Adding New Members to an Existing Cluster
To add additional Presto Servers to an existing cluster
1. Install the Presto Server. See Installing webMethods and Intelligent Business Operations Products for instructions.
3. If the cluster has a shared external configuration folder, add this folder and any subfolders to the classpath for the Presto Server’s application server to enable access to this shared configuration.
Depending on your application server, you may update the classpath in the administration console, in configuration files or in the startup script for the application server. See documentation for your application server for more information.
4. If the cluster does not have a shared external configuration folder, copy the configuration and extension files from an existing Presto Server in the cluster to the new Presto Server.
See
Presto
File-Based Configuration and Extensions for a list of files and folders to copy. Be sure to also copy the JDBC drivers used for database mashables and mashups. See
Sharing JDBC Drivers in Clustered Environments for more information.
5. Copy the server configuration that cannot be shared from an existing Presto Server in the cluster to the new Presto Server. See Presto
File-Based Configuration and Extensions for details on the files and locations for this step. 6. Update the application server that hosts the new Presto Server with the same cluster configuration as other cluster members.
In addition to the basic cluster configuration required by your application server and load balancer, Presto has a single requirement for application-layer cluster configuration. You must either:
Enable session replication in each application server in the cluster.
Enable session affinity, sometimes also called ’sticky sessions,’ in the load balancer.
Or do both.
See documentation for your application server and/or load balancer for information on how to do this.
7. Restart the new Presto Server.
