Consistent detection of global predicates
PADD '91 Proceedings of the 1991 ACM/ONR workshop on Parallel and distributed debugging
Distributed snapshots: determining global states of distributed systems
ACM Transactions on Computer Systems (TOCS)
Detection of Strong Unstable Predicates in Distributed Programs
IEEE Transactions on Parallel and Distributed Systems
Time, clocks, and the ordering of events in a distributed system
Communications of the ACM
Hierarchical Detection of Strongly Consistent Global States
ISPDC '04 Proceedings of the Third International Symposium on Parallel and Distributed Computing/Third International Workshop on Algorithms, Models and Tools for Parallel Computing on Heterogeneous Networks
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The most promising feature of the Web services platform is its ability to form new services by combining the capabilities of already existing services, i.e., its composability. The existing services may themselves be composed of other services, leading to a hierarchical composition. In this work, we focus on the monitoring aspect for hierarchical Web services compositions. We are primarily interested in capturing the state of a hierarchical composition at any given point of time (snapshot). We discuss in detail how some of the snapshot algorithms proposed in literature can be extended in a Web services context. Snapshots usually reflect a state of the system which “might have occurred”. Towards this end, we show how we can acquire a state that “actually occurred” from such snapshots. Finally, we discuss the different types of execution related queries and how we can answer them using the captured snapshots.