| Abstract
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Several recent cloud-backed storage system … Several recent cloud-backed storage systems advocates the
composition of a number of cloud services for improving
performance and fault tolerance (e.g., [1, 3, 4]). An interesting
aspect of these compositions is that the consistency
guarantees they provide depend on the consistency of such
base services, which are normally different.
In this short paper we discuss two ways in which these
services can be composed and the implications in terms
of the consistency of the composed object. Although these
techniques were devised (or observed) when solving practical
problems in dealing with the eventual consistency
guarantees of current cloud storage services (e.g., Amazon
S3 [6], Windows Azure Blob Storage [7]), we believe they
might be of general interest, and deserve the attention of the
community. In particular, we want to discuss some initial
ideas about the theoretical underpinnings of object compositions
in which base objects provide different consistency
guarantees. provide different consistency
guarantees.
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