Load balancing OHS-OC4J

Hi there
I've 2 servers OAS 10.1.2 with the same kind of installation.
First box: OHS + OC4J
mod_oc4j.conf:
<IfModule mod_oc4j.c>
Oc4jSelectMethod roundrobin
Oc4jMount /Forms/* instance://ip1:6200, ip2:6200
Second box: OHS + OC4J
mod_oc4j.conf:
<IfModule mod_oc4j.c>
Oc4jSelectMethod roundrobin
Oc4jMount /Forms/* instance://ip1:6200, ip2:6200
is it correct ?
Regards
Moosy

And how are you load balancing requests to both boxes? Are you front-ending it with Web Cache?

Similar Messages

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

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 on OC4J standalone

Ola,
We are setting up a system with 2 Apache web servers and 2 hosts for Oracle Containers for Java. At first, > we will be using stand-alone oc4j. Web servers load balancing will be implemented via hardware. Our
question is about high availability with oc4js, and searching through the OTN forum database, we found a
very similar problem with Zhen Kun Cua (how can i use the nested table in form 6i but no answer
was given.
How can we replicate Load Balancers (we are using oc4js loadbalancer.jar) as to save the system from going > down with a crash of the first load balancer? Also, is there another way of clustering oc4j stand-alone
without using this load balancer? We might be using another hardware load balancer for the containers.
Any help would be much appreciated.
Thanks you in advance,
Joco Bosco

For OC4J questions, try the J2EE forum Products>Application Server > J2EE.
Thanks,
Ashesh Parekh

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>,...

For a true load balancing and high-availability OHS, OPMN, and mod_oc4j

i have read this link of Enabling Clustering on oc4j9.0.4 standalone app server
http://www.oracle.com/technology/docs/tech/java/oc4j/htdocs/getstart.htm#1015479
To test the clustering, start up the load balancer by executing "java -jar loadbalancer.jar".
C:\OC4J_EXTENDED\j2ee\home>java -jar loadbalancer.jar
In a future release of Oracle Application Server, loadbalancer.jar will be
desupported. Because of this, we strongly suggest that you discontinue your use
of loadbalancer.jar in this release. Under high loads, loadbalancer.jar may not
function properly. For a true load balancing and high-availability solution,
please move to use OHS, OPMN, and mod_OC4J. For more information, please see
http://otn.oracle.com/products/ias/ohs/content.html
Balancer initialized...
what load balancer should i use for web clustering
<frontend host="balancer-host" port="balancer-port" />
balancer-host=localhost
balancer-port=80
for all nodes i mentioned same host and port in http-web-site.xml.Is it correct?
i completed all the steps and run http://localhost:6666/session/SessionServlet
i hit 3 times
in the different browser http://localhost:7777/session/SessionServlet
instead of coming 4 it starting from 1 only.

can i use this loadbalancer.jar or not?
how to mod_oc4j in standalone app server

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
In the degenerate case, I would like to have an OC4J group with a cluster size of one, and have that one OC4J instance have two or more JVMs. I would like to be able to receive a request within my web application, determine that the JVM that has been sent the request is the wrong JVM to process the request, and then call HttpServletResponse.sendRedirect("/xyz"). Then, when the browser receives the HTTP 302 response and issues the subsequent HTTP request, have that request sent to a different JVM than the previous JVM that issued the sendRedirect().
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.
Can anyone verify that my mod_oc4j mount directive is appropriate given the select method and routing mode? What else might I need to do to have a chance to have a different JVM respond to the request that results from a sendRedirect()?
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.
So ideally, a request could be inbound to say OAS instance 1 on machine A, OC4J instance AA, JVM 2, and I need to force a redirect so that the request can actually be serviced by OAS instance 3 on machine C, OC4J instance AA, JVM 1, and I need to be able to call sendRedirect() against an HttpServletResponse from within a JVM until the subsequent request from the browser, Internet Explorer in my case, is serviced by that JVM.
Thanks,
Doug

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.

Load Balancing Oracle BI Presentation Server with OC4J

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.
Thank you.

Thanks , the Oracle BI Presentation Server is running now ,but still the oc4j display the below error :-
C:\OracleBI\oc4j_bi\bin>oc4j.cmd -start
Starting OC4J from C:\OracleBI\oc4j_bi\j2ee\home ...
10/05/06 13:58:31 Error initializing server: /C:/OracleBI/oc4j_bi/j2ee/home/conf
ig/server.xml, Fatal error at line 1 offset 1 in file:/C:/OracleBI/oc4j_bi/j2ee/
home/config/server.xml: .<Line 1, Column 1>: XML-20108: (Fatal Error) Start of r
oot element expected.
10/05/06 13:58:31 Fatal error: server exiting

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

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

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.
Is there a way we could say these web application should be running on the same JVM? If you mean by this that you have different WAR files (either standalone or contained in an EAR file) that need to share common session state, then we don't support this with OC4J. A session is bounded within the Web module that it is created within. I think someone on here had come up with a way to do once before it using a different cookie name and a common cookie path but its not something we do by default.
Do you know how to configure them to run on the same JVM. Would parent work?
Could we make one web app parent for others - if so would it guarantee to run the the same JVM?The parent config doesn't dictate any runtime behaviour -- it's configuration, classloading based parenting only.
We have a scenario where our web applications are dependent upon each other - meaning they need to run on the same JVM together since they are sharing the session. It sounds to me that if you have this sort of requirement, then it'd be worth your while looking at our Coherence*Web functionality. This provides a way to allow the Coherence distributed cache to be used as the session/session-replication infrastructure -- effectively switching out the native session manager from OC4J (and other J2EE servers, Tomcat, etc.).
It has a switch that enables cross Web module state sharing. Because it's a distributed cache too, it will allow all JVMs to see/use the same view of the current session state.
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-

A question about oc4j load balancing/ failover behaviour

Hi
I have been trying to set up load balancing using 9.0.2 standalone oc4j instances that share sessions.
- I set up two oc4j instances (say oc4j1 and oc4j2) pointing to a load balancer entering the following in <J2EE_HOME>config\http-web-site.xml:
<web-site host="<ip>" port="<port>" display-name="Oracle 9iAS Java HTTP WebSite" cluster-island="1" >
and
<frontend host="<host>" port="80" />
- I entered <cluster-config/> and <session-tracking/> in each oc4j instance's orion-web.xml, and <distributable/> in their web.xml files.
- I started the loadbalancer(java -jar loadbalancer.jar -debug) and the oc4j instances.
Everything works fine up to a point. They are both added to the cluster and the debug messages show that requests are being routed to oc4j1 and cluster session value update messages are sent by oc4j1 and received by oc4j2. When I shut down oc4j1 requests are routed to oc4j2 and session information is maintained.
However, when I start up oc4j1 again, it does not appear to be receiving the session value updates now being sent by oc4j2 so if I now shut down oc4j2 the session is lost. Can anyone please tell me what I have missed?
Thanks in advance
- Al

Hi
I have been trying to set up load balancing using 9.0.2 standalone oc4j instances that share sessions.
- I set up two oc4j instances (say oc4j1 and oc4j2) pointing to a load balancer entering the following in <J2EE_HOME>config\http-web-site.xml:
<web-site host="<ip>" port="<port>" display-name="Oracle 9iAS Java HTTP WebSite" cluster-island="1" >
and
<frontend host="<host>" port="80" />
- I entered <cluster-config/> and <session-tracking/> in each oc4j instance's orion-web.xml, and <distributable/> in their web.xml files.
- I started the loadbalancer(java -jar loadbalancer.jar -debug) and the oc4j instances.
Everything works fine up to a point. They are both added to the cluster and the debug messages show that requests are being routed to oc4j1 and cluster session value update messages are sent by oc4j1 and received by oc4j2. When I shut down oc4j1 requests are routed to oc4j2 and session information is maintained.
However, when I start up oc4j1 again, it does not appear to be receiving the session value updates now being sent by oc4j2 so if I now shut down oc4j2 the session is lost. Can anyone please tell me what I have missed?
Thanks in advance
- Al

Load Balancing Reports Server

I am supporting an app server for a Forms & Reports application that uses run_report_object to run reports on a Reports Server. This is on 10gR2 (10.1.2.0.2) on Solaris & Linux.
Currently running multiple standalone Reports Servers on a single server (for 3 different projects). Need to prevent one project from affecting another as much as possible (yes, I know they are on the same box....).
I have a requirement to ensure that a hanging Reports Server doesn't prevent other jobs from running. I see that Reports Server clustering is no longer an option. The Reports documentation about how to implement HA basically say just read the AS docs and figure it out. The problem is that using the AS J2EE HA means that you'd HAVE to use the Reports Servlet. Additionally, I don't see how the reports servlet could be called so that more than one Reports server would be used.
I keep hearing about an impending doc about implementing HA on Reports. When is it coming?
Future environments will be multiple AS installs on separate boxes accessing a RAC DB.
So, what's the scoop? How can I implement this?
So, here are my questions:
1. (Two Servers) I believe I could do this on two servers if I had the same Reports Server name on each. If so, could I have two OC4J containers on each server both with the same mount point for the rwservlet application? What else would I need to do to tell OHS to load balance between both since they have the same name.
2. (Two Servers) If 1 above is okay, would it be possible to have two OC4J containers point to two different standalone Reports Servers?
3. (One Server) Can I start up multiple Reports Servers on same box with the same name (I'm pretty sure this is no :-) )
4. (One Server) Like 2 above except on a single server. Two independent OC4J containers accessing two different servlets. Each has a default Reports Server setup. URL would look the same from each.
I'm kind of graping for straws here on how to move ahead. I'm surprised the Reports Server clustering was taken away, but I suspect it is because the underlying Visibroker architecture was changed and there weren't the resources required to redo this. I'm not sure that is a good thing.
Any help would be appreciated.
:-) Steve

Say you have two servers where you configured Reports, i.e. either in full Enterprise Edition or in AS10g Forms&Reports standalone.
For example:
ServerA.oracle.com with port 7777
ServerB.oracle.com with port 7777
Without using a load balancer you would call a Report with:
http://ServerA.oracle.com:7777/reports/rwservlet?report=test.rdf&userid=scott/tiger@orcl&destype=cache&desformat=htmlcss
http://ServerB.oracle.com:7777/reports/rwservlet?report=test.rdf&userid=scott/tiger@orcl&destype=cache&desformat=htmlcss
Now you put a load balancer in front of them and assign it the virtual name:
reports.oracle.comNow you can call Reports with this URL:
http://reports.oracle.com:7777/reports/rwservlet?report=test.rdf&userid=scott/tiger@orcl&destype=cache&desformat=htmlcss
To make it more interesting you create a specific Reports Server on ServerA called repserver_a and on ServerB: repserver_b. You add them into Enterprise Manager with:
$OH/bin/addNewServerTarget.sh repserver_a (on ServerA and with repserver_b on ServerB). You might need to reload opmnctl and emctl with:
opmnctl reload
emctl reloadIn $OH/reports/conf you add this line at the end (use server=repserver_b on ServerB) :
reporting: userid=scott/tiger@orcl destype=cache desformat=htmlcss server=repserver_a %* You'll call your Reports with this URL:
http://reports.oracle.com:7777/reports/rwservlet?reporting&report=test.rdf
Good luck!
Martin

Load balancing OHS-OC4J

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