There are no specific hardware or
server software requirements. Availability is achieved by replication, and strong replica
consistency is automatically guaranteed by using off-the-shelf group communication components.
The proposed architecture is explained in detail, and it is compared against some
of the most relevant highly-available solutions used nowadays. The most distinctive feature
of the proposed architecture is that it explicitly addresses replica consistency, providing
automatic strong replica consistency. Besides automatic consistency, attention is given to
simplicity and pluggability.
Automat c Repl cat on for Web Appl cat ons
Copyright ?© 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission
of Idea Group Inc. is prohibited.
Introduction
Since the invention of the World Wide Web, we have seen an explosive increase in the
number of running Websites and a continuous increase in the importance of Websites as
fundamental parts of business strategies. Today, more and more companies and organizations
rely on Websites to offer their products and services, up to the extent that Website unavailability
means, in many cases, profit losses.
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