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The rise of the Internet and the multiplication of data sources have multiplied the number of "Bigdata" storage problems. These data sets are not only very big but also tend to grow very fast, sometimes in a short period. Distributed databases that work well for such data sets need to be not only scalable but also elastic to ensure a fast response to growth in demand of computing power or storage. The goal of this paper is to present measurement results that characterize the elasticity of three databases. The authors have chosen Cassandra, HBase, and mongoDB as three representative popular horizontally scalable NoSQL databases that are in production use.
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