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When quoting this document, please refer to the following
DOI: 10.4230/LIPIcs.ICDT.2016.13
URN: urn:nbn:de:0030-drops-57829
URL: http://drops.dagstuhl.de/opus/volltexte/2016/5782/
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Konrad, Christian

Streaming Partitioning of Sequences and Trees

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Abstract

We study streaming algorithms for partitioning integer sequences and trees. In the case of trees, we suppose that the input tree is provided by a stream consisting of a depth-first-traversal of the input tree. This captures the problem of partitioning XML streams, among other problems. We show that both problems admit deterministic (1+epsilon)-approximation streaming algorithms, where a single pass is sufficient for integer sequences and two passes are required for trees. The space complexity for partitioning integer sequences is O((1/epsilon) * p * log(nm)) and for partitioning trees is O((1/epsilon) * p^2 * log(nm)), where n is the length of the input stream, m is the maximal weight of an element in the stream, and p is the number of partitions to be created. Furthermore, for the problem of partitioning integer sequences, we show that computing an optimal solution in one pass requires Omega(n) space, and computing a (1+epsilon)-approximation in one pass requires Omega((1/epsilon) * log(n)) space, rendering our algorithm tight for instances with p,m in O(1).

BibTeX - Entry

@InProceedings{konrad:LIPIcs:2016:5782,
  author =	{Christian Konrad},
  title =	{{Streaming Partitioning of Sequences and Trees}},
  booktitle =	{19th International Conference on Database Theory (ICDT 2016)},
  pages =	{13:1--13:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-002-6},
  ISSN =	{1868-8969},
  year =	{2016},
  volume =	{48},
  editor =	{Wim Martens and Thomas Zeume},
  publisher =	{Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{http://drops.dagstuhl.de/opus/volltexte/2016/5782},
  URN =		{urn:nbn:de:0030-drops-57829},
  doi =		{10.4230/LIPIcs.ICDT.2016.13},
  annote =	{Keywords: Streaming Algorithms, XML Documents, Data Partitioning, Communication Complexity}
}

Keywords: Streaming Algorithms, XML Documents, Data Partitioning, Communication Complexity
Seminar: 19th International Conference on Database Theory (ICDT 2016)
Issue Date: 2016
Date of publication: 29.02.2016


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