NDLI: Proportional Delay Differentiation Service in Web Application Servers: A Feedback Control Approach

Content Provider	IEEE Xplore Digital Library
Author	Wenping Pan Dejun Mu Hangxing Wu Qilu Sun
Copyright Year	2008
Description	Author affiliation: Coll. of Autom., Northwestern Polytech. Univ., Xi'an (Wenping Pan; Dejun Mu; Hangxing Wu; Qilu Sun)
Abstract	As more and more business applications become Web-enabled, service differentiation becomes an important issue for database-driven e-commerce Websites to meet different requirements of clients. This paper presents a feedback control approach to provide proportional delay differentiation (PDD) service in Web application servers handling dynamic HTTP requests. To achieve this goal, an approximate linear time-invariant model of the database connection pool (DBCP) in Web application servers is identified experimentally and used to design a proportional-integral (PI) controller. At each sampling time, the controller can dynamically calculate and adjust the probabilities for different classes of dynamic requests to get idle database connections in the next sampling period, according to the error between the measured delay ratio and the reference value. Three kinds of workloads, which follow deterministic, uniform and heavy-tailed distributions respectively, are designed to evaluate the performance of the closed-loop system. Experiment results indicate the controller is effective in handling varying workloads, and PDD can be achieved in the DBCP even if the number of concurrent dynamic requests changes abruptly under different kinds of workloads.
Starting Page	600
Ending Page	604
File Size	312074
Page Count	5
File Format	PDF
ISBN	9780769532905
DOI	10.1109/CCCM.2008.195
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-08-03
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Feedback Control Databases Artificial neural networks Quality of service Web Application Server Service Differentiation Time measurement Servers Web server Delay
Content Type	Text
Resource Type	Article

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