Separating Web Applications from User Data Storage with BSTORE

摘要

This paper presents BSTORE, a framework that allows developersto separate their web application code from userdata storage. With BSTORE, storage providers implementa standard file system API, and applications access userdata through that same API without having to worry aboutwhere the data might be stored. A file system managerallows the user and applications to combine multiple filesystems into a single namespace, and to control what dataeach application can access. One key idea in BSTORE’sdesign is the use of tags on files, which allows applicationsboth to organize data in different ways, and todelegate fine-grained access to other applications. Wehave implemented a prototype of BSTORE in Javascriptthat runs in unmodified Firefox and Chrome browsers.We also implemented three file systems and ported threedifferent applications to BSTORE. Our prototype incursan acceptable performance overhead of less than 5% on a10Mbps network connection, and porting existing clientsideapplications to BSTORE required small amounts ofsource code changes.