Singleton behaviour in clustered environment

Hi,
          I have a very basic question. In a WebLogic clustered
          environment, is a Singleton replicated? In other words, if the
          mySingleton on node A in a cluster is updated with a piece of data,
          will this show in the mySingleton in node B?
          Thanks
          Ciao
          Ferruccio
          

No. If you need this type of functionality, use Coherence.
          http://www.tangosol.com/coherence.jsp
          Peace,
          Cameron Purdy
          Tangosol, Inc.
          http://www.tangosol.com/coherence.jsp
          Tangosol Coherence: Clustered Replicated Cache for Weblogic
          "Ferruccio" <[email protected]> wrote in message
          news:[email protected]..
          > Hi,
          > I have a very basic question. In a WebLogic clustered
          > environment, is a Singleton replicated? In other words, if the
          > mySingleton on node A in a cluster is updated with a piece of data,
          > will this show in the mySingleton in node B?
          >
          > Thanks
          >
          > Ciao
          > Ferruccio
          

Similar Messages

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    Hi
    Could anyone suggest links or tutorials explaining the singleton property and its importance in clustered environment(both active-active and active-passive).
    Please anyone explain this .
    I've googled and couldn't understand the explanations which I've gone through.
    Appreciate your help.
    Regards,
    Dev...

    HI,
    click on ur node and on the singleton proprty click F1. u will get the full detail.
    The property "Singleton" specifies the number of instances that can exist in a dependent context node (that does not belong directly to the root node).
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  • MDB behaviour in Clustered environment

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  • How in Clustered environment Singleton work

    In multiple server environment, ( ie. clustered env) if we have some singleton classes how it will work ?

    You can load a class multiple times in a single VM
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  • File resources in clustered environment

              I understand that resource on file system cannot be clustered.
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    I don't think that there is any standard way of doing this.
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              Praveen Peddi wrote:
              > I understand that resource on file system cannot be clustered.
              > We have an application packaged as an ear file but unfortunately we get the properties
              > files from the file system. We usually copy these resources while installing our
              > application.
              >
              > Now we are trying to deploy our application in a clustered environment and when
              > all my servers in the clcuster r on the same machine everything worked fine. Now
              > I created another server on a different machine.
              > The ear file file got transfered fine but the application is not able to find
              > the properties since the resource file are not copied over to that machine. I
              > know this is an expected behaviour but my question is: Is there anyway workaround
              > to avoid thsi problem. For example, can we tell weblogic to take care of copying
              > these resources along with the whole application
              > (ear file).
              >
              > Praveen
              

  • FTP Adapter On in a Clustered Environment

    Hi everyone,
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  • Singleton object in clustered enviornment

    Hi,
              In my web application which is deployed in clustered enviornment, I am facing problem for singleton object.
              I need to share object among all servers in the clustered.
              I am using weblogic server 9.2. I have tried its Singleton services, but it doesnt work as expected.
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    No. If you need this type of functionality, use Coherence.
              http://www.tangosol.com/coherence.jsp
              Peace,
              Cameron Purdy
              Tangosol, Inc.
              http://www.tangosol.com/coherence.jsp
              Tangosol Coherence: Clustered Replicated Cache for Weblogic
              "Ferruccio" <[email protected]> wrote in message
              news:[email protected]..
              > Hi,
              > I have a very basic question. In a WebLogic clustered
              > environment, is a Singleton replicated? In other words, if the
              > mySingleton on node A in a cluster is updated with a piece of data,
              > will this show in the mySingleton in node B?
              >
              > Thanks
              >
              > Ciao
              > Ferruccio
              

  • Issue in Synchronous File Read in clustered environment

    Hi,
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    No Data to process.
    File /root/oracle/domains/osb/11.1.1.4/cluster/data/osb2/FolderNamer/Filename.txt to be processed was not found or not available or has no content Please make sure that the file exists in the specified directory.
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    File /root/oracle/domains/osb/11.1.1.4/cluster/data/osb2/FolderName/Filename.txt to be processed was not found or not available or has no content ; nested exception is:
    BINDING.JCA-11007
    No Data to process.
    No Data to process.
    File /root/oracle/domains/osb/11.1.1.4/cluster/data/osb2/FolderName/Filename.txt to be processed was not found or not available or has no content Please make sure that the file exists in the specified directory.
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    at com.bea.wli.sb.transports.jca.JCATransportEndpoint.send(JCATransportEndpoint.java:170)
    at com.bea.wli.sb.transports.jca.JCATransportProvider.sendMessageAsync(JCATransportProvider.java:598)
    at sun.reflect.GeneratedMethodAccessor1115.invoke(Unknown Source)
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    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.bea.wli.sb.transports.Util$1.invoke(Util.java:83)
    at $Proxy142.sendMessageAsync(Unknown Source)
    at com.bea.wli.sb.transports.LoadBalanceFailoverListener.sendMessageAsync(LoadBalanceFailoverListener.java:148)
    at com.bea.wli.sb.transports.LoadBalanceFailoverListener.sendMessageToServiceAsync(LoadBalanceFailoverListener.java:603)
    at com.bea.wli.sb.transports.LoadBalanceFailoverListener.sendMessageToService(LoadBalanceFailoverListener.java:538)
    at com.bea.wli.sb.transports.TransportManagerImpl.sendMessageToService(TransportManagerImpl.java:558)
    at com.bea.wli.sb.transports.TransportManagerImpl.sendMessageAsync(TransportManagerImpl.java:426)
    at com.bea.wli.sb.pipeline.PipelineContextImpl.doDispatch(PipelineContextImpl.java:670)
    at com.bea.wli.sb.pipeline.PipelineContextImpl.dispatchSync(PipelineContextImpl.java:551)
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    at com.bea.wli.sb.stages.StageMetadataImpl$WrapperRuntimeStep.processMessage(StageMetadataImpl.java:346)
    at com.bea.wli.sb.stages.impl.SequenceRuntimeStep.processMessage(SequenceRuntimeStep.java:33)
    at com.bea.wli.sb.pipeline.PipelineStage.processMessage(PipelineStage.java:84)
    at com.bea.wli.sb.pipeline.PipelineContextImpl.execute(PipelineContextImpl.java:1055)
    at com.bea.wli.sb.pipeline.Pipeline.processMessage(Pipeline.java:141)
    at com.bea.wli.sb.pipeline.PipelineContextImpl.execute(PipelineContextImpl.java:1055)
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    at com.bea.wli.sb.pipeline.RouterManager$1.run(RouterManager.java:593)
    at com.bea.wli.sb.pipeline.RouterManager$1.run(RouterManager.java:591)
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    No Data to process.
    File /root/oracle/domains/osb/11.1.1.4/cluster/data/osb2/FolderName/Filename.txt to be processed was not found or not available or has no content ; nested exception is:
    BINDING.JCA-11007
    No Data to process.
    No Data to process.
    File /root/oracle/domains/osb/11.1.1.4/cluster/data/osb2/FolderName/Filename.txt to be processed was not found or not available or has no content Please make sure that the file exists in the specified directory.
    at oracle.tip.adapter.sa.impl.JCABindingReferenceImpl.request(JCABindingReferenceImpl.java:259)
    at com.bea.wli.sb.transports.jca.binding.JCATransportOutboundOperationBindingServiceImpl.invoke(JCATransportOutboundOperationBindingServiceImpl.java:150)
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    No Data to process.
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    BINDING.JCA-11007
    No Data to process.
    No Data to process.
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    at oracle.tip.adapter.sa.impl.fw.wsif.jca.WSIFOperation_JCA.executeRequestResponseOperation(WSIFOperation_JCA.java:312)
    at oracle.tip.adapter.sa.impl.JCABindingReferenceImpl.invokeWsifProvider(JCABindingReferenceImpl.java:350)
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    ... 57 more
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    No Data to process.
    No Data to process.
    File /root/oracle/domains/osb/11.1.1.4/cluster/data/osb2/FolderName/Filename.txt to be processed was not found or not available or has no content Please make sure that the file exists in the specified directory.
    at oracle.tip.adapter.file.outbound.FileReader.readFile(FileReader.java:277)
    at oracle.tip.adapter.file.outbound.FileReader.executeFileRead(FileReader.java:181)
    at oracle.tip.adapter.file.outbound.FileInteraction.executeFileRead(FileInteraction.java:331)
    at oracle.tip.adapter.file.outbound.FileInteraction.execute(FileInteraction.java:395)
    at oracle.tip.adapter.sa.impl.fw.wsif.jca.WSIFOperation_JCA.performOperation(WSIFOperation_JCA.java:529)
    ... 61 more
    Edited by: 842347 on Jul 6, 2011 3:11 AM

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    Dear Aravindth
      (.*?) means -> Select all contents from where you start and end,
    For Ex. <month>(.*?)</month> then Select for start <month> and end last </month> tag.
    (?) Match zero or one occurrences. Equivalent to {0,1}.
    (*) Match zero or more occurrences. Equivalent to {0,}.
    (+) Match one or more occurrences. Equivalent to {1,}.
    (.) (Dot). Match any character except newline or another Unicode line terminator.
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    This is a known problem with clustered environment. Remember that your portal component runs on just on dialog instance and it doesn't automatically have access to the other nodes.  However, there are some ways to get around this
    1. Use KM to store files. KM is a common repository for all application servers and therefore you needn't worry more
    2. Use an external batch oriented product (suresync/robocopy) to synch folders on the different DIs. You basically use your existing portal component, but there is a batch job which makes sure the upload folder is identical on all DIs (however, there is a slight delay depending on how often you run the batch job)
    3. Store the files on a shared disk directly from the portal component.
    Cheers
    Dagfinn

  • Issue while polling in clustered environment.

    Hi All,
    I am using a polling adapter which polls records from two database tables. I have set Database rows per transaction as 10 and polling interval as 30 secs. Our servers are running in clustered mode.
    The issue is that, when the rows are picked by node 1 , without waiting for the polling interval node 2 picks up the next set of rows from database.
    As per our requirement, rows should be polled according to the value of Database rows per transaction size. Then adapter should wait for the polling interval and then pick up the next set of rows (in the clustered environment only). Can it be achieved using custom SQL or some java code. If anyone has tried it please help me.
    Thanks in advance.

    See this is misconception that both nodes picks the data in turn one by one.
    It totally depends on the availability of the nodes. This is how a typical active active cluster should behave.
    Both nodes will show similar set of instances as they are pointing to same soa_infra schema.
    We can not differentiate by checking EM that which node actually processed a particular instances.
    I would like to know how are you sure that both nodes are picking file one by one without waiting other one to complete its job.
    I have experience with Active active cluster with uses of DB Adapter in many scenarios. But I never observed this behavior.
    Probably by understanding your applications architecture, answer to your problem can be found.
    Thanks,
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  • File Protocol in OSB Clustered Environment

    Hi ,
    I have a OSB Server in a Clustered Environment ....
    Here Admin Server is in Machine1
    Managed Server1 is in Machine 2
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    I have Access to Machine1 Unix Box where the Admin Server is Installed ...I can get the File only in this Location and have to Read the Same from here , So i was planning to Use File Protocol for Polling the Message from Admin Server .Since OSB has option for Selecting only the Managed Server , I would request suggestions how i can Read the Data from this Admin Server by using File Protocol .

    have you used "service type" as "Messaging Service" ? that should give you all the options you need

  • Not able to access the application through URL in clustered environment.

    Hi,
    I recently depoyed my application on clustered environment of weblogic 8.1 SP4.
    Now I am able to access the application through the managed server name with port number but not able to access through URL.
    For ex
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    If I use
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    any HTML or JSP page page is in reach by both the URL.
    Please suggest me what should I do in this regard.
    thanks
    singhV

    Hi Syed,
    I meant to ask are you able to see the application you created in Hyperion Planning Login page,if yes try accessing the created application through Hyperion Planning(Try restarting Planning Services once even if you are able to launch hyperion planning page) url "http://servername:8300/HyperionPlanning and selecting the application you created.
    And also could you please let me know if you are logging in to workspace through admin username ? and also check if you are able to see the application in shared services and try to provision any group on that application.
    (The Assumptions are if application is not created successfully then it will not be available in workspace to launch and if its in maintainance mode (Application Maintenance Mode) in Application Settings and last would be check OHS and Hyperion Planning Services)
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