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5G operators will utilize mobile edge computing (MEC) to shorten transmitting latency and fulfill the requirements of increasing mobile applications for high bandwidth and ultra-low latency. A mobile online system (MOS) supports mobile online applications to trigger events in the mobile devices, refresh data, and maintain data consistency in the clouds. As users run mobile online applications, a MOS...
Recent computer systems research has proposed using redundant requests to reduce latency. The idea is to replicate a request so that it joins the queue at multiple servers. The request is considered complete as soon as any one copy of the request completes. Redundancy is beneficial because it allows us to overcome server-side variability – the fact that the server we choose might be temporarily slow...
In spite of the improvement brought by recent research on load balancing in video on demand (VOD) system, it still as an actuality problem. In this paper we propose a payoff-based dynamic segment replication policy called P-DSR which instead of replicating the entire video file, it divides it into several segments then selects the segments with the highest payoff which can rebalance load faster and...
Cloud patterns are described as good solutions to recurring design problems in a cloud context. These patterns are often inherited from Service Oriented Architectures or Object Oriented Architectures where they are considered good practices. However, there is a lack of studies that assess the benefits of these patterns for cloud applications. In this paper, we conduct an empirical study on a Restful...
Recently, cloud computing frameworks have gained popularity for processing large scale parallel data applications. They usually generate enormous amounts of intermediate data which are short-lived, yet are important for the completion of job. Once there are server failures, it leads to the failures of the intermediate data, and then affects the computation of the whole job. However, the existing fault-tolerant...
Efficient retrieval of replicated data from multiple disks is a challenging problem. Traditional retrieval techniques assume that replication is done at a single site using homogeneous disk arrays having no initial load or network delay. Recently, generalized retrieval algorithms are proposed to cover heterogeneous disk arrays, initial loads, and network delays. Generalized retrieval algorithms achieve...
There is an emerging trend to deploy services in cloud environments due to their flexibility in providing virtual capacity and pay-as-you-go billing features. Cost-aware services demand computation capacity such as virtual machines (VMs) from a cloud operator according to the workload (i.e., service invocations) and pay for the amount of capacity used following billing contracts. However, as recent...
The Time-Dependent Execution Design Pattern describes a way of temporally decoupling a client and a server instance, based on the possibility to specify a point in time at which the operation required by the client instance will be executed on the server instance.
Quorums is a well-known concept extensively used in designing distributed algorithms requiring coordination among a number of nodes to ensure i) consistency of replicated data/perceived events/computed results etc. and ii) availability of the hosted service. Quorum is a subset of nodes present in a replicated server system satisfying some conditions. A lot of research has been done proposing various...
Data Grid provides geographically distributed storage resources for large-scale data-intensive applications that generate large data sets. Because data is the important resource in data grids, an efficient management is needed to minimize the response time of applications. Replication is typically used in data grids to improve access time and to reduce the bandwidth consumption. In this paper, we...
The data replication is a very important technique for the availability of data in the grids. One of the challenges in data replication is the replicas placement. In this paper, we present our contribution by proposing a replicas placement strategy in a hierarchical grid. Our approach is based on a dynamic threshold, contrary to the other strategies of replicas placement which use a static threshold...
Service-oriented architecture (SOA) paradigm for orchestrating large-scale distributed applications offers significant cost savings by reusing existing services. However, the high irregularity of client requests and the distributed nature of the approach may deteriorate service response time and availability. Static replication of components in datacenters for accommodating load spikes requires proper...
Today most web applications are deployed on multi-tier architectures, such as those based on J2EE. These applications need to be highly available and scalable. Replication is used to achieve these properties. Most J2EE application servers provide some form of replication. This paper reports on the performance evaluation of the replication protocol included in the JOnAS J2EE application server. The...
Nowadays, medium or large-scale distributed infrastructures such as clusters and grids are widely used to host various kinds of applications (e.g. web servers or scientific applications). Resource management is a major challenge for most organizations that run these infrastructures. Many studies show that clusters are not used at their full capacity and that there are therefore a huge source of waste...
A successful IT Company is characterized by its ability to put the right information in front of the right decision-makers at the right time while concerns about security issues. These objectives require a strategy for reducing the costs, minimizing the risks, and enabling an agile management system. But existing solutions often focus on the unsustainable infrastructures that consumes IT resources...
Replication is used in distributed and pervasive computing systems to enhance availability by placing needed data close to the users so that user perceived response time is minimized. In multi-tier data grid environment, replicas are usually placed in either top-down or bottom-up way. We believe that availability of data can be greatly enhanced by using both methods in a coherent way. Our proposed...
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