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Writing Customized Load Balancing Algorithm

Logi Report Server Cluster provides a load balancing mechanism which ensures the servers in the cluster to work more effectively. You can also write your own load balancing algorithm using the Logi Report Server API. This topic describes how you can apply a customized load balancing algorithm via API.

If you create a load balancing algorithm via API, it will take effect in place of other built-in load balance algorithms you have set. For more information, see the interface jet.server.api.cluster.LoadBalancer in the Logi Report Javadoc.

The demo file DemoLoadBalancer.java shows how to customize load balancing using API. You can find it in <install_root>\help\samples\APICluster.

Take the following steps to apply customized load balancing algorithm:

1. Compile DemoLoadBalancer.java to generate the class file as follows (when compiling DemoLoadBalancer.java, you need to add JRESServlets.jar to the class path):
   

   javac -classpath <install_root>\lib\JRESServlets.jar DemoLoadBalancer.java

2. Add DemoLoadBalancer.class to the class path of setenv.bat in the ADDCLASSPATH variable.
3. Add the parameter -Dloadbalance.custom_class=DemoLoadBalancer to the server's startup file JRServer.bat which locates in <install_root>\bin. For example:

   "%JAVAHOME%\bin\java.exe" -Dloadbalance.custom_class=DemoLoadBalancer "-Dinstall.root=%REPORTHOME%" ...

4. Launch JRServer.bat, and the customized load balancer DemoLoadBalancer will then be applied.
5. Submit some tasks for running. You can now find that these tasks are allocated to the clustered servers based on the DemoLoadBalancer code.

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