System Design Patterns: From Fundamentals to Real Systems

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Partitioned Consumption

The Pattern

Split the stream into partitions by key: every event for a given key lands in the same partition, each partition is consumed by exactly one consumer at a time, and order holds strictly within a partition. The contract: order per key, parallelism across keys. Each mail carrier gets their own route's mail: in order: and more routes means more carriers.

This lesson formalizes a deal the course has been making informally for eight modules. The [queue lesson's Q3](

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