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From michael thomas <coolbur...@yahoo.com>
Subject Re: mod_jk errors - are these normal?
Date Mon, 06 Mar 2006 21:42:18 GMT
--- Sven K�hler <skoehler@upb.de> wrote:

> > [Wed Mar 01 20:00:42 2006] [error]
> > ajp_connection_tcp_get_message::jk_ajp_common.c
> (961):
> > Can't receive the response message from tomcat,
> > network problems or tomcat is down
> (10.0.0.9:8009),
> > err=-113
> > [Wed Mar 01 20:00:42 2006] [error]
> > ajp_get_reply::jk_ajp_common.c (1503): Tomcat is
> down
> > or refused connection. No response has been sent
> to
> > the client (yet)
> > [Wed Mar 01 20:00:42 2006] [info]
> > ajp_service::jk_ajp_common.c (1721): Receiving
> from
> > tomcat failed, recoverable operation attempt=0
> > [Wed Mar 01 20:00:42 2006] [info]
> > ajp_service::jk_ajp_common.c (1749): Sending
> request
> > to tomcat failed,  recoverable operation attempt=1
> 
> I always had those errors. I did anything i could do
> - change timeouts,
> change backlog, change this, change that - whatever
> - these errors remain.

Sounds very familiar. =P


> Just make sure, that the tomcat allows as much or
> more ajp-connctions,
> than there will be apache-processes/threads.

Definitely done this.

 
> I think the programmers have given up on solving
> this - whatever the
> problem is. AFAIK, mod_jk prints that error-messages
> to the log and then
> tries another connect which usually works.
> 
> Actually i hear the developers say: "this is not a
> problem" - or
> something like that. Well, no comment on that ...
> 

Yeah, I am ready to believe that this is part of
normal operation.  

However, there are two things that make me think
something might be wrong.

1. When we turned autonegotiation off on our NIC's
(which ended up putting them in half duplex mode,
because the switch still has autonegotiation on), the
problems went away.  After more than 24 hours running,
we didn't have a single error in mod_jk

2. It seems like people who have apache and tomcat
running on the same server can get away without any
errors.

#1 seems to indicate possibly a problem in our
network.
#2 seems to indicate a problem in the way mod_jk
handles server to server connections.

Can the developers/other users chime in on if these
errors are part of normal server to server operations?

Thanks,
-Michael


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