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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] |
Computer Networking
A computer network is a set of computers sharing resources located on or provided by network nodes. The computers use common communication protocols over digital interconnections to communicate with each other. These interconnections are made up of telecommunication network technologies, based on physically wired, optical, and wireless radio-frequency methods that may be arranged in a variety of network topologies. The nodes of a computer network can include personal computers, servers, networking hardware, or other specialised or general-purpose hosts. They are identified by network addresses, and may have hostnames. Hostnames serve as memorable labels for the nodes, rarely changed after initial assignment. Network addresses serve for locating and identifying the nodes by communication protocols such as the Internet Protocol. Computer networks may be classified by many criteria, including the transmission medium used to carry signals, bandwidth, communications protocols ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vsync (computing)
The Vsync software library is a BSD-licensed open source library written in C# for the .NET platform, providing a wide variety of primitives for fault-tolerant distributed computing, including: state machine replication, virtual synchrony process groups, atomic broadcast with several levels of ordering and durability, a distributed lock manager, persistent replicated data, a distributed key-value store (also called a Distributed Hash Table or DHT), and scalable aggregation. The system implements the virtual synchrony execution model, and includes an implementation of Leslie Lamport's Paxos Protocol. The main author is Ken Birman, a Professor of Computer Science at Cornell University, and it is the fourth in a series of Cornell-developed software libraries for reliable multicast. The first was the Isis Toolkit, developed in 1985 and ultimately used in the New York Stock Exchange, the French Air Traffic Control System, the US Navy AEGIS and other settings. Subsequent gen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Distributed Algorithms
A distributed algorithm is an algorithm designed to run on computer hardware constructed from interconnected processors. Distributed algorithms are used in different application areas of distributed computing, such as telecommunications, scientific computing, distributed information processing, and real-time process control. Standard problems solved by distributed algorithms include leader election, consensus, distributed search, spanning tree generation, mutual exclusion, and resource allocation. Distributed algorithms are a sub-type of parallel algorithm, typically executed concurrently, with separate parts of the algorithm being run simultaneously on independent processors, and having limited information about what the other parts of the algorithm are doing. One of the major challenges in developing and implementing distributed algorithms is successfully coordinating the behavior of the independent parts of the algorithm in the face of processor failures and unreliable communica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fault-tolerant Computer Systems
Fault tolerance is the property that enables a system to continue operating properly in the event of the failure of one or more faults within some of its components. If its operating quality decreases at all, the decrease is proportional to the severity of the failure, as compared to a naively designed system, in which even a small failure can cause total breakdown. Fault tolerance is particularly sought after in high-availability, mission-critical, or even life-critical systems. The ability of maintaining functionality when portions of a system break down is referred to as graceful degradation. A fault-tolerant design enables a system to continue its intended operation, possibly at a reduced level, rather than failing completely, when some part of the system fails. The term is most commonly used to describe computer systems designed to continue more or less fully operational with, perhaps, a reduction in throughput or an increase in response time in the event of some partial f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inter-process Communication
In computer science, inter-process communication or interprocess communication (IPC) refers specifically to the mechanisms an operating system provides to allow the processes to manage shared data. Typically, applications can use IPC, categorized as clients and servers, where the client requests data and the server responds to client requests. Many applications are both clients and servers, as commonly seen in distributed computing. IPC is very important to the design process for microkernels and nanokernels, which reduce the number of functionalities provided by the kernel. Those functionalities are then obtained by communicating with servers via IPC, leading to a large increase in communication when compared to a regular monolithic kernel. IPC interfaces generally encompass variable analytic framework structures. These processes ensure compatibility between the multi-vector protocols upon which IPC models rely. An IPC mechanism is either synchronous or asynchronous. Synchr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
JGroups
JGroups is a library for reliable one-to-one or one-to-many communication written in the Java language. It can be used to create groups of processes whose members send messages to each other. JGroups enables developers to create reliable multipoint (multicast) applications where reliability is a deployment issue. JGroups also relieves the application developer from implementing this logic themselves. This saves significant development time and allows for the application to be deployed in different environments without having to change code. Features * Group creation and deletion. Group members can be spread across LANs or WANs * Joining and leaving of groups * Membership detection and notification about joined/left/crashed members * Detection and removal of crashed members * Sending and receiving of member-to-group messages (point-to-multipoint) * Sending and receiving of member-to-member messages (point-to-point) Code sample This code below demonstrates the implementat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SMART Multicast
SMART Multicast is an experimental method of Secure Reliable IP Multicast. It allows a user to forward IP datagrams to an unlimited group of receivers. See the article on multicast for a general discussion of this subject - this article is specifically about SMART IP Multicast. SMART Multicast Uses IP Multicast has been successfully deployed in private and controlled networking environments, for example; IP over fiber - cable TV operators, educational institutions with significant on-campus student housing and financial sector applications such as stock tickers and hoot-n-holler systems. However, IP multicast has been slow to be adopted in the interdomain routing environment. This is because the current interdomain infrastructure lacks the necessary tools to efficiently handle packet loss and the security needed to create a functional business model. SMART IP Multicast is an experimental protocol that enables the interdomain transmission of Secure Reliable IP Multicast, thus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scalable Reliable Multicast
A Scalable Reliable Multicast protocol is a reliable multicast framework for light-weight sessions and application level framing. The algorithms of this framework are efficient, robust, and scale well to both very large networks and very large sessions. Wb, the distributed whiteboard tool designed and implemented by McCanne and Jacobson, is the first application based on the Scalable Reliable Multicast framework. Overview Scalable Reliable Multicast is heavily based on the group delivery model that is the centerpiece of the IP multicast protocol. It attempts to follow the core design principles of transmission control protocol/Internet protocol (TCP/IP). It requires only the basic IP delivery model with possible duplication and reordering of packets and builds reliability on an end-to-end basis. The algorithms in Scalable Reliable Multicast dynamically adjust their control parameters based on the observed performance within a session like transmission control protocol adaptively s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Data Distribution Service
The Data Distribution Service (DDS) for real-time systems is an Object Management Group (OMG) machine-to-machine (sometimes called middleware or connectivity framework) standard that aims to enable dependable, high-performance, interoperable, real-time, scalable data exchanges using a publish–subscribe pattern. DDS addresses the needs of applications like aerospace and defense, air-traffic control, autonomous vehicles, medical devices, robotics, power generation, simulation and testing, smart grid management, transportation systems, and other applications that require real-time data exchange. Architecture Model DDS is a networking middleware that simplifies complex computer network programming, network programming. It implements a publish–subscribe pattern for sending and receiving data, events, and commands among the node (networking), nodes. Nodes that produce information (publishers) create "topics" (e.g., temperature, location, pressure) and publish "samples". DDS d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Talarian
Talarian was a provider of real-time infrastructure software. Now part of TIBCO, it was a veteran provider of message-oriented middleware. Talarian was a member of the Business Integration Group (BIG), the Internet Protocol Multicast Initiative (IPMI), the Securities Industry Middleware Council (SIMC), the Object Management Group (OMG), and the Internet Engineering Task Force (IETF). SmartSockets SmartSockets was the main product of Talarian. It is a real-time message-oriented middleware (MOM) which is scalable and fault tolerant. Its programming model is built specifically to offer high-speed interprocess communication (IPC) for multiprocessor architecture, scalability and reliability. It supports a variety of communication paradigms including publish-subscribe, adaptive multicast, redundant connections, peer-to-peer, and RPC. Included as part of the SmartSockets package are graphical tools for monitoring and debugging applications. It is supported on a wide range of p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TIBCO Rendezvous
TIBCO Rendezvous is a software product that provides a message bus for enterprise application integration (EAI). Details TIBCO provides messaging APIs in C, C++, Java, Visual Basic, Perl and .NET to provide messaging between two or more services. The basic message passing is conceptually simple: * A message has a single subject composed of elements separated by periods. A message is sent to a single Rendezvous Daemon Daimon or Daemon (Ancient Greek: , "god", "godlike", "power", "fate") originally referred to a lesser deity or guiding spirit such as the daimons of ancient Greek religion and mythology and of later Hellenistic religion and philosophy. The word ... (though it may end up being broadcast onto Daemons). * A listener announces its subjects of interest to a Daemon (with a basic wildcard facility) and messages with matching subjects are delivered to it if the two daemons are 'connected' to each other (or indeed the same daemon). Considerable "Enterprise" functiona ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tibco Software
TIBCO Software Inc. is an American business intelligence software company founded in 1997 in Palo Alto, California. It has headquarters in Palo Alto, California, and offices in North America, Europe, Asia, the Middle East, Africa and South America. Its Palo Alto campus consists of four buildings on 16 acres in Palo Alto's Stanford Research Park. History In 1997, Vivek Ranadivé, who had previously founded and sold Teknekron Software Systems, Inc,Black, Debra (January 26, 2012)"Davos Elite Get Their Own Facebook Move Over Twitter and Facebook There's a New Platform in Town: It's Called TopCom and It's Geared to the World's Leaders" ''Toronto Star''. Retrieved July 19, 2013. founded TIBCO (The Information Bus Company) as a subsidiary of Reuters Holdings, which was then a new venture firm, with financial backing from Cisco Systems. The bus software allowed communication within the financial markets to happen in real-time and without human intervention. The technology was used ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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