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Traditional infrastructure-as-a-service (IaaS) clouds provide virtual machines as servers. However, virtualization incurs a performance overhead and prevents maximum utilization of hardware functions, so several IaaS vendors have started new services called bare-metal clouds that provide physical rather than virtual machines, allowing users to have direct access to physical hardware in the cloud....
Fog computing extends cloud computing to end devices, in order to better support time dependent, location dependent, massive scale, and latency sensitive applications. In this paper, we propose a fog computing ecosystem, implement a real testbed, and evaluate it with diverse usage scenarios. More specifically, we study three usage scenarios and optimize our fog computing platform for them. These usage...
A logical chaining of Virtual Network Functions (VNFs) enables toy-blocking style composition of various network services. VNFs are generally based on Virtual Machines (VMs) running on commodity servers. However, such VM-based VNFs have poor packet forwarding performance because of the virtual network I/O overhead, and therefore virtualization of the core network functions can degrade overall network...
Data-intensive applications usually need to deal with huge volumes of data within their deadlines. These applications can be modelled as DAGs and require parallel computation frameworks such as MapReduce and Spark to enhance the performance. The network communication has a crucial impact on the performance of an application. Coflow is intended to address the application-specific network level Quality-of-Service...
DevOps teams have to consider many technology and platform aspects when developing, deploying and operating cloud based applications: application deployments need to work everywhere on different cloud platforms, identities need to come from anywhere, and networks need to connect to anyone. The CYCLONE middleware is a holistic middleware stack that allows deploying and managing cloud based applications...
The paper presents C2 Platform that covers both the telecommunication and enterprise cloud cases. The C2 architecture incorporates as the network service orchestration as service life-cycle management. C2 implementation follows ETSI NFV MANO standard and uses TOSCA to describe network functions. The paper provides the experiment's methodology and experimental measurements of the platform efficiency,...
Data Science is currently a popular field of science attracting expertise from very diverse backgrounds. Current learning practices need to acknowledge this and adapt to it. This paper summarises some experiences relating to such learning approaches from teaching a postgraduate Data Science module, and draws some learned lessons that are of relevance to others teaching Data Science.
Data Science is an emerging field of science, which requires a multi-disciplinary approach and is based on the Big Data and data intensive technologies that both provide a basis for effective use of the data driven research and economy models. Modern data driven research and industry require new types of specialists that are capable to support all stages of the data lifecycle from data production...
This paper presents the Data Science Model Curriculum (MC-DS) that is based on the Data Science Competence Framework and Data Science Body of Knowledge defined in EDISON Data Science Framework (EDSF). MC-DS follows a competence-based curriculum design approach grounded in the Data Science competences (CD-DS) defined in EDSF and correspondingly defined Learning Outcomes (LO). The DSBoK provides a basis...
In order to be responsible stewards of other people’s data, cloud providers must be accountable for their data handling practices. The potential long provider chains in cloud computing introduces additional accountability challenges, and this paper examines requirements which must be fulfilled to achieve an accountability-based approach.
Prompt acknowledgment (ACK) of received packets is key to achieving high throughputs in the Transmission Control Protocol (TCP) data flows. This also applies to Multipath TCP (MPTCP), a variant of TCP that bundles multiple paths into a single logical flow. However, the original MPTCP takes advantage of multiple paths only when sending data packets, not ACK packets. In the original MPTCP, an ACK packet...
Recent increase in demand for next-to-source data processing and low-latency applications has shifted attention from the traditional centralized cloud to more distributed models such as edge computing. In order to fully leverage these models it is necessary to decentralize not only the computing resources but also their management. While a decentralized cloud has various inherent advantages, it also...
High availability of containerized applications requires to perform robust storage of applications’ state. Since basic replication techniques are extremely costly at scale, storage space requirements can be reduced by means of erasure and/or repairing codes.In this paper we address storage regeneration using repair codes, a robust distributed storage technique with no need to fully restore the whole...
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