MobileRE: A Hybrid Fault Tolerance Strategy Combining Erasure Codes and Replicas for Mobile Distributed Cluster

Abstract

Fault tolerance techniques are of vital importance to promise data storage reliability for mobile distributed file systems. Traditional fault tolerance techniques, namely erasure codes and replicas, are suitable for wired data centers. However, they face challenges in mobile distributed environment, where nodes suffer from high failure probability and fluctuating bandwidth.In this paper, we present a hybrid fault tolerance strategy combining erasure codes and replicas for the mobile distributed cluster (MobileRE), to improve data reliability with dynamic network status. In MobileRE, we first formulate a reliability cost rate to indicate the cost of ensuring data reliability of the mobile cluster. MobileRE further adaptively applies the erasure codes and replicas algorithms based on real-time network bandwidth status to minimize system reliability cost rate. Simulation results show that compared with traditional designs that only adopt erasure codes or replicas, MobileRE can significantly reduce the system reliability cost rate.