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Optimizing Flash-based Key-value Cache Systems

Authors: 

Zhaoyan Shen, Hong Kong Polytechnic University; Feng Chen and Yichen Jia, Louisiana State University; Zili Shao, Hong Kong Polytechnic University

Abstract: 

Flash-based key-value cache systems, such as Facebook’s McDipper [1] and Twitter’s Fatcache [2], provide a cost-efficient solution for high-speed key-value caching. These cache solutions typically take commercial SSDs and adopt a Memcached-like scheme to store and manage key-value pairs in flash. Such a practice, though simple, is inefficient. We advocate to reconsider the hardware/software architecture design by directly opening device-level details to key-value cache systems. This co-design approach can effectively bridge the semantic gap and closely connect the two layers together. Leveraging the domain knowledge of key-value caches and the unique device-level properties, we can maximize the efficiency of a key-value cache system on flash devices while minimizing its weakness. We are implementing a prototype based on the Open-channel SSD hardware platform. Our preliminary experiments show very promising results.

Zhaoyan Shen, Hong Kong Polytechnic University

Feng Chen, Louisiana State University

Yichen Jia, Louisiana State University

Zili Shao, Hong Kong Polytechnic University

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BibTeX
@inproceedings {196388,
author = {Zhaoyan Shen and Feng Chen and Yichen Jia and Zili Shao},
title = {Optimizing Flash-based Key-value Cache Systems},
booktitle = {8th USENIX Workshop on Hot Topics in Storage and File Systems (HotStorage 16)},
year = {2016},
address = {Denver, CO},
url = {https://www.usenix.org/conference/hotstorage16/workshop-program/presentation/shen},
publisher = {USENIX Association},
month = jun,
}
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