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arXiv · 1812.09674

AnchorHash: A Scalable Consistent Hash

Gal Mendelson·Shay Vargaftik·Katherine Barabash·Dean Lorenz·Isaac Keslassy·Ariel Orda
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Abstract

Consistent hashing (CH) is a central building block in many networking applications, from datacenter load-balancing to distributed storage. Unfortunately, state-of-the-art CH solutions cannot ensure full consistency under arbitrary changes and/or cannot scale while maintaining reasonable memory footprints and update times. We present AnchorHash, a scalable and fully-consistent hashing algorithm. AnchorHash achieves high key lookup rates, a low memory footprint, and low update times. We formally establish its strong theoretical guarantees, and present advanced implementations with a memory footprint of only a few bytes per resource. Moreover, extensive evaluations indicate that it outperforms state-of-the-art algorithms, and that it can scale on a single core to 100 million resources while still achieving a key lookup rate of more than 15 million keys per second.

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Gal Mendelson, Shay Vargaftik, Katherine Barabash, Dean Lorenz, Isaac Keslassy, Ariel Orda. 2018-12-23. AnchorHash: A Scalable Consistent Hash. https://arxiv.org/abs/1812.09674

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