KIP-385 — Avoid throwing away prefetched data

Discussion Consumer

Proposes that the consumer retains prefetched fetch responses across pause() calls instead of discarding them, so data already transferred is not re-fetched when the partition is resumed. When using the pause/resume API, the consumer currently discards any in-flight prefetch for paused partitions, wasting network bandwidth by re-fetching the same data after resume.

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