Issue No.04 - April (2010 vol.22)
Ying Zhang , University of New South Wales and NICTA, Sydney
Xuemin Lin , University of New South Wales and NICTA, Sydney
Yidong Yuan , University of New South Wales and NICTA, Sydney
Masaru Kitsuregawa , University of Tokyo, Tokyo
Xiaofang Zhou , University of Queensland, Brisbane
Jeffrey Xu Yu , Chinese University of Hong Kong, Hong Kong
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/TKDE.2009.68
Duplicates in data streams may often be observed by the projection on a subspace and/or multiple recordings of objects. Without the uniqueness assumption on observed data elements, many conventional aggregates computation problems need to be further investigated due to their duplication-sensitive nature. In this paper, we present novel, space-efficient, one-scan algorithms to continuously maintain duplicate-insensitive order sketches so that rank-based queries can be approximately processed with a relative rank error guarantee \epsilon in the presence of data duplicates. Besides the space efficiency, the proposed algorithms are time-efficient and highly accurate. Moreover, our techniques may be immediately applied to the heavy hitter problem against distinct elements and to the existing fault-tolerant distributed communication techniques. A comprehensive performance study demonstrates that our algorithms can support real-time computation against high-speed data streams.
Order statistic, data stream, duplicate insensitive, relative error.
Ying Zhang, Xuemin Lin, Yidong Yuan, Masaru Kitsuregawa, Xiaofang Zhou, Jeffrey Xu Yu, "Duplicate-Insensitive Order Statistics Computation over Data Streams", IEEE Transactions on Knowledge & Data Engineering, vol.22, no. 4, pp. 493-507, April 2010, doi:10.1109/TKDE.2009.68