This paper describes an enhanced replica synchronization mechanism built in Microsoft's WinFS replica management system. The paper introduces a novel bundling mechanisms called VS, which groups together multiple objects and represents their state in a single version-vector. VS provide improved storage and communication overheads over previously known optimistic replication schemes, in the following sense. Under normal, low-fault situations, it maintains and communicates as little as a single version vector in order to represent precedence ordering of the entire set of data objects. Moreover, under settings of severe communication disruptions, VS degenerates to no worse than a single vector per object. This dramatically improves the complexities described in a preliminary write-up of the WinFS replication scheme.
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