We analyze Hadoop workloads from three different research clusters from an application-level perspective, with two goals: (1) explore new issues in application patterns and user behavior and (2) understand key performance chal- lenges related to IO and load balance. Our analysis sug- gests that Hadoop usage is still in its adolescence. We see underuse of Hadoop features, extensions, and tools as well as significant opportunities for optimization. We see signif- icant diversity in application styles, including some "inter- active" workloads, motivating new tools in the ecosystem. We find that some conventional approaches to improving performance are not especially effective and suggest some alternatives. Overall, we find significant opportunity for simplifying the use and optimization of Hadoop, and make recommendations for future research.
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