mod_jk2, load balancing with two tomcats favors a single servlet engine

2003-11-18 Thread Bernhard Erdmann 
Hi,

running Apache 2.0.47 / mod_jk2 2.0.2 / Tomcat 4.1.24 on RedHat Linux 
8.0 with two instances of Tomcat having an identical webapps tree.

The second servlet engine never gets as many sessions as the first 
servlet engine. I wrote a script to record the session counter available 
from http://localhost:portno/manager/list.

How does mod_jk2 deliver the requests to the servlet engines?

== /var/log/tomcat1/session_count.log ==
Nov 18 14:29:00 58
Nov 18 14:30:00 65
Nov 18 14:31:00 65
Nov 18 14:32:00 84
Nov 18 14:33:01 88
Nov 18 14:34:00 86
Nov 18 14:35:00 83
Nov 18 14:36:00 77
Nov 18 14:37:01 60
Nov 18 14:38:00 62
== /var/log/tomcat2/session_count.log ==
Nov 18 14:29:00 17
Nov 18 14:30:00 16
Nov 18 14:31:00 19
Nov 18 14:32:00 27
Nov 18 14:33:01 25
Nov 18 14:34:00 25
Nov 18 14:35:00 27
Nov 18 14:36:00 28
Nov 18 14:37:01 20
Nov 18 14:38:00 21
== /opt/apache/conf/workers2.properties ===
[config:]
file=/opt/apache/conf/workers2.properties
debug=0
debugEnv=0
[shm:]
info=Scoreboard. Required for reconfiguration and status with 
multiprocess servers
file=/opt/tomcat/work/jk2.shm
size=100
debug=0
disabled=0

[workerEnv:]
info=Global server options
timing=1
debug=0
[channel.socket:localhost:8001]
info=Ajp13 forwarding over socket
debug=0
tomcatId=tomcat1
lb_factor=1
[channel.socket:localhost:8002]
info=Ajp13 forwarding over socket
debug=0
tomcatId=tomcat2
lb_factor=1
[status:]
info=Status worker, display runtime information
[uri:/jkstatus/*]
info=Display status information and checks the config file for changes
group=status:
[...some URI mappings...]

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Re: mod_jk2, load balancing with two tomcats favors a single servlet engine

2003-11-18 Thread David Rees 
Bernhard Erdmann wrote:
running Apache 2.0.47 / mod_jk2 2.0.2 / Tomcat 4.1.24 on RedHat Linux 
8.0 with two instances of Tomcat having an identical webapps tree.

The second servlet engine never gets as many sessions as the first 
servlet engine. I wrote a script to record the session counter available 
from http://localhost:portno/manager/list.

How does mod_jk2 deliver the requests to the servlet engines?
Unfortunately, this is a known problem as different Apache processes do 
not share load information (as I understand it).  Only workaround at 
this time is to adjust the lbfactor until you see the load distributed 
as expected.

-Dave

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