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WFTXB: A Tool for Translating between XPDL and BPEL

WFTXB: A Tool for Translating between XPDL and BPEL

引用

IEEE International Conference on High Performance computing and Communications (HPCC)

作者： Pingpeng Yuan Hai Jin Shilun Yuan Wenzhi Cao Laiyuan Jiang Service Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

The Business Process Execution Language for Web services (BPEL) has emerged as the de-facto standard for implementing processes. While being a powerful language, BPEL is difficult to use. As a result only experienced users are able to select the right construct. However, XPDL, which was proposed by Workflow Management Coalition, are widely accepted by enterprises. Therefore, this paper presents a tool, named as workflow transformation system between XPDL and BPEL (WFTXB) to automatically translate workflow expressed in terms of XPDL onto BPEL, and vice versa. For transformation between XPDL and BPEL, the tool adopts the graph structure as intermediate language. During the transformation, the tool first analyses the structures of process, and gets the result of map-like structure, which is expressed with adjacency matrix. Then the tool scans the adjacency matrix and identifies the structure of block. Finally, the tool generates BPEL or XPDL code.

关键词： Business Web services Transforms Switches XML Process control Computer languages

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Dynamic Processor Resource Configuration in Virtualized Environments

Dynamic Processor Resource Configuration in Virtualized Envi...

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IEEE International Conference on Services computing (SCC)

作者： Hai Jin Li Deng Song Wu Xuanhua Shi Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

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 greatly improved. In this paper, we present VScheduler, a system that dynamically adjusts processor resource configuration of virtual machines, including the amount of virtual resource and a new mapping of virtual machines and physical nodes. VScheduler implements a two-level resource configuration scheme -- local resource configuration (LRC) for an individual virtual machine and global resource configuration (GRC) for a whole cluster or data center. GRC especially takes variation tendency of workloads into account when remapping virtual machines to physical nodes. We implement our techniques in Xen and conduct a detailed evaluation using RUBiS and dbench. The experimental results show that VScheduler not only satisfies resource demands of services, but also reduces the number of virtual machines migration, which can provide a stable VM distribution on physical nodes in data centers.

关键词： Virtual machining Resource management Dynamic scheduling Servers Hardware Benchmark testing Computer architecture

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TCPBridge: A software approach to establish direct communications for NAT hosts

TCPBridge: A software approach to establish direct communica...

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ACS/IEEE International Conference on Computer Systems and Applications

作者： Sanmin Liu Hai Jin Xiaofei Liao Hong Yao Deze Zeng Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

Traversing network address translation (NAT) for peer-to-peer (P2P) communication has become a hot topic recently. Compared to UDP, establishing TCP connections for hosts behind different NATs is more complex. Thus, many TCP-based applications do not address TCP traversal through NATs. Some solutions suggest using delegates to relay all communications, or tunneling TCP over UDP. However, they require a big reform to network architecture, or using a nonstandard TCP/IP stack. In this paper, we present a novel idea called TCPBridge. TCPBridge converts TCP traversal to UDP traversal without modifying any binaries of the TCP-based applications. Our design can be integrated with those P2P applications which have not solved TCP traversal problem, and extends them to support direct communications between NAT hosts. It deals with the problem of TCP traversal, so as to improve the usability of applications. We have implemented TCPBridge in several existing P2P systems. Statistics prove that TCPBridge is scalable and robust, and we believe it will benefit many other existing P2P applications.

关键词： Network address translation TCPIP Application software Punching Robustness Protocols Communication system software grid computing Computer science Peer to peer computing

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Building an automated trust negotiation system

Building an automated trust negotiation system

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International Conference on Information, Communications and Signal Processing

作者： Hai Jin Zhensong Liao Deqing Zou Chisong Li Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781424409822;1424409829

Automated trust negotiation (ATN) is an important means to establish trust between strangers through the exchange of digital credentials and mobile access control policies specifying what combinations of credentials a stranger must submit. While ATN provides a good mechanism to share resources in the distributed environments, there still exist some problems in ATN. A notable issue is that it is difficult to build a practical system. And no guidance is given on how to realize an ATN system. Previous work focused on presenting trust negotiation models or schemes, and most work aimed at protecting privacy and preventing sensitive information from leaking. In this paper, we pay much attention on how to build an ATN system, and design and implement a toy ATN system. We present a new means to implement access control policy, digital credential and its matching. A use case is studied to prove the toy system is sound and reasonable.

关键词： Access control Protocols Protection grid computing Computer science Mobile computing Privacy Authentication Authorization LAN interconnection

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Meld: A Real-Time Message Logic Debugging System for Distributed Systems

Meld: A Real-Time Message Logic Debugging System for Distrib...

引用

IEEE Asia-Pacific Conference on Services computing (APSCC)

作者： Xuping Tu Hai Jin Xuepeng Fan Jiang Ye Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

The largest difference between a distributed and a non-distributed system is that the former introduces network messages to the system. Network messages bring the scalability to a distributed system as well as complexity to it. Testing large-scale distributed systems is a great challenge, because some errors happen after a distributed sequence of events that involves machine and network failures. Meld is a checker that allows developers to specify expected message logic on a deployed distributed system, and that verifies these logics while the system is running. When Meld finds a problem it starts collecting more information that led to the problem, allowing developers to quickly find the root cause. Developers write message logics on Meld and Meld verifies them through analyzing the collected abstract of messages. By using binary instrumentation, Meld works almost transparently with debugged systems and can change logics to be checked at runtime. An evaluation with a deployed system shows that Meld can detect non-trivial correctness at runtime.

关键词： Servers Debugging Runtime Monitoring Computer bugs Receivers Payloads

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Assessing MapReduce for Internet computing: A Comparison of Hadoop and BitDew-MapReduce

Assessing MapReduce for Internet Computing: A Comparison of ...

引用

International Workshop on grid computing

作者： Lu Lu Hai Jin Xuanhua Shi Gilles Fedak Cluster and Grid Computing Laboratory Services Computing Technology and System Laboratory Huazhong University of Science and Technology Wuhan China INRIA Universitý of Lyon Lyon France

MapReduce is emerging as an important programming model for data-intensive application. Adapting this model to desktop grid would allow taking advantage of the vast amount of computing power and distributed storage to execute new range of application able to process enormous amount of data. In 2010, we have presented the first implementation of MapReduce dedicated to Internet Desktop grid based on the BitDew middleware. In this paper, we present new optimizations to BitDew-MapReduce (BitDew-MR): aggressive task backup, intermediate result backup, task re-execution mitigation and network failure hiding. We propose a new experimental framework which emulates key fundamental aspects of Internet Desktop grid. Using the framework, we compare BitDew-MR and the open-source Hadoop middleware on grid5000. Our experimental results show that 1) BitDew-MR successfully passes all the stress-tests of the framework while Hadoop is unable to work in typical wide-area network topology which includes PC hidden behind firewall and NAT; 2) BitDew-MR outperforms Hadoop performances on several aspects: scalability, fairness, resilience to node failures, and network disconnections.

关键词： Peer to peer computing Runtime Internet Dynamic scheduling Distributed databases Heart beat Data processing

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Access control of global distributed storage system

Access control of global distributed storage system

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International Conference on Computer and Information Technology (CIT)

作者： Chao Xie Hai Jin Song Wu Shengli Li Zhiping Wang Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)0769522165

In this paper, we identify the access control requirements for data grid and describe a new distributed access control model to meet these requirements. The model integrates ticket-based data access control and extends access control list. The data sharing and access control among different users and groups are completed by the combination of team-based access control methods and role-based access control methods, called group-and-role-based access control. In this paper, we present the GDSS system to describe this model and evaluate the performance.

关键词： Access control Distributed computing Computer architecture Environmental management Resource management Authentication Secure storage Centralized control Chaos grid computing

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An Open Distributed Real-time Environment Based on Variable Utilization Server

An Open Distributed Real-time Environment Based on Variable ...

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International Multi-Symposiums on Computer and Computational Sciences (IMSCCS)

作者： Pengliu Tan Hai Jin Minghu Zhang Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

This paper extends the environment for open distributed real-time systems, where hard or soft real-time applications may run concurrently with non-real-time applications. We replace the top-level improved constant utilization server scheduler of the open system architecture in with variable utilization server scheduler. The proposed open real-time environment in this paper allows tasks in each application to share local and global nonpreemptive resources, which accommodates a much broader spectrum of real-time applications. Additionally, the extended environment assigns CPU bandwidth to each server in a more flexible and more adaptive way. The evaluation results show the performance of the open system is also improved considerably

关键词： Real time systems Bandwidth Application software Iris Open systems grid computing Computer science Processor scheduling Time factors Protection

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Container lifecycle-aware scheduling for serverless computing

Container lifecycle-aware scheduling for serverless computin...

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作者： Wu, Song Tao, Zhiheng Fan, Hao Huang, Zhuo Zhang, Xinmin Jin, Hai Yu, Chen Cao, Chun National Engineering Research Center for Big Data Technology and System Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China State Key Laboratory for Novel Software Technology Department of Computer Science and Technology Nanjing University Nanjing China

Elastic scaling in response to changes on demand is a main benefit of serverless computing. When bursty workloads arrive, a serverless platform launches many new containers and initializes function environments (known as cold starts), which incurs significant startup latency. To reduce cold starts, platforms usually pause a container after it serves a request, and reuse this container for subsequent requests. However, this reuse strategy cannot efficiently reduce cold starts because the schedulers are agnostic of container lifecycle. For example, it may ignore soon available containers or evict soon needed containers. We propose a container lifecycle-aware scheduling strategy for serverless computing, CAS. The key idea is to control distribution of requests and determine creation or eviction of containers according to different lifecycle phases of containers. We implement a prototype of CAS on OpenWhisk. Our evaluation shows that CAS reduces 81% cold starts and therefore brings a 63% reduction at 95th percentile latency compared with native scheduling strategy in OpenWhisk when there is worker contention between workloads, and does not add significant performance overhead. © 2021 John Wiley & Sons Ltd.

关键词： Containers

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I/O Scheduling by Using Multi-network Interfaces of Virtualization System

I/O Scheduling by Using Multi-network Interfaces of Virtuali...

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IEEE International Conference on Trust, Security and Privacy in computing and Communications (TrustCom)

作者： Xia Xie Haiqing Zhu Wenzhi Cao Hai Jin Pingpeng Yuan Services Computing Technology and System Laboratory Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

With the development of virtualization technology, it can run more and more guest domains on one single physical machine. So the network I/O demand is also rapidly increasing, for these guest domains can supply more and more services or run more and more applications. This will lead to serious contention on network I/O of physical machine. Although we can use high performance NICs (network interface cards) to improve network I/O performance, one single NIC cannot get further performance improvement which depends on hardware technology. Linux bonding can achieve high bandwidth network by using multiple NICs, but it does not guarantee QoS among guest domains. Also it would terminate one guest domain's communication because of its response mechanism of ARP. Therefore, we present an approach named Virtual Bonding to achieve high bandwidth network by using multi-NICs. It aggregates multi-NICs to provide high bandwidth and high-quality network services. It also introduces load balancing mechanism between multi-NICs. So it can make full use of every NIC. Furthermore, it makes perfect support to virtualization environment.

关键词： Bonding Bridges Bandwidth Load management Servers Linux IP networks

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