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To: Alan Conway <aconway@redhat.com>
Cc: Kim van der Riet <kim.vdriet@redhat.com>, users@qpid.apache.org
Subject: Re: I/O Errors
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From: Sergey_Zhemzhitsky@troika.ru
Date: Fri, 1 Apr 2011 09:55:38 +0400
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Hi Alan,

Thanks for information,

>From you message I understood that queue policy error can occur due to 
previous errors with persistent store, for example, queue policy is 
incremented and just after that the error occurs when trying to persist a 
message.


Best Regards,
Sergey Zhemzhitsky


Alan Conway <aconway@redhat.com> 
31.03.2011 19:06
Please respond to
users@qpid.apache.org


To
users@qpid.apache.org
cc
Kim van der Riet <kim.vdriet@redhat.com>
Subject
Re: I/O Errors


On 03/31/2011 09:33 AM, Kim van der Riet wrote:
> 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.
>

I think the broker error is caused by the store error plus a bug in the 
broker: 
the queue policy count is incremented before the call to the store, when 
the 
store throws the count is not decremented so its incorrect since the 
message 
didn't actually get on the queue.

>
> 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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>
>
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