Background..
Scalability in distributed systems was studied in Kartz, Butler, and McGrath (1995); Dias,
Kish, Mukherjee, and Tawari (1996); Baentsch, Baum, and Molter (1997); Obraczka
(1994); and Ould Mohamed-Salem (2002), and is mostly related to the scaling up of the
capacity of a system to support more users with more requests. Many solutions have been
proposed and implemented to enhance the capacity of systems. The proposed solutions
diverge according to their adopted approaches, and their applicability depends on the type
of service and architecture. Several approaches have been investigated in this context to
provide scalable solutions. Caching and prefetching are standard techniques used in distributed
systems to reduce the user response time. Caching documents close to clients that
need them reduces the number of server requests and the traffic associated with them. The
basic idea of prefetching stems from the fact that after retrieving a page from a server, a
user usually spends some time viewing the page and, during this period, the generally idle
A Scalable QoS-Aware Web Serv ces Management Arch tecture (QoSMA)
Copyright ?© 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission
of Idea Group Inc.
Pages:
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620