Load Balancing - OC4J - J2EE

Hello,
I am trying to do software load balancing on the Applicatoin tier of Oracle Apps 11.5.9 (which uses 9iAS version 2.0, I suppose)
Going thru the follow metalink documents ---
Configuring Multiple OC4J Instances as a High Availability Cluster
(http://metalink.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=175593.1)
Running Multiple OC4J Instances From a Single Install of 9iAS 1.0.2.2
(http://metalink.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=153325.1)
But I am unable to find the directory 'j2ee' in 9iAS ORACLE_HOME wherein I need to modify the configuration files
Is there any version probelm
Or something that I am doing wrong
Please let me know
Thanks and Regards,
Pooja

Pooja,
I am unable to find the directory 'j2ee' in 9iAS
ORACLE_HOMEThat's because ORACLE_HOME for 9iAS is different to ORACLE_HOME for the Oracle database (server).
On our SUN [sparc] Solaris 9 machine:
[9iAS] ORACLE_HOME = /u/app/oracle/product/ias
[9i Database] ORACLE_HOME = /u/app/oracle/product/9.2.0
And the "j2ee" subdirectory is under "/u/app/oracle/product/ias"
Good Luck,
Avi.

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Hi Linwood,
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Hi Ravi,
Check this forum:
/thread/24959 [original link is broken]
Load Balancing for J2EE Web Applications
http://help.sap.com/saphelp_nw04/helpdata/en/ce/4522d557b26942b202e05ff9ee1f3a/frameset.htm
SAP Web Dispatcher - Load balancing EP6.0 SP2
/thread/19304 [original link is broken]
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Hi Experts!!
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Hi Ravi,
Check this forum:
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Load Balancing on OC4J standalone

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Hello All,
Is there a way to perform Load Balancing Oracle BI Presenation Server the way we do with IIS (defining in ISAPIConfig.XML file)?
I am looking some pointers towards Clustering/Load Balancing Oracle BI Presentation Servers using OC4J not IIS.
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Thanks , the Oracle BI Presentation Server is running now ,but still the oc4j display the below error :-
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OC4J load balancing

We got multiple JVMs configured and running. Since we are not able to share the session among the JVMs we are having issue running the application on mutiple JVM since the OC4J is doing the load balancing. For example, if request is established on one JVM the next request is sent to another thus the application fails by not finding the session object. Is there a way we can have the sticky on OC4J so that if the session is established on one JVM then continue to use that JVM through out the life cycle of the session. Another word load balance only if the request is new. Thanks in advance for your help.

Okay, how about if you have multiple web application that are sharing the session.
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See here for more details:
http://coherence.oracle.com/display/COH34UG/Coherence*Web+Session+Management+Module
http://coherence.oracle.com/display/COH34UG/Coherence*Web+Session+and+Session+Attribute+Scoping
-steve-

Load balancing HTTP requests for an OC4J instance w/multiple JVMs

Hello everyone,
I am using OAS 10.1.3.1 and wish to load balance HTTP requests across an OC4J group of one or more OC4J instances, where each like named OC4J instance may have multiple JVMs or it may just have one JVM.
My mod_oc4j.conf file would contain the following directives :
Oc4jSelectMethod roundrobin:local
Oc4jRoutingMode Static
Oc4JMount /xyz/* xyz
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What I have seen is that the subsequent request is sent back to the same JVM that issued the sendRedirect(). I also call invalidate() against the HttpSession prior to calling sendRedirect(), but that does not seem to affect the behavior that I see.
In the full blown case, I would have an OC4J group with a cluster size > 1, and each of those OC4J instances would have at least one JVM. In that case, I wish the sendRedirect() call to allow the subsequent request to be sent to any one of the OC4J instances in the group, and any one of those JVMs within all of those OC4J instances.
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Thank you,
Doug

I should clarify that in the full blown environment, the OC4J instances that form a group will each be housed within a separate OAS instance that resides on its own machine.
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Thanks,
Doug

Web dispatcher and J2EE load balancing

I have portal DBCI on one server and DI on multiple servers. I implemented Web dispatcher in front of the DI and it does the load balancing across all DI and CI. What I want to do though is not to route any users to CI instance - ie take CI server processes out of load balancing.
In ABAP environment you could create a logon group and not put CI in the group and users coming through the logon group do not go to the CI. I would like to do the same with Portal Java processes. In help.sap.com I found that web dispatcher uses default !J2EE group if there are no groups defined - to distribute users but I can not find anyway to define a logon group for J2EE java.
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> Raj,
>
> Which versions are you on J2EE? EP?
> If you are on EP SP14 or NW01 you can do workload
> distribution within the portal.
>
> James
We are using NW 04 based EP 6 SP 16. I am looking for to use web dispatcher to distribute users on the DI servers and not distribute any users on the CI server. What can I do so that if admin user enter http://CI_server:50000/irj then they can login to the CI server if users come through webdispatcher then they are not put on the CI but go to one of the DI servers only. By default web dispatcher would send some users to CI and I don't want that.

Load balancing in OC4J

I have a configuration where I can see in the EM two instances of the xmlpserver (I am not sure how this was done).
Is there load balancing in OC4J itself, where a request would be directed to either instance? If this is happening, then I assume that session affinity is maintained by cookies.
The problem that I am having is that I am using a SOAP Client to access the services available from xmlpserver. The client does not support cookies so when I make a call to login, I get back a token in the response and my subsequent calls should use that login. But What is happening is that the calls are alternating between the two instances and the calls are failing because the user session is not created in both instances.
Is there a configuration in OC4J to say that only a particular instance should always handle all the soap calls?
Thanks

C:\product\10.1.3.1\OracleAS_1\opmn\bin>opmnctl status
Processes in Instance: SOA1013.stbde01.us.oracle.com
--------------------------------------------------------------+---------
ias-component | process-type | pid | status
--------------------------------------------------------------+---------
OC4JGroup:default_group | OC4J:bixmlpserver | 7640 | Alive
OC4JGroup:default_group | OC4J:bianalytics | 4632 | Alive
OC4JGroup:default_group | OC4J:bijmx | 3204 | Alive
OC4JGroup:default_group | OC4J:home | 2792 | Alive
ASG | ASG | N/A | Down
HTTP_Server | HTTP_Server | 7912 | Alive
C:\product\10.1.3.1\OracleAS_1\opmn\bin>opmnctl @cluster status
Processes in Instance: SOA1013.stbed37.us.oracle.com
--------------------------------------------------------------+---------
ias-component | process-type | pid | status
--------------------------------------------------------------+---------
OC4JGroup:default_group | OC4J:bixmlpserver | 4112 | Alive
OC4JGroup:default_group | OC4J:bijmx | 4008 | Alive
OC4JGroup:default_group | OC4J:home | 8008 | Alive
ASG | ASG | N/A | Down
HTTP_Server | HTTP_Server | 6700 | Alive
Processes in Instance: SOA1013.staid06.us.oracle.com
--------------------------------------------------------------+---------
ias-component | process-type | pid | status
--------------------------------------------------------------+---------
OC4JGroup:default_group | OC4J:bianalytics | 5304 | Alive
OC4JGroup:default_group | OC4J:bijmx | 5324 | Alive
OC4JGroup:default_group | OC4J:home | 1768 | Alive
ASG | ASG | N/A | Down
Processes in Instance: SOA1013.stbde02.us.oracle.com
--------------------------------------------------------------+---------
ias-component | process-type | pid | status
--------------------------------------------------------------+---------
OC4JGroup:default_group | OC4J:bianalytics | 2528 | Alive
OC4JGroup:default_group | OC4J:bijmx | 2400 | Alive
OC4JGroup:default_group | OC4J:home | 2424 | Alive
ASG | ASG | N/A | Down
Processes in Instance: SOA1013.stbde01.us.oracle.com
--------------------------------------------------------------+---------
ias-component | process-type | pid | status
--------------------------------------------------------------+---------
OC4JGroup:default_group | OC4J:bixmlpserver | 7640 | Alive
OC4JGroup:default_group | OC4J:bianalytics | 4632 | Alive
OC4JGroup:default_group | OC4J:bijmx | 3204 | Alive
OC4JGroup:default_group | OC4J:home | 2792 | Alive
ASG | ASG | N/A | Down
HTTP_Server | HTTP_Server | 7912 | Alive
Time: 9:26 AM PST
Thanks
Richard

Load Balancing OBIEE using OC4J

Hi All,
I would like to know if there is a way of load balancing 2 instances of OBIEE using OC4J.
Please advice if possible and the steps required to achieve that.
A small correction ... we have 2 instance of OBIEE and 2 of stand alone of OC4J
Is there any way we can attempt to load balance the two???
Regards,
maabajaber
Edited by: maabajaber on Sep 22, 2010 4:19 AM

Hi All,
A small correction ... we have 2 instance of OBIEE and 2 of stand alone of OC4J.
I believe OC4J stand alone can do this but i dont know how
Is there any way we can attempt to load balance the two.
Regards,
maabajaber

Load Balance on OC4J

Hi,
I want to run same application on n number of servers, how can i redirect request to another server ( How can I implement Load Balancing on OC4J?), kindly, write me the proper syntext/command of loadbalancing and content of the .xml file.
Thanks!
K.G.Sharma

If you are using OC4J 1.0.2.2.x then you can follow the instructions in the Getting Started Guide at http://otn.oracle.com/docs/tech/java/oc4j/htdocs/getstart.htm#1015479 to configure loadbalancing and clustering in OC4J.
In Oracle9iAS Release 2, load balancing and clustering is performed using OHS and mod_OC4J. Please look at http://otn.oracle.com/docs/products/ias/doc_library/90200doc_otn/core.902/a92171/cluster.htm#1006053
Oracle9iAS Release 2 on Windows plaform will be released very soon within 2-3 weeks.
regards
Debu

Session replication in oc4j load balancing not working ..

Hi All,
I have windows 2000 machine. I have installed 2 instances of oc4j running on ports 8888 and 8889. I started the loadbalancer.jar in the first instance, started the first oc4j instance and then started the second oc4j instance. I have a common application deployed on both instance1 and instance2 and that is nothing but out famous SessionServlet.
If I access this servlet using http://localhost:80/app/servlet/SessionServlet then I am getting a count as 1 . My loadbalancer that is started from first oc4j instance(running on port 8888) is showing that the request is routed to the first instance. I stopped my first instance1 and then again from the same browser/session/client if I access the same servlet using http://localhost:80/app/servlet/SessionServlet then still I am seeing the count as 1 instead of 2 . At this point my loadbalancer is showing that the request is routed to the second oc4j instance(running on port 8889) since first instance is stopped. So why am I seeing the count as 1 instead as 2.
Also,
1. Is it enough that we start the loadbalancer.jar in the first oc4j instance. What about the loadbalancer.jar in the second oc4j instance ?
2. We all know that Apache HTTP Server runs on port 80. But since I didnt[i]Long postings are being truncated to ~1 kB at this time.

thank you debu, I have one doubt . In the clustering/load-balancing documentation at metalink(doc id: 151717.1) it is said that in point 4b that we should add the tag <cluster-config /> to orion-web.xml file but this file will be created only after the web application is deployed and it is accessed atlest for one time. So is it that we should first deploy the web application and then access it for atlest one time then stop the server and add this tag .. or is there any other way workaround ?

Monitoring oc4j load balancing

Hi
We are using mod_oc4j to load balance our OC4J_BI_Forms application between 3 application servers. Is it possible to monitor those servers ? Can i add or remove servers "on the fly" without restarting the servers?
We use 9iAS rel 2 with Windows 2000
Regards,
Louis

Thanks for the post. We had a little difficulty getting enough specifics out of the documentation to answer all our questions. But opened a TAR and got a good engineer who worked with us to get a custom load balancing solution that is working very well for us.
Thanks again,
Tony
For others out there that are interested, we ended up with a very simple load balancing setup that simply requires that the mod_oc4j.conf be modified to group the containers.
From Oracle:
To implement the solution, please execute the following steps:
1. Deploy application into different containers with the same application name.
2. Modify the mod_oc4j.conf as follows:
Oc4jMout /test <oc4j instance 1>, <oc4j instance 1>,...

Oc4j load balancing AS 101202

Can anyone point me to some good documentation for configuring load balancing for oc4j instances?
I've seen a lot on metalink, but all dated back to 2002. I was hoping there was some new documentation for 10gR2.
I'm trying to load balance 3 webservice OC4J instances which each point to different API servers as the API servers themselves are single threaded.
Thanks for the assistance,
Tony

Thanks for the post. We had a little difficulty getting enough specifics out of the documentation to answer all our questions. But opened a TAR and got a good engineer who worked with us to get a custom load balancing solution that is working very well for us.
Thanks again,
Tony
For others out there that are interested, we ended up with a very simple load balancing setup that simply requires that the mod_oc4j.conf be modified to group the containers.
From Oracle:
To implement the solution, please execute the following steps:
1. Deploy application into different containers with the same application name.
2. Modify the mod_oc4j.conf as follows:
Oc4jMout /test <oc4j instance 1>, <oc4j instance 1>,...

Load Balancing - OC4J - J2EE

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