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Eddies: Continuously Adaptive Query Processing

Eddies: Continuously Adaptive Query Processing

陈傲天
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we introduce a query processing mechanism called an eddy, which continuously reorders operators in a query plan as it runs. We characterize the moments of symmetry during which pipelined joins can be easily reordered,and the synchronization barriers that require inputs from differen sources to be coordinated. By combining eddies with appropriate join algorithms, we merge the optimization and execution phases of query processing, allowing each tuple to have a flexible ordering of the query operators. This flexibility is controlled by a combination of fluid dynamics and a simple learning algorithm.
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