Web applications store their data at the server. Despite several benefits, this design raises a serious problem because
a bug or misconfiguration causing data loss or corruption can affect a large number of users. We describe the design of a generic recovery system for web applications. Our system tracks application requests and reuses undo logs already kept by databases to selectively recover from corrupting requests and their effects. The main challenge is to correlate requests across the multiple tiers of the application to determine the correct recovery actions. We explore using dependencies both within and across requests at three layers, (i.e., database, application, client) to help identify data corruption accurately. We evaluate our system using known bugs and misconfigurations in popular web applications, including Wordpress, Drupal and Gallery2. Our results show that our system enables recovery from data corruption without loss of critical data incurring little overhead while tracking requests.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:OTU.1807/18132 |
| Date | 14 December 2009 |
| Creators | Akkus, Istemi Ekin |
| Contributors | Goel, Ashvin |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
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