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From Igor Galić <i.ga...@brainsware.org>
Subject Re: [users@httpd] mod_proxy_ajp failed to connect infrequently
Date Sat, 30 Oct 2010 19:13:47 GMT

----- "Yu Kikuchi" <kikuchi.yu@jp.fujitsu.com> wrote:

> Hi All.
> 
> The error_log (debug) is attached.

Hi,

I think you really need to post your config.
Your errorlog suggests that you're doing something entirely wrong.

> I understood "(120006) error" means Apache wasn't able to receive the
> headers of the response from the backend server.
> But I don't know why the headers didn't return and I want any opinions
> about the reason.
> Please teach me how to know the problem.
> 
> Best regards,
> 
> 
> (2010/10/12 11:07), Kikuchi Yu wrote:
> > Thanks for getting back to me.
> >
> >  > Could it be a timeout while waiting for the reply? Add "%D" to
> your LogFormat and check, how long those requests take.
> >
> > The following is an Apache's access_log when the HTTP 503 error
> occured.
> > It seems the request took only "42ms" so I think it's not because of
> a timeout.
> >
> > xxx.xxx.xxx.xxx - - [09/Aug/2010:03:38:32 +0900] "GET /api/alive.jsp
> HTTP/1.1" 503 2366 0 42324
> >
> >  > I didn't understand the "the errors disappeared instead of
> cping/cpong retry occurrence" part of your question.
> >
> > I'm sorry I'm not good at using English well.
> >
> > It's my understanding that:
> > 1. "ping" option gets Apache to check the connection to the
> backend.
> > 2. If the first CPing/CPong check doesn't succeed, it will
> reestablish a new connection to the backend and run one more
> > CPing/CPong.
> >
> > When I set "ping=1" option to ProxyPass directive, Apache failed the
> first CPing/CPong check, but succeeded at
> > connecting to backend by the second CPing/CPong.
> > So HTTP 500/503 error didn't occur.
> >
> > I wonder if the connection will break instantaneously(within 1
> second).
> > Would you give me any comments about this phenomenon?
> >
> >
> > (2010/10/08 20:19), Rainer Jung wrote:
> >> On 08.10.2010 09:33, Yu Kikuchi wrote:
> >>> My environment is Apache 2.2.11 and JBoss AS 5.0.0.
> >>> There were no messages in JBoss's access log when the error
> occured.
> >>>
> >>> I had changed the setting to use "mod_proxy_http" the day before
> yesterday,
> >>> then not HTTP 503 error but 502 error occured.
> >>> Are anybody onto something about this error?
> >>>
> >>> Are there any ideas to pursue the exact cause of it?
> >>>
> >>>
> >>> (2010/10/07 18:50), Yu Kikuchi wrote:
> >>>> Hello.
> >>>>
> >>>> Apache wrote such as following messages into error_log and
> returned HTTP 500/503 error infrequently.
> >>>>
> >>>> [error] (104)Connection reset by peer: ajp_ilink_receive() can't
> receive header
> >>>> [error] ajp_read_header: ajp_ilink_receive failed
> >>>> [error] (120006)APR does not understand this error code: proxy:
> read response failed from xxx.xxx.xxx.xxx:8009
> >>>> (xxx.xxx.xxx.xxx)
> >>>>
> >>>> I have installed Apache and JBoss Application Server into the
> same server.
> >>>> I suspected mod_proxy_ajp caused the errors because JBoss hasn't
> logged any messages and left indications of abort.
> >>>>
> >>>> After the setting of "ping" options, the errors disappeared
> instead of cping/cpong retry occurrence. Exactly:
> >>>>
> >>>> ---------------------------------------------------
> >>>> <Location /test>
> >>>> ProxyPass ajp://xxx.xxx.xxx.xxx:8009/test ping=1
> >>>> </Location>
> >>>> ---------------------------------------------------
> >>>>
> >>>> I examine prior occurrences, but nobody told about the cause of
> this phenomenon.
> >>>> Does anybody tell me why the errors came up?
> >>
> >> Could it be a timeout while waiting for the reply? Add "%D" to your
> LogFormat and check, how long those requests take.
> >>
> >> I didn't understand the "the errors disappeared instead of
> cping/cpong retry occurrence" part of your question.
> >>
> >> Regards,
> >>
> >> Rainer
> >>
> >>
> ---------------------------------------------------------------------
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> >>
> >>
> >
> >
> 
> 
> 
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> Project.
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-- 
Igor Galić

Tel: +43 (0) 664 886 22 883
Mail: i.galic@brainsware.org
URL: http://brainsware.org/

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