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2007
IEEE

Window-Oblivious Join: A Data-Driven Memory Management Scheme for Stream Join

10 years 1 months ago
Window-Oblivious Join: A Data-Driven Memory Management Scheme for Stream Join
Memory management is a critical issue in stream processing involving stateful operators such as join. Traditionally, the memory requirement for a stream join is query-driven: a query has to explicitly define a window for each (potentially unbounded) input. The window essentially bounds the size of the buffer allocated for that stream. However, outputs produced by such approach may not be desirable (if the window size is not part of the intended query semantic) due to the volatile input characteristics. We discover that when streams are ordered or partially ordered, it is possible to use a data-driven memory management scheme for improved performance. In this work, we present a novel data-driven memory management scheme, called Window-Oblivious Join (WO-Join), which adaptively adjusts the state buffer size according to the input characteristics. Our performance study shows that, compared to traditional Window-Join (W-Join), WO-Join is more robust with respect to the dynamic inputs and...
Ji Wu, Kian-Lee Tan, Yongluan Zhou
Added 04 Jun 2010
Updated 04 Jun 2010
Type Conference
Year 2007
Where SSDBM
Authors Ji Wu, Kian-Lee Tan, Yongluan Zhou
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