Necessary and sufficient conditions for consistent global snapshots
Netzer, R.H.B.; Jian Xu
Parallel and Distributed Systems, IEEE Transactions on
Volume 6, Issue 2, Feb 1995 Page(s):165 - 169
Digital Object Identifier   10.1109/71.342127
Summary:Consistent global snapshots are important in many distributed applications. We prove the exact conditions for an arbitrary checkpoint, or a set of checkpoints, to belong to a consistent global snapshot, a previously open problem. To describe the conditions, we introduce a generalization of Lamport's (1978) happened-before relation called a zigzag path

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