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From Bruno Matos <bruno.ma...@paradigmaxis.pt>
Subject Re: Journal with LVQ
Date Tue, 18 Jan 2011 15:31:54 GMT

On 2011/01/12, at 17:33, Gordon Sim wrote:

> On 01/11/2011 04:30 PM, Bruno Matos wrote:
>> I'm publishing messages to a durable LVQ, when I run the publisher  
>> for
>> the first time the journal stays almost full, then I send the exact  
>> same
>> messages, expecting the old ones to be replaced, but after some  
>> time the
>> connection is closed with "Enqueue capacity threshold exceeded on
>> queue". With qpid-tool I can see that msgDepth and byteDepth are  
>> exactly
>> the same before and after the second run. Is this the expected  
>> behavior?
> Depends on what you mean by 'expected' :-)
> It is certainly the case that the linux journal will reach capacity  
> with different queue depths, depending on exact sequences of  
> changes. i.e. the capacity is not simply a function of the final  
> state, but also of the path to get there. In the second case there  
> would be additional dequeue records and the file boundaries might  
> not align the same way etc, so the journal space can be used up for  
> fewer enqueued messages.

Thank you Gordon.
I think I can say that's the expected to me... :) Although I need to  
know what journal size is effectively in use, can be a percentage, is  
that possible? I have a stored queue for browsing, like a dictionary,  
that is updated every night, and I want to reset it only if it reaches  
to a given percentage of journal size.


Bruno Matos

Apache Qpid - AMQP Messaging Implementation
Project:      http://qpid.apache.org
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