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SUMMARY:Toward Dependency-Agnostic Online Upgrades in Distributed Systems 
 - Tudor Dumitras\, Carnegie Mellon University
DTSTART:20070629T130000Z
DTEND:20070629T140000Z
UID:TALK7647@talks.cam.ac.uk
CONTACT:Wenjun Hu
DESCRIPTION:Traditional approaches for online upgrades of distributed syst
 ems rely on dependency tracking to preserve system integrity during and af
 ter the upgrade. Because dependency reification can become intractable\, w
 e aim to enforce the isolation of the old and new versions during the upgr
 ade. We achieve this by installing the new version in a “parallel univer
 se” – a separate physical or virtual infrastructure that does not comm
 unicate directly with the old version. This allows our upgrading middlewar
 e to treat the complex IT infrastructure as a black box with unknown hidde
 n dependencies\, and to validate the upgrade by crosschecking the outputs 
 of the two universes.
LOCATION:Lecture Theatre 2\, Computer Laboratory\, William Gates Builiding
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