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From Tobias Bieniek <Tobias.Bien...@gmx.de>
Subject Re: High server load due to SessionOutputBufferImpl.flush()
Date Fri, 19 Sep 2014 09:52:28 GMT
I should add that this request was actually *not* received via SSL!

Tobias

2014-09-19 11:31 GMT+02:00 Tobias Bieniek <Tobias.Bieniek@gmx.de>:
> Hi Oleg,
>
> we've finally managed to freeze the log file after the spinning was
> first detected and this is the output of the spinning session:
>
> https://gist.github.com/Turbo87/db7365bac349c7e56690
>
> Tobias
>
>
>
> 2014-09-16 13:36 GMT+02:00 Oleg Kalnichevski <olegk@apache.org>:
>> On Tue, 2014-09-16 at 13:08 +0200, Tobias Bieniek wrote:
>>> > If you do not want me to make wild guesses, please make available a
>>> > _complete_ context / header log of the session.
>>>
>>> I'll see what I can do. The problem is that with our production
>>> traffic on the server the log files are rotating very fast and it is
>>> hard to catch a log of one entire request session, but without the
>>> production traffic the problem doesn't seem to be reproducible.
>>>
>>> Since yesterday more of the I/O workers have started spinning again
>>> and are cluttering the log files now.
>>>
>>> I know it is wild guessing, but could the problem be related to
>>> streaming file downloads over SSL that are cancelled on the client
>>> side? It appears as if the SSL session might be staying in the CLOSING
>>> state forever with some data in the buffer but unable to flush it out.
>>>
>>> Tobias
>>>
>>
>> Tobias
>>
>> This is quite likely to be related to abnormal SSL connection
>> termination causing the I/O session to spin while trying to complete SSL
>> session handshake. But I need to see the session log to be 100% sure.
>>
>> Oleg
>>
>>
>>
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