Computing time-decayed aggregates in data streams

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United States of America Patent

PATENT NO 8908554
SERIAL NO

13755621

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Abstract

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Aggregates are calculated from a data stream in which data is sent in a sequence of tuples, in which each tuple comprises an item identifier and a timestamp indicating when the tuple was transmitted. The tuples may arrive out-of-order, that is, the sequence in which the tuples arrive are not necessarily in the sequence of their corresponding timestamps. In calculating aggregates, more recent data may be given more weight by multiplying each tuple by a decay function which is a function of the timestamp associated with the tuple and the current time. The tuples are recorded in a quantile-digest data structure. Aggregates are calculated from the data stored in the quantile-digest data structure.

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Patent Owner(s)

  • AT&T INTELLECTUAL PROPERTY I, L.P.;IOWA STATE UNIVERSITY RESEARCH FOUNDATION, INC.

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cormode, Graham Morristown, US 39 512
Korn, Philip New York, US 11 111
Tirthapura, Srikanta Ames, US 4 30

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