Toward Dependency-Agnostic Online Upgrades in Distributed Systems

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• Tudor Dumitras, Carnegie Mellon University
• Friday 29 June 2007, 14:00-15:00
• Lecture Theatre 2, Computer Laboratory, William Gates Builiding.

If you have a question about this talk, please contact Wenjun Hu.

Please note the unusual time and day

Traditional approaches for online upgrades of distributed systems rely on dependency tracking to preserve system integrity during and after the upgrade. Because dependency reification can become intractable, we aim to enforce the isolation of the old and new versions during the upgrade. We achieve this by installing the new version in a “parallel universe” – a separate physical or virtual infrastructure that does not communicate directly with the old version. This allows our upgrading middleware to treat the complex IT infrastructure as a black box with unknown hidden dependencies, and to validate the upgrade by crosschecking the outputs of the two universes.

This talk is part of the Computer Laboratory Systems Research Group Seminar series.

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