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From Rainer Jung <rainer.j...@kippdata.de>
Subject Re: Application stops responding, jk worker in error state
Date Sat, 19 Jun 2010 00:29:42 GMT
On 18.06.2010 22:44, Neil Aggarwal wrote:
> Rainer:
>
>> If you are going to post part of your log file, please also
>> do provide
>> your mod_jk configuration and version information.
>
> I am using mod_jk 1.2.30 which I built from the source tarball.
>
> My application just locked up so I did a tail -f
> on the mod_jk log and made a request to it.
>
> Here is what generated in the log:
>
> [Fri Jun 18 15:30:17.614 2010] [394:47652193829632] [info]
> ajp_connection_tcp_get_message::jk_ajp_common.c (1230): (tomcat) can't
> receive the response header message from tomcat, network problems or tomcat
> (127.0.0.1:8009) is down (errno=11)

Hmmm, errno 11 is often EAGAIN. What platform are you using (OS, version)?

> [Fri Jun 18 15:30:17.614 2010] [394:47652193829632] [error]
> ajp_get_reply::jk_ajp_common.c (2055): (tomcat) Tomcat is down or refused
> connection. No response has been sent to the client (yet)
> [Fri Jun 18 15:30:17.614 2010] [394:47652193829632] [info]
> ajp_service::jk_ajp_common.c (2540): (tomcat) sending request to tomcat
> failed (recoverable),  (attempt=1)
> [Fri Jun 18 15:31:19.711 2010] [394:47652193829632] [info]
> ajp_connection_tcp_get_message::jk_ajp_common.c (1230): (tomcat) can't
> receive the response header message from tomcat, network problems or tomcat
> (127.0.0.1:8009) is down (errno=11)
> [Fri Jun 18 15:31:19.711 2010] [394:47652193829632] [error]
> ajp_get_reply::jk_ajp_common.c (2055): (tomcat) Tomcat is down or refused
> connection. No response has been sent to the client (yet)
> [Fri Jun 18 15:31:19.711 2010] [394:47652193829632] [info]
> ajp_service::jk_ajp_common.c (2540): (tomcat) sending request to tomcat
> failed (recoverable),  (attempt=2)
> [Fri Jun 18 15:31:19.711 2010] [394:47652193829632] [error]
> ajp_service::jk_ajp_common.c (2559): (tomcat) connecting to tomcat failed.
> [Fri Jun 18 15:31:19.711 2010] [394:47652193829632] [info]
> jk_handler::mod_jk.c (2618): Service error=0 for worker=tomcat
>
> I took a look at the tomcat catalina.out and do not see any errors there.
> The CPU is empty and the RAM is available.
>
> I telnet to 127.0.0.1 port 8009 on the machine, I get a connection,
> so something is listening on the port.
>
> If I do a ps aux | grep java, I see two processes for tomcat which is
> normal.
>
> I checked the mysql log and do not see any errors.  I did a show innodb
> status and do not see any deadlocks in the database.
>
> I am attaching the properties for my jk configuation and a screen shot of
> the
> JK Status in case it helps.
>
> What is really strange is the JK Status page says -48 connections.  It seems
> like that number should always be positive or zero but not negative.

That should be unrelated (and yes: it's not OK).

Regards,

Rainer

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