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Software-Defined Networking (SDN) is a networking paradigm that decouples the control plane of a network from its forwarding plane and offers programmability of the data plane devices to manage and control the ongoing traffic flows. This paper presents the control plane architecture of a data center network (DCN) and its operational services being developed for NEPHELEs optical network infrastructure...
Workflow is a well-established means by which to capture scientific methods in an abstract graph of interrelated processing tasks. The reproducibility of scientific workflows is therefore fundamental to reproducible e-Science. However, the ability to record all the required details so as to make a workflow fully reproducible is a long-standing problem that is very difficult to solve. In this paper,...
In the context of Hadoop, recent studies show that the shuffle operation accounts for as much as a third of the completion time of a MapReduce job. Consequently, the shuffle phase constitutes a crucial aspect of the scheduling of such jobs. During a shuffle phase, the job scheduler assigns reduce tasks to a set of reduce nodes. This may require multiple intermediate data items which share a key to...
Though current workflow systems, known as the major task managing tool in data-center, use UNIX-based user/group authorization mechanisms to defend unauthorized operations, the information in workflow systems, such as DAG (Directed Acyclic Graph), could be easily exposed to any user-level malicious monitor. In this paper, we propose a type of side channel attack to data-center workflow information...
As the sector of SaaS is being evolved, the need of portability and effective orchestration of Cloud-enabled applications over virtualised infrastructures is more apparent. In this paper we present a proof of concept (PoC) project together with industry partners which deals with the management of portable Cloud applications. Experimentation with a multi-tier Cloud application use case gives insights...
This paper presents the concept of Open Cloud eXchange (OCX) that has been proposed to bridge the gap between two major components of the cloud services provisioning infrastructure: Cloud Service Provider (CSP) infrastructure, and cloud services delivery infrastructure which in many cases requires dedicated local infrastructure and quality of services that cannot be delivered by the public Internet...
The ongoing trend towards a global services economy creates considerable market opportunities for various stakeholders. A service intermediary who offers complex services to customers and consumes services from suppliers and thus creates a service value network, faces the challenge of adhering to agreed service levels while minimizing associated costs, risks and potential penalties. Starting from...
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