|
Rendezvous Hashing
Rendezvous or highest random weight (HRW) hashing is an algorithm that allows clients to achieve distributed agreement on a set of k options out of a possible set of n options. A typical application is when clients need to agree on which sites (or proxies) objects are assigned to. Consistent hashing addresses the special case k = 1 using a different method. Rendezvous hashing is both much simpler and more general than consistent hashing (see below). History Rendezvous hashing was invented by David Thaler and Chinya Ravishankar at the University of Michigan in 1996. Consistent hashing appeared a year later in the literature. Given its simplicity and generality, rendezvous hashing is now being preferred to consistent hashing in real-world applications. Rendezvous hashing was used very early on in many applications including mobile caching, router design, secure key establishment, and Shard (database architecture), sharding and distributed databases. Other examples of real-wor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rendezvous Hash Schematic
Rendezvous or rendez-vous may refer to: Arts and entertainment Film and television * The Rendezvous (1923 film), ''The Rendezvous'' (1923 film), a silent film adventure melodrama * Rendezvous (1930 film), ''Rendezvous'' (1930 film), a German musical directed by Carl Boese * Rendezvous (1935 film), ''Rendezvous'' (1935 film), a spy film set in World War I * Rendezvous (1952 TV series), ''Rendezvous'' (1952 TV series), an American TV series starring Ilona Massey as a spy * Rendezvous (TV series), ''Rendezvous'' (TV series), a 1957 anthology series, later retitled ''Schilling Playhouse'' * The Rendezvous (1972 film), ''The Rendezvous'' (1972 film), a Japanese film * ''C'était un rendez-vous'', a 1976 French short film by Claude Lelouch * Rendez-vous (1985 film), ''Rendez-vous'' (1985 film), a French drama * Alias (TV series), "Rendezvous" (''Alias''), a 2002 television episode * Rendezvous (Prison Break), "Rendezvous" (''Prison Break''), a 2006 television episode * ''The Rend ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Load Balancing (computing)
In computing, load balancing is the process of distributing a set of tasks over a set of resources (computing units), with the aim of making their overall processing more efficient. Load balancing can optimize response time and avoid unevenly overloading some compute nodes while other compute nodes are left idle. Load balancing is the subject of research in the field of parallel computers. Two main approaches exist: static algorithms, which do not take into account the state of the different machines, and dynamic algorithms, which are usually more general and more efficient but require exchanges of information between the different computing units, at the risk of a loss of efficiency. Problem overview A load-balancing algorithm always tries to answer a specific problem. Among other things, the nature of the tasks, the algorithmic complexity, the hardware architecture on which the algorithms will run as well as required error tolerance, must be taken into account. Therefore com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Algorithms
In mathematics and computer science, an algorithm () is a finite sequence of mathematically rigorous instructions, typically used to solve a class of specific problems or to perform a computation. Algorithms are used as specifications for performing calculations and data processing. More advanced algorithms can use conditionals to divert the code execution through various routes (referred to as automated decision-making) and deduce valid inferences (referred to as automated reasoning). In contrast, a heuristic is an approach to solving problems without well-defined correct or optimal results.David A. Grossman, Ophir Frieder, ''Information Retrieval: Algorithms and Heuristics'', 2nd edition, 2004, For example, although social media recommender systems are commonly called "algorithms", they actually rely on heuristics as there is no truly "correct" recommendation. As an effective method, an algorithm can be expressed within a finite amount of space and time"Any classic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hash Function
A hash function is any Function (mathematics), function that can be used to map data (computing), data of arbitrary size to fixed-size values, though there are some hash functions that support variable-length output. The values returned by a hash function are called ''hash values'', ''hash codes'', (''hash/message'') ''digests'', or simply ''hashes''. The values are usually used to index a fixed-size table called a ''hash table''. Use of a hash function to index a hash table is called ''hashing'' or ''scatter-storage addressing''. Hash functions and their associated hash tables are used in data storage and retrieval applications to access data in a small and nearly constant time per retrieval. They require an amount of storage space only fractionally greater than the total space required for the data or records themselves. Hashing is a computationally- and storage-space-efficient form of data access that avoids the non-constant access time of ordered and unordered lists and s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IBM Cloud Object Storage
IBM Cloud Object Storage is a service offered by IBM for storing and accessing unstructured data. The object storage service can be deployed on-premises, as part of IBM Cloud Platform offerings, or in hybrid form. The offering can store any type of object which allows for uses like data archiving and backup, web and mobile applications, and as scalable, persistent storage for analytics. Interaction with Cloud Object Storage is based on Rest APIs. Design IBM Cloud Object Storage stores objects that are organized into buckets (as S3 does) identified within each bucket by a unique, user-assigned key. All requests are authorized using an access control list associated with each bucket and object. Bucket names and keys are chosen so that objects are addressable using HTTP URLs. Features IBM Cloud Object Storage offers different storage classes, identical in data protection, security, durability and resiliency. The classes differ in data pattern and availability needs. History The of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ceph (software)
Ceph (pronounced ) is a Free software, free and open-source software, open-source software-defined Computer data storage, storage computing platform, platform that provides object storage, Block-level_storage, block storage, and File system, file storage built on a common computer cluster, distributed cluster foundation. Ceph provides distributed operation without a single point of failure and scalability to the exabyte level. Since version 12 (Luminous), Ceph does not rely on any other conventional filesystem and directly manages Hard disk drive, HDDs and Solid-state drive, SSDs with its own storage backend BlueStore and can expose a POSIX filesystem. Ceph replication (computer science), replicates data with fault tolerance, using commodity hardware and Ethernet IP and requiring no specific hardware support. Ceph is High_availability, highly available and ensures strong data durability through techniques including replication, Erasure_code, erasure coding, snapshots and clones. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reduction (complexity)
In computability theory and computational complexity theory, a reduction is an algorithm for transforming one problem into another problem. A sufficiently efficient reduction from one problem to another may be used to show that the second problem is at least as difficult as the first. Intuitively, problem ''A'' is reducible to problem ''B'', if an algorithm for solving problem ''B'' efficiently (if it exists) could also be used as a subroutine to solve problem ''A'' efficiently. When this is true, solving ''A'' cannot be harder than solving ''B''. "Harder" means having a higher estimate of the required computational resources in a given context (e.g., higher time complexity, greater memory requirement, expensive need for extra hardware processor cores for a parallel solution compared to a single-threaded solution, etc.). The existence of a reduction from ''A'' to ''B'' can be written in the shorthand notation ''A'' ≤m ''B'', usually with a subscript on the ≤ to indicate the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dynamo (storage System)
Dynamo is a set of techniques that together can form a highly available key-value structured storage system or a distributed data store. It has properties of both databases and distributed hash tables (DHTs). It was created to help address some scalability issues that Amazon experienced during the holiday season of 2004. By 2007, it was used in Amazon Web Services, such as its Simple Storage Service (S3). Relationship to DynamoDB Amazon DynamoDB is "built on the principles of Dynamo" and is a hosted service within the AWS infrastructure. However, while Dynamo is based on leaderless replication, DynamoDB uses single-leader replication. Principles * Incremental scalability: Dynamo should be able to scale out one storage host (or “node”) at a time, with minimal impact on both operators of the system and the system itself. * Symmetry: Every node in Dynamo should have the same set of responsibilities as its peers; there should be no distinguished node or nodes that tak ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rendezvous Hashing Skeleton, Animated
Rendezvous or rendez-vous may refer to: Arts and entertainment Film and television * ''The Rendezvous'' (1923 film), a silent film adventure melodrama * ''Rendezvous'' (1930 film), a German musical directed by Carl Boese * ''Rendezvous'' (1935 film), a spy film set in World War I * ''Rendezvous'' (1952 TV series), an American TV series starring Ilona Massey as a spy * ''Rendezvous'' (TV series), a 1957 anthology series, later retitled ''Schilling Playhouse'' * ''The Rendezvous'' (1972 film), a Japanese film * ''C'était un rendez-vous'', a 1976 French short film by Claude Lelouch * ''Rendez-vous'' (1985 film), a French drama * "Rendezvous" (''Alias''), a 2002 television episode * "Rendezvous" (''Prison Break''), a 2006 television episode * ''The Rendez-Vous'', a 2015 Dutch film starring Loes Haverkort and Pierre Boulanger * ''The Rendezvous'' (2016 film), an American action-adventure film * ''Rendezvous'' (2019 film), an American short suspense-thriller Music ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hit Rate
Hit rate is a metric or measure of business performance traditionally associated with sales Sales are activities related to selling or the number of goods sold in a given targeted time period. The delivery of a service for a cost is also considered a sale. A period during which goods are sold for a reduced price may also be referred .... It is defined as the number of sales of a product divided by the number of customers who go online, planned call, or visit a company to find out about the product. Sales can be measured either as the sum of dollars pursued or the number of deals pursued. Accurate calculation requires clear definition of when a sales opportunity is firm enough to be included in the metric, as well as firm disposition of the opportunity (i.e. the deal has reached a point where it is considered won, lost or abandoned). The hit rate may be measured for the whole sales force or by sales region, sales person or product group. It may be used to benchmark the diff ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
