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From Kim van der Riet <kim.vdr...@redhat.com>
Subject Re: I/O Errors
Date Thu, 31 Mar 2011 13:33:57 GMT
The first two errors are store errors; the third is a broker error
related to policy handling (in QueuePolicy.cpp). However, these errors
may be related.

I would be interested in reproducing these errors, can you supply
additional details, including the hardware (ie, how many processors, how
much memory and disk space), OS and version you are using, also if
possible a simple reproducer.

None of these errors should show up during normal usage, and indicate a
possible race condition or logic error.


On Wed, 2011-03-30 at 17:20 +0400, Sergey_Zhemzhitsky@troika.ru wrote:
> Hi there,
> I'm using qpid 0.8 and sending only durable messages.
> From time to time the following exceptions can occur:
> 1. Journal "MyQueue": get_events() returned JERR_JCNTL_AIOCMPLWAIT; 
> wmgr_status: wmgr: pi=29 pc=44 po=0 aer=32 edac:TFFF 
> ps=[AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA] wrfc: state: Active fcntl[6]: pfid=6 
> ws=11268 wc=3256 rs=0 rc=0 ec=1282 ac=32
> 2. Journal "MyQueue": Unexpected I/O response (RHM_IORES_BUSY) on queue 
> MyQueue
> 3. error Unexpected exception: Attempted size underflow on dequeue(559): 
> size: max=104857600, current=119; count: unlimited; type=reject 
> From the source code I know that 
> JERR_JCNTL_AIOCMPLWAIT means that "Timeout waiting for AIOs to complete"
> RHM_IORES_BUSY means that "Another blocking operation is in progress"
> but that all and I can't go any further.
> Could you please help to determine what kind of I/O operations can cause 
> such errors and why they can occur?
> Best Regards,
> Sergey Zhemzhitsky
> Information Technology Division
> Troika Dialog, 4, Romanov lane, Moscow 125009, Russia
> Phone. +7 495 2580500 ext. 1246
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