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Aggregation computation over distributed data streams(the final version)

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Yueshen Xu
Yueshen Xu

I have fixed a few mistakes in the original version and appended some new contents. Likewise, I hope it is of help for you.

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A ggregation C omputation Over D istributed D ata S treams (partial content) Yueshen Xu [email_address] Middleware, CCNT Zhejiang Univ Middleware, CCNT, ZJU 12/19/11
Paper reference ,[object Object],[object Object],[object Object],[object Object],12/19/11 Middleware, CCNT, ZJU ,[object Object],Bell Lab Expert/27 Rutgers Expert/45 !
Background ,[object Object],[object Object],[object Object],[object Object],12/19/11 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],12/19/11 Middleware, CCNT, ZJU All resources are restricted ,[object Object],[object Object],[object Object],What’s different?
Trouble ,[object Object],[object Object],12/19/11 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],12/19/11 Middleware, CCNT, ZJU Not strange contacting with data streams Why only aggregation?  transaction Mirror the topic in data base
Problems and Concerns ,[object Object],[object Object],[object Object],[object Object],12/19/11 Middleware, CCNT, ZJU ,[object Object],[object Object],[object Object],! Features attached to those algorithms applied to distributed environments ,[object Object],[object Object]
Distinct Counting: Flajolet-Martin Sketch ,[object Object],[object Object],[object Object],[object Object],[object Object],12/19/11 Middleware, CCNT, ZJU ,[object Object],[object Object],[object Object],Be appropriate for using in data streams inherently Just think about one scene in TaoBao
Flajolet-Martin Sketch(Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],12/19/11 Middleware, CCNT, ZJU counting not computing 1 1 … 0 0 PPT VS Whiteboard ? x record h(x) 1 L
Flajolet-Martin Sketch(Cont.) ,[object Object],[object Object],12/19/11 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],1 0 … 1 0 Bitmap 1 L
Flajolet-Martin Sketch(Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],12/19/11 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],12/19/11 Middleware, CCNT, ZJU nice qualities for distributed aggregation
Question ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],12/19/11 Middleware, CCNT, ZJU What’s skyline?
[object Object],12/19/11 Middleware, CCNT, ZJU

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Aggregation computation over distributed data streams(the final version)

  • 1. A ggregation C omputation Over D istributed D ata S treams (partial content) Yueshen Xu [email_address] Middleware, CCNT Zhejiang Univ Middleware, CCNT, ZJU 12/19/11
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