CrystalBall: predicting and preventing inconsistencies in deployed distributed systems

  • Authors:
  • Maysam Yabandeh;Nikola Knezevic;Dejan Kostic;Viktor Kuncak

  • Affiliations:
  • School of Computer and Communication Sciences, EPFL, Switzerland;School of Computer and Communication Sciences, EPFL, Switzerland;School of Computer and Communication Sciences, EPFL, Switzerland;School of Computer and Communication Sciences, EPFL, Switzerland

  • Venue:
  • NSDI'09 Proceedings of the 6th USENIX symposium on Networked systems design and implementation
  • Year:
  • 2009

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Abstract

We propose a new approach for developing and deploying distributed systems, in which nodes predict distributed consequences of their actions, and use this information to detect and avoid errors. Each node continuously runs a state exploration algorithm on a recent consistent snapshot of its neighborhood and predicts possible future violations of specified safety properties. We describe a new state exploration algorithm, consequence prediction, which explores causally related chains of events that lead to property violation. This paper describes the design and implementation of this approach, termed CrystalBall. We evaluate CrystalBall on RandTree, BulletPrime, Paxos, and Chord distributed system implementations. We identified new bugs in mature Mace implementations of three systems. Furthermore, we show that if the bug is not corrected during system development, CrystalBall is effective in steering the execution away from inconsistent states at runtime.