Hello all,
I'm seeing frequent cases where requests sent via mod_jk to Tomcat will
hang indefinitely. The request will never return to Apache and the
client will eventually time out. There are no error messages.
In my test case I run wget against various URLs until the hang occurs
(usually within 2-3 minutes). Here are the last few entries from my
mod_jk.log file (JkLogLevel = trace):
[Thu Dec 04 13:28:08.509 2008] [27224:1] [debug]
ajp_connection_tcp_send_message::jk_ajp_common.c (911): 00c0 FF 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 - ................
[Thu Dec 04 13:28:08.510 2008] [27224:1] [trace]
ajp_connection_tcp_send_message::jk_ajp_common.c (928): exit
[Thu Dec 04 13:28:08.510 2008] [27224:1] [debug]
ajp_send_request::jk_ajp_common.c (1325): (ajp13) request body to send 0
- request body to resend 0
[Thu Dec 04 13:28:08.511 2008] [27224:1] [trace]
ajp_send_request::jk_ajp_common.c (1422): exit
[Thu Dec 04 13:28:08.511 2008] [27224:1] [trace]
ajp_get_reply::jk_ajp_common.c (1613): enter
[Thu Dec 04 13:28:08.511 2008] [27224:1] [trace]
ajp_connection_tcp_get_message::jk_ajp_common.c (953): enter
Beyond this point there is no activity. There are never any error
messages generated, not in mod_jk.log, catalina.out, nor in the Apache logs.
There is a thread dump of Tomcat (after the hang begins) at:
http://www.mdibl.org/~mcmorran/tomcat_thread_dump.txt
This is a pretty simple setup, both Apache & Tomcat are running on the
same host, so there is no firewall issue. No load balancing, just one
worker defined.
workers.properties file:
worker.list=ajp13
worker.ajp13.type=ajp13
worker.ajp13.host=localhost
worker.ajp13.port=8009
worker.ajp13.socket_timeout=120
(have tried with and without the socket_timeout parameter - makes no
difference)
My server.xml file is at:
http://www.mdibl.org/~mcmorran/server.xml.txt
(I've tried various settings (or none) for connectionTimeout inside the
AJP connector - makes no difference)
mod_jk related parts of my httpd.conf file are at:
http://www.mdibl.org/~mcmorran/httpd.conf.txt
Version info:
Server: Solaris 10
Apache: 2.2.6
mod_jk: 1.2.25
Tomcat: 6.0.14
libtcnative: 1.10
Java: 1.5.0_14
I'm running Tomcat under jsvc. The JVM gets 2G of memory (there are 8G
total on the system) - I don't think there's any memory issue. I'm in
test mode so I'm the only user; there's virtually no CPU load on the box.
I've reached a dead end here -I'm hoping someone on the list may have
some ideas. Thanks for any help you may be able to provide.
Cheers,
Roy
--
Roy McMorran
Systems Administrator
MDI Biological Laboratory
[EMAIL PROTECTED]
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
