Abstract

We design an adaptive admission control mechanism, network early warning system (NEWS), to protect servers and networks from flash crowds and maintain high performance for end-users. NEWS detects flash crowds from performance degradation in responses and mitigates flash crowds by admitting incoming requests adaptively. We evaluate NEWS performance with both simulations and testbed experiments. We first investigate a network-limited scenarion in simulations. We find that NEWS detects flash crowds within 20 seconds. By discarding 32% of incoming requests, NEWS protects the target server and networks from overloading, reducing the response packet drop rate from 25% to 2%. For admitted requests, NEWS increases their response rate by two times. This performance is similar to the best static rate limiter deployed in the same scenario. We also investigate the impact of detection intervals on …

Date

2005

Authors

Xuan Chen, John Heidemann

Journal

ACM Transactions on Internet Technology (TOIT)

Volume

5

Issue

3

Pages

532-569

Publisher

ACM