Load balancing and session sharing

Hi,
in my company we have the following situation:
We have 2 instances of the same web application on differend servers.
An external load balancer (Alteon) routes the requests to these instances.
The problem:
If one instance is shutting down, all the sessions of this app are gone. These users has to login again.
The question:
Is it possible to avoid this?
Is is possible to keep these session, so the users don't have to login again?
Maybe with a kind of session sharing between these 2 instances?
using:
oc4j standalone - 10.1.3.1
OS: Windows
thank you
Marcus

The solution:
Multicast IP replication is the default replication protocol used in a standalone OC4J installation
see: http://download.oracle.com/docs/cd/B32110_01/web.1013/b28950/cluster.htm#BABBHGHJ
-> Configuring Multicast Replication

Similar Messages

  • Discussion on load-balance and load-sharing

    Hi, I found a article, which discuss the difference between load-balance and load-sharing. I think the explanation is pretty good, please see below. But I still have a question: how can we decide to choose one the both balance in the production environment ?  Thank you
    "In short, load balancing tries to distribute traffic evenly over multiple paths, whereas, load sharing intends to do it (for the lack of a better term) equally.  True load balancing is difficult to achieve.  For example, let's say there were two links (100 mbps and 300 mpbs) and a router needed to send out 600 mbps of traffic.  Load balancing would distribute the traffic evenly, sending 300 mbps on each link.  On the contrary, load sharing would divide the traffic equally based on the available resources, sending 200 mbps on the slower link and 400 mbps on the faster one. "

    Disclaimer
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    Posting
    That's not how Cisco uses the terms, and generically they are often used almost interchangeably.
    Cisco uses load balancing as the catch all for how a single L3 device routes across multiple paths to the same destination.  Equal metrics or equal actual load distribution are not required.  Most often, load balancing will be discussed with ECMP, but unequal path loading balancing will include Cisco's proprietary IGPs, such as EIGRP.
    Cisco uses load sharing when using multiple paths when a single L3 devices doesn't normally route across multiple paths or multiple L3 devices are involved.  Cisco load sharing discussions usually revolve around BGP.
    Generically, I would say load balancing has more of a dynamic aspect to it, i.e. something is trying to actively balance traffic across multiple paths, while load sharing might mean multiple paths are utilized but not actively dynamically balanced.
    I'm unsure what's your question with a production environment.

  • Network Load Balancing and failover for AFP Sharing

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  • Hardware load balancing with session stickiness

    Hello,
              We are looking for a hardware based solution to load balance 4
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              Thanks,
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              Having worked on Cisco load balancer and WLS clustered, you would loose sessions
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              S
              "Shawn Kircher" <[email protected]> wrote:
              >
              >Has anyone got this type of scenario working where you load balance sticky
              >sessions
              >from a Cisco load balancer between non-clustered weblogic servers?
              >
              >Thanks,
              >
              >Shawn
              >
              >"Aravind Krishnasamy" <[email protected]> wrote:
              >>F5 or BigIp provides hardware level load balancing and it injects date
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              >>Thanks
              >>Aravind
              >>"ageorge" <[email protected]> wrote in message
              >>news:[email protected]...
              >>> Hello,
              >>>
              >>> We are looking for a hardware based solution to load balance 4
              >>> unclustered weblogic servers. These servers are software replicas
              >>of
              >>> each other and share a common database. We need a solution that
              >>> provides session level server stickiness based on jsessionid as both
              >>a
              >>> cookie and url rewrite. Currently we have Cisco load balancers which
              >>> do not handle the url rewrite due to the fact the the load balancer
              >>> only "sees" what is after the question mark in the url and the
              >>> jsessionid is before the question mark. Example:
              >>>
              >>>
              >>http://somehost.com/some/url.jsp;jsessionid=26D5C566075663ABD8E17AD255974323
              >>?parm=value
              >>>
              >>> I'm sure we are not the only ones trying to do this. Any suggestions
              >>> would be greatly appreciated.
              >>>
              >>> Thanks,
              >>>
              >>> Alan George
              >>
              >>
              >
              

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    >
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                   daryReplicaHandler@acf6e)/398
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                   daryReplicaHandler@252fdf)/380
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                   daryReplicaHandler@6a0252)/381
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                   daryReplicaHandler@4695a6)/397
                   the_ejb2 = ClusterableRemoteRef(203.231.15.125 weblogic.rmi.cluster.PrimarySecon
                   daryReplicaHandler@6a0252)/381
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              I have three problem
              1. I have 2 clustered server. my weblogic-ejb-jar.xml is here
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              <!DOCTYPE weblogic-ejb-jar PUBLIC '-//BEA Systems, Inc.//DTD WebLogic 6.0.0 EJB//EN'
              'http://www.bea.com/servers/wls600/dtd/weblogic-ejb-jar.dtd'>
              <weblogic-ejb-jar>
              <weblogic-enterprise-bean>
                   <ejb-name>DBStatefulEJB</ejb-name>
                   <stateful-session-descriptor>
                   <stateful-session-cache>
                        <max-beans-in-cache>100</max-beans-in-cache>
                        <idle-timeout-seconds>120</idle-timeout-seconds>
                   </stateful-session-cache>
                   <stateful-session-clustering>
                        <home-is-clusterable>true</home-is-clusterable>
                        <home-load-algorithm>RoundRobin</home-load-algorithm>
                        <home-call-router-class-name>common.QARouter</home-call-router-class-name>
                        <replication-type>InMemory</replication-type>
                   </stateful-session-clustering>
                   </stateful-session-descriptor>
                   <jndi-name>com.daou.EJBS.solutions.DBStatefulBean</jndi-name>
              </weblogic-enterprise-bean>
              </weblogic-ejb-jar>
              when i use "<home-call-router-class-name>common.QARouter</home-call-router-class-name>"
              and deploy this ejb, exception cause
              <Warning> <Dispatcher> <RuntimeException thrown b
              y rmi server: 'weblogic.rmi.cluster.ReplicaAwareServerRef@9 - jvmid: '2903098842
              594628659S:203.231.15.167:[5001,5001,5002,5002,5001,5002,-1]:mydomain:cluster1',
              oid: '9', implementation: 'weblogic.jndi.internal.RootNamingNode@5f39bc''
              java.lang.IllegalArgumentException: Failed to instantiate weblogic.rmi.cluster.B
              asicReplicaHandler due to java.lang.reflect.InvocationTargetException
              at weblogic.rmi.cluster.ReplicaAwareInfo.instantiate(ReplicaAwareInfo.ja
              va:185)
              at weblogic.rmi.cluster.ReplicaAwareInfo.getReplicaHandler(ReplicaAwareI
              nfo.java:105)
              at weblogic.rmi.cluster.ReplicaAwareRemoteRef.initialize(ReplicaAwareRem
              oteRef.java:79)
              at weblogic.rmi.cluster.ClusterableRemoteRef.initialize(ClusterableRemot
              eRef.java:28)
              at weblogic.rmi.cluster.ClusterableRemoteObject.initializeRef(Clusterabl
              eRemoteObject.java:255)
              at weblogic.rmi.cluster.ClusterableRemoteObject.onBind(ClusterableRemote
              Object.java:149)
              at weblogic.jndi.internal.BasicNamingNode.rebindHere(BasicNamingNode.jav
              a:392)
              at weblogic.jndi.internal.ServerNamingNode.rebindHere(ServerNamingNode.j
              ava:142)
              at weblogic.jndi.internal.BasicNamingNode.rebind(BasicNamingNode.java:36
              2)
              at weblogic.jndi.internal.BasicNamingNode.rebind(BasicNamingNode.java:36
              9)
              at weblogic.jndi.internal.BasicNamingNode.rebind(BasicNamingNode.java:36
              9)
              at weblogic.jndi.internal.BasicNamingNode.rebind(BasicNamingNode.java:36
              9)
              at weblogic.jndi.internal.BasicNamingNode.rebind(BasicNamingNode.java:36
              9)
              at weblogic.jndi.internal.RootNamingNode_WLSkel.invoke(Unknown Source)
              at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:296)
              So do i must use it or not???
              2. When i don't use "<home-call-router-class-name>common.QARouter</home-call-router-class-name>"
              , there's no exception
              but load balancing does not happen. According to the document , there's must load
              balancing when i call home.create() method.
              my client program goes here
                   DBStateful the_ejb1 = (DBStateful) PortableRemoteObject.narrow(home.create(),
              DBStateful.class);
                   DBStateful the_ejb2 = (DBStateful) PortableRemoteObject.narrow(home.create(3),
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                   the_ejb1 = ClusterableRemoteRef(203.231.15.167 weblogic.rmi.cluster.PrimarySecon
                   daryReplicaHandler@4695a6)/397
                   the_ejb2 = ClusterableRemoteRef(203.231.15.167 weblogic.rmi.cluster.PrimarySecon
                   daryReplicaHandler@acf6e)/398
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                   the_ejb1 = ClusterableRemoteRef(203.231.15.125 weblogic.rmi.cluster.PrimarySecon
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              > ----------
              > C h r i s t o p h e r A . F r a s e r
              > Director, Technology
              > macroplay.com, Inc.
              > [email protected]
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              > > Chris Fraser wrote:
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              > > >
              > > > thanks,
              > > > cfraser
              

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