The conference will take place from June 20 - 25, 2021 in Xi'an, China. This work is the result of a collaboration between researchers from the Database Systems and Information Management (DIMA) group at TU Berlin, the Intelligent Analytics for Massive Data (IAM) group at DFKI, the Department of Computer Science at the National University of Singapore (NUS) and ByteDance.
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Abstract
The intra-window join (IaWJ), i.e., joining two input streams over a single window, is a core operation in modern stream processing applications. This paper presents the first comprehensive study on parallelizing the IaWJ on modern multicore architectures. In particular, we classify IaWJ algorithms into lazy and eager execution approaches. For each approach, there are further design aspects to consider, including different join methods and partitioning schemes, leading to a large design space. Our results show that none of the algorithms always performs the best, and the choice of the most performant algorithm depends on: (i) workload characteristics, (ii) application requirements, and (iii) hardware architectures. Based on the evaluation results, we propose a decision tree that can guide the selection of an appropriate algorithm.
A preprint version of the paper is available for download.