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From Costin Manolache <cmanola...@yahoo.com>
Subject Re: mod_jk and Apache timeouts?
Date Mon, 17 Feb 2003 17:02:22 GMT
I suspect it's a windows specific return code from recv().

The code in question calls socket_recvfull - which in turn calls recv()
to fill a buffer. It handles EAGAIN - but knowing windows, it may be
something else.

If you can do a checkout from HEAD and built again - you should see 
the errno at the end of the message, so we can figure out what happens.

The first error is the one that matters - the others are just jk doing 
a retry. The message is bad - err=0,1,2 should be "retry=0,1,2"



Costin


Oxley, David wrote:

> I have some strange error messages in mod_jk.log that I cannot explain,
> and that I need to resolve urgently.
>  
> Server:
> Dual Xeon 2.5Ghz server.
> Windows 2000 Professional SP3
> Apache 2.0.44
> Tomcat 4.1.18
> Mod_jk 1.2.2
>  
> [Mon Feb 17 14:49:38 2003]  [jk_ajp_common.c (681)]: ERROR: can't receive
> the response message from tomcat, network problems or tomcat is down.
> [Mon Feb 17 14:49:38 2003]  [jk_ajp_common.c (1050)]: Error reading reply
> from tomcat. Tomcat is down or network problems.
> [Mon Feb 17 14:49:38 2003]  [jk_ajp_common.c (1187)]: ERROR: Receiving
> [from
> tomcat failed, recoverable operation. err=0
> [Mon Feb 17 14:49:38 2003]  [jk_ajp_common.c (681)]: ERROR: can't receive
> the response message from tomcat, network problems or tomcat is down.
> [Mon Feb 17 14:49:38 2003]  [jk_ajp_common.c (1050)]: Error reading reply
> from tomcat. Tomcat is down or network problems.
> [Mon Feb 17 14:49:38 2003]  [jk_ajp_common.c (1187)]: ERROR: Receiving
> [from
> tomcat failed, recoverable operation. err=1
> [Mon Feb 17 14:49:38 2003]  [jk_ajp_common.c (681)]: ERROR: can't receive
> the response message from tomcat, network problems or tomcat is down.
> [Mon Feb 17 14:49:38 2003]  [jk_ajp_common.c (1050)]: Error reading reply
> from tomcat. Tomcat is down or network problems.
> [Mon Feb 17 14:49:38 2003]  [jk_ajp_common.c (1187)]: ERROR: Receiving
> [from
> tomcat failed, recoverable operation. err=2
> [Mon Feb 17 14:49:38 2003]  [jk_ajp_common.c (1198)]: Error connecting to
> tomcat. Tomcat is probably not started or is listenning on the wrong port.
> Failed errno = 0
> 
>  
> 
> The line 'ERROR: Receiving from tomcat failed, recoverable operation.
> err=0' happens all the time but when the above happens i.e. err=0 -> err=1
> -> err=2 the browser is returned an error 500. I have a much slower box
> (P4 1.7Ghz) that gets the err=0 line all the time but never gets the err=1
> and err=2 lines and therefore never responds with an error 500.
> 
> I have a feeling that there is a retry that is happening but the box is so
> quick the threads on the Tomcat side aren't refreshed before Apache gives
> up. If this can be fixed by changing the config files then I think this
> should be noted in the docs otherwise this is a bug!?!?
> 
>  
> 
> Here is the relevant parts of the config.
> 
> Server.xml:
> 
>     <Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
> 
>                port="8009" minProcessors="5" maxProcessors="75"
> 
>                enableLookups="true" redirectPort="443"
> 
>                acceptCount="10" debug="0" connectionTimeout="20000"
> 
>                useURIValidationHack="false"
> 
>  
> protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler"/>
> 
> workers.properties:
> 
> worker.ajp13.port=8009
> 
> worker.ajp13.host=localhost
> 
> worker.ajp13.type=ajp13
> 
> worker.ajp13.lbfactor=1
> 
> worker.ajp13.cachesize=10
> 
> worker.ajp13.cache_timeout=600
> 
>  
> 
> Thanks for your help.
> 
>  
> 
> Dave Oxley
> Development Team Leader
> 
> Workplace Systems Plc
> * +44 (0)118 9515 755
> *  <mailto:david.oxley@workplace-systems.plc.uk>
> david.oxley@workplace-systems.plc.uk
> *  <http://www.workplace-systems.plc.uk/>
> http://www.workplace-systems.plc.uk
> 
>  
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