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State Machine Replication
In computer science, state machine replication (SMR) or state machine approach is a general method for implementing a fault-tolerant service by replicating servers and coordinating client interactions with server replicas. The approach also provides a framework for understanding and designing replication management protocols. Problem definition Distributed service In terms of clients and services. Each service comprises one or more servers and exports operations that clients invoke by making requests. Although using a single, centralized server is the simplest way to implement a service, the resulting service can only be as fault tolerant as the processor executing that server. If this level of fault tolerance is unacceptable, then multiple servers that fail independently can be used. Usually, replicas of a single server are executed on separate processors of a distributed system, and protocols are used to coordinate client interactions with these replicas. State machine For the s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Computer Science
Computer science is the study of computation, automation, and information. Computer science spans theoretical disciplines (such as algorithms, theory of computation, information theory, and automation) to Applied science, practical disciplines (including the design and implementation of Computer architecture, hardware and Computer programming, software). Computer science is generally considered an area of research, academic research and distinct from computer programming. Algorithms and data structures are central to computer science. The theory of computation concerns abstract models of computation and general classes of computational problem, problems that can be solved using them. The fields of cryptography and computer security involve studying the means for secure communication and for preventing Vulnerability (computing), security vulnerabilities. Computer graphics (computer science), Computer graphics and computational geometry address the generation of images. Progr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paxos Algorithm
Paxos ( gr, Παξός) is a Greek island in the Ionian Sea, lying just south of Corfu. As a group with the nearby island of Antipaxos and adjoining islets, it is also called by the plural form Paxi or Paxoi ( gr, Παξοί, pronounced in English and in Greek). The main town and the seat of the municipality is Gaios. The smallest of the seven main Ionian Islands (the Heptanese), Paxos has an area of , while the municipality has an area of and a population of about 2300. Paxos lies some 15 km from the southern tip of Corfu, and at about the same distance from the town of Parga on the mainland. It is connected by ferry lines from Igoumenitsa and Corfu (city), Corfu with Gaios. The island is hilly, the highest point having an elevation of 230 m. In Greek mythology, Poseidon created the island by striking Corfu with his trident, so that he and his wife Amphitrite could have some peace and quiet. History Although it was possibly inhabited from prehistoric times, the Ph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Distributed Computing Problems
Distribution may refer to: Mathematics *Distribution (mathematics), generalized functions used to formulate solutions of partial differential equations * Probability distribution, the probability of a particular value or value range of a variable ** Cumulative distribution function, in which the probability of being no greater than a particular value is a function of that value *Frequency distribution, a list of the values recorded in a sample * Inner distribution, and outer distribution, in coding theory *Distribution (differential geometry), a subset of the tangent bundle of a manifold * Distributed parameter system, systems that have an infinite-dimensional state-space *Distribution of terms, a situation in which all members of a category are accounted for *Distributivity, a property of binary operations that generalises the distributive law from elementary algebra * Distribution (number theory) *Distribution problems, a common type of problems in combinatorics where the go ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raft (computer Science)
A raft is any flat structure for support or transportation over water. It is usually of basic design, characterized by the absence of a hull. Rafts are usually kept afloat by using any combination of buoyant materials such as wood, sealed barrels, or inflated air chambers (such as pontoons), and are typically not propelled by an engine. Rafts are an ancient mode of transport; naturally-occurring rafts such as entwined vegetation and pieces of wood have been used to traverse water since the dawn of humanity. Human-made rafts Traditional or primitive rafts were constructed of wood or reeds. Modern rafts may also use pontoons, drums, or extruded polystyrene blocks. Inflatable rafts up to the 20th century used flotation chambers made of goat- or buffalo-skins, but most now use durable, multi-layered rubberized fabrics. Depending on its use and size, it may have a superstructure, masts, or rudders. Timber rafting is used by the logging industry for the transportation of logs, b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barbara Liskov
Barbara Liskov (born November 7, 1939 as Barbara Jane Huberman) is an American computer scientist who has made pioneering contributions to programming languages and distributed computing. Her notable work includes the development of the Liskov substitution principle which describes the fundamental nature of data abstraction, and is used in type theory (see subtyping) and in object-oriented programming (see inheritance). Her work was recognized with the 2008 Turing Award, the highest distinction in computer science. Liskov is one of the earliest women to have been granted a doctorate in computer science in the United States, and the second woman to receive the Turing award. She is currently an Institute Professor and Ford Professor of Engineering at the Massachusetts Institute of Technology.Barbara Liskov Programming Methodology Group, MIT. < ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Virtual Synchrony
A reliable multicast is any computer networking protocol that provides a '' reliable'' sequence of packets to multiple recipients simultaneously, making it suitable for applications such as multi-receiver file transfer. Overview Multicast is a network addressing method for the delivery of information to a group of destinations simultaneously using the most efficient strategy to deliver the messages over each link of the network only once, creating copies only when the links to the multiple destinations split (typically network switches and routers). However, like the User Datagram Protocol, multicast does not guarantee the delivery of a message stream. Messages may be dropped, delivered multiple times, or delivered out of order. A reliable multicast protocol adds the ability for receivers to detect lost and/or out-of-order messages and take corrective action (similar in principle to TCP), resulting in a gap-free, in-order message stream. Reliability The exact meaning of ''re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ken Birman
Kenneth P. Birman (born November 18, 1955) is a professor in the Department of Computer Science at Cornell University. He currently holds the N. Rama Rao Chair in Computer Science. Education Birman received his B.S. from Columbia University and Ph.D. from University of California, Berkeley. Research and publications Birman's research is mainly concerned with scalability of distributed systems, security technologies, and system management tools employed in cloud computing. An ACM Fellow and IEEE Fellow, Birman was Editor in Chief of ''ACM Transactions on Computer Systems'' from 1993-1998. He is also the author of several books, most recently ''Reliable Distributed Computing: Technologies, Web Services, and Applications'', published by Springer-Verlag in May 2007. Virtual Synchrony, Derecho, and the Isis Toolkit He is best known for developing the Isis Toolkit, which introduced the virtual synchrony execution model for multicast communication. Birman founded Isis Distribute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leslie Lamport
Leslie B. Lamport (born February 7, 1941 in Brooklyn) is an American computer scientist and mathematician. Lamport is best known for his seminal work in distributed systems, and as the initial developer of the document preparation system LaTeX and the author of its first manual. Lamport was the winner of the 2013 Turing Award for imposing clear, well-defined coherence on the seemingly chaotic behavior of distributed computing systems, in which several autonomous computers communicate with each other by passing messages. He devised important algorithms and developed formal modeling and verification protocols that improve the quality of real distributed systems. These contributions have resulted in improved correctness, performance, and reliability of computer systems. Early life and education Lamport was born into a Jewish family in Brooklyn, New York, the son of Benjamin and Hannah Lamport (née Lasser). His father was an immigrant from Volkovisk in the Russian Empire (now Vawkav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anita Borg
Anita Borg (January 17, 1949 – April 6, 2003) was an American computer scientist. She founded the Institute for Women and Technology and the Grace Hopper Celebration of Women in Computing. Education and early life Borg was born Anita Borg Naffz in Chicago, Illinois. She grew up in Palatine, Illinois; Kaneohe, Hawaii; and Mukilteo, Washington. Borg got her first programming job in 1969. Although she loved math while growing up, she did not originally intend to go into computer science and taught herself to program while working at a small insurance company. She was awarded a PhD in Computer Science by New York University in 1981 for research investigating the synchronization efficiency of operating systems supervised by Robert Dewar and Gerald Belpaire. She died because of brain cancer, in Sonoma, California, on 6 April 2003. Career After receiving her PhD, Borg spent four years building a fault tolerant Unix-based operating system, first for Auragen Systems Corp. of New J ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paxos Algorithm
Paxos ( gr, Παξός) is a Greek island in the Ionian Sea, lying just south of Corfu. As a group with the nearby island of Antipaxos and adjoining islets, it is also called by the plural form Paxi or Paxoi ( gr, Παξοί, pronounced in English and in Greek). The main town and the seat of the municipality is Gaios. The smallest of the seven main Ionian Islands (the Heptanese), Paxos has an area of , while the municipality has an area of and a population of about 2300. Paxos lies some 15 km from the southern tip of Corfu, and at about the same distance from the town of Parga on the mainland. It is connected by ferry lines from Igoumenitsa and Corfu (city), Corfu with Gaios. The island is hilly, the highest point having an elevation of 230 m. In Greek mythology, Poseidon created the island by striking Corfu with his trident, so that he and his wife Amphitrite could have some peace and quiet. History Although it was possibly inhabited from prehistoric times, the Ph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
System Failure
A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its environment, is described by its boundaries, structure and purpose and expressed in its functioning. Systems are the subjects of study of systems theory and other systems sciences. Systems have several common properties and characteristics, including structure, function(s), behavior and interconnectivity. Etymology The term ''system'' comes from the Latin word ''systēma'', in turn from Greek ''systēma'': "whole concept made of several parts or members, system", literary "composition"."σύστημα" Henry George Liddell, Robert Scott, '' |
Joining
Join may refer to: * Join (law), to include additional counts or additional defendants on an indictment *In mathematics: ** Join (mathematics), a least upper bound of sets orders in lattice theory ** Join (topology), an operation combining two topological spaces ** Join (sigma algebra), a refinement of sigma algebras ** Join (algebraic geometry), a union of lines between two varieties *In computing: ** Join (relational algebra), a binary operation on tuples corresponding to the relation join of SQL *** Join (SQL), relational join, a binary operation on SQL and relational database tables *** join (Unix), a Unix command similar to relational join ** Join-calculus, a process calculus developed at INRIA for the design of distributed programming languages *** Join-pattern, generalization of Join-calculus *** Joins (concurrency library), a concurrent computing API from Microsoft Research * Join Network Studio of NENU, a non-profit organization of Northeast Normal University * Joins.com, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
