Work load management for EJB

Workload management for EJB containers can be performed by configuring the Web container and EJB containers on separate application servers. Multiple application servers with the EJB containers can be clustered, enabling the distribution of EJB requests between the EJB containers

In this configuration, EJB client requests are routed to available EJB containers in a round-robin fashion based on assigned server weights. The EJB clients can be servlets operating within a Web container, stand-alone Java programs using RMI/IIOP, or other EJBs.

The server-weighted, round-robin routing policy ensures a distribution based on the set of server weights that have been assigned to the members of a cluster. For example, if all servers in the cluster have the same weight, the expected distribution for the cluster is that all servers receive the same number of requests. If the weights for the servers are not equal, the distribution mechanism sends more requests to the higher weight value servers than the lower weight value servers. The policy ensures the desired distribution based on the weights assigned to the cluster members.

You can also choose to have requests sent to the node on which the client resides as the preferred routing. In this case, only cluster members on that node are chosen (using the round-robin weight method). Cluster members on remote nodes are chosen only if a local server is not available.

When planning for clustering, determine the number of application servers and
their physical location. Determine the server weights to assign for application servers based on considerations such as system stability and speed. When creating the cluster, consider using the prefer local setting to ensure that when a client (for example, a servlet) calls an EJB, WLM will attempt to select the EJB on the same system as the client, eliminating network communication.

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