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From Oleg Kalnichevski <ol...@apache.org>
Subject Re: High server load due to SessionOutputBufferImpl.flush()
Date Mon, 15 Sep 2014 08:41:37 GMT
On Sun, 2014-09-14 at 21:49 +0200, Tobias Bieniek wrote:
> Hi Oleg,
> 
> I had to modify the logging code a bit to work with the v4.3 branch
> and I've also changed the loggers to use our slf4j logging, but on
> friday we've finally deployed the code to one of our server and waited
> for the spinning to appear again. This is what I see a lot in the
> logs:
> 
> 2014-09-14 19:40:17,630 DEBUG [I/O dispatcher 31]
> NHttpServerConnection:144 - produceOutput : http-incoming-22190:
> Produce output
> 2014-09-14 19:40:17,630 DEBUG [I/O dispatcher 183]
> NHttpServerConnection:144 - produceOutput : http-incoming-13597:
> Produce output
> 2014-09-14 19:40:17,630 DEBUG [I/O dispatcher 31]
> NHttpServerConnection:112 - close : http-incoming-22190: Close
> connection
> 2014-09-14 19:40:17,630 DEBUG [I/O dispatcher 183]
> NHttpServerConnection:112 - close : http-incoming-13597: Close
> connection
> 2014-09-14 19:40:17,630 DEBUG [I/O dispatcher 31]
> NHttpServerConnection:144 - produceOutput : http-incoming-22190:
> Produce output
> 2014-09-14 19:40:17,630 DEBUG [I/O dispatcher 183]
> NHttpServerConnection:144 - produceOutput : http-incoming-13597:
> Produce output
> 2014-09-14 19:40:17,630 DEBUG [I/O dispatcher 31]
> NHttpServerConnection:112 - close : http-incoming-22190: Close
> connection
> 2014-09-14 19:40:17,630 DEBUG [I/O dispatcher 183]
> NHttpServerConnection:112 - close : http-incoming-13597: Close
> connection
> 2014-09-14 19:40:17,630 DEBUG [I/O dispatcher 31]
> NHttpServerConnection:144 - produceOutput : http-incoming-22190:
> Produce output
> 2014-09-14 19:40:17,630 DEBUG [I/O dispatcher 183]
> NHttpServerConnection:144 - produceOutput : http-incoming-13597:
> Produce output
> 2014-09-14 19:40:17,631 DEBUG [I/O dispatcher 31]
> NHttpServerConnection:112 - close : http-incoming-22190: Close
> connection
> 2014-09-14 19:40:17,631 DEBUG [I/O dispatcher 183]
> NHttpServerConnection:112 - close : http-incoming-13597: Close
> connection
> 
> I'm not exactly sure what the problem is here, but it looks wrong to
> me. I hope someone here is able to explain what might be happening
> there.
> 

Tobias

I am seeing anything abnormal here, just some connections not being kept
alive, which may be perfectly normal depending on the client request
composition.


> Would you want me to share the modified logging code so you could
> integrate it into your repo again?
> 

Absolutely. Please raise a JIRA and attach a patch with your changes.

Oleg



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