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Aggregation computation over distributed data streams

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Yueshen Xu
Yueshen Xu

This ppt is my another learning report addressed in the lab which was composed by myself. I hope it is of help and use to you friends.

EducationTechnology
1 of 14
A ggregation C omputation O ver D istributed D ata S treams (partial content) Yueshen Xu Middleware, CCNT Zhejiang University Middleware, CCNT, ZJU 12/15/11
Paper reference ,[object Object],[object Object],[object Object],[object Object],12/15/11 Middleware, CCNT, ZJU ,[object Object],Bell Lab Expert/27 Rutgers Expert/45 !
Background ,[object Object],[object Object],[object Object],[object Object],12/15/11 Middleware, CCNT, ZJU Just one example ,[object Object],[object Object],[object Object],[object Object],VS
Constraints and Features ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],12/15/11 Middleware, CCNT, ZJU All resources are restricted ,[object Object],[object Object],What’s different?
Trouble ,[object Object],[object Object],12/15/11 Middleware, CCNT, ZJU ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],  root of all evil
Topic ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],12/15/11 Middleware, CCNT, ZJU Not strange contacting with data streams Why aggregation?  transaction
Problems and Concerns ,[object Object],[object Object],[object Object],[object Object],12/15/11 Middleware, CCNT, ZJU ,[object Object],[object Object],[object Object],! Features attached to those algorithms applied to distributed environments
Distinct Counting: Flajolet-Martin Sketch ,[object Object],[object Object],[object Object],[object Object],[object Object],12/15/11 Middleware, CCNT, ZJU ,[object Object],[object Object],Be appropriate for using in data streams inherently
Flajolet-Martin Sketch(Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],12/15/11 Middleware, CCNT, ZJU counting not computing 1 1 … 0 B 0 PPT VS Whiteboard ? x record h(x) 1 L
Flajolet-Martin Sketch(Cont.) ,[object Object],[object Object],12/15/11 Middleware, CCNT, ZJU for i:=1 to L do bitmap[i] :=0 for all x in M do begin index := p(hash(x)); if bitmap[index] = the bitmap[index] :=1; end ,[object Object]
Flajolet-Martin Sketch(Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],12/15/11 Middleware, CCNT, ZJU U ,[object Object],for i:=1 to L do bitmap[i] :=0 for all x in M do begin index := p(hash(x)); if bitmap[index] = the bitmap[index] :=1; end
Flajolet-Martin Sketch(Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],12/15/11 Middleware, CCNT, ZJU nice qualities for distributed aggregation
Question ,[object Object],[object Object],[object Object],[object Object],12/15/11 Middleware, CCNT, ZJU
[object Object],12/15/11 Middleware, CCNT, ZJU

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Aggregation computation over distributed data streams

  • 1. A ggregation C omputation O ver D istributed D ata S treams (partial content) Yueshen Xu Middleware, CCNT Zhejiang University Middleware, CCNT, ZJU 12/15/11
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