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== Distributed Systems in Erlang == === Introduction === Erlang is a functional programming language that was specifically designed for building highly distributed, fault-tolerant systems. Its concurrency model and lightweight processes make it an ideal choice for developing distributed systems. In this article, we will explore the key features and concepts of distributed systems in Erlang. === Concurrency and Lightweight Processes === Erlang's concurrency model is based on a unique concept of lightweight processes, also known as "actors." Lightweight processes are extremely lightweight compared to operating system processes, allowing thousands or even millions of concurrent processes to run on a single Erlang runtime system. These processes communicate with each other by message passing, which enables isolated execution and eliminates shared state concurrency issues. === Distribution and Communication === Erlang provides built-in support for distribution, allowing processes to be distributed across multiple Erlang nodes. Nodes can communicate with each other transparently by sending and receiving messages. === Clustering === In Erlang, multiple nodes can be clustered together to form a logical unit for distributed system development. A cluster allows processes on different nodes to interact as if they were running on the same node. Clustering is a fundamental concept for building fault-tolerant, scalable, and highly available distributed systems. === Failure Detection and Recovery === Erlang's distributed systems framework includes built-in failure detection and recovery mechanisms. If a node fails or becomes unreachable, the system automatically detects the failure and redistributes the work to other available nodes. This ensures fault tolerance and high availability of the distributed system. === Distributed Data Storage === Erlang provides several mechanisms for distributed data storage, including Mnesia and Riak Core. Mnesia is a distributed, soft real-time database management system built on top of Erlang's distributed systems capabilities. Riak Core is a distributed systems framework that allows developers to build their own distributed storage systems. === Scalability and Load Balancing === Erlang's lightweight processes and distributed systems architecture make it inherently scalable. By distributing processes across multiple nodes and utilizing load balancing algorithms, Erlang can handle high loads and scale smoothly as the system grows. === Consistency and Reliability === Distributed systems in Erlang prioritize consistency and reliability. Erlang's message passing paradigm ensures that messages are delivered in the order they were sent, maintaining consistency in communication. The built-in fault-tolerance mechanisms guarantee that distributed systems can continue operating even in the face of failures. === Conclusion === In this article, we have explored the fundamental concepts and features of distributed systems in Erlang. Erlang's concurrency model, distribution capabilities, clustering, failure detection, and recovery mechanisms make it a powerful tool for developing fault-tolerant and scalable distributed systems. With its focus on consistency, reliability, and ease of development, Erlang is an excellent choice for building robust and highly available distributed systems. == See Also == * [[Concurrency in Erlang]] * [[Fault Tolerance in Erlang]] * [[Scalability in Erlang]] * [[Message Passing in Erlang]] * [[Distributed Data Storage in Erlang]]
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