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As more and more multi-tier services are developed from commercial components or heterogeneous middleware without the source code available, both developers and administrators need a precise request tracing tool to help understand and debug performance problems of large concurrent services of black boxes. Previous work fails to resolve this issue in several ways: they either accept the imprecision of probabilistic correlation methods, or rely on knowledge of protocols to isolate requests indoi:10.1109/dsn.2009.5270321 dblp:conf/dsn/ZhangZLWMS09 fatcat:esmzd4le6bbzzdwattbwqawmrm