IEEE Kansai Section第5回技術講演会

IEEE Kansai Section第5回技術講演会



``Fault-Tolerant Group Communication Services: An Overview and an Approach''


Prof. Nancy Lynch (Laboratory for Computer Science and Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology)

日時(Time & Date)

2000年7月7日(金) 13:30~15:00


NTTコミュニケーション科学基礎研究所 大会議室
〒619-0237 京都府相楽郡精華町光台2-4
Tel: 0774-93-5010
Fax: 0774-95-5015


 Many modern distributed systems are dynamic, in the sense that the set of participating clients changes frequently over time, due to network and processor failure and recovery, and due to changes in client requirements. A popular approach to organizing dynamic distributed systems is to introduce abstract, named "groups" of client processes whose membership is allowed to change over time. A client in such a group can communicate with other members of the group by sending messages to the group as a whole, rather than by sending to individual members.
 A "group communication service" supports management of such a group. It maintains information about membership in the group, accommodating changes in network status and handling requests by client processes to join and leave the group. It also manages the communication among clients. By separating out the group management functions, such a service can greatly simplify the clients' job.
 Group communication services vary greatly in terms of the guarantees they provide on message ordering and reliability. Some, like IP Multicast, provide only best-effort communication guarantees, whereas others, like Isis, Transis, and Ensemble, provide strong consistency guarantees for the messages received by different clients. Services with stronger guarantees are generally more costly, in terms of communication load and latency.
 This talk will present a survey of the area of group communication systems, and will describe work done in the MIT Theory of Distributed Systems group on designing, modeling, and analyzing such systems.


Nancy Lynch is the NEC Professor of Software Science and Engineering in the EECS department at MIT and heads the Theory of Distributed Systems research group at the Laboratory for Computer Science.She is the author of numerous research articles about distributed algorithms and impossibility results, and about formal modeling and validation of distributed systems. She is the author of the graduate textbook "Distributed Algorithms". She is an ACM Fellow.
Prof. Lynch's academic training was in math, at Brooklyn College and MIT. She served on the math and computer science faculty at several other universities, including the University of Southern California and Georgia Tech, prior to joining the MIT faculty in 1982. Since then, she has been working on applying mathematics to the tasks of understanding and constructing complex distributed systems.

参加費 (Fee)

無料 (Free)

参加申込み先 (Contact for registration)

619-288 京都府相楽郡精華町光台2-2
Yumiko Honjo (ATR MIS Labs.)
Tel: (0774) 95 1404
Fax: (0774) 95 1408

本件連絡先 (For further information)

IEEE Kansai Section Technical Program Committee Secretary
間瀬 健二(ATR知能映像通信研究所)


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