Richard E. Schantz

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CORBA is a commercial standard for distributed object computing which shows great promise in the development of distributed programs. Its interface description language (IDL) enables objects to be developed independently of the underlying programming language, operating system, or computer architecture on which they will execute. While this is su cient in(More)
In this paper we discuss the use of the MapReduce software framework to address the challenge of constructing high-performance, massively-scalable distributed systems. We discuss several design considerations associated with constructing complex distributed systems using the MapReduce software framework, including the difficulty of scalably building(More)
Building dependable distributed systems from commercial off-the-shelf components is of growing practical importance. For both cost and production reasons, there is interest in approaches and architectures that facilitate building such systems. The AQuA architecture is one such approach; its goal is to provide adaptive fault tolerance to CORBA applications(More)
Middleware technologies allow the development of distributed applications without explicit knowledge of the networking involved. However, in the face of changing network and CPU conditions across the distributed system, these applications often will need to adapt their behavior to maintain an acceptable quality of service (QoS), which implies a knowledge of(More)
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Two limitations of the current implementations of adaptive QoS behaviors are complexity associated with inserting them into common application contexts and lack of reusability across applications. What is needed is a way of bundling all the specification for systemic behavior into one place, and making it feasible to insert the collection of related QoS(More)
Graph data processing is an emerging application area for cloud computing because there are few other information infrastructures that cost-effectively permit scalable graph data processing. We present a scalable cloud-based approach to process queries on graph data utilizing the MapReduce model. We call this approach the Clause-Iteration approach. We(More)
Two fundamental trends influence the way we conceive and construct new computing and information systems. The first is that information technology of all forms is becoming highly commoditized i.e., hardware and software artifacts are getting faster, cheaper, and better at a relatively predictable rate. The second is the growing acceptance of a(More)
Distributed object middleware, such as CORBA, hides systemand network-speci c characteristics of objects behind functional interface speci cations. This simpli es development and maintenance of distributed objects, contributing to their growing acceptance. Critical applications have Quality of Service (QoS) requirements, however, such as real-time(More)
The Quality Objects (QuO) middleware is a set of extensions to standard distributed object computing middleware that is used to control and adapt quality of service in a number of distributed application environments, from wide-area to embedded distributed applications. This paper compares and contrasts the characteristics of key use cases and the(More)