In CentralServer HA deployments, the primary and backup CentralServer connect to each other via socket. If the primary CentralServer stops, the backup takes over, if the primary then comes back up, the primary takes back over and the backup goes back to standby. Only the active CentralServer handles data requests.
Data clients for the HA CentralServer have the following options for connecting:
via HA configured rtvdata servlet running on an application server other than the internal Jetty server. This option requires extra configuration of the rtvdata war files. High availability access to the servlets must be configured in the application server.
rtvquery data clients for CentralServer HA must connect via servlet running on an application server other than the internal Jetty server. This option requires extra configuration of the rtvquery war files. High availability access to the servlets must be configured in the application server.
via socket using a fault tolerant URL (//PRIMARYHOST:3278,//BACKUPHOST:3278).