This article discusses problems and decisions related to scheduling of stream processing applications in heterogeneous clusters. An overview of the current state of the art of the stream processing on heterogeneous clusters with a focus on resource allocation and scheduling is presented first. Then, common scheduling approaches of various stream processing frameworks are discussed and their limited applicability in the heterogeneous environment is demonstrated on a simple stream application. Finally, the article presents a novel heterogeneity-aware scheduler for the stream processing frameworks based on design-time knowledge as well as benchmarking techniques. It is shown that the scheduler overcomes alternatives in resource-aware deployment over cluster nodes and thus it leads to a better utilisation of the clusters.
Abstract. This paper deals with the Featured Driven Development (FDD), an agile software development method. According to the requirement analysis for the FDD method application, an information system has been created providing all team members with instruments to follow the method. This tool has been implemented as a multi-user web-based application enabling creation of feature lists, planning a project, supporting cooperation among members of a feature-team, and tracking project progress in an illustrative way. To support project management and communication with customer representatives, a wide range of reporting features has been provided.
Recently, web-services have become a popular technology for implementing information systems as serviceoriented applications. The service orientation allows to decompose complex software systems into collections of cooperating and autonomous components which communicate asynchronously via messages of appropriate formats. Nevertheless, the assurance of reliability and robustness of these systems is becoming more and more complicated matter. For this reason, the new testing methods such as fault injection and specialised tools for automated validation of web-services appear. This paper discusses the design, implementation, and evaluation of a tool for software implemented fault injection into web-services. This tool allows to monitor and to test the most common types of web-services according to given setup criteria.
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