Cloud

Optimizing Content Retrieval Delay for LT-Based Distributed Cloud Storage Systems

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Executive Summary

Among different setups of cloud storage systems, fountain-codes based distributed cloud storage system provides reliable online storage solution through placing coded content fragments into multiple storage nodes. Luby Transform (LT) code is one of the popular fountain codes for storage systems due to its efficient recovery. However, to ensure high success decoding of fountain codes based storage, retrieval of additional fragments is required, and this requirement introduces additional delay, which is critical for content retrieval or downloading applications. In this paper, the authors show that multiple-stage retrieval of fragments is effective to reduce the content-retrieval delay.

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