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Workflows are widely used in data-intensive applications since it facilities the composition of individual executables or scripts, providing an easy-to-use parallelization to domain experts. With considerable popularity of MapReduce framework, some researchers start to develop MapReduce-enabled workflows instead of general file-based ones. Meanwhile, being commercially available for nearly two decades...
This paper proposes extensions to parallel database systems called collective queries and User-Defined eXecutables (UDX). A collective query is an SQL query whose results are distributed to multiple clients and then processed by them in parallel, using arbitrary external programs (user-defined executables). The intended applications are data intensive work-flows, typically built out of various independently...
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