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System Design
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Messaging & Queues
Working
An event must be delivered to several independent subscriber services (search indexer, analytics, email), each of which needs its own copy. Which messaging model fits, versus a single shared work queue?
A
A publish/subscribe (fan-out) model, where each subscriber gets its own copy of every event
B
A competing-consumers work queue, where each message is handled by exactly one consumer
C
A LIFO stack so the newest event is always processed first
D
A request/response RPC call to each service in sequence
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