Quancurrent: A Concurrent Quantiles Sketch

08/19/2022

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by   Shaked Elias-Zada, et al.

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Sketches are a family of streaming algorithms widely used in the world of big data to perform fast, real-time analytics. A popular sketch type is Quantiles, which estimates the data distribution of a large input stream. We present Quancurrent, a highly scalable concurrent Quantiles sketch. Quancurrent's throughput increases linearly with the number of available threads, and with 32 threads, it reaches an update speedup of 12x and a query speedup of 30x over a sequential sketch. Quancurrent allows queries to occur concurrently with updates and achieves an order of magnitude better query freshness than existing scalable solutions.