Storage Retrieval

Download Distributed Hash Table: Theory, Platforms and Applications by Hao Zhang, Yonggang Wen, Haiyong Xie, Nenghai Yu (auth.) PDF

By Hao Zhang, Yonggang Wen, Haiyong Xie, Nenghai Yu (auth.)

This SpringerBrief summarizes the advance of disbursed Hash desk in either educational and commercial fields. It covers the most thought, structures and functions of this key half in disbursed structures and purposes, particularly in large-scale disbursed environments. The authors train the foundations of a number of renowned DHT systems that could remedy useful difficulties equivalent to load stability, a number of replicas, consistency and latency. in addition they suggest DHT-based purposes together with multicast, anycast, allotted dossier platforms, seek, garage, content material supply community, dossier sharing and verbal exchange. those systems and functions are utilized in either educational and ads fields, making dispensed Hash desk a important source for researchers and professionals.

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Sample text

Therefore, the DHT based anycast application is still worth exploiting in the era of IPv6. 3 DNS The domain name system (DNS) is a naming system which translates domain names that are meaningful to humans into the IP addresses that are the numerical identifiers of computers in Internet. The unique IP identifiers are the foundation of the communications in Internet. Locating the host and selecting the route path all rely on the IP address. So DNS which provides the function of IP address lookup constitutes a critical component of Internet infrastructure.

4 OpenDHT OpenDHT [50,54] is a platform which provides free and public DHT services. It was established in 2005. Unlike usual DHT model, users of OpenDHT do not need to run as a DHT node. The OpenDHT infrastructure runs the OpenDHT code and provides interfaces to users to connect to it. User nodes issue RPC (Remote Procedure Call) to upper applications. OpenDHT nodes act as gateways accepting the RPC from clients. OpenDHT places a high premium on simplicity. There are three interfaces to simplify the operations and usages for users.

Secondly, anycast is limited by the scalability that global anycast application may lead to huge and unmanageable routing tables. Thirdly, the IP anycast requires the support of routers. Overlay anycast is the one way to solve the problem. Many overlay anycast architectures [96–99] employ proxies to manage the anycast group and record information about the hosts. So when an anycast request comes, the proxies choose the best target. Here many proxies existing in the network and much information should be stored and updated, so DHT may be used.

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