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Algorithms for Maintaining Consistency of Cached Data for Mobile Clients in Distributed File System

机译:分布式文件系统中移动客户端的缓存数据一致性维护算法

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摘要

A cache stores data in order to serve future requests to those data faster. In mobile devices, the data have to be transferred from a server through the mobile network before being stored in the cache. The mobile network is prone to failure caused by users' movements and by the placement of base transceiver stations. Moreover, the mobile devices use various telecommunications technologies and therefore the speed of the network is highly variable. Using a cellular network for communication is also expensive. The cache is an intermediate component which addresses this problem. Once the data are downloaded, they can be stored in the cache for possible future reuse. When using a cache, the system designer presumes that the data will be requested again in the future. On the other hand, the original data stored on the server can be changed. Then, the cached data are in an inconsistent state. In this paper, authors present an adaptive method for maintaining the consistency of cached data which saves network traffic by reducing the number of messages needed for inconsistency detection.
机译:高速缓存存储数据,以便更快地为这些数据提供将来的请求。在移动设备中,必须先通过移动网络从服务器传输数据,然后再将其存储在缓存中。由于用户的移动以及基站收发器的放置,移动网络容易出现故障。此外,移动设备使用各种电信技术,因此网络速度是高度可变的。使用蜂窝网络进行通信也是昂贵的。缓存是解决此问题的中间组件。数据下载后,可以将其存储在缓存中,以备将来重用。使用高速缓存时,系统设计人员假定将来会再次请求数据。另一方面,可以更改存储在服务器上的原始数据。然后,缓存的数据处于不一致状态。在本文中,作者提出了一种用于保持缓存数据一致性的自适应方法,该方法通过减少不一致检测所需的消息数量来节省网络流量。

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