Static scheduling algorithms for allocating directed task graphs to multiprocessors
ACM Computing Surveys (CSUR)
Journal of Parallel and Distributed Computing
Distributed and Parallel Databases
GridFlow: Workflow Management for Grid Computing
CCGRID '03 Proceedings of the 3st International Symposium on Cluster Computing and the Grid
Optimization Techniques for Data-Intensive Decision Flows
ICDE '00 Proceedings of the 16th International Conference on Data Engineering
Exchanging intensional XML data
Proceedings of the 2003 ACM SIGMOD international conference on Management of data
Dynamic XML documents with distribution and replication
Proceedings of the 2003 ACM SIGMOD international conference on Management of data
Lazy query evaluation for Active XML
SIGMOD '04 Proceedings of the 2004 ACM SIGMOD international conference on Management of data
Resource Scheduling for Parallel Query Processing on Computational Grids
GRID '04 Proceedings of the 5th IEEE/ACM International Workshop on Grid Computing
Facilitating the rapid development and scalable orchestration of composite web services
Distributed and Parallel Databases
Scheduling of scientific workflows in the ASKALON grid environment
ACM SIGMOD Record
Hierarchical submission in a Grid environment
MGC '05 Proceedings of the 3rd international workshop on Middleware for grid computing
Task scheduling strategies for workflow-based applications in grids
CCGRID '05 Proceedings of the Fifth IEEE International Symposium on Cluster Computing and the Grid (CCGrid'05) - Volume 2 - Volume 02
An opportunistic algorithm for scheduling workflows on grids
VECPAR'06 Proceedings of the 7th international conference on High performance computing for computational science
A framework for distributed XML data management
EDBT'06 Proceedings of the 10th international conference on Advances in Database Technology
Complex data integration into an active XML repository
Proceedings of the International Conference on Management of Emergent Digital EcoSystems
ARAXA: Storing and managing Active XML documents
Web Semantics: Science, Services and Agents on the World Wide Web
Active XML (AXML) intensional data exchange
Proceedings of the 13th International Conference on Information Integration and Web-based Applications and Services
On the improvement of active XML (AXML) representation and query evaluation
Information Systems Frontiers
Active XML-based Web data integration
Information Systems Frontiers
Journal of Network and Computer Applications
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An active XML (AXML) document contains tags representing calls to Web services. Therefore, retrieving its contents consists in materializing its data elements by invoking the embedded service calls in a P2P network. In this process, the result of some service calls can be used as input of other calls. Also, usually several peers provide each requested Web service, and peers can collaborate to invoke these services. This often implies a huge search space of many equivalent materialization alternatives, each with different performance. In this paper, we model AXML documents from a workflow perspective and propose a dynamic cost-based optimization strategy to efficiently materialize them, considering the volatility of a typical P2P scenario. Our strategy enables the optimizer, called XCraft, to get more up-to-date information on the status of the peers, and to deliver partial results earlier. Based on a service-oriented algebra of plan operators, we exploit P2P collaboration to delegate both execution and optimization control. Our tests with an XCraft prototype show important performance gains w.r.t. a centralized approach, whilst the optimizer also achieved to drastically reduce the size of the search space.