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From Alessandro Bahgat <>
Subject Re: Tomcat 6.0.16 + mod_jk 1.2.19 - request threads hanging up
Date Sat, 12 Dec 2009 12:26:43 GMT
On Fri, Dec 11, 2009 at 4:27 PM, Rainer Jung <> wrote:
> On 09.12.2009 12:18, Pid wrote:
>> It could be, but while you're upgrading you might consider upgrading
>> HTTPD to the best available version too, 2.0.52 release date: 1 Oct
>> 2004. (That's 35 internet years ago.)
> ... and mod_jk 1.2.19 dates back to September 2006, so according to your
> math 21 internet years ago. There were so many bugs fixed since then, that
> you'll hardly find anyone that really tries to help debugging those old
> versions. At least use a recent mod_jk and look at
> for some important hints about configuration.

Thank you both for your advice. I'm pushing towards upgrading the
Apache+mod_jk stack as well.
Our last tests with the latest Tomcat and mod_jk still showed a lot of
CPU time being spent in sendbb methods, with some threads being stuck
in that method for long time.

We actually found out a lot of "unrecoverable error 200, request
failed" error messages in the mod_jk log (roughly around 1k per hour),
so I'm starting to wonder if there's any issue with the firewalls and
the network infrastructure. What would you think about that?

[Thu Dec 03 16:58:52 2009][31539:42688] [info]
service::jk_lb_worker.c (873): unrecoverable error 200, request
failed. Client failed in the middle of request, we can't recover to
another instance.
[Thu Dec 03 16:58:52 2009][31539:42688] [info]  jk_handler::mod_jk.c
(2056): Aborting connection for worker=applprod
[Thu Dec 03 16:58:53 2009][31612:42688] [info]
jk_open_socket::jk_connect.c (450): connect to XXX.XXX.XXX.XXX:8009
failed with errno=111
[Thu Dec 03 16:58:53 2009][31612:42688] [info]
ajp_connect_to_endpoint::jk_ajp_common.c (872): Failed opening socket
to (XXX.XXX.XXX.XXX:8009) with (errno=111)
[Thu Dec 03 16:58:53 2009][31612:42688] [info]
ajp_send_request::jk_ajp_common.c (1247): (applprod05) error
connecting to the backend server (errno=111)
[Thu Dec 03 16:58:53 2009][31612:42688] [info]
ajp_service::jk_ajp_common.c (1867): (applprod05) sending request to
tomcat failed,  recoverable operation attempt=1

Thank you for your help,

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