分布式文件系统副本一致性检测研究

在大规模分布式文件系统中,副本一致性的实现既需要一致性协议模型的保障,也需要系统能够及时检测出已产生的不一致并予以修复.这里主要研究副本一致性的在线检测技术,全面分析了基于对象存储的大规模分布式文件系统中副本不一致的所有可能情况,深入阐述了在线一致性检测所面临的3个关键问题,即如何减小检测过程对系统性能的影响、保证检测的及时性、以及保证检测的准确性.针对这3个关键问题,总结提出了相应的解决方法.其中,模拟存储状态的方法,减轻了检测过程给系统带来的负荷;预检测的方法,增强了检测出系统不一致错误的及时性;检测静态数据的方法,有效避免了误检和漏检,保证了在线检测的准确性.

Replica Consistency Detection in Distributed File System

In large-scale distributed file systems, replica consistency control not only requires consistency protocols, but also needs to detect and repair inconsistencies in time. This paper focuses on the on-line detection of replica consistency. We discuss almost all inconsistency problems in object-based large-scale distributed file system. Then we elaborate three key issues of on-line consistency detection, that is, how to decrease the detection influence on system performance, ensure detection timeliness and accuracy. According to the three key issues, we present relevant solutions. Simulation of store status reduces the detection load to the system; Pre-detection enables the system to detect inconsistencies timely; Detection of static data can effectively avoid false detection and ensure the accuracy of detection.