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Elixir Tutorial: Using Named Processes for Stable Service Addresses in Distributed Systems

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A technical tutorial series on building distributed systems in Elixir has released its sixth installment, focusing on named processes as a solution to a key limitation of process IDs (PIDs). Because PIDs identify only a single running instance of a process, they become invalid when a worker crashes and is replaced by a supervisor, breaking any client holding the old PID. The article demonstrates how Process.register/2 and Process.whereis/1 allow developers to bind a stable atom name, such as :worker, to a process so clients can send messages by name rather than by PID. It also covers :global.register_name/2 and :global.whereis_name/1 for cross-node name resolution, contrasting them with node-local registration. The tutorial deliberately avoids higher-level abstractions like GenServer and OTP Registry, aiming to build foundational understanding of the lookup problem that such tools are designed to solve.

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Elixir Tutorial: Using Named Processes for Stable Service Addresses in Distributed Systems · ShortSingh