Balancing a WS-Notification workload across application servers

Configure a server topology such that Web service clients using the WS-Notification standard are workload-balanced across the available resources.

About this task

WS-Notification enables server topologies in which Web service clients connecting to the notification broker inbound service are distributed across a set of logically equivalent servers. This configuration is described in the Network deployment of WS-Notification use pattern. You achieve this configuration by deploying a WS-Notification service across multiple servers in a network deployment environment, then configuring a WebSphere® Application Server proxy server as the central point to which applications connect, and providing it with the knowledge of which servers should receive client requests (that is, where the WS-Notification service points are configured).

To configure a distributed connected servers WS-Notification solution, complete the following steps:

Procedure

  1. Use the task Configuring a WS-Notification service for use only by WS-Notification applications to create a fully-configured WS-Notification service that contains two or more WS-Notification service points on different servers.
  2. Create a proxy server inside the cell on which the WS-Notification service is defined. After the proxy is created you must configure it to route requests to the cluster, which might include configuring the virtual host settings.
  3. Ensure that the URL root of each endpoint listener accurately reflects the details of the proxy server, so that applications requesting the WSDL for the service use the proxy server as the external entry point to the service. For more information, see Modifying an existing endpoint listener configuration.

Results

Requests for the notification broker inbound service are automatically work load balanced across the available servers. When affinity with a particular server is established, for example by creating a subscription, information is stored in the WS-Addressing endpoint reference given to the application client. Consequently, subsequent requests that relate to that subscription are automatically returned to the same server.



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Last updated: Feb 19, 2011 5:25:36 AM CST
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