9th Workshop on Hot Topics in Operating Systems (HotOS IX) Abstract
Scheduling and Simulation: How to Upgrade Distributed Systems
Sameer Ajmani and Barbara Liskov, Massachusetts Institute of Technology;
Liuba Shrira, Brandeis University
Upgrading the software of long-lived distributed systems is difficult. It is not possible to upgrade all the nodes in a system at once, since some nodes may be down, and halting the system for an upgrade is unacceptable. This means that different nodes may be running different software versions and yet need to communicate, even though those versions may not be fully compatible. We present a methodology and infrastructure that addresses these challenges and makes it possible to upgrade distributed systems automatically while limiting service disruption.
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