NDLI: Scalable Web server architectures

Content Provider	IEEE Xplore Digital Library
Author	Mourad, A. Huiqun Liu
Copyright Year	1997
Description	Author affiliation: Bell Labs., Lucent Technol., USA (Mourad, A.)
Abstract	A scalable web server architecture is key to enabling WWW sites to handle the ever increasing traffic loads. There is empirical evidence that, for the current generation of web server applications, multiprocessor platforms do not provide the needed scalability to handle large traffic volumes. This is primarily due to the fact that current TCP/IP implementations are single-threaded which severely limits the multiprocessor speedup for HTTP server applications. Therefore a distributed architecture consisting of independent servers sharing the load is more appropriate for implementing a scalable web server. Most current distributed server platforms typically use some form of Round-Robin or weighted Round-Robin implemented using the DNS server. This approach for distributing the load requires each HTTP server to handle requests for all the data stored at the site which implies that either each server must store its own copy of all the data available at the site or it must access the data from other HTTP servers or some dedicated back-end file or database servers thus generating significant back-end traffic. Neither of these options scale effectively because they lead to bottlenecks in the LAN or back-end servers or require significant additional resources. The "redirection-based" hierarchical server architecture eliminates bottlenecks in the server complex and allows for hardware to be added seamlessly to handle increases in load. In this approach, two levels of servers are used: redirection servers and normal HTTP servers. Data are partitioned according to their content and stored on different HTTP servers. Redirection servers are used to distribute the users' requests to the corresponding HTTP servers using the redirection mechanism supported by the HTTP protocol. This approach is completely transparent to the user, allows for intelligent distribution of load among servers, and achieves better caching efficiency compared with other load balancing schemes.
Starting Page	12
Ending Page	16
File Size	554262
Page Count	5
File Format	PDF
ISBN	0818678526
DOI	10.1109/ISCC.1997.615963
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-07-01
Publisher Place	Egypt
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Web server Service oriented architecture File servers World Wide Web Telecommunication traffic Scalability TCPIP Databases Local area networks Hardware
Content Type	Text
Resource Type	Article

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