THE ADVANCED COMPUTING SYSTEMS ASSOCIATION The following paper was originally published in the Proceedings of the USENIX Annual Technical Conference Monterey, California, USA, June 6-11, 1999 Operation-based Update Propagation in a Mobile File System _ Yui-Wah Lee, Kwong-Sak Leung The Chinese University of Hong Kong Mahadev Satyanarayanan Carnegie Mellon University © 1999 by The USENIX Association All Rights Reserved Rights to individual papers remain with the author or the author's employer. Permission is granted for noncommercial reproduction of the work for educational or research purposes. This copyright notice must be included in the reproduced paper. USENIX acknowledges all trademarks herein. For more information about the USENIX Association: Phone: 1 510 528 8649 FAX: 1 510 548 5738 Email:
[email protected] WWW: http://www.usenix.org Operation-based Update Propagation in a Mobile File System Yui-Wah Lee Kwong-Sak Leung The Chinese University of Hong Kong g fclement,ksleung @cse.cuhk.edu.hk Mahadev Satyanarayanan Carnegie Mellon University
[email protected] Abstract and in reducing the likelihood of update conflicts. In this paper we describe a technique called operation- Propagation of updates from a mobile client is often based update propagationfor efficiently transmitting up- impeded by weak connectivity in the form of wireless dates to large files that have been modified on a weakly or wired networks that are low-bandwidth or intermit- connected client of a distributed file system. In this tech- tent. Aggressive update propagation under these condi- nique, modifications are captured above the file-system tions increases the demand on scarce bandwidth.