US Patent 8725862 Server selection based upon time and query dependent hashing

In general, the subject matter described in this specification can be embodied in methods, systems, and program products for selecting a server from a plurality of servers to process a query. A query is converted into a query number. A hashing operation is performed on a combination of the query number and a second number that is associated with a present time interval. The hashing operation generates a hash value associated with the query and the present time interval. A length of the present time interval is increased as a quantity of servers in a plurality of servers increases. A server in the plurality of servers is selected to process the query, based on the hash value. The query is sent to the selected server.