hard20 pts · first answer countskafkaordering

Adding partitions to a keyed topic

A topic keyed by order_id has 12 partitions, and consumers rely on all events for an order being in order. You increase it to 24 partitions. What is the risk?

A.Old messages are deletedB.New events for an existing order_id may go to a different partition than its earlier events, so per-key ordering can break during the transitionC.Kafka rejects keyed messages after the changeD.Consumers can no longer use consumer groups

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Adding partitions to a keyed topic

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