Wukong: A cloud-oriented file service for mobile Internet devices
Journal of Parallel and Distributed Computing
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Distributed file systems have been extensively studiedin the past, but they are still far from wide acceptanceover heterogeneous network environments. Most traditionalnetwork file systems target the tight-couple high-speednetworks only, and do not work well in the wide-areasetting. Several communication optimization techniquesare proposed in the context of wide-area file systems, butthese approaches do not take into consideration the filecharacteristics and may instead introduce extra computingoverhead when the network condition is good. We envisionthat the capability of providing adaptive, seamlessfile access to personal documents across diverse networkconnections plays an important role in the success of futuredistributed file systems.In this paper, we propose to build an adaptive distributedfile system which provides the "ClosE and Go,Open and Resume" (Cegor) semantics across heterogeneousnetwork connections, ranging from high-bandwidthlocal area network to low-bandwidth dial-up connection.Our approach relies on a set of new techniquesfor managing adaptive access to remote files, includingthree components: system support for secure, transparentreconnection at different places, semantic-view basedcaching to reduce communication frequencies in the system,and type-specific communication optimization tominimize the bandwidth requirement of synchronizationsbetween clients and servers.