Abstract: A system and method are provided for operating a pool of workers within a distributed computing system, wherein each of multiple computers host one or more workers. Each computer also hosts ledgers for one or more originators of tasks that are submitted to the pool for processing. A ledger identifies tasks from the corresponding originator that have been submitted to the pool and that have not yet been completed. When an originator submits a new task, the system (e.g., a coordinator) identifies a maximum number of concurrent tasks permitted the originator and determines, with reference to the originator's ledger, whether the task can be submitted to the pool without exceeding the limit. If so, the task is assigned to an idle worker (if any) and is added to the originator's ledger. After completion, the task is removed from the ledger. Obsolete or stale entries are periodically purged from originators' ledgers.

Abstract: Described herein are methods and systems for implementing personalized targeting via electronic coupons, providing aggregate cap control of electronic coupons, implementing viral marketing using electronic coupons, and performing real time processing of electronic coupons.