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From "Warner Godfrey" <war...@godfrey.name>
Subject Tomcat 4.1.12 - JK2 2.0.1 - IIS 5.0 & load balancing
Date Thu, 23 Jan 2003 03:31:57 GMT
Hello,

Is load balancing supported by the JK2 ISAPI filter (isapi_redirect2.dll)?

If it is I am running into problems getting load balancing to work with IIS!
I have successfully load balanced a cluster of Tomcat servers using the JK2
module for Apache2, but wen I try and port my configuration over to IIS I
get the following error in the Event Viewer Application Log:


--
Event Type: Warning
Event Source: Apache Jakarta Connector2
Event Category: None
Event ID: 2
Date:  23/01/2003
Time:  2:07:15 PM
User:  N/A
Computer: TOMCAT1
Description:
Error: [jk_isapi_plugin.c (489)]: HttpExtensionProc worker is NULL
--


I am not sure if there are subtle differences between the Apache2 JK2 module
and the JK2 ISAPI filter for IIS 5.0, but it seems as soon as you try and
reference a load balanced group using the 'uri.group' property in the
workers2.properties configuration file, everything goes pear shaped.
However, if I disable load balancing and reference a worker directly from
the 'uri.group' property, everything works fine!


Can anyone explain the reason for this error? I have included my JK2
configuration below:


-- workers2.properties --
[shm:]
info=Shared memory file. Required for reconfiguration and status with
multiprocess servers
file=c:/tomcat/work/jk2.shm
size=1000000

[logger.file:0]
level=DEBUG
file=c:/tomcat/logs/iis_jk2.log

[lb:lb]
info=Declaration of a load balanced group.
debug=0

[channel.socket:tomcat1:8009]
info=Forwarding over socket connection to tomcat1 instance.
host=tomcat1
port=8009
lbfactor=1
group=lb
tomcatId=tomcat1:8009

[ajp13:tomcat1:8009]
info=Ajp13 worker, connects to tomcat1 instance using AJP 1.3 protocol.
channel=channel.socket:tomcat1:8009
tomcatId=tomcat1:8009

[channel.socket:tomcat2:8009]
info=Forwarding over socket connection to tomcat2 instance.
host=tomcat2
port=8009
lbfactor=1
group=lb
tomcatId=tomcat2:8009

[ajp13:tomcat2:8009]
info=Ajp13 worker, connects to tomcat2 instance using AJP 1.3 protocol.
channel=channel.socket:tomcat2:8009
tomcatId=tomcat2:8009

[uri:/loadbalancing/SessionTest.jsp]
info=Sample JSP to test load balancing.
context=/loadbalancing
group=lb
--


Finally, my configuration is:
- Windows 2000
- Tomcat 4.1.12
- JK2 ISAPI filter 2.0.1 (binary version downloaded from
<http://jakarta.apache.org/builds/jakarta-tomcat-connectors/jk2/release/v2.0
.1/bin/win32/isapi_redirector2.dll>)
- IIS 5.0



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