Multi-version coding with side information

RE Ali, VR Cadambe, J Llorca… - 2018 IEEE International …, 2018 - ieeexplore.ieee.org
2018 IEEE International Symposium on Information Theory (ISIT), 2018ieeexplore.ieee.org
In applications of storage systems to modern key-value stores, the stored data is highly
dynamic due to frequent updates from the system write clients. The multi-version coding
problem has been formulated to study the cost of storing dynamic data in asynchronous
distributed storage systems. In this problem, previous work considered a completely
decentralized system where a server is not aware of which versions of the data are received
by the other servers. In this paper, we relax this assumption and study a system where a …
In applications of storage systems to modern key-value stores, the stored data is highly dynamic due to frequent updates from the system write clients. The multi-version coding problem has been formulated to study the cost of storing dynamic data in asynchronous distributed storage systems. In this problem, previous work considered a completely decentralized system where a server is not aware of which versions of the data are received by the other servers. In this paper, we relax this assumption and study a system where a server may acquire side information of the versions propagated to some other servers. In particular, we study a storage system with n servers that store v totally ordered independent versions of a message. Each server receives a subset of these ν versions that defines the state of that server. Assuming that the servers are distributed in a ring, a server is aware of which versions have been received by its h -hop neighbors. If the server is aware of the states of ( n - 2) other servers, we show that this side information can result in a better storage cost as compared with the case where there is no side information. Through an information-theoretic converse, we identify scenarios where, even if the server is aware of the states of ( n -3) /2 other servers, the side information may not help in improving the worst-case storage cost beyond the case where servers have no side information.
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