MapReduce has emerged as a leading programming model for data-intensive computing. Many recent research efforts have focused on improving the performance of the distributed frameworks supporting this model. Many optim...
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Virtualization can provide significant benefits in data centers, such as dynamic resource configuration, live virtual machine migration. services are deployed in virtual machines (VMs) and resource utilization can be ...
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Due to sparse of RDF data, RDF storage approaches using triple table or binary file rarely show high storage usage and high query performance. To achieve the goal of decreasing storage space and improving the efficien...
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Efficient metadata management is a critical aspect of overall system performance in large distributed storage systems. Directory subtree partitioning and traditional hashing are two common techniques used for managing...
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Desktop virtualization is a very hot concept in both industry and academic communities. Since virtualized desktop system is based on multiple virtual machines (VM), it is necessary to design a distributed storage syst...
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Desktop virtualization is a very hot concept in both industry and academic communities. Since virtualized desktop system is based on multiple virtual machines (VM), it is necessary to design a distributed storage system to manage the VM images. In this paper, we design a distributed storage system, VMStore, by taking into account three important characteristics: high performance VM snapshot, booting optimization from multiple images and redundancy removal of images data. We adopt a direct index structure of blocks for VM snapshots to speed up VM booting performance significantly; provide a distribute storage structure with good bandwidth scalab.lity by dynamically changing the number of storage nodes; and propose a data preprocessing strategy with intelligent object partitioning techniques, which would eliminate duplication more effectively. Performance analysis for VMStore focuses on two metrics: the speedup of VM booting and the overhead of de-duplication. Experimental results show the efficiency and effectiveness of VMStore.
Currently there is no practical standard for grid middleware, most of the grid platforms are built by their own, and it's not easy to interoperate these grid platforms. Information service is one of the key compon...
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Bibliographical information of scientific papers is of great value since the Science Citation Index is introduced to measure research impact. Most scientific documents availab.e on the web are unstructured or semi-str...
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Exploits sequencing is a typical way by which an attacker breaks into a network. In such a scenario, each exploit lays as an atomic proposition for subsequent exploits. An attack path is seen as a succession of exploi...
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In the paper, based on the job characteristics and resources availab.lity, an optimistic checkpoint mechanism for dynamic grids(OCM4G) is proposed. It can determine whether to checkpoint a given job running on a giv...
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In the paper, based on the job characteristics and resources availab.lity, an optimistic checkpoint mechanism for dynamic grids(OCM4G) is proposed. It can determine whether to checkpoint a given job running on a given resource node and establish optimal aperiodic checkpoint intervals by applying the knowledge of job characteristics and resource availab.lity. We evaluate OCM4G over a real grid environment (Chitlagrid) and the results show that OCM4G achieves better performance than the periodic checkpoint and the analytical method of calculating aperiodic checkpoint intervals.
Emerging data centers may host a large number of applications that consume CPU power, memory, and I/O resources. Previous studies focus on the allocation of resources in order to perfectly satisfy the demands seen in ...
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