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- W2990172632 abstract "We consider the problem of multiple-node repair in distributed storage systems under the cooperative model, where the repair bandwidth includes the amount of data exchanged between any two different storage nodes. Recently, explicit constructions of MDS codes with optimal cooperative repair bandwidth for all possible parameters were given by Ye and Barg (IEEE Transactions on Information Theory, 2019). The node size (or sub-packetization) in this construction scales as $exp(Theta(n^h))$, where $h$ is the number of failed nodes and $n$ is the code length. In this paper, we give new explicit constructions of optimal MDS codes for all possible parameters under the cooperative model, and the node size of our new constructions only scales as $exp(O(n))$ for any number of failed nodes. Furthermore, it is known that any optimal MDS code under the cooperative model (including, in particular, our new code construction) also achieves optimal repair bandwidth under the centralized model, where the amount of data exchanged between failed nodes is not included in the repair bandwidth. We further show that the node size of our new construction is also much smaller than that of the best known MDS code constructions for the centralized model." @default.
- W2990172632 created "2019-12-05" @default.
- W2990172632 creator A5061537073 @default.
- W2990172632 date "2019-11-27" @default.
- W2990172632 modified "2023-09-27" @default.
- W2990172632 title "New constructions of cooperative MSR codes: Reducing node size to $exp(O(n))$" @default.
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- W2990172632 doi "https://doi.org/10.48550/arxiv.1911.12525" @default.
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