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To: tomcat-dev@jakarta.apache.org
From: Costin Manolache <cmanolache@yahoo.com>
Subject: RE: mod_jk and Apache timeouts?
Date: Mon, 17 Feb 2003 12:55:34 -0800
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 <D395BFB7BC08B84987AC60473CFFD92D060D@readingex.reading.workplace-systems.plc.uk>
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Thanks Dave.

Now if someone has windows and can grep what errno "53" means...


Costin

Oxley, David wrote:

> Costin,
> 
> Here is the log produced with mod_jk HEAD:
> [Mon Feb 17 17:23:26 2003]  [jk_ajp_common.c (681)]: ERROR: can't receive
> the response message from tomcat, network problems or tomcat is down.
> err=-53
> [Mon Feb 17 17:23:26 2003]  [jk_ajp_common.c (1051)]: Error reading reply
> from tomcat. Tomcat is down or network problems.
> [Mon Feb 17 17:23:26 2003]  [jk_ajp_common.c (1188)]: ERROR: Receiving
> [from
> tomcat failed, recoverable operation. err=0
> [Mon Feb 17 17:23:26 2003]  [jk_ajp_common.c (681)]: ERROR: can't receive
> the response message from tomcat, network problems or tomcat is down.
> err=-1
> [Mon Feb 17 17:23:26 2003]  [jk_ajp_common.c (1051)]: Error reading reply
> from tomcat. Tomcat is down or network problems.
> [Mon Feb 17 17:23:26 2003]  [jk_ajp_common.c (1188)]: ERROR: Receiving
> [from
> tomcat failed, recoverable operation. err=1
> [Mon Feb 17 17:23:26 2003]  [jk_ajp_common.c (681)]: ERROR: can't receive
> the response message from tomcat, network problems or tomcat is down.
> err=-1
> [Mon Feb 17 17:23:26 2003]  [jk_ajp_common.c (1051)]: Error reading reply
> from tomcat. Tomcat is down or network problems.
> [Mon Feb 17 17:23:26 2003]  [jk_ajp_common.c (1188)]: ERROR: Receiving
> [from
> tomcat failed, recoverable operation. err=2
> [Mon Feb 17 17:23:26 2003]  [jk_ajp_common.c (1199)]: Error connecting to
> tomcat. Tomcat is probably not started or is listenning on the wrong port.
> Failed errno = 53
> 
> Cheers.
> Dave.
> 
>> -----Original Message-----
>> From: Oxley, David [mailto:David.Oxley@workplace-systems.plc.uk]
>> Sent: 17 February 2003 17:00
>> To: 'Tomcat Developers List'
>> Subject: RE: mod_jk and Apache timeouts?
>> 
>> Costin,
>> 
>> I will rebuild from HEAD now and give it a try.
>> But I think I may have sorted found the problem. I have changed the
>> Connector timeout to -1 in server.xml, and error 500's is no longer
>> returned.
>> Therefore on this box, mod_jk is too quick for Tomcat (I think).
>> mod_jk tries to connect and fails 3 times (before TC has restarted its
>> Connector threads) and returns an error 500 to the client.
>> 
>> Dave.
>> 
>> > -----Original Message-----
>> > From: Costin Manolache [mailto:cmanolache@yahoo.com]
>> > Sent: 17 February 2003 17:02
>> > To: tomcat-dev@jakarta.apache.org
>> > Subject: Re: mod_jk and Apache timeouts?
>> >
>> > 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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