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Companson and Diagnosis of Large Replicated Files

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3 Author(s)
Fuchs, W.K. ; Compiler Systems Group, Coordinated Science Laboratory, University of Illinois at Urbana-Champaign ; Kun-Lung Wu ; Abraham, J.A.

This paper examines the problem of comparing large replicated files in a context in which communication dominates the cost of comparison. A low-cost checking matrix is proposed for comparison of these replicated files. The checking matrix is composed of check symbols generated by a divide-and-conquer encoding algorithm. The matrix allows for detection and diagnosis of disagreeing pages with very little communication overhead. In contrast to a previous O(N) proposal, the storage requirement for the checking matrix is O(log N), where N is the number of pages in the file. The matrix can be stored in main memory without the need for extra accesses to disk during normal updates of pages.

Published in:

Software Engineering, IEEE Transactions on  (Volume:SE-13 ,  Issue: 1 )

Date of Publication:

Jan. 1987

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