Cloud computing for data driven science and engineering
During the past decade, data driven science and engineering have emerged as a key paradigm for performing scientific research, enabling innovations through new kinds of experiments that were earlier impossible. Today's science has access to advanced instruments like next generation genome sequencers, gigapixel survey telescopes, and networks of sensors that monitor cyber physical systems, and these are generating datasets that are growing exponentially in complexity and data volume. Big Data, across all dimensions of volume, velocity, variety, and veracity, are offering unique opportunities to enable scientific discovery as well as novel challenges to scientific platforms. Such dynamic, distributed, and data intensive applications hold the solutions to vital scientific and societal problems of the 21st century. In order to achieve breakthrough in new knowledge, there is a need to develop data driven system models, perform analytics at large scales, manage data from instruments and analyses, and share and visualize the results with scientific peers and the society at large. To this end, cloud computing offers a computing model for running such data intensive scientific and engineering applications. Clouds have democratized resource access to underserved disciplines, making it possible to perform nontrivial scientific explorations for just a few hundred dollars. Clouds are particularly cost effective for Big Data applications due to their co location of elastic compute resources with data, and their use of commodity hardware, which economizes on costs for non high performance computing (HPC) workloads. Many contemporary Big Data platforms that have emerged from online enterprises such as Google and Twitter are also optimized for such commodity hardware, as found in their own data centers. Of course, there are costs associated with data transfer and storage, in keeping with the pay as you go model, that may not be well suited for applications requiring frequent transfer of and long term storage of terabytes of data. Likewise, it is valuable to understand how data intensive or even HPC applications that have been developed for computing grids, at one end, and applications developed for workstation tools like MATLAB and R, at the other end, can be effectively run on clouds. These are some of the practical realities that are worth exploring on the relevance of clouds for data driven scientific applications. In this special issue, we have compiled a set of articles that discusses new research, development, and deployment efforts in running eScience and eEngineering workloads on cloud infrastructures and platforms. The open solicitation, which followed the 3rd Workshop on Scientific Cloud Computing (ScienceCloud) invited research and case studies on a variety of topics relevant to data driven scientific computing on clouds: use of cloud based technologies to address innovative compute and data driven scientific problems that are not well served by current HPC clusters and grids, programming platforms for elastic and Big Data applications, performance and cost effective computing on clouds, and gaps in diverse cloud fabrics and service offerings, among others. In all, the special issue received 28 articles, of which six were selected for publication after multiple rounds of reviews and revisions. The special issue starts with two articles that explore the runtime platform support required for executing Big Data science on clouds. In TomusBlobs: Scalable Data Intensive Processing on Azure Clouds [1] the authors address the limitations of data storage within IaaS clouds such as Amazon S3 and Microsoft Azure BLOBs that are, while co located in the data center, not present in the virtual machines (VMs) and need to be accessed over the network. Their distributed storage on VMs is optimized for concurrent access and elastic scaling, even
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