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Managing a Logi Report Server Cluster

You can manage the servers in a Logi Report Server cluster if you are an administrator, using the Logi Report Server console. You can configure the performance weight for the clustered servers, balance the server load to make the servers work more effectively, and use Logi Report Server Monitor to monitor the status of each clustered server. This topic describes how to manage your server clusters using the Server Console.

Select the following links to view the topics:

• Configuring Performance Weight
• Balancing the Server Load
• Monitoring Clustered Servers

Configuring Performance Weight

If you have chosen the Weighted Min-load (loadbalance.type=2) algorithm for load balancing when creating a cluster, you will have to configure a performance weight for each clustered server in the cluster. The higher performance weight you set to a clustered server, the higher chance it may get selected by the server that has the active scheduler during load balancing.

To configure performance weight:

1. Start a clustered server in the cluster and log onto the server console.
2. Point to Administration on the system toolbar, select Configuration > Cluster > Weight from the drop-down menu to display the Weight page.

   

3. In the weight table, specify a weight value for each clustered server manually. Performance weight is a positive float number.
4. Select OK to save the weight values.
5. If you want to test each clustered server's performance weight value at current time, specify a catalog and a report that will be used for the testing in the Catalog and Report text boxes and then select Test.

The following two examples show how Least Weighted Current Reports algorithm works:

Example 1 - when there are free servers:

Example 2 - when there are no free servers:

Balancing the Server Load

In a cluster environment, Logi Report Server provides a load balancing mechanism which enables the server to work more effectively.

Load balancing process

1. When the time of a scheduled task arrives, active schedulers compete, and the winner gets to trigger the schedule.
2. The server that has the active scheduler selects a server in the cluster according to the load balancing algorithm specified which can either be a built-in one or a customized one, and then sends the task to the selected server.

You can also write your own load balancing algorithm based on the API included in Logi Report Server. For details, see Writing Customized Load Balancing Algorithm via API.

Monitoring Clustered Servers

If you have Logi Report Server Monitor installed, you can use it to monitor the status of each clustered server. First, you should do the following:

1. Modify the server.properties file in <monitor_install_root>\bin to configure the IP address and port information of one clustered server.
2. Copy rmi.auth from <server_install_root>\bin of the clustered server whose IP address and port information you modified in the last step to <monitor_install_root>\bin, or remove rmi.auth from <server_install_root>\bin of this clustered server.
3. Start Logi Report Server.
4. Launch MonitorServer.bat in <monitor_install_root>\bin to start Logi Report Server Monitor.
5. Access Logi Report Server Monitor using http://monitorhost:monitorport (default port is 8848), or by selecting Monitor on the Administration > Other drop-down menu in the Logi Report Server console.

   Note: To display Monitor on the Administration > Other drop-down menu in the server console, set the property web.monitor.link.enable to true in the server.properties file in <server_install_root>\bin. You can specify the monitor port by setting monitor.jmx.htmladaptor.port in server.properties.

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