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Freire’s seminar

By admin | April 17, 2013

Speaker: Ana Freire

Date: 2013 April, 24
Time: 11:00 a.m.
Duration: 60′
Room: C-29 (Faedo room)
Title: Scheduling queries across distributed and replicated IR systems.

Abstract:

Search engines use replication and distribution of large indices across many query servers to achieve efficient retrieval. Under high query load, queries can be scheduled to replicas that are expected to be idle soonest. In this seminar, we will show the conditions for which query scheduling can provide benefits to the waiting time experienced by a query. In particular, we have deployed a well-studied simulation framework, which implements different scheduling methods for real Web search queries with known arrival times. Our experiments using different numbers of shards and replicas show that the use of predicted query response times for scheduling can markedly reduce the waiting time experienced by a query under high query volume.

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