Abstract. The BIS-Grid project, as part of the German D-Grid initiative, investigates service orchestration using Grid service technologies to show how such technologies can be employed for information systems integration, especially when crossing enterprise boundaries. Small and medium enterprises will be enabled to integrate heterogeneous business information systems and to use external resources and services with affordable effort.In this paper, we discuss our Orchestration as a Service (OaaS) paradigm and present the BIS-Grid OaaS infrastructure. This infrastructure is based upon service extensions to the Grid middleware UNI-CORE 6 to use an arbitrary WS-BPEL workflow engine and standard WS-BPEL to orchestrate both plain Web services and stateful, WSRFbased Grid services. We report on the evaluation scenarios at our industrial application partners and on the applied service modeling methodology.
Many structured Peer-to-Peer-Systems (P2P) have been developed over the past years. However, most of them rely on hash-functions and thus put major restrictions on applications being implemented on top of them. In this paper we present a very detailed description of Papnet, a hash-free P2P overlaynetwork that supports range-queries and realizes an infinite alphanumeric address space that can be used to store arbitrarily skewed data. We show how Papnet is able to distribute load amongst its nodes using the Ganesan On-Line Load Balancing providing a constant imbalance ratio while still being able to perform proximity routing, reaching each participating node with a latency being only roughly twice the direct latency. Further, we introduce a join-algorithm that provides Papnet with high faulttolerance properties. We evaluated Papnet in a real distributed environment by setting up a network consisting of 50,000 nodes.
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