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A Partition Is the Unit of Both Ordering and Parallelism

This is the hinge node of the whole transport sub-domain and one of the two or three most load-bearing nodes in the curation. The outcome names 'which key their data is partitioned by' explicitly, and every scaling move the learner will make — adding consumers, adding capacity, diagnosing a slow consumer — is expressed in partitions. Offsets, consumer groups, capacity ceilings and fan-out all become unstateable without it.