Download or read book Exploiting Weak Connectivity in a Distributed File System written by Carnegie Mellon University. Computer Science Department and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Weak connectivity, in the form of intermittent, low- bandwidth, or expensive networks is a fact of life in mobile computing. For the foreseeable future, access to cheap, high-performance, reliable networks, or strong connectivity will be limited to a few oases, such as work or home, in a vast desert of weak connectivity. The design of distributed file systems has traditionally been based on an assumption of strong connectivity. Yet, to provide ubiquitous data access, it is vital that distributed file systems make effective use of weak connectivity. This dissertation describes the design, implementation, and evaluation of weakly connected operation in the Coda File System. The starting point of this work is disconnected operation, in which a file system client operates using data in its cache during server or network failures. Disconnected clients suffer from many limitations: updates are not visible to other clients, cache misses may impede progress, updates are at risk from client loss or damage, and the danger of update conflicts increases as disconnections are prolonged. Weak connectivity provides an opportunity to alleviate these limitations. Coda's strategy for weakly connected operation is best characterized as application-transparent adaptation. The system bears full responsibility for coping with the demands of weak connectivity. This approach preserves upward compatibility by allowing applications to run unchanged. Coda provides several mechanisms for weakly connected operation motivated by actual experience. The foundation of adaptivity in this system is the communications layer, which derives and supplies information on network conditions to higher system layers. The rapid cache validation mechanism enables the system to recover quickly in intermittent environments. The trickle reintegration mechanism insulates the user from poor network performance by propagating updates to servers asynchronously. The cache miss handling mechanism alerts the user to potentially lengthy service times and provides opportunities for intervention. A quantitative evaluation of these mechanisms, based on controlled experimentation and empirical data gathered from the deployed system in everyday use, shows that Coda is able to provide good performance even when network bandwidth varies over four orders of magnitude -- from modem speeds to Lan speeds."
Download or read book Exploiting Weak Connectivity in a Distributed File System written by Carnegie-Mellon University. Computer Science Dept and published by . This book was released on 1996 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Weak connectivity, in the form of intermittent, low- bandwidth, or expensive networks is a fact of life in mobile computing. For the foreseeable future, access to cheap, high-performance, reliable networks, or strong connectivity will be limited to a few oases, such as work or home, in a vast desert of weak connectivity. The design of distributed file systems has traditionally been based on an assumption of strong connectivity. Yet, to provide ubiquitous data access, it is vital that distributed file systems make effective use of weak connectivity. This dissertation describes the design, implementation, and evaluation of weakly connected operation in the Coda File System. The starting point of this work is disconnected operation, in which a file system client operates using data in its cache during server or network failures. Disconnected clients suffer from many limitations: updates are not visible to other clients, cache misses may impede progress, updates are at risk from client loss or damage, and the danger of update conflicts increases as disconnections are prolonged. Weak connectivity provides an opportunity to alleviate these limitations. Coda's strategy for weakly connected operation is best characterized as application-transparent adaptation. The system bears full responsibility for coping with the demands of weak connectivity. This approach preserves upward compatibility by allowing applications to run unchanged. Coda provides several mechanisms for weakly connected operation motivated by actual experience. The foundation of adaptivity in this system is the communications layer, which derives and supplies information on network conditions to higher system layers. The rapid cache validation mechanism enables the system to recover quickly in intermittent environments. The trickle reintegration mechanism insulates the user from poor network performance by propagating updates to servers asynchronously. The cache miss handling mechanism alerts the user to potentially lengthy service times and provides opportunities for intervention. A quantitative evaluation of these mechanisms, based on controlled experimentation and empirical data gathered from the deployed system in everyday use, shows that Coda is able to provide good performance even when network bandwidth varies over four orders of magnitude -- from modem speeds to Lan speeds."
Download or read book Disconnected Operation in a Distributed File System written by James J. Kistler and published by Springer Science & Business Media. This book was released on 1995-12-13 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is based on the author's PhD thesis which was selected during the 1993 ACM Doctoral Dissertation Competition as one of the three best submissions. The focus of this work is on the issue of availability in distributed file systems. It presents the important new technique called disconnected operation, in which clients mask failures and voluntary network detachments by emulating the functionality of servers where actual server-oriented solutions are inadequate. This permits client operation even under complete isolation from the server; the clean integration of mobile computers into the system is an important side-effect of the new technique. The design and implementation of disconnected file service in a working system, the Coda file system, is described in detail.
Download or read book Exploiting Weak Connectivity for Mobile File Access written by Lily B. Mummert and published by . This book was released on 1995 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Weak connectivity, in the form of intermittent, low- bandwidth, or expensive networks is a fact of life in mobile computing. In this paper, we describe how the Coda File System has evolved to exploit such networks. The underlying theme of this evolution has been the systematic introduction of adaptivity to eliminate hidden assumptions about strong connectivity. Many aspects of the system, including communication, cache validation, update propagation and cache miss handling have been modified. As a result, Coda is able to provide good performance even when network bandwidth varies over four orders of magnitude -- from modem speeds to LAN speeds."
Download or read book Exploiting Weak Connectivity for Mobile File Access written by L. B. Mummert and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Intelligence in Communication Systems written by Finn Arve Aagesen and published by Springer. This book was released on 2004-11-03 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2004 IFIP International Conference on Intelligence in Communication S- tems(INTELLCOMM2004),heldinBangkok,Thailand,23–26November2004, was the successor and an expansion of SMARTNET, a series of annual conf- ences on intelligence in networks held during 1995–2003 under the auspices of IFIP TC6’s Working Group 6. 7. The Internet and Web provide more connection facilities, hence the man-man, man-machine and machine-machine interactions will increase and communication will have an important role in modern s- tems. Inordertoobtaine?ectiveande?cientcommunication,artistic,socialand technical issues have to be tackled in a holistic and integrated manner. However, communicationtechniques,conceptsandsolutionswhichhavebeendevelopedso far treat these issues separately, so that there arises a need for communication researchers and practitioners in di?erent ?elds (engineering, science and arts) to meet, share their experience and explore all possibilities of developing in- grated and advanced solutions which incorporate ideas from such disciplines as communication arts, art design, linguistics, Web technologies, computer system architecture and protocols, computer science and arti?cial intelligence. INTELLCOMM 2004 was jointly sponsored by IFIP WG 6. 7: Smart N- works and WG 6. 4: Internet Applications Engineering and aimed to provide an international forum which brings academia, researchers, practitioners and s- vice providers together. The discussion areas covered the latest research topics andadvancedtechnologicalsolutionsintheareaofintelligenceincommunication systems, ranging from architectures for adaptable networks/services and Sem- ticWeb/Webservicestechnologiestointelligentserviceapplicationinterfaceand intelligent human interaction. INTELLCOMM 2004 received 112 paper submissions from 28 countries. From these, 24 were accepted, and are included in this proceedings. There were also 3 papers accepted for poster presentation, published separately.
Download or read book Distributed Computing IWDC 2004 written by Nabanita Das and published by Springer Science & Business Media. This book was released on 2004-12-16 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 6th International Workshop on Distributed Computing, IWDC 2004, held in Kolkata, India in December 2004. The 27 revised full papers and 27 revised short papers presented together with 3 invited contributions and abstracts of 11 reviewed workshop papers were carefully reviewed and selected from 157 submissions. The papers are organized in topical sections on distributed algorithms, high-performance computing, distributed systems, wireless networks, information security, network protocols, reliability and testing, network topology and routing, mobile computing, ad-hoc networks, and sensor networks.
Download or read book Guide to Reliable Distributed Systems written by Amy Elser and published by Springer Science & Business Media. This book was released on 2012-01-15 with total page 733 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the key concepts, principles and implementation options for creating high-assurance cloud computing solutions. The guide starts with a broad technical overview and basic introduction to cloud computing, looking at the overall architecture of the cloud, client systems, the modern Internet and cloud computing data centers. It then delves into the core challenges of showing how reliability and fault-tolerance can be abstracted, how the resulting questions can be solved, and how the solutions can be leveraged to create a wide range of practical cloud applications. The author’s style is practical, and the guide should be readily understandable without any special background. Concrete examples are often drawn from real-world settings to illustrate key insights. Appendices show how the most important reliability models can be formalized, describe the API of the Isis2 platform, and offer more than 80 problems at varying levels of difficulty.
Download or read book Proceedings written by IEEE Computer Society. Technical Committee on the Internet and published by . This book was released on 2002 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers from a winter 2002 symposium describe trends in mobile commerce, enterprise and knowledge management, Internet security, agent technology, content and application architecture, Web engineering, Internet communities, algorithms, network architecture, and performance and protocol. Specific subjects discussed include intelligent Internet search applications based on VLSI associative processors, inferring traffic flow characteristics from aggregated- flow measurement, design and implementation of an unauthorized access tracing system, and adaptive behaviors of intelligent agents based on neural semantic knowledge. Other subjects include dynamic configuration of agent migration protocols for the Internet, security in mobile agent systems, remote attack detection, and multicast over satellite. This work lacks a subject index. Annotation copyrighted by Book News Inc., Portland, OR.
Download or read book Proceedings of the USENIX Annual Technical Conference written by and published by . This book was released on 1999 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Move to Meaningful Internet Systems 2004 CoopIS DOA and ODBASE written by R. Meersman and published by Springer Science & Business Media. This book was released on 2004-10-14 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt: This two-volume set LNCS 3290/3291 constitutes the refereed proceedings of the three confederated conferences CoopIS 2004, DOA 2004, and ODBASE 2004 held as OTM 2004 in Agia Napa, Cyprus in October 2004. The 94 revised full papers presented were carefully reviewed and selected from a total of 380 submissions. In accordance with the three OTM 2004 main conferences CoopIS, DOA, and ODBASE, the papers are devoted to interoperability, workflow, and cooperation; distributed objects, infrastructure and enabling technology, and Internet computing; and data and Web semantics.
Download or read book The Practical Handbook of Internet Computing written by Munindar P. Singh and published by CRC Press. This book was released on 2004-09-29 with total page 1399 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Practical Handbook of Internet Computing analyzes a broad array of technologies and concerns related to the Internet, including corporate intranets. Fresh and insightful articles by recognized experts address the key challenges facing Internet users, designers, integrators, and policymakers. In addition to discussing major applications, it also covers the architectures, enabling technologies, software utilities, and engineering techniques that are necessary to conduct distributed computing and take advantage of Web-based services. The Handbook provides practical advice based upon experience, standards, and theory. It examines all aspects of Internet computing in wide-area and enterprise settings, ranging from innovative applications to systems and utilities, enabling technologies, and engineering and management. Content includes articles that explore the components that make Internet computing work, including storage, servers, and other systems and utilities. Additional articles examine the technologies and structures that support the Internet, such as directory services, agents, and policies. The volume also discusses the multidimensional aspects of Internet applications, including mobility, collaboration, and pervasive computing. It concludes with an examination of the Internet as a holistic entity, with considerations of privacy and law combined with technical content.
Download or read book Wireless Networking and Mobile Data Management written by R.K. Ghosh and published by Springer. This book was released on 2017-04-20 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines two main topics, namely, Wireless Networking and Mobile Data Management. It is designed around a course the author began teaching to senior undergraduate and master’s students at the Department of Computer Science & Engineering of the Indian Institute of Technology Kanpur. The first part of the book, consisting of eight chapters, including the introduction, focuses exclusively on wireless networking aspects. It begins with cellular communication systems, which provided the foundation of wireless networking principles. Three subsequent chapters are devoted to the Global System for Mobile communication (GSM), Wireless Local Area Network (WLAN), Bluetooth, infrared (IR), ZigBee and 6LoWPAN protocols. There is also a chapter on routings in ad hoc networks, an area that is currently being intensively researched due to its potential applications in areas of vehicular network, traffic management, tactical and military systems. Furthermore, the book discusses mobile operating systems and wireless network application level protocols such as Wireless Application Protocols (WAP), Mobile IP and Mosh. The second part highlights mobile data management. It addresses the issues like location management, the importance of replication and caching in mobile environments, the concept of broadcast disk and indexing in air, storage systems for sharing data in mobile environments, and building smart environments. Given that the design of algorithms is the key to applications in data management; this part begins with a chapter on the type of paradigm shift that has been introduced in the design of algorithms, especially due to asymmetry in mobile environments. Lastly, the closing chapter of the book explores smart environments, showing the readers how wireless technology and mobile data management can be combined to provide optimum comfort for human life. Though the book has been structured as a monograph, it can be used both as a textbook and as a reference material for researchers and developers working in the area.
Download or read book Embedded and Ubiquitous Computing written by Tei-Wei Kuo and published by Springer. This book was released on 2007-11-25 with total page 789 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the International Conference on Embedded and Ubiquitous Computing, EUC 2007, held in Taipei, Taiwan, in December 2007. The 65 revised full papers presented were carefully reviewed and selected from 217 submissions. The papers are organized in topical sections. They include sections on power aware computing, reconfigurable embedded systems, wireless networks, real-time/embedded operating systems, and embedded system architectures.
Download or read book Intelligent Information Technology written by Gautam Das and published by Springer. This book was released on 2005-01-28 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 7th International Conference on Information Technology (CIT 2004) was held in Hyderabad, India, during December 20–23, 2004. The CIT 2004 was a forum where researchers from various areas of information technology and its applications could stimulate and exchange ideas on technological advancements. CIT, organizedby the Orissa InformationTechnologySociety (OITS), has emerged as one of the major international conferences in India and is fast becoming the premier forum for the presentation of the latest research and development in the critical area of information technology. The last six conferences attracted reputed researchers from around the world, and CIT 2004 took this trend forward. This conference focused on the latest research ?ndings on all topics in the area of information technology. Although the natural focus was on computer science issues, research results contributed from management, business and other disciplines formed an integral part. We received more than 200 papers from over 27 countries in the areas of com- tational intelligence, neural networks, mobile and adhoc networks, security, databases, softwareengineering,signal andimageprocessing,andInternetandWWW-basedc- puting. The programme committee, consisting of eminent researchers, academicians and practitioners, ?nally selected 43 full papers on the basis of reviewer grades. This proceedings contains the research papers selected for presentation at the c- ference and this is the ?rst time that the proceedingshave been published in the Lecture Notes in Computer Science (LNCS) series. The poster papers are being printed as a separate conference proceedings.
Download or read book Distributed Platforms written by Alexander Schill and published by Springer. This book was released on 2013-04-18 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: Client/Server applications are of increasing importance in industry, and have been improved by advanced distributed object-oriented techniques, dedicated tool support and both multimedia and mobile computing extensions. Recent responses to this trend are standardized distributed platforms and models including the Distributed Computing Environment (DCE) of the Open Software Foundation (OS F), Open Distributed Processing (ODP), and the Common Object Request Broker Architecture (CORBA) of the Object Management Group (OMG). These proceedings are the compilation of papers from the technical stream of the IFIPIIEEE International Conference on Distributed Platforms, Dresden, Germany. This conference has been sponsored by IFIP TC6.1, by the IEEE Communications Society, and by the German Association of Computer Science (GI -Gesellschaft fur Informatik). ICDP'96 was organized jointly by Dresden University of Technology and Aachen University of Technology. It is closely related to the International Workshop on OSF DCE in Karlsruhe, 1993, and to the IFIP International Conference on Open Distributed Processing. ICDP has been designed to bring together researchers and practitioners who are studying and developing new methodologies, tools and technologies for advanced client/server environ ments, distributed systems, and network applications based on distributed platforms.
Download or read book Proceedings of the Thirteenth Annual ACM Symposium on Principles of Distributed Computing written by and published by Association for Computing Machinery (ACM). This book was released on 1994 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
