A method, system, and computer-readable medium are disclosed for executing high-speed transaction processing in a parallel processing environment. One embodiment is directed to a computer-implemented method for executing high-speed transaction processing in a processing cluster having a driver and a plurality of executors, each of the executors configured to process data in at least one respective partition. The driver may assign billing transaction data stored on a persistent datastore of a billing system to respective partitions of the plurality of executors for parallel processing. The driver and executors execute operations in which usage factors of the billing transactions are aggregated to generate billable charge information in a format for use by a billing system to generate billing invoices.