RMI Clustering/Load Balancing

I want to be able to access a stateless application deployed in an IAS 10g cluster, with a remote client using RMI and have the RMI requests load balanced and failed over between the cluster. The application doesn't use EJBs.
Can anybody tell me how the client RMI requests could be load balanced and failed over accross the cluster?

This is the document you want :- http://download.oracle.com/docs/cd/E12825_01/epm.111/epm_high_avail/launch.html
or pdf version - http://download.oracle.com/docs/cd/E12825_01/epm.111/epm_high_avail.pdf
Cheers
John
http://john-goodwin.blogspot.com/

Similar Messages

Hardware clustering/load balancing/failover with Tomcat

Hello forum!
I recently bought a Cisco 1801, and it sure is capable! Anyhow, I've got a hobby website that is getting a fair bit of traffic - approaching too much for one node to handle and it's time to start thinking about distributing the load.
I'd like to do a little clustering of server nodes running Apache Geronimo, which is J2EE running atop Apache Tomcat. For the sake of keeping things generic, let's just call it Tomcat because it configures the same way.
I do not run Apache HTTP Server as a proxy, I only run Tomcat directly connected to the internet. I do this for performance reasons.
Anyhow, I'm wondering if any of you evil geniuses could suggest a way that I could cluster Tomcat nodes directly using the router to serve as a hardware load balancer and have the whole sticky session thing with failover, etc... All of the documents I find on the subject discuss clustering by way of Apache HTTP with Mod_JK.
I have already asked this question on the hardware side, and got great information about the capable load balancing features my router sports (but limited compared to Cisco CSS products.)
Now I'm wondering if anyone has experience taking an open source application server like Geronimo or Tomcat or JBoss and clustering it using hardware load balancing. What kinds of Tomcat configurations, if any, do I need to add for things like sticky sessions and failover? Or, is all that automatic?
Thanks so much for reading and for any replies. If there is a better forum for my question, please direct me there.
Cheers,
Dave Woldrich
http://CardMeeting.com

This occurs rarely when the Tomcat process is not able to connect to the database. The database connection problem is an internal cause which manifests externally as missing fields in reports.
Workaround: Restart the Apache process and the Tomcat process. From the CLI on your CiscoWorks Server, enter the following commands in the specified sequence:
1. pdterm Apache
2. pdterm Tomcat
3. pdexec Tomcat
4. pdexec Apache

Query on Clustering,Load Balancing and Dehydration in Oracle BPEL PM

Hi,
I had a Few queries on Dehydration ,Clustering and Load Balancing:
1) In section 5.1 "Use Case for Asynchronous Web Services",insertion of a dehydration point is mentioned.What do you exactly mean by this.Can a dehydration point be inserted explicitly?OR we have to put a wait activity or something so that dehydration happens?
2) If a dehydration point needs to be inserted explicity arent we assuming that the invoke-reply will take long?But this might not be the case always.Is is a lso possible that an asynchronous process is not a long running one.
3) Can we configure administratively ,how much time the process (say 10 seconds or so)waits after which it gets dehydrated?
4) Consider a load balancing scenario,where we have 2 BPEL PM's (PM1 and PM2) running on 2 different App Servers (SRV1 and SRV2)in an clustered environment.
Scenario:
1)We have an asynchronous process which makes a call to a human task activity.
2)A request from client comes for this process.
3) The load balancing server forwards it to PM1 on SRV1.PM1 processes the request and calls the human task.
4) PM1 has not dehydrated the process.
5) The response from the Human User comes back to the Load Balancer before the process is dehydrated by PM1.It forwards this response to PM2.PM2 searches for the Process based on the Cor-relation ID and does not find it.
Can you tell me how this scenario is handled?
I would be grateful if someone can answer these queries or direct me to some place where it is already explained.
Thanks
Dileep

1) In section 5.1 "Use Case for Asynchronous Web Services",insertion of a dehydration point is mentioned.What do you exactly mean by this.Can a dehydration point be inserted explicitly?OR we have to put a wait activity or something so that dehydration happens?
Insert a java snippet with "checkpoint();"
3) Can we configure administratively ,how much time the process (say 10 seconds or so)waits after which it gets dehydrated?
No, this is due to the performance of your database.

OSB jms clustering - load balancing seems to be not working

Hi All,
I have one admin server and two managed servers running ( one of these managed server is running in the remote linux machine) in a cluster
I have connectionfactory created with load balance enabled with round robin
and server affinity is disabled
I have queue created as uniformly distributed Q
I have a proxy service with load balancing as roundrobin and endpoint URL as below
jms://rdoelapp001011:61703,rdoelapp001013:61703/synergyConnectionFactory1/MM_gridQ0
If I execute this proxy sending messages it always go to one server only. There is no message going to the other server.
If I shutdown the server that receives messages then the other server is receiving messages. Seems like fail-over is working but not the load-balancing
There is one point may be worth mentioning here is, from the admin console if I look at the servers for the clusters it has below information
Name      State      Drop-out Frequency      Remote Groups Discovered      Local Group Leader      Total Groups      Discovered Group Leaders      Groups      Primary
synergyOSBServer1     RUNNING     Never     0     synergyOSBServer1     1     synergyOSBServer1     *{synergyOSBServer1}*     0
synergyOSBServer2     RUNNING     Never     0     synergyOSBServer1     1     synergyOSBServer1     *{synergyOSBServer1, synergyOSBServer2}* 0
one server has groups as {synergYOSBServer1} instead of {synergyOSBServer1, synergyOSBServer2}. Does that look correct?
here is my jms xml file
<?xml version='1.0' encoding='UTF-8'?>
<weblogic-jms xmlns="http://xmlns.oracle.com/weblogic/weblogic-jms" xmlns:sec="http://xmlns.oracle.com/weblogic/security" xmlns:wls="http://xmlns.oracle.com/weblogic/security/wls" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.oracle.com/weblogic/weblogic-jms http://xmlns.oracle.com/weblogic/weblogic-jms/1.1/weblogic-jms.xsd">
*<connection-factory name="synergyConnectionFactory1">*
*<sub-deployment-name>synergySubDeploy1</sub-deployment-name>*
*<default-targeting-enabled>false</default-targeting-enabled>*
*<jndi-name>synergyConnectionFactory1</jndi-name>*
*<client-params>*
*<client-id-policy>Restricted</client-id-policy>*
*<subscription-sharing-policy>Exclusive</subscription-sharing-policy>*
*<messages-maximum>10</messages-maximum>*
*</client-params>*
*<transaction-params>*
*<xa-connection-factory-enabled>false</xa-connection-factory-enabled>*
*</transaction-params>*
*<load-balancing-params>*
*<load-balancing-enabled>true</load-balancing-enabled>*
*<server-affinity-enabled>false</server-affinity-enabled>*
*</load-balancing-params>*
*<security-params>*
*<attach-jmsx-user-id>false</attach-jmsx-user-id>*
*</security-params>*
*</connection-factory>*
<uniform-distributed-queue name="errorQ">
<sub-deployment-name>synergySubDeploy1</sub-deployment-name>
<default-targeting-enabled>false</default-targeting-enabled>
<jndi-name>errorQ</jndi-name>
<load-balancing-policy>Round-Robin</load-balancing-policy>
<forward-delay>-1</forward-delay>
<reset-delivery-count-on-forward>true</reset-delivery-count-on-forward>
</uniform-distributed-queue>
<uniform-distributed-queue name="undlvQ">
<sub-deployment-name>synergySubDeploy1</sub-deployment-name>
<default-targeting-enabled>false</default-targeting-enabled>
<jndi-name>undlvQ</jndi-name>
<load-balancing-policy>Round-Robin</load-balancing-policy>
<forward-delay>-1</forward-delay>
<reset-delivery-count-on-forward>true</reset-delivery-count-on-forward>
</uniform-distributed-queue>
*<uniform-distributed-queue name="MM_gridQ0">*
*<sub-deployment-name>synergySubDeploy1</sub-deployment-name>*
*<default-targeting-enabled>false</default-targeting-enabled>*
*<jndi-name>MM_gridQ0</jndi-name>*
*<load-balancing-policy>Round-Robin</load-balancing-policy>*
*<forward-delay>5</forward-delay>*
*<reset-delivery-count-on-forward>true</reset-delivery-count-on-forward>*
*</uniform-distributed-queue>*
<saf-imported-destinations name="synergySAFImportedDest1">
<sub-deployment-name>synergySubDeploy1</sub-deployment-name>
<default-targeting-enabled>false</default-targeting-enabled>
<saf-queue name="gridQ0">
<remote-jndi-name>MB_gridQ0</remote-jndi-name>
<local-jndi-name>gridQ0</local-jndi-name>
<non-persistent-qos>At-Least-Once</non-persistent-qos>
<time-to-live-default>0</time-to-live-default>
<use-saf-time-to-live-default>false</use-saf-time-to-live-default>
<unit-of-order-routing>Hash</unit-of-order-routing>
</saf-queue>
<jndi-prefix>MB_</jndi-prefix>
<saf-remote-context>synergySAFContext1</saf-remote-context>
<saf-error-handling>synergySAFErrorHndlr1</saf-error-handling>
<time-to-live-default>0</time-to-live-default>
<use-saf-time-to-live-default>false</use-saf-time-to-live-default>
<unit-of-order-routing>Hash</unit-of-order-routing>
</saf-imported-destinations>
<saf-remote-context name="synergySAFContext1">
<saf-login-context>
<loginURL>t3://rdoelapp001013:7001</loginURL>
<username>weblogic</username>
<password-encrypted>{AES}z9VY/K4M7ItAr2Vedvhx+j9htR/HkbY2LRh1ED+Cz5Y=</password-encrypted>
</saf-login-context>
<compression-threshold>2147483647</compression-threshold>
</saf-remote-context>
<saf-error-handling name="synergySAFErrorHndlr1">
<policy>Log</policy>
<log-format xsi:nil="true"></log-format>
<saf-error-destination xsi:nil="true"></saf-error-destination>
</saf-error-handling>
</weblogic-jms>
Any help will be greatly appriciated
Edited by: 818591 on Feb 16, 2011 11:28 AM

I am not getting you here "the right approach is to make OSB run on the man server cluster and not on admin server. "
I have a jms proxy service that I created from admin console
And also I have gone thru the step 5 in the link below
http://download.oracle.com/docs/cd/E13159_01/osb/docs10gr3/deploy/config.html#wp1524235
If I am not wrong, the proxy service endpoint URI determines where it is pointing to. If it is a cluster environment, it should point to a clustered address
My proxy has below endpoint URI
jms://rdoelapp001011:61703,rdoelapp001013:61703/synergyConnectionFactory1/MM_gridQ0
and rdoelapp001011:61703,rdoelapp001013:61703 is my cluster address
As per your suggestion "To fix your problem, *make osb to run on the cluster* and specify the same URL for the jms proxy service"
Could you please provide some instruction how would I "make osb jms proxy service to run in a cluster"
As a note, I have Q defined as a distributed Q and connection factory targets to the cluster. UDQ also targtes to the cluster.
Just for a testing I have created another manged server running local to the machine where my admin server is running
And I created a proxy by following steps as I mentioned above and with endpoint URI as below
jms://rdoelapp001011:61703,rdoelapp001013:61703,*rdoelapp001011:61700*/synergyConnectionFactory1/MM_gridQ0
where the new address of my cluster is rdoelapp001011:61703,rdoelapp001013:61703,rdoelapp001011:61700
It did create consumers in both the managed servers in the cluster that are running locally, but no consumers in the remote managed server.
So I am kind of leaning towards thinking that there is some incorrect setup for the remote managed server and may be admin server is not able to communicate to the remote server for some reason but not sure about it..
As a note the cluster is setup to communicate using "unicast" channel
and I created a channel in each manged server with the same name
here is the cluster configuration
<name>synergyCluster1</name>
<cluster-address>rdoelapp001011:61703,rdoelapp001013:61703,rdoelapp001011:61700</cluster-address>
<default-load-algorithm>round-robin</default-load-algorithm>
*<cluster-messaging-mode>unicast</cluster-messaging-mode>*
*<cluster-broadcast-channel>synergyChannel1</cluster-broadcast-channel>*
*<number-of-servers-in-cluster-address>3</number-of-servers-in-cluster-address>*
</cluster>
here are the twoOSBserver configuration
<server>
<name>synergyOSBServer1</name>
<machine xsi:nil="true"></machine>
<listen-port>61703</listen-port>
<cluster>synergyCluster1</cluster>
<web-server>
<web-server-log>
<number-of-files-limited>false</number-of-files-limited>
</web-server-log>
</web-server>
<server-debug>
<debug-scope>
<name>weblogic.jms.saf</name>
<enabled>true</enabled>
</debug-scope>
<debug-jmssaf>true</debug-jmssaf>
<debug-saf-sending-agent>true</debug-saf-sending-agent>
</server-debug>
<listen-address>localhost</listen-address>
<network-access-point>
*<name>synergyChannel1</name>*
*<protocol>cluster-broadcast</protocol>*
*<listen-address>localhost</listen-address>*
*<listen-port>61702</listen-port>*
<http-enabled-for-this-protocol>true</http-enabled-for-this-protocol>
<tunneling-enabled>false</tunneling-enabled>
*<outbound-enabled>true</outbound-enabled>*
*<enabled>true</enabled>*
<two-way-ssl-enabled>false</two-way-ssl-enabled>
<client-certificate-enforced>false</client-certificate-enforced>
</network-access-point>
<jta-migratable-target>
<user-preferred-server>synergyOSBServer1</user-preferred-server>
<cluster>synergyCluster1</cluster>
</jta-migratable-target>
</server>
<server>
<name>synergyOSBServer2</name>
<ssl>
<enabled>false</enabled>
</ssl>
<machine xsi:nil="true"></machine>
<listen-port>61703</listen-port>
<listen-port-enabled>true</listen-port-enabled>
<cluster>synergyCluster1</cluster>
<web-server>
<web-server-log>
<number-of-files-limited>false</number-of-files-limited>
</web-server-log>
</web-server>
<listen-address>rdoelapp001013</listen-address>
<network-access-point>
*<name>synergyChannel1</name>*
*<protocol>cluster-broadcast</protocol>*
*<listen-address>rdoelapp001013</listen-address>*
*<listen-port>61702</listen-port>*
<http-enabled-for-this-protocol>true</http-enabled-for-this-protocol>
<tunneling-enabled>false</tunneling-enabled>
*<outbound-enabled>true</outbound-enabled>*
*<enabled>true</enabled>*
<two-way-ssl-enabled>false</two-way-ssl-enabled>
<client-certificate-enforced>false</client-certificate-enforced>
</network-access-point>
<java-compiler>javac</java-compiler>
<jta-migratable-target>
<user-preferred-server>synergyOSBServer2</user-preferred-server>
<cluster>synergyCluster1</cluster>
</jta-migratable-target>
<client-cert-proxy-enabled>false</client-cert-proxy-enabled>
</server>
<server>
Edited by: 818591 on Feb 18, 2011 11:26 AM

RMI-P4 Load Balance

Dear all,
We've a landscape as follow:
Primary Application Sever (NetWeaver CE 7.2)
Additional Application Server 1 (NetWeaver CE 7.2), it has 3 nodes
Additional Application Server 2 (NetWeaver CE 7.2), it has 3 nodes
Our client application use ms://<host>:<ms_port>/P4 to get reference to EJB remote interface, it works fine, so we've EJBs from all servers being used to handle our requests.
I would like to define that Primary Application Server must to handle few or no request, just redirect to Additional Application Server, is possible to configure it? Or define a limit to handle requests on Primary Application Server?
How PAS has Database, Web Dynpro Applications and so, I would like to reduce the EJB processing on it and give priority for EJB processing on AAS's, because today I've have a lot of EJB processing on PAS and some nodes of AAS's has not been called.
Best regards

Well as i said i never used the RMI-P4 protocol myself, only http and gui load balancing. It seems logon groups are not mentioned in the documentation for RMI-P4. Usually this is the way to go, to get the msg server to drive request to a certain group of instances.
The message server either keeps a list with response times of the instances and directs requests to the one with the best times. Or for http it distributes more requests to instances with more capacity.
The problem (well it is not necessarly a problem) with your kind of installation, that the response times are usually better on the primary applications server, unless it becomes heavily loaded. That seems to be why most requests go to the primary application server on your system.
Cheers Michael

XIR3 Clustered load balancing - how is it handled?

Can anyone help me with this, or point to some useful documentation on the following? The scenario is this. I plan to deploy the following 2 servers:
1. Server 1, with it's CMS and system database
2. Server 2, clustered with Server 1 (different machine), using the same system database and FRS (on a NAS).
Questions
1. How is the load balancing handled. Is there an SIA for each server, or one SIA handling each server and respective CMS? By what process/servers is the load balancing handled?

That's strange. The client side of DeskI doesn't store what connections are being used or how many, so how could it evaluate which server to use before connecting? Surely if I am asking it to connect to Server B and it finds Server B then it would use Server B? If it couldn't find Server B then I can understand how it would redirect to Server A.
In my case the CMS for Server B is up and running, my registry settings are configure to search for A and B, so in the case of Server B being unused and the CMS up and running the DeskI client that is looking for Server B sould find Server B and not Server A, right?
Is there any documentation on this?

Multiple dgraph clustering (load balancing) OOTB available?

Hello,
We have 2 dgraphs running in parallel having the same data to share the load of the clients.
I would like to know if there is any OOTB solution provided by Endeca where in these two dgraphs can share the load. OR I need to use an external load balancer for the same?
If there is any document that explains the configuration for OOTB Endeca solution, please let me know
Thanks!

Hi,
yes I know...
i tried to check if they were still available...but found none,
that's why I said if you want me to send them email me ...(I downloaded them from Eden ) and the files aren't too big
regards
Saleh
29/11/12 : copy of the document called Simple MDEX Load Balancing with Apache HTTP Server (Endeca)
Endeca Solution Article Simple MDEX Load Balancing with Apache HTTP Server
Endeca Solution Article
Simple MDEX Load Balancing with Apache HTTP Server
By Robert Dennis
Last Updated: December 2010
Endeca Product Versions: 5.0+
This document describes how to set up a simple load balancing and failover solution using Apache HTTP server. This provides a cost effective mechanism leveraging widely available open source technologies to address simple infrastructure needs. This document includes the following sections:
 Introduction
 Configuration Steps
 References
Endeca Solution Article Simple MDEX Load Balancing with Apache HTTP Server
Endeca Confidential 2 of 5
Introduction
Load balancers are the preferred solution for providing scalability, redundancy, and fail-over for MDEX Engine queries. Typically, load balancing and failover are accomplished with the use of dedicated load balancing hardware. For some Endeca implementations, however, a robust mechanism for load balancing may not be available or required by the customer. For more information on the basics of load balancing an Endeca application, see the “Endeca Load Balancing Best Practices” Solution Article available on EDeN.
This document describes the configuration steps involved in leveraging Apache’s default load balancing mechanisms to provide a simple load balancing solution for an Endeca application. In this scenario, Apache will sit between the Endeca presentation API housed in a web application and redundant MDEX engines. Apache performs the duties of a simple load balancer and failover broker, managing query requests from the application tier to specific MDEX engines.
Configuration Steps
The described configuration leverages Apache 2.2 HTTP Server as the load balancing mechanism between two identical MDEX engines all residing on a single server. The sample configuration expects the Apache HTTP server to be listening on port 5555 and the MDEX engines to be listening on ports 8000 and 8001. These can be changed as appropriate for a given environment.
1. In the Apache httpd.conf, enable the server for listening on port 5555.
Endeca Solution Article Simple MDEX Load Balancing with Apache HTTP Server
Endeca Confidential 3 of 5
2. Enable the following modules by un-commenting the appropriate loadmodule statements in the httpd.conf file. These modules include: mod_proxy, mod_proxy_balancer, mod_proxy_connect, mod_proxy_http, mod_negotiation.
3. Include the httpd-vhosts.conf file by un-commenting the appropriate line in the httpd.conf file.
4. Save the httpd.conf file and open the httpd-vhosts.conf file. Append the below information and save the file.
Endeca Solution Article Simple MDEX Load Balancing with Apache HTTP Server
Endeca Confidential 4 of 5
NameVirtualHost *:5555 <VirtualHost *:5555> ServerName localhost ProxyPass / balancer://dgraphs/ ProxyPassReverse / balancer://dgraphs/ <Proxy balancer://dgraphs> BalancerMember http://localhost:8000 loadfactor=1 retry=0 BalancerMember http://localhost:8001 loadfactor=1 retry=0 </Proxy> </VirtualHost> <Location /balancer-manager> SetHandler balancer-manager </Location>
The “retry” parameter associated with Balance Members disables the period of inactivity for a particular worker after Apache determines it is offline. The default is 60 seconds. It is recommended that this is set to a low number such as 0.
In environments where particular MDEX engines are targeted for additional load, the “loadfactor” parameter associated with Balance Members can be adjusted. Higher values ensure that the load balancing algorithm that is used will route the traffic load accordingly to specific Balance Members.
5. Restart Apache.
6. Within the UI application, configure the host and port of the HttpENEConnection to the host and port of the load balancer (e.g. localhost:5555).
Endeca Solution Article Simple MDEX Load Balancing with Apache HTTP Server
Endeca Confidential 5 of 5
Apache HTTP Server is now properly configured to serve as a load balancer for the MDEX Engines.
References
“Endeca Load Balancing Best Practices” Solution Article (EDeN)
Apache Module mod_proxy
Apache Module mod_proxy_balancer
Apache Module mod_proxy_connect
Apache Module mod_proxy_http
Apache Module mod_negotiation
Edited by: sabdelhalim on Nov 28, 2012 5:46 PM

JMS Clustering : Load Balancing expected Behaviour

Hi All,
          I have a Cluster with a 2 managed servers A and B . ConnectionFactory is deployed to the cluster and Server B hosts JMS Server.Destinations on the JMS Server are not distributed, but the JNDI Names of the same are replicated across the cluster.Both Load Balancing and server affinity are enabled on the connectionFactory(I hope these attributes are required only if the destinations are distributed).
          An application containing MDBs and EJBs are deployed to the cluster and onMessage MDB looks up for a Facade and makes calls on it.An external java client sets up the initialContext based on the cluster address and starts sending messages to the destination
          What should be the expected behaviour in this scenario ?According to my understanding,
          -Eventhough, the connectionFactory is deployed across the cluster, since the physical destinations are available only in the weblogic server hosting the JMS Server(Server B), the actual message handling(MDB invocation) would be done only here.
          -When the MDBs are invoked on serverB, it would performs a lookup for the Facade.Because of the colocation optimisation, the replica aware stub used would be the one in ServerB and henceforth all the method processing should be done on Server B.
          Is this correct ? But this would also mean that no load balancing would happen because of the colocation optimisation ? Do i need to use a distributed destination to enable load balancing in this scenario ?
          Any help would be greatly appreciated..
          thanks,
          Josh

Hi All,
          I have a Cluster with a 2 managed servers A and B . ConnectionFactory is deployed to the cluster and Server B hosts JMS Server.Destinations on the JMS Server are not distributed, but the JNDI Names of the same are replicated across the cluster.Both Load Balancing and server affinity are enabled on the connectionFactory(I hope these attributes are required only if the destinations are distributed).
          An application containing MDBs and EJBs are deployed to the cluster and onMessage MDB looks up for a Facade and makes calls on it.An external java client sets up the initialContext based on the cluster address and starts sending messages to the destination
          What should be the expected behaviour in this scenario ?According to my understanding,
          -Eventhough, the connectionFactory is deployed across the cluster, since the physical destinations are available only in the weblogic server hosting the JMS Server(Server B), the actual message handling(MDB invocation) would be done only here.
          -When the MDBs are invoked on serverB, it would performs a lookup for the Facade.Because of the colocation optimisation, the replica aware stub used would be the one in ServerB and henceforth all the method processing should be done on Server B.
          Is this correct ? But this would also mean that no load balancing would happen because of the colocation optimisation ? Do i need to use a distributed destination to enable load balancing in this scenario ?
          Any help would be greatly appreciated..
          thanks,
          Josh

Clustering load balancing

How do you set up clutering/load balancing?
I know it's with APS but can't find the documentation for 11.1.1
Thank you,
Jz

This is the document you want :- http://download.oracle.com/docs/cd/E12825_01/epm.111/epm_high_avail/launch.html
or pdf version - http://download.oracle.com/docs/cd/E12825_01/epm.111/epm_high_avail.pdf
Cheers
John
http://john-goodwin.blogspot.com/

Help: newbie of iplanet clustering & loading balancing

As l went through the sample app, "bank" coming along with iplanet. l have a few questions in mind. It is highly appreciated somebody can give a helping hand to me by answering below questions
1) In ias-web.xml and web.xml, the app is set as "distributable" and session is synchronized by "dsync". Also, all servlets are set "sticky". My question is why the JSP don't need to be set as "sticky". If l have a web site made up of serveral ten of thousand of JSP pages, it will be a big trouble
2) Let's say, if the sample include a stateful session bean, do l have to set that stateful session bean to "sticky". If so,
does it mean the invocation from servlet to stateful session bean will take place in same JVM process.
3) Is there any latency if session is synchronized by "dsync" process. If the application is set as "distributable" (support load-balancing), but the servlet is NOT set as sticky. Will it cause any trouble due to latency of synchronization of session among iplanet server
regards
Danny

Hi
Firstly, Thanks for your reply. it would very thankful if you can provide me more detailed information on below questions
1) As a stateful session bean is set sticky. Does it mean all requests from same session will be directed from web-tier to the same jvm initializing that stateful session bean. Also, all invocation to entity bean/other sesson beans from that sticky stateful session bean will take place within same jvm as this stateful session bean is, am l correct ?
2) Is there a latency for "dsync" to do replication of state of HTTPsession and stateful session bean ? If so, there is chance that state of HTTPSession / stateful session bean will be lost if the crash of jvm happen in-between the replication, am l correct ? Is there any way to avoid it ?
regards
Danny

Setting up Load Balancing / Clustering in BIP installation

Hi,
We're upgrading Siebel 7.8 to 8.1.1.5. As part of this process, we'll be replacing the two clustered Actuate Servers with two BI Publisher installations.
We need BIP to behave like for like compared to Actuate (clustered / load balanced) but I cannot any detailed instructions on implementing Load Balancing / Clustering of BIP anywhere.
We use a Loadbalancer.org appliance to balance the Siebel URL - my plan is to use this to support load balancing of the Web Services across the two BIP instances. However, I also need the two BIP installations to share the same repository.
I've come across an Oracle White Paper (http://www.oracle.com/technetwork/middleware/bi-publisher/bip-cluster-deployment-366859.pdf) that states:
The repository is shared among different servers in the cluster
However, looking at the installation guide for Oracle BIP 10.1.x.x.x, there are no details on how to achieve this.
Anyone know where to find documentation explaining, in detail, how to load balance multiple BIP servers to achieve the same level of high availability as we had with Actuate?
Thanks in advance!
mroshaw

http://e-docs.bea.com/wls/docs60/////adminguide/apache.html
          "Kit Chan" <[email protected]> wrote in message news:[email protected]..
          > After I have gone through the documentation of Administering the server and
          > Clustering, I still do not know where should I start with and what settings
          > I need to add. Is there any detailed document concerning setting up a
          > cluster with Apache plug-in and two WL6.0 servers?
          >
          > Can anyone please help?
          >
          > Thanks a lot.
          >
          > Kit Chan
          > [email protected]
          >
          >
          >

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 Reports Services 10g with WebCache?

Hi Guys
Does anybody have any good ideas on how to load balance Oracle Reports Services?
Can I do it with WebCache as with Forms Services?
/Jacob :)

My java application resides in a different server (weblogic) from the Oracle Application server (which has the report server). I do a browser redirect from my java application to a URL of OAS . I have hard coded Oracle Application server and report server name in one of my config files in my java weblogic server
In the above URL, servername:7770 is the Oracle Application Server. I would not have a problem with this since this will be the name of the cluster.
But the problem is server=<report server> . The report server which will pickup my request will be identified only after the browser has redirected to the URL. SO I cannot hard code it in my ajava application.
Can I just remove server=<report server name> when generating URL from my java application when I need to run report server in a clustered load balancing environment?
Sorry if my earlier post was confusing

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 ?

Oracle Web Cache - Load Balancer Mode

Hello,
I am facing a problem related to fault tolerance in Oracle Web Cache
My environment:
2 Nodes of Oracle Application Server 10.1.3 configured in cluster.
have configured Oracle Web Cache (in LoadBalancer mode only) to simulate a BigIP load balancing above these two oc4j node. This to be used as fault tolerance so if one http request will fail the LoadBalancer will direct it to the second oc4j (its http server).
I have used the defaults recommended by Oracle documentation for configuration clustering load balancer using Oracle Web Cache and using JSESSIONID for Session binding with oc4j-type. I left all other cluster/server setting to default
Problem:
The problem is when I am shutting down one oc4j instance the Oracle Web Cache tries to keep the session with the un-available oc4j node and not direct the session to the other oc4j node.
If I choose to start a new session (loose current work) than it does work with the second (alive) oc4j node, but than where is its fault tolerance??
What do i need to do to keep working with the same session over the second oc4j node. My deployed Web App is enabled to work in cluster, using Oracle Application Server console. Here is its orion-application.xml
+<?xml version="1.0"?>+
+<orion-application xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://xmlns.oracle.com/oracleas/schema/orion-application-10_0.xsd" deployment-version="10.1.3.1.0" default-data-source="jdbc/OracleDS" component-classification="external"+
schema-major-version="10" schema-minor-version="0" >
+     <web-module id="session_rep" path="session_rep.war" />+
+     <persistence path="persistence" />+
+     <principals path="principals.xml" />+
+     <jazn provider="XML" />+
+     <log>+
+          <file path="application.log" />+
+     </log>+
+     <cluster allow-colocation="false">+
+     <replication-policy trigger="onRequestEnd" scope="modifiedAttributes"/>+
+     <flow-control-policy enabled="false" />+
+          <protocol>+
+               <peer>+
+                              <opmn-discovery/>+
+               </peer>+
+          </protocol>+
+     </cluster>+
+</orion-application>+
Will appreciate any help !

is OHS/apache deployed between web cache and your OC4J? if so, i think since OHS/apache is alive to web cache, web cache keeps routing to it.
maybe in your script, you can shutdown both OHS/apache and OC4J totgether so web cache can correctly route.

RMI Clustering/Load Balancing

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