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Raft (algorithm)
Raft is a consensus algorithm designed as an alternative to the Paxos family of algorithms. It was meant to be more understandable than Paxos by means of separation of logic, but it is also formally proven safe and offers some additional features. Raft offers a generic way to distribute a state machine across a cluster of computing systems, ensuring that each node in the cluster agrees upon the same series of state transitions. It has a number of open-source reference implementations, with full-specification implementations in Go, C++, Java, and Scala. It is named after Reliable, Replicated, Redundant, And Fault-Tolerant. Raft is not a Byzantine fault tolerant (BFT) algorithm; the nodes trust the elected leader. Basics Raft achieves consensus via an elected leader. A server in a raft cluster is either a ''leader'' or a ''follower'', and can be a ''candidate'' in the precise case of an election (leader unavailable). The leader is responsible for log replication to the f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Consensus Algorithm
A fundamental problem in distributed computing and multi-agent systems is to achieve overall system reliability in the presence of a number of faulty processes. This often requires coordinating processes to reach consensus, or agree on some data value that is needed during computation. Example applications of consensus include agreeing on what transactions to commit to a database in which order, state machine replication, and atomic broadcasts. Real-world applications often requiring consensus include cloud computing, clock synchronization, PageRank, opinion formation, Smart grid, smart power grids, state estimation, Unmanned aerial vehicle, control of UAVs (and multiple robots/agents in general), Load balancing (computing), load balancing, blockchain, and others. Problem description The consensus problem requires agreement among a number of processes (or agents) on a single data value. Some of the processes (agents) may fail or be unreliable in other ways, so consensus protocols mu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neo4j
Neo4j is a graph database management system (GDBMS) developed by Neo4j Inc. The data elements Neo4j stores are nodes, edges connecting them, and attributes of nodes and edges. Described by its developers as an ACID-compliant transactional database with native graph storage and processing, Neo4j is available in a non-open-source "community edition" licensed with a modification of the GNU General Public License, with online backup and high availability extensions licensed under a closed-source commercial license. Neo also licenses Neo4j with these extensions under closed-source commercial terms. Neo4j is implemented in Java and accessible from software written in other languages using the Cypher query language through a transactional HTTP endpoint, or through the binary " Bolt" protocol. The "4j" in Neo4j is a reference to its being built in Java, however is now largely viewed as an anachronism. History Neo4j is developed by Neo4j, Inc., based in San Mateo, California, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Camunda
Camunda is a process orchestration platform used to control complex business processes for enterprise companies. The software is classified by specialist media as a business process automation tool or digital process automation software and therefore represents a further development of the classic workflow management platform. Overview Process orchestration is the main topic at the biannual CamundaCon (formerly BPM Con) /sup>, which is organized by Camunda. Other conferences such as JAX (and W-JAX) or Devoxx are also regularly dedicated to the topic. History Camunda 7 is an originally commercial workflow management system, which was based on Activiti, a free business process management system. Alongside Alfresco, Camunda was one of the biggest contributors of Activiti. On 18 March 2013, the further development of Camunda was spun off from the development of Activiti. Features Camunda consists of a number of components and applications that are used together to define an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NATS Messaging
NATS is an open-source messaging system (sometimes called message-oriented middleware). The NATS server is written in the Go programming language. Client libraries to interface with the server are available for dozens of major programming languages. The core design principles of NATS are performance, scalability, and ease of use. The acronym NATS stands for Neural Autonomic Transport System. NATS is an open source project under the stewardship of CNCF. NATS was originally developed bDerek Collisonas the messaging control plane for Cloud Foundry and was written in Ruby. NATS was later ported to Go. The source code is released under the Apache 2.0 License. NATS consists of: * ThNATS Server- The core Publish-Subscribe Server for NATS. Client librariesfor a variety of programming languages. * connector framework- a pluggable Java based framework to connect NATS and other services. NATS is a CNCF project with Kubernetes and Prometheus integration. The NATS server is often referre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apache Kafka
Apache Kafka is a distributed event store and stream-processing platform. It is an open-source system developed by the Apache Software Foundation written in Java and Scala. The project aims to provide a unified, high-throughput, low-latency platform for handling real-time data feeds. Kafka can connect to external systems (for data import/export) via Kafka Connect, and provides the Kafka Streams libraries for stream processing applications. Kafka uses a binary TCP-based protocol that is optimized for efficiency and relies on a "message set" abstraction that naturally groups messages together to reduce the overhead of the network roundtrip. This "leads to larger network packets, larger sequential disk operations, contiguous memory blocks ..which allows Kafka to turn a bursty stream of random message writes into linear writes." History Kafka was originally developed at LinkedIn, and was subsequently open sourced in early 2011. Jay Kreps, Neha Narkhede and Jun Rao helped co-crea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ZooKeeper
A zookeeper, sometimes referred as animal keeper, is a person who manages zoo animals that are kept in captivity for conservation or to be displayed to the public.Hurwitz, Jane. Choosing a Career in Animal Care (World of Work). New York: Rosen Group, 2001. They are usually responsible for the feeding and daily care of the animals. As part of their routine, the zookeepers may clean the exhibits and report health problems. They may also be involved in Research, scientific research or public education, such as conducting tours and answering questions. Background Animal collections requiring wild animal care takers or zookeepers have existed since about 3,000 Anno Domini, B.C.Kisling, Vernon N. JrHistory of the Zoo Keeper Profession. Early civilizations in Mesopotamia (present day Iraq), Egypt, China and India allowed rulers and the wealthy class citizens to keep collections of wild animals. These civilizations had individuals who caught and cared for wild animals such as fish and b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ClickHouse
ClickHouse is an open-source column-oriented DBMS (columnar database management system) for online analytical processing (OLAP) that allows users to generate analytical reports using SQL queries in real-time. ClickHouse Inc. is headquartered in the San Francisco Bay Area with the subsidiary, ClickHouse B.V., based in Amsterdam, Netherlands. In September 2021 in San Francisco, CA, ClickHouse incorporated to house the open source technology with an initial $50 million investment from Index Ventures and Benchmark Capital with participation by Yandex N.V. and others. On October 28, 2021 the company received Series B funding totaling $250 million at a valuation of $2 billion from Coatue Management, Altimeter Capital, and other investors. The company continues to build the open source project and engineering cloud technology. History ClickHouse’s technology was first developed over 10 years ago at Yandex, Russia's largest technology company. In 2009, Alexey Milovidov and developer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
YugabyteDB
YugabyteDB is a high-performance transactional distributed SQL database for cloud-native applications, developed by Yugabyte. History Yugabyte was founded by ex-Facebook engineers Kannan Muthukkaruppan, Karthik Ranganathan, and Mikhail Bautin. At Facebook, they were part of the team that built and operated Cassandra and HBase for workloads such as Facebook Messenger and Facebook's Operational Data Store. The founders came together in February 2016 to build YugabyteDB. YugabyteDB was initially available in two editions: community and enterprise. In July 2019, Yugabyte open-sourced previously commercial features and launched YugabyteDB as open-source under the Apache 2.0 license. Funding In October 2021, five years after the company's inception, Yugabyte closed a $188 Million Series C funding round to become a Unicorn start-up with a valuation of $1.3Bn Architecture YugabyteDB is a distributed SQL database that aims to be strongly transactionally consistent across ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TiDB
TiDB (/’taɪdiːbi:/, "Ti" stands for Titanium) is an open-source NewSQL database that supports Hybrid Transactional and Analytical Processing ( HTAP) workloads. Designed to be MySQL compatible, it is developed and supported primarily by PingCAP and licensed under Apache 2.0. It is also available as a paid product. TiDB drew its initial design inspiration from Google's Spanner and F1 papers. Release history See alTiDB release notes * On December 19, 2024TiDB 8.5 GAwas released. * On May 24, 2024TiDB 8.1 GAwas released. * On December 1, 2023TiDB 7.5 GAwas released. * On May 31, 2023TiDB 7.1 GAwas released. * On April 7, 2022TiDB 6.0 GAwas released. * On April 7, 202TiDB 5.0 GAwas released. * On May 28, 2020TiDB 4.0 GAwas released. * On June 28, 2019TiDB 3.0 GAwas released. * On April 27, 2018TiDB 2.0 GAwas released. * On October 16, 2017TiDB 1.0 GAwas released. Main features Horizontal scalability TiDB can expand both SQL processing and storage capacity by adding new n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Splunk
Splunk Inc. is an American software company based in San Francisco, California, that produces software for searching, monitoring, and analyzing machine-generated data via a web-style interface. Its software helps capture, index and correlate real-time data in a searchable Content repository, repository, from which it can generate graphs, reports, alerts, dashboards and visualizations. The firm uses machine data for identifying Pattern recognition, data patterns, providing metrics, diagnosing problems and providing intelligence for business operations. It is a Horizontal market, horizontal technology used for application management, Information security, security and Compliance (regulation), compliance, as well as business and web analytics. In September 2023, it was announced that Splunk would be acquired by Cisco for $28 billion in an all-cash deal. The transaction was completed on March 18, 2024. History Founding & early years Michael Baum (entrepreneur), Michael Baum, R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ScyllaDB
ScyllaDB is a source-available distributed NoSQL wide-column data store. It was designed to be compatible with Apache Cassandra while achieving significantly higher throughputs and lower latencies. It supports the same protocols as Cassandra ( CQL) and the same file formats (SSTable), but is a completely rewritten implementation, using the C++20 language replacing Cassandra's Java, and the Seastar asynchronous programming library replacing classic Linux programming techniques such as threads, shared memory and mapped files. In addition to implementing Cassandra's protocols, ScyllaDB also implements the Amazon DynamoDB API. ScyllaDB uses a sharded design on each node, meaning that each CPU core handles a different subset of data. Cores do not share data, but rather communicate explicitly when they need to. The ScyllaDB authors claim that this design allows ScyllaDB to achieve much better performance on modern NUMA SMP machines, and to scale very well with the number of cores. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RabbitMQ
RabbitMQ is an open-source message-broker software (sometimes called message-oriented middleware) that originally implemented the Advanced Message Queuing Protocol (AMQP) and has since been extended with a plug-in architecture to support Streaming Text Oriented Messaging Protocol (STOMP), MQ Telemetry Transport (MQTT), and other protocols. Written in Erlang, the RabbitMQ server is built on the Open Telecom Platform framework for clustering and failover. Client libraries to interface with the broker are available for all major programming languages. The source code is released under the Mozilla Public License. Since November 2020, there are commercial offerings available of RabbitMQ, for support and enterprise features: "VMware RabbitMQ OVA", "VMware RabbitMQ" and "VMware RabbitMQ for Kubernetes" (different feature levels) Open-Source RabbitMQ is also packaged by Bitnami and commercially for VMware's Tanzu Application Service. History Originally developed by Rabbit Tec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
