Gloria: Graph-based Sharing Optimizer for Event Trend Aggregation

Gloria: Graph-based Sharing Optimizer for Event Trend Aggregation
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Gloria:基于图的事件趋势聚合共享优化器

DOI:
10.1145/3514221.3526145
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发表时间:
2022
期刊:
SIGMOD '22: Proceedings of the 2022 International Conference on Management of Data
影响因子:
--
通讯作者:
Rundensteiner, Elke A.
Rundensteiner, Elke A.
中科院分区:
--
文献类型:
--
作者:
Ma, Lei;Lei, Chuan;Poppe, Olga;Rundensteiner, Elke A.

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广泛部署事件趋势聚合查询的大工作负载,以近真实的时间获得关于当前事件趋势的高级见解。为了加快执行速度,我们从具有平面Kleene运算符甚至嵌套Kleene表达式的复杂模式中识别并利用共享机会。我们提出了格洛丽亚,一个基于图的事件趋势聚合共享优化器。首先,我们将共享优化问题映射到格洛丽亚图中的图路径搜索问题,执行成本编码为权重。其次,我们缩小搜索空间,通过应用成本驱动的修剪原则,保证最优的减少格洛丽亚图在大多数情况下。最后,我们提出了一个路径搜索算法,以确定最小的执行成本的共享计划。我们对三个真实数据集的实验研究表明,我们的格洛丽亚优化器有效地减少了搜索空间,导致优化时间的5倍加速。与最先进的方法生成的计划相比,优化的计划始终将查询延迟降低了68%-93%。
Large workloads of event trend aggregation queries are widely deployed to derive high-level insights about current event trends in near real time. To speed-up the execution, we identify and leverage sharing opportunities from complex patterns with flat Kleene operators or even nested Kleene expressions. We propose Gloria, a graph-based sharing optimizer for event trend aggregation. First, we map the sharing optimization problem to a graph path search problem in the Gloria graph with execution costs encoded as weights. Second, we shrink the search space by applying cost-driven pruning principles that guarantee optimality of the reduced Gloria graph in most cases. Lastly, we propose a path search algorithm that identifies the sharing plan with minimum execution costs. Our experimental study on three real-world data sets demonstrates that our Gloria optimizer effectively reduces the search space, leading to 5-fold speed-up in optimization time. The optimized plan consistently reduces the query latency by 68%-93% compared to the plan generated by state-of-the-art approaches.
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