Replication for web hosting systems
TL;DR: To identify the key issues in designing a wide-area replica hosting system, this work presents an architectural framework that assists in characterizing different systems in a systematic manner and categorizes different research efforts and review their relative merits and demerits.
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Abstract: Replication is a well-known technique to improve the accessibility of Web sites. It generally offers reduced client latencies and increases a site's availability. However, applying replication techniques is not trivial, and various Content Delivery Networks (CDNs) have been created to facilitate replication for digital content providers. The success of these CDNs has triggered further research efforts into developing advanced Web replica hosting systems. These are systems that host the documents of a website and manage replication automatically. To identify the key issues in designing a wide-area replica hosting system, we present an architectural framework. The framework assists in characterizing different systems in a systematic manner. We categorize different research efforts and review their relative merits and demerits. As an important side-effect, this review and characterization shows that there a number of interesting research questions that have not received much attention yet, but which deserve exploration by the research community.
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Figures
Table I. Summary of strategies adopted by four different CDNs 
Fig. 3. Interactions between different components of a wide-area replica hosting system. 
Table III. A comparison of approaches for enforcing consistency. 
Fig. 5. Positioning in GNP 
Fig. 6. Positioning in Lighthouses 
Table IV. The comparison of representative implementations of a redirection system
Citations
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Paul V. Mockapetris
- 01 Nov 1987
TL;DR: This RFC is the revised specification of the protocol and format used in the implementation of the Domain Name System and it obsoletes RFC-883.
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