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by Bruno Codenotti, Gianluca De Marco, Via G. Moruzzi, Manuela Montangero
http://people.cs.uchicago.edu/~codenott/www2003last.pdf
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Abstract:
We consider a problem arising in the efficient management of a Hierarchical Document Space, i.e., partitioning the leaves of a tree among a set of servers in a such a way that it is possible to take full advantage of the hierarchical system to efficiently answer user’s queries. After proving that the problem is NP-Hard, we devise efficient approximate solutions, and we make a number of experiments which show that allowing for very little space inefficiency can be instrumental to achieving a significant improvement in the query efficiency.
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