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ROAR: Increasing the Flexibility and Performance of Distributed Search

Raiciu, C; Huici, F; Handley, M; Rosenblum, DS; (2009) ROAR: Increasing the Flexibility and Performance of Distributed Search. ACM SIGCOMM Computer Communication Review - SIGCOMM '09 , 39 (4) 10.1145/1594977.1592603.

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To search the web quickly, search engines partition the web index over many machines, and consult every partition when answering a query. To increase throughput, replicas are added for each of these machines. The key parameter of these algorithms is the trade-off between replication and partitioning: increasing the partitioning level improves query completion time since more servers handle the query, but may incur non-negligible startup costs for each sub-query. Finding the right operating point and adapting to it can significantly improve performance and reduce costs.We introduce Rendezvous On a Ring (ROAR), a novel distributed algorithm that enables on-the-fly re-configuration of the partitioning level. ROAR can add and remove servers without stopping the system, cope with server failures, and provide good load-balancing even with a heterogeneous server pool. We demonstrate these claims using a privacy-preserving search application built upon ROAR.

Title:ROAR: Increasing the Flexibility and Performance of Distributed Search
Event:SIGCOMM 2009 Conference
Location:Barcelona, SPAIN
Dates:2009-08-17 - 2009-08-21
Publisher version:http://dx.doi.org/10.1145/1594977.1592603
Keywords:Algorithms, Design
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Computer Science

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