Application coding and clustering

We are going to develop a web system using iPlanet as web server running http and jsp, weblogic as application server running Java bean RMI inbetween. We have to decide whether to run the app server tire in one box or two(clustered). The idea of having two boxes is because of load balancing andscalability. According to our vendor, application coding (java bean) has to becluster-aware and so there is a price difference. Since we do not havepractical experience on this platform, can somebody please tell me what isthe difference in application coding? How much difference in terms of development efforts? If there is relevant info readilyavailable in the web, please point me the direction.
          

You are right. But one major problem that web application facing is
          scaleability. such application may have 100 hits in day 1 and 100K hits
          after a week. Using cluster will allow us simply to buy more box and join
          the cluste, and then it will share the load.
          "Mike Reiche" <[email protected]> wrote in message
          news:[email protected]...
          >
          > Less tiers -> less overhead -> less headaches -> less maintenance.
          >
          > If your application can run in a single tier on a single box (even a very
          big
          > box) - then that will be the simplest, most efficient architecture. As
          soon as
          > you run two WL instances vs. two - you've just doubled all your overhead -
          maybe
          > worse, maybe much worse.
          >
          > Mike
          >
          >
          > sender jones <[email protected]> wrote:
          > >We are going to develop a web system using iPlanet as web server running
          > >http and jsp, weblogic as application server running Java bean RMI
          > >inbetween. We have to decide whether to run the app server tire in one
          > >box or two(clustered). The idea of having two boxes is because of load
          > >balancing andscalability. According to our vendor, application coding
          > >(java bean) has to becluster-aware and so there is a price difference.
          > >Since we do not havepractical experience on this platform, can somebody
          > >please
          > >tell me what isthe difference in application coding? How much difference
          > >in terms of development efforts? If there is relevant info
          readilyavailable
          > >in the web, please point me the direction.
          >
          

Similar Messages

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    David Vazquez <[email protected]> wrote:
              > I understand that weblogic 6.1 replicates session data to a secondary server in a
              > cluster. This replication should include objects declared with <jsp:useBean ...
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              > with setAttribute().
              > However, what about objects with application scope? Are they replicated to a secondary
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              > Thanks,
              > -Dave.
              Dimitri
              

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    Use multiple instances of your application with different URIs (assuming the instances will not have to talk to each other), then, when configuring the service on each cluster, simply reference the specific URI of the application instance for that cluster. eg: Using Tomcat to host the PhoneMessenger application for Cluster1 and Cluster2, Deploy the same application twice: PhoneMessengerForCluster1 and PhoneMessengerForCluster2. The service URL on Cluster1 might be: http://app_server/PhoneMessengerForCluster1/servlet/PhoneMessenger , and for Cluster2 it could be http://app_server/PhoneMessengerForCluster2/servlet/PhoneMessenger

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              Let's say that we have two WebServers (NES) with the weblogic plugin (say WS1 and WS2) and a cluster with two WebLogicCommerce AppServers (say AS1 and AS2). Let's assume that each WebServer and AppServer runs on its own machine (total: 4 machines). Now, let's assume that the WebServer "obj.conf" files (on both WS1 and WS2) are setup so that they point to the servers in the cluster (WebLogicCluster="AS1:7601,AS2:7601").
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              Question 2: For failover, does the cluster automatically replicate the session state existing in AS1 onto AS2 before sending the response (does AS2 automatically become the secondary)?
              Now let's assume that AS1 crashes/dies. When the next request from the client comes to WS1 or WS2, they will forward it to AS1 (assuming that WS2 knows about the client session in AS1) . Since AS1 has crashed, will the client eventually get a timeout error message?
              Question 3: To ensure that the session failover happens so that AS2 gets the request instead (becomes the primary), do we need to setup a WebLogic Proxy Server? If so, why can't the plugins for NES provide the failover themselves?
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              Giri
              

              Thank you very much for your responses. It has been very helpful and I am clear on the session/clustering stuff. I have new questions on EJB and clustering which I will post as a separate thread.
              Giri
              "Jason Rosenberg" <[email protected]> wrote:
              >And also, if the browser has cookies disabled, it is important for
              >the app server to embed the WebLogicSession info via url rewriting,
              >otherwise the proxy or NES will not be able to route the session
              >properly.
              >
              >So, in all http responses, be sure to pass the url string through
              >response.encodeURL(). This will do the right thing depending
              >on whether cookies are enabled or not.
              >
              >I've just only recently figured this out. Haven't actually tried it
              >all out yet, so forgive me if it is not quite this simple, but this
              >seems to be the gist of it...
              >
              >Jason
              >
              >
              >"Justin James" <[email protected]> wrote in message news:[email protected]...
              >>
              >> Giri,
              >>
              >> I'm not a weblogic representative, but I tried to replicate this proxing service inside a load balancing switch(BigIP) and I
              >discovered a few things. The weblogic server sets a cookie (WebLogicSession)that the webserver plugin uses to manage the proxying.
              >The cookie (found in the HTTP header information) contains encoded information about the primary and secondary application servers
              >that the session is bound too. Any web server can read the cookie to determine how to dispatch the request to the primary server.
              >If the primary server does not respond, the request is forwarded to the secondary server by the plugin. Regardless of cluster size,
              >the session is replicated to only one other server.
              >>
              >> <[email protected]> wrote:
              >> >Giri Alwar wrote:
              >> >
              >> >> I need a couple of clarifications. First with regard to Question 1, I understand that plugins provide load balancing and
              >failover but what I really was asking is how the plugin in WS2 knows that a session for the client has been initiated in AS1 as a
              >result of WS1 sending the initial request to AS1. If WS2 gets a future request from the client, it needs to know this to send the
              >request to AS1. Does the plugin talk to the cluster to find out if there is a primary and who it is?
              >> >>
              >> >
              >> >> I should have clarified that my other questions pertain to in-memory replication. If I do not persist the session in a database
              >then does the client get an error message (timeout) when AS1 goes down (assuming we use NES with the WebLogic plugin)?
              >> >
              >> >Plugins' know how to route requests based on cookies. If it can't reach the primary server it will automatically try secondary.
              >In your case it doesn't matter if it reaches to proxy 1 or proxy 2, it is still the same.
              >> >
              >> >- Prasad
              >> >
              >> >> To prevent this error message and achieve failover, do I need to use WebLogic as the proxy server? If so, why isn't the NES
              >plugin doing this?
              >> >
              >> >> Thanks.
              >> >> Giri
              >> >>
              >> >> Prasad Peddada <[email protected]> wrote:
              >> >> >Giri Alwar wrote:
              >> >> >
              >> >> >> Let's say that we have two WebServers (NES) with the weblogic plugin (say WS1 and WS2) and a cluster with two
              >WebLogicCommerce AppServers (say AS1 and AS2). Let's assume that each WebServer and AppServer runs on its own machine (total: 4
              >machines). Now, let's assume that the WebServer "obj.conf" files (on both WS1 and WS2) are setup so that they point to the servers
              >in the cluster (WebLogicCluster="AS1:7601,AS2:7601").
              >> >> >>
              >> >> >> When a new request comes in to one of the WebServers (say WS1), the plugin will route it to one of the AppServers using
              >Round-Robin (say AS1). A session will now be initiated in AS1 and it sends a response back to the client.
              >> >> >>
              >> >> >> Question 1: How does the other proxy in WS2 know that all future requests for this client need to be forwarded to AS1?
              >> >> >
              >> >> > Plugin takes care of load balancing and failover, it is all transparent to the client.
              >> >> >
              >> >> >
              >> >> >> Question 2: For failover, does the cluster automatically replicate the session state existing in AS1 onto AS2 before sending
              >the response (does AS2 automatically become the secondary)?
              >> >> >
              >> >> > If you have only two yes it is automatically your secondary. Yes, replication is synchronous.
              >> >> >
              >> >> >>
              >> >> >> Now let's assume that AS1 crashes/dies. When the next request from the client comes to WS1 or WS2, they will forward it to
              >AS1 (assuming that WS2 knows about the client session in AS1) . Since AS1 has crashed, will the client eventually get a timeout
              >error message?
              >> >> >
              >> >> > If you are using some kind of persistence then you will be able to retrieve the session information and since the server
              >is not available the request will automatically failover.
              >> >> >
              >> >> >> Question 3: To ensure that the session failover happens so that AS2 gets the request instead (becomes the primary), do we
              >need to setup a WebLogic Proxy Server? If so, why can't the plugins for NES provide the failover themselves?
              >> >> >
              >> >> > No, you need only one. Either NES or weblogic proxy.
              >> >> >
              >> >> >
              >> >> >> Thank you very much for your help!
              >> >> >> Giri
              >> >> >
              >> >> >- Prasad
              >> >> >
              >> >
              >>
              >
              >
              

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    Hi All,
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    Steve Kim
    [email protected]
    SolarMetric Inc.
    http://www.solarmetric.com

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