Erasure codes with symbol locality and group decodability for distributed storage
| Autor: | Chau Yuen, Wentu Song, Son Hoang Dau |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | ITW Fall |
| DOI: | 10.1109/itwf.2015.7360737 |
| Popis: | We introduce a new family of erasure codes, called group decodable code (GDC), for distributed storage system. Given a set of design parameters {\alpha; \beta; k; t}, where k is the number of information symbols, each codeword of an (\alpha; \beta; k; t)-group decodable code is a t-tuple of strings, called buckets, such that each bucket is a string of \beta symbols that is a codeword of a [\beta; \alpha] MDS code (which is encoded from \alpha information symbols). Such codes have the following two properties: (P1) Locally Repairable: Each code symbol has locality (\alpha; \beta-\alpha + 1). (P2) Group decodable: From each bucket we can decode \alpha information symbols. We establish an upper bound of the minimum distance of (\alpha; \beta; k; t)-group decodable code for any given set of {\alpha; \beta; k; t}; We also prove that the bound is achievable when the coding field F has size |F| > n-1 \choose k-1. Comment: 9 pages |
| Databáze: | OpenAIRE |
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