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Microservices have become a popular pattern for deploying scale-out application logic and are used at companies like Netflix, IBM, and Google. An advantage of using microservices is their loose coupling, which leads to agile and rapid evolution, and continuous re-deployment. However, developers are tasked with managing this evolution and largely do so manually by continuously collecting and evaluating...
As data volumes and the need for timely analysis grow, Big Data analytics frameworks have to scale out to hundred or even thousands of commodity servers. While such a scale-out is crucial to sustain desired computational throughput/latency and storage capacity, it comes at the cost of increased network traffic volumes and multiplicity of traffic patterns. Despite the sheer reality of the dependency...
HLA-based simulations can experience performance degradation due to communication latencies between simulation federates, which generate significant cumulative overhead. Even though the HLA standard provides mechanisms to decrease the misuse of network resources, it does not present any tool to diminish the communication latencies between interactive federates. Moreover, the interaction dependencies...
In data-centric wireless sensor networks, the malicious nodes may selectively drop some crucial data packets, which seriously destroy the network's data collection and decrease the availability of sensor services. In this paper, we present a lightweight defense scheme against selective forwarding attacks. According to characteristics of easy positioning the nodes around transmission paths in a structured...
We study networks consisting of a very large number of tiny and inexpensive sensors and introduce SWAS (Small-Worlds of Anonymous Sensors), an algorithm combining self-organization based upon small-worlds principles and Medium Access Control based upon a stack protocol for VLSNs and we report on a preliminary study of the algorithm. The nodes of Very Large Sensor Networks (VLSN) have limited resources;...
InfiniBand networks are aimed to fulfill increasing communication demand of parallel applications in high performance clusters. However, the dynamic behavior of communication load may cause bottlenecked link(s) which lead to message congestion. Congestion spreading increases latency and reduces network throughput causing important performance degradation. In this paper, we propose a congestion control...
The peer-to-peer paradigm shows the potential to provide the same functionality and quality like client/server based systems, but with much lower costs. In order to control the quality of peer-to-peer systems, monitoring and management mechanisms need to be applied. Both tasks are challenging in large-scale networks with autonomous, unreliable nodes. In this paper we present a monitoring and management...
The popularity of the Enterprise Service Bus (ESB) pattern as a foundation of Service Oriented Architectures (SOA) for enterprise environments is increasing. Java business integration (JSR-208) is an attempt at Java-centric standardization of the ESB pattern. JSR-208 lacks a complete monitoring facility, which nowadays is crucial for management of complex enterprise environments and for establishing...
Several trends in SIP application server deployments in large scale telephony environments exacerbate the classic problem of feature interaction : use of distributed feature servers, mixing of legacy and green-field feature servers, and the co-existence of multiple third-party feature implementations provisioned in the same environment. Next-generation SIP application servers will include an application...
Distributed application (e.g., grid-enabled application) performance is highly dependent on the information available when computational resources are chosen. A resource selection based on computational resource information complemented with network performance information has the potential to be optimal from the application performance viewpoint. This is particularly true for network-intensive distributed...
Cyber-physical systems denote a new modeling paradigm that promotes a holistic view on complex systems. These systems have been studied before from various particular perspectives using paradigms like ubiquitous and distributed computing or embedded and hybrid systems. In modeling cyber-physical systems one has to consider the interaction between physics, computation and communication (networking),...
In peer-to-peer (P2P) network system design a main focus is on efficient service discovery schemes, most frequently assuming permanent (or long-term stationary) positions for service facilities, neglecting communication costs due to the actual locations of the facilities. Since the problem of communication cost minimization is a large optimization problem (NP-hard) and requires global information...
Efficient coverage area and efficient coverage area ratio of node are put forward by analysis of coverage problem of wireless sensor networks (WSN). It is theoretically proved through math modeling, theoretical analysis and formula deducting that how much the maximum efficient coverage area, the maximum efficient coverage area ratio, the maximum of net efficient coverage area and the maximum of net...
In this paper, we present DSAM, a data stream application manager. DSAM supports the deployment of global queries to distributed and heterogeneous sensor nodes and stream processing systems (SPSs). We provide a graph-based global query language DSAM-AQL. The abstract query language (AQL) is a declarative streamoriented query language that abstracts from topology and distribution of wireless sensor...
By focusing on what can be observed by running traceroute-like measurements at a high frequency from a single monitor to a fixed destination set, we show that the observed view of the topology is constantly evolving at a pace much higher than expected. Repeated measurements discover new IP addresses at a constant rate, for long periods of times (up to several months). In order to provide explanations,...
Tiny devices, smart objects, home gateways, sensor networks, have become an integral part of our everyday life and of our socio-economic ecosystem. However their large number, their distribution and their volatility and heterogeneity make their management fiendishly complex. Traditional management systems, that are mainly ad-hoc or centralized, reach their limits in such complex management contexts...
The research was based on the massive data authorized by CAIDA (The cooperative association for Internet data analysis) Skitter project. We used the k-core decomposition to disentangle the hierarchical structure of Internet router-level topology. Combining with the actual topology measuring data, we first exhibited the pruning procedure of Internet router-level topology. Then we analyzed the characteristics...
In this paper, we propose a fast and reliable data dissemination protocol Cascades to disseminate data from the sink(base station) to all or a subset of nodes in a data collection sensor network. Cascades makes use of the parent-monitor-children analogy to ensure reliable dissemination. Each node monitors whether or not its children have received the broadcast messages through snooping children's...
The evolution of IT and network technologies has generated enormous opportunities for complex service innovation. However, the heterogeneous nature of the resources required for providing such complex services demand efficient coordination of distributed high-end IT resources (storage and computing) interconnected by high-capacity optical networks. To address this issue, a service plane architecture...
Wireless sensor networks (WSN) are receiving growing attention in the research community. As simulation is a frequently used approach to test and validate approaches, simulation environments need to be able to support the various WSN design schemes. Though the research trend in WSN is to address regions instead of single sensor nodes, existing WSN simulation environments still do not support modeling...
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