How does clustering work in weblogic

The default value is " none ", in which case the test auto-discovers the weblogic version. If the value of this parameter is not " none ", the test uses the value provided e. This parameter has been added to address cases when the eG agent is not able to discover the WebLogic server version. If this flag is set to No , the agent directly connects to the WebLogic server using the T3 protocol no other file needs to be deployed on the WebLogic server for this to work.

Note that the T3 protocol-based support is available for WebLogic servers ver. When monitoring a WebLogic server deployed on a Unix platform particularly, if the UseWarFile parameter is set to No , you have to make sure that the eG agent install user is added to the WebLogic users group. Specify the location of the WebLogic server's java archive Jar file.

If the UseWarFile flag is set to No , then the weblogic. Ideally this number must be equal to the actual number of servers in the cluster. Returns the rate of multicast messages received on this server from the cluster. Returns the rate of state-delta messages that had to be resent because a receiving server in the cluster missed a message.

Privacy Policy Terms of Use. Account Settings Logout. All Files. Submit Search. You are here:. WebLogic Clusters Test This test extracts cluster related statistics from a managed WebLogic server that is part of a cluster.

Configurable parameters for the test Parameter Description Test Period How often should the test be executed. Host The IP address of the host for which this test is to be configured. Port The port at which the specified host listens. User The admin user name of the WebLogic server being monitored.

Password The password of the specified admin user. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How does weblogic clustering work?

Ask Question. Asked 11 years, 1 month ago. Active 1 year, 3 months ago. Viewed 20k times. I'm new to weblogic. Maybe I got the whole concept wrong. Could anybody point me into the correct directions? Thanks so much. Improve this question.

Russell Russell 3, 7 7 gold badges 36 36 silver badges 46 46 bronze badges. Add a comment. Active Oldest Votes. I think you should understand the concept of Domain first. WebLogic Server clusters support multiple algorithms for load balancing clustered EJBs and RMI objects: round-robin, weight-based, random, round-robin-affinity, weight-based-affinity, and random-affinity. By default, a WebLogic Server cluster will use the round-robin method.

You can configure a cluster to use one of the other methods using the Administration Console. The method you select is maintained within the replica-aware stub obtained for clustered objects. WebLogic Server allows you to cluster JDBC objects, including data sources and multi data sources, to improve the availability of cluster-hosted applications.

Each JDBC object you configure for your cluster must exist on each managed server in the cluster—when you configure the JDBC objects, target them to the cluster. To achieve this result, data sources and multi data sources should be targeted to the cluster so they are cluster-aware and, if intended for use in external clients, their connections can be to any cluster members.

Clustering your JDBC objects does not enable failover of connections, but it can ease the process of reconnecting when a connection fails. In replicated database environments, multi data sources may be clustered to support database failover, and optionally, load balancing of connections. See the following topics for more information:. Load balancing is supported for JMS. To enable load balancing, you must configure targets for JMS servers.

You can still use these services on individual WebLogic Server instances in a cluster. However, the services do not make use of load balancing or failover features. This script outputs the product breadcrumb required for edocs documentation.

How Does a Cluster Relate to a Domain? What Are the Benefits of Clustering? What Are the Key Capabilities of a Cluster? Scalability The capacity of an application deployed on a WebLogic Server cluster can be increased dynamically to meet demand. High-Availability In a WebLogic Server cluster, application processing can continue when a server instance fails. For the new object to be able to take over for the failed object: There must be a copy of the failed object available to take over the job.

There must be information, available to other objects and the program that manages failover, defining the location and operational status of all objects—so that it can be determined that the first object failed before finishing its job. There must be information, available to other objects and the program that manages failover, about the progress of jobs in process—so that an object taking over an interrupted job knows how much of the job was completed before the first object failed, for example, what data has been changed, and what steps in the process were completed.

Note: For backward compatibility with previous versions, WebLogic Server also allows you to use multicast for communications between clusters. Ensuring uninterrupted availability of singleton services —services that must run on only a single server instance at any given time, such as JMS and the JTA transaction recovery system, when the hosting server instance fails. A Managed Server configured for automatic migration will be automatically migrated to another machine in the even of failure.

Easing the process of relocating a Managed Server, and all the services it hosts, as part of a planned system administration process. An administrator can initiate the migration of a Managed Server from the Administration Console or command line. There must be multiple copies of an object that can do a particular job. Information about the location and operational status of all objects must be available.

The cluster-aware nature of WebLogic data sources in external client applications allows a client to request another connection if the server instance hosting the previous connection fails.

Multi data sources—Multi data sources are an abstraction around a group of data sources that provides load balancing or failover processing between the data sources associated with the multi data source. Applications lookup a multi data source on the JNDI tree just like they do for data sources, and then request a database connection.