Nghiên cứu vẫn tiến hành ghim phiên bản trong các điều kiện chính xác khi tiến bộ là có thể có trong mỗi phương pháp tiếp cận tối đa tỷ lệ CCIE chuyên nghiệp phát triển: Giải pháp mạng IP quy mô lớn là một sự chuẩn bị chính sách giáo khoa cho theo dõi kỳ thi. | Chapter 26 Other Distributed and Transactional Systems 461 26. Other Distributed and Transactional Systems In this chapter we review some of the advanced research efforts in the areas covered by the text. The first section focuses on message-passing and group-communication systems and the second on transactional systems. The review is not intended to be exhaustive but we do try to include the major activities that contributed to the technology areas stressed in the text itself. Related Work in Distributed Computing There there have been many distributed systems in which group communication played a role. We now review some of these systems providing a brief description of the features of each and citing sources of additional information. Our focus is on distributed computing systems and environments with support for some form of process group computing. However we do not limit ourselves to those systems implementing virtually synchronous process groups or a variation on the model. Our review presents these systems in alphabetical order. Were we to discuss them chronologically we would start by considering V then the Isis Toolkit and Delta-4 and then we would turn to the others in a roughly alphabetical ordering. However it is important to understand that these systems are the output of a vigorous research community and that each of the systems cited included significant research innovations at the time it was developed. It would be simplistic to say that any one of these systems came first and that the remainder are somehow secondary. More accurate would be to say that each system innovated in some areas and borrowed ideas from prior systems in other areas. Readers interested in learning more about this area may want to start by consulting the papers that appeared in Communications of the ACM in a special section of the April 1996 issue Vol. 39 No. 4 . David Powell s introduction to this special section is both witty and informative Pow96 and there are papers
