I haven't actually - I will turn it on and restart the server tonight.
Another thing that I find strange is the apache (using prefork MPM)
seems to keep increasing the number of child processes. For example,
when I run:
service httpd status
httpd (pid 31093 31055 31048 31047 31046 31045 31044 31043 31042 31036
30922 30919 30860 30853 30769 30753 30733 30728 30690 30684 30653
30652 30637 30555 30440 30439 30438 30421 30383 30348 30312 30310
30309 30271 30177 30158 30157 30086 30063 30057 29906 29905 29904
29796 29795 29794 29793 29791 29790 29701 29639 29638 29633 29600
29547 29530 29529 29491 29489 29480 29443 29442 29441 29440 29397
29396 29394 29358 29357 29351 29304 29270 29191 29190 29184 29138
29137 29116 29115 29051 29012 29007 29002 28966 28959 28957 28911
28904 28903 28897 28893 28848 28809 28807 28796 28790 28782 28773
28734 28719 28645 28544 28543 28542 28475 28474 28473 28471 28470
28428 28403 28365 28363 28325 28319 28318 28316 28315 28314 28271
28269 28228 28184 28183 28138 28132 28125 28063 28022 28016 28015
28014 28013 28011 27968 27966 27965 27964 27963 27882 27836 27815
27777 27776 27689 27688 27687 27672 27671 27617 27615 27610 27568
27567 27560 27559 27523 27522 27521 27477 27476 27475 27474 27473
27467 27466 27465 27464 27457 27456 27455 27454 26439 26222 26045
26003 25855 25854 25853 25852 25851 25850 25849 25848 25846) is
running...
the number of processes is always increasing....
Thanks,
Ian Long
Chief Software Architect, Opterus Inc.
Email: ian.l...@opterus.com
Phone: 416-840-8495 x666
Mobile: 416-817-9206
Web: http://www.opterus.com
On 5-Mar-09, at 1:32 PM, Anthony J. Biacco wrote:
Have you counted the actual # of requests for both apaches via
something
like server-status, or looked in mod_jk.log, that they are both
receiving an equal # of successful requests?
The "Writing to client aborted or client network problems" are nothing
to really worry about. They usually mean the browser/client has closed
the connection (clicked Stop or clicked Back) before the request was
done being processed/sent.
-Tony
---------------------------
Manager, IT Operations
Format Dynamics, Inc.
303-573-1800x27
abia...@formatdynamics.com
http://www.formatdynamics.com
-----Original Message-----
From: Ian Long [mailto:ian.l...@opterus.com]
Sent: Thursday, March 05, 2009 10:57 AM
To: users@tomcat.apache.org
Subject: Tomcat and Apache with mod_jk
Hi,
I have dedicated RHEL5 boxes (dedicate quad core, 4GB RAM) setup with
both apache httpd and tomcat running on the same box, with a hardware
load balancer selecting the node a user is routed to. I have mod_jk
setup, but am seeing some behaviour I'm not sure is correct. This is
on httpd 2.2.3, tomcat 6.0.16, and mod_lk version of 1.2.26. The load
balancer pings the machines every 2 seconds as part of a health check.
Below are the relevant bits of my configuration:
mod_jk.conf
==========
LoadModule jk_module modules/mod_jk.so
JkLogFile /var/log/httpd/mod_jk.log
JkLogLevel info
JkWorkersFile /etc/httpd/conf.d/workers.properties
JkShmFile /var/log/httpd/jk.shm
JkShmSize 800
JkOptions +ForwardURICompatUnparsed
JkMount /* ajp13
JkUnMount /cacti/* ajp13
JkUnMount /manager/* ajp13
workers.properties
==============
worker.list=ajp13
worker.ajp13.port=8009
worker.ajp13.host=localhost
worker.ajp13.maintain=60
worker.ajp13.type=ajp13
# worker.ajp13.connection_pool_minsize=0
worker.ajp13.connection_pool_timeout=600
worker.ajp13.connect_timeout=10000
worker.ajp13.prepost_timeout=10000
worker.ajp13.max_packet_size=16384
httpd.conf
========
<IfModule prefork.c>
StartServers 8
MinSpareServers 5
MaxSpareServers 20
ServerLimit 800
MaxClients 800
MaxRequestsPerChild 0
</IfModule>
server.xml
========
<Connector port="8009" connectionTimeout="600000"
minSpareThreads="5" packetSize="16384" address="127.0.0.1"
enableLookups="false" disableUploadTimeout="true"
maxSpareThreads="75" maxThreads="800" protocol="AJP/1.3" />
On one machine, after 5 or 6 hours, when I run netstat to look at
connections between http and tomcat, I have 250 or so:
tcp 0 0 ::ffff:127.0.0.1:8009 ::ffff:
127.0.0.1:60408 ESTABLISHED
whereas the other machine only has 40 or so, and they are equally load
balanced. I tried setting worker.ajp13.connection_pool_minsize=0 but
this has no effect on what I'm seeing.
Is this the behaviour I should expect? The load on the machine is not
that heavy, at the busiest period there would be 3 request per second
going to the box.
I wouldn't expect this number to keep growing, especially under light
load.
I'm also seeing a few errors like the following in mod_jk.log:
[Thu Mar 05 10:34:08.878 2009] [25849:3086382864] [info]
ajp_process_callback::jk_ajp_common.c (1603): Writing to client
aborted or client network problems
[Thu Mar 05 10:34:08.878 2009] [25849:3086382864] [info]
ajp_service::jk_ajp_common.c (2186): (ajp13) sending request to tomcat
failed (unrecoverable), because of client write error (attempt=1)
[Thu Mar 05 10:34:08.878 2009] [25849:3086382864] [info]
jk_handler::mod_jk.c (2357): Aborting connection for worker=ajp13
[Thu Mar 05 10:34:28.527 2009] [26222:3086382864] [info]
ajp_process_callback::jk_ajp_common.c (1603): Writing to client
aborted or client network problems
[Thu Mar 05 10:34:28.527 2009] [26222:3086382864] [info]
ajp_service::jk_ajp_common.c (2186): (ajp13) sending request to tomcat
failed (unrecoverable), because of client write error (attempt=1)
[Thu Mar 05 10:34:28.528 2009] [26222:3086382864] [info]
jk_handler::mod_jk.c (2357): Aborting connection for worker=ajp13
[Thu Mar 05 10:36:01.071 2009] [25855:3086382864] [info]
ajp_process_callback::jk_ajp_common.c (1603): Writing to client
aborted or client network problems
[Thu Mar 05 10:36:01.072 2009] [25855:3086382864] [info]
ajp_service::jk_ajp_common.c (2186): (ajp13) sending request to tomcat
failed (unrecoverable), because of client write error (attempt=1)
[Thu Mar 05 10:36:01.072 2009] [25855:3086382864] [info]
jk_handler::mod_jk.c (2357): Aborting connection for worker=ajp13
[Thu Mar 05 11:53:42.298 2009] [27523:3086382864] [info]
ajp_process_callback::jk_ajp_common.c (1603): Writing to client
aborted or client network problems
[Thu Mar 05 11:53:42.298 2009] [27523:3086382864] [info]
ajp_service::jk_ajp_common.c (2186): (ajp13) sending request to tomcat
failed (unrecoverable), because of client write error (attempt=1)
[Thu Mar 05 11:53:42.298 2009] [27523:3086382864] [info]
jk_handler::mod_jk.c (2357): Aborting connection for worker=ajp13
[Thu Mar 05 12:08:07.551 2009] [28365:3086382864] [info]
ajp_process_callback::jk_ajp_common.c (1603): Writing to client
aborted or client network problems
[Thu Mar 05 12:08:07.551 2009] [28365:3086382864] [info]
ajp_service::jk_ajp_common.c (2186): (ajp13) sending request to tomcat
failed (unrecoverable), because of client write error (attempt=1)
[Thu Mar 05 12:08:07.551 2009] [28365:3086382864] [info]
jk_handler::mod_jk.c (2357): Aborting connection for worker=ajp13
[Thu Mar 05 12:08:17.432 2009] [28428:3086382864] [info]
ajp_process_callback::jk_ajp_common.c (1603): Writing to client
aborted or client network problems
[Thu Mar 05 12:08:17.432 2009] [28428:3086382864] [info]
ajp_service::jk_ajp_common.c (2186): (ajp13) sending request to tomcat
failed (unrecoverable), because of client write error (attempt=1)
[Thu Mar 05 12:08:17.433 2009] [28428:3086382864] [info]
jk_handler::mod_jk.c (2357): Aborting connection for worker=ajp13
[Thu Mar 05 12:12:19.656 2009] [28363:3086382864] [info]
ajp_process_callback::jk_ajp_common.c (1603): Writing to client
aborted or client network problems
[Thu Mar 05 12:12:19.656 2009] [28363:3086382864] [info]
ajp_service::jk_ajp_common.c (2186): (ajp13) sending request to tomcat
failed (unrecoverable), because of client write error (attempt=1)
[Thu Mar 05 12:12:19.657 2009] [28363:3086382864] [info]
jk_handler::mod_jk.c (2357): Aborting connection for worker=ajp13
Can anyone see anything wrong with the configuration?
Cheers,
Ian Long
Chief Software Architect, Opterus Inc.
Email: ian.l...@opterus.com
Phone: 416-840-8495 x666
Mobile: 416-817-9206
Web: http://www.opterus.com
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