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Even though software systems in some domains are expected to provide continuous services, most of them must undergo some form of changes. It leads to the emergence of dynamic software updating, a technique for updating a running software system without incurring any downtime. One of the challenges of designing a correct dynamic update is to identify a set of update points where the update can be safely...
Chandy and Lamport have proposed a distributed snapshot algorithm (called CLDSA). One desired property of CLDSA is as follows. Let s1 be the state in which CLDSA initiates, s2 be the state in which CLDSA terminates, and s* be the snapshot taken, and then s* is reachable from s1 and s2 is reachable from s*. The property is called the distributed snapshot reachability (DSR) property. We give a more...
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