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Title: Optimizing content retrieval delay for LT-based distributed cloud storage systems
Authors: Cai, Jianfei
Lu, Haifeng
Foh, Chuan Heng
Wen, Yonggang
Keywords: DRNTU::Engineering::Computer science and engineering
Issue Date: 2012
Source: Lu, H., Foh, C. H., Wen, Y., & Cai, J. (2012). Optimizing content retrieval delay for LT-based distributed cloud storage systems. 2012 IEEE Global Communications Conference (GLOBECOM), 1920-1925.
Abstract: 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, we show that multiple-stage retrieval of fragments is effective to reduce the content-retrieval delay. We first develop a delay model for various multiple-stage retrieval schemes applicable to our considered system. With the developed model, we study optimal retrieval schemes given the success decodability requirement. Our numerical results demonstrate that the content-retrieval delay can be significantly reduced by optimally scheduling packet requests in a multi-stage fashion.
DOI: 10.1109/GLOCOM.2012.6503396
Rights: © 2012 IEEE.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SCSE Conference Papers

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