Rate Control By Token Buckets

摘要

Aspects of the invention are provided for rate control and management of service requests. A token bucket is employed in conjunction with a capacity sharing scheme to manage processing of service requests. Each token represents the capacity reserved for a particular source of requests. Excess tokens may be shed, with the excess tokens representing available excess capacity. Similarly, a projected time at which the service request(s) may be released may be computed in the event the bucket does not contain the required quantity of tokens to process the request.

主权项

1. A method comprising:
maintaining a rate control mechanism for a source of requests, the rate control mechanism including a token bucket represented by a counter; the bucket accumulating tokens at a given rate until the counter reaches a token bucket burst size; in response to receiving a request, the request associated with a unit of work rate per measure of time, computing a quantity of accumulated tokens as a function of token bucket parameters, including updating a token bucket counter on demand and computing a time for granting the received request based on the updated token bucket counter; and servicing the request if the required quantity of tokens are accumulated, and computing a future time when the required quantity of tokens will be accumulated if the required quantity of tokens are unavailable.