Universidade Federal do Rio de Janeiro COPPE

Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia

Instituto de Matemática

 
Visualizar Meses
Visualizar Meses
Visualizar Flat
Visualizar Flat
Visualizar Semanas
Visualizar Semanas
Visualizar Dias
Visualizar Dias
Categorias
Categorias
Procurar
Procurar

Evento: 'Palestra Cooperação INRIA-PESC em Bancos de Dados'

Eventos PESC (Palestras, Seminários, etc.)
Palestras, Seminários, etc. do PESC/COPPE/UFRJ.
Data: Tuesday, April 14, 2009 At 13:30
Duração: 2 Horas

Convidamos para a palestra da Profa. Esther Pacitti, que marca o inicio da participacao do nosso grupo de pesquisas como equipe associada ao INRIA no projeto SARAVA- P2P data sharing for online communities.

Prof. Marta Mattoso

Data: 14/04/2009 (3a. feira), as 13:30h
Local: sala H-304b
Palestrante: Profa. Esther Pacitti, Universidade de Nantes e INRIA, França

Titulo: Flower-CDN: A hybrid P2P overlay for Efficient Query Processing in CDN
Autores: Manal El Dick, Esther Pacitti,Bettina Kemme

Many web-sites with a large user base, e.g., web-sites of non-profit organizations, do not have the financial means to install large web-servers or use specialized content distribution networks such as Akamai. For those web-sites, we have developed Flower-CDN, a locality-aware peer-to-peer based content-distribution network in which the users that are interested in a web-site support the distribution of its content. The idea is that peers keep the web-pages they retrieve and later serve them to other nodes that are close to them in locality. Our architecture is a hybrid between structured and
unstructured networks. When a node requests a web-page from a web-site for the first time, a locality-aware DTH quickly finds a peer in its neighborhood that has the web-page available. Additionally, all peers in a given region that maintain content of a particular web-site build an unstructured content overlay. Within a content overlay peers gossip information about their content allowing the system to maintain accurate information despite failures and churn. In our detailed performance evaluation we compare Flower-CDN with Squirrel, which is a content distribution network that is strictly based on DHTs and not locality aware. Compared to Squirrel, Flower-CDN reduces lookup latency by a factor of 9 and the transfer distance by a factor of 2. We also show that Flower-CDN's gossiping has low overhead and can be adjusted according to hit ratio requirements and bandwidth availability.


Procurar no Calendário

Powered by ExtCalendar 2

© 2017 PESC/COPPE - Programa de Engenharia de Sistemas e Computação

Cidade Universitária, Centro de Tecnologia, Bloco H, Sala 319
Caixa Postal: 68511 CEP: 21941-972 Fones: +55 21 3938-8672 / +55 21 3938-8673 Fax: +55 21 3938-8676
Rio de Janeiro - RJ - Brasil
Horário de atendimento da Secretaria: 2a. a 6a. de 7:00 às 16:00 horas (exceto feriados escolares)