspond to the 
>actions that the Broker has taken for a message. Hopefully these help 
>explain what it is you are seeing.
>
>On 2012-12-23 08:40, SuoNayi wrote:
>> Hi all,
>> I just want to make sure what will happen if my consumer uses the
>> client acknowledge model
>> but no further explicit acknowledges are made?According to my
>> observation,when producers are keeping
>> sending messages to the queue,the dispatched queue size for my
>> consumer (on the web console)
>> keeps increasing.
>> I assume that with the increase of the dispatched queue size, more
>> and more messages will be
>> loaded into the dispatched queue for the subscription in the broker
>> and more memory is taken from the SystemUsage.
>> When the memory limit is exceed,the dispatch messages to the consumer
>> will pause for available memory space.
>> If the memory usage is not handled properly, OOM will be thrown.
>>
>>
>> Please correct me if I'm wrong.
>>
>>
>> Thanks,
>> SuoNayi
>

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