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From Sandy Pratt <prat...@adobe.com>
Subject RE: A few clustering/failover questions
Date Thu, 05 Mar 2009 20:40:48 GMT

I'm on RHEL5 and yum gives me the following version for the qpidd package:

qpidd.i386                                                 0.4.732838-1.el5

I presume that's M4?



-----Original Message-----
From: Gordon Sim [mailto:gsim@redhat.com] 
Sent: Thursday, March 05, 2009 1:54 AM
To: users@qpid.apache.org
Cc: Sandy Pratt
Subject: Re: A few clustering/failover questions

Sandy Pratt wrote:
> I've been experimented with failover on a cluster of two brokers, and
> I often see this log item when a broker fails:
> 2009-mar-04 17:11:19 debug Exception constructed: Attempted size
> underflow on dequeue(21): size: max=104857600, current=0; count: unli
>  mited; type=flow_to_disk (qpid/broker/QueuePolicy.cpp:54)
> What does underflow mean here?

The policy maintains a running count of enqueued messages and the 
aggregate size. Underflow here means that more data was dequeued than 
was enqueued which indicates some logical error.

What version of the code are you using? M4 or latest from trunk?

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