A technique for implementing a load balanced
server farm
system is described which may be used for effecting electronic commerce over a data network. The
system comprises a load balancing
system and a plurality of servers in communication with the load balancing system. Each of the plurality of servers may include a respective
data cache for storing state information relating to
client session transactions conducted between the
server and a particular
client. The load balancing system is configured to select, using a load balancing protocol, an available first
server from the plurality of servers to process an initial packet received from a source device such as, for example, a
client machine of a customer. The load balancing system is also configured to
route subsequent packets received from the source device to the first server. In this way, a “stickiness” scheme may be implemented in the
server farm system whereby, once an electronic commerce session has been initiated between the first server and the source device, the first server may
handle all subsequent requests from the source device in order to make optimal use of the state data stored in the first server's
data cache. Before generating its response, the first server may verify that the state information relating to a specific client session stored in the
data cache is up-to-date. If the first server determines that the state information stored in the data cache is not up-to-date, then the first server may be configured to retrieve the desired up-to-date state information from a
database which is configured to store all state information relating to client sessions which have been initiated with the
server farm system.