Not sure I buy the paper's analysis. They don't seem to know much about load testing -- they speak as though throughput is 'load' (rather than the multiprogramming level) and don't computer Bandwidth - Delay products.
Also, rather than using M/M/1 or some reasonable analytic model, they deliberately trottled their request rates to hold throughput constant (thereby guaranteeing different loadings for different 'benchmarks')
Just reading the first graph, for example, and applying Little's Law, it's pretty evident that Cassandra was loaded more heavily than than the two MySQL systems, with HBASE and Riak trailing.
Looks like HBASE and Cassandra lead the pack to me, with different characterists for different purposes.
Also, rather than using M/M/1 or some reasonable analytic model, they deliberately trottled their request rates to hold throughput constant (thereby guaranteeing different loadings for different 'benchmarks')
Just reading the first graph, for example, and applying Little's Law, it's pretty evident that Cassandra was loaded more heavily than than the two MySQL systems, with HBASE and Riak trailing.
Looks like HBASE and Cassandra lead the pack to me, with different characterists for different purposes.
Advice to authors: buy a book by Neil Gunther.