Distributed computing
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Overview[edit | edit source]
Distributed computing is a field of computer science that studies distributed systems. A distributed system is a model in which components located on networked computers communicate and coordinate their actions by passing messages. The components interact with each other in order to achieve a common goal.
Distributed computing is a form of parallel computing, but it is distinguished by the fact that the computers in a distributed system are autonomous and communicate over a network. This contrasts with parallel computing, where the processors are tightly coupled and share memory.
Characteristics[edit | edit source]
Distributed computing systems have several key characteristics:
- Concurrency of components: Multiple components can operate concurrently, which can lead to increased efficiency and performance.
- Lack of a global clock: Distributed systems do not have a single global clock, which can complicate synchronization.
- Independent failure of components: Components in a distributed system can fail independently, which requires robust fault-tolerance mechanisms.
Types of Distributed Systems[edit | edit source]
Distributed systems can be classified into several types based on their architecture and application:
- Client-server systems: In this model, clients request services and servers provide them. Examples include web servers and database servers.
- Peer-to-peer systems: In this model, each node can act as both a client and a server. Examples include file-sharing networks like BitTorrent.
- Grid computing: This involves a collection of distributed computing resources that are coordinated to solve a large problem.
- Cloud computing: This is a model where computing resources are provided as a service over the internet.
Applications[edit | edit source]
Distributed computing is used in a wide range of applications, including:
- Scientific computing: Distributed systems are used to solve complex scientific problems that require significant computational power.
- Data processing: Systems like Apache Hadoop and Apache Spark are used for processing large datasets across distributed clusters.
- Web services: Distributed computing underpins the architecture of modern web services, enabling scalability and reliability.
Challenges[edit | edit source]
Distributed computing presents several challenges, including:
- Network latency: Communication over a network introduces latency, which can affect performance.
- Security: Ensuring secure communication and data integrity in a distributed system is complex.
- Consistency: Maintaining consistency across distributed components can be difficult, especially in the presence of network partitions.
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