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docs(source/kafka): state the post-drain settle disposition #209

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joshua-temple merged 1 commit into from
Aug 23, 2026
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docs(source/kafka): state the post-drain settle disposition #209

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5 changes: 5 additions & 0 deletions source/kafka/README.md
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Expand Up @@ -88,6 +88,11 @@ do expose it:
- `Transactional` — Kafka exactly-once consume-process-produce, available when
the inlet is built with `WithTransactional()`.

**Post-drain settles:** settling a genuine Kafka record after this
subscription drained applies it as if delivered — a duplicate mark is
harmless (broker-idempotent) and accounting cannot go negative — while a
non-Kafka message is rejected where detectable.

`BlockRebalanceOnPoll` gives the engine a safe processing window: a rebalance
cannot move partitions mid-batch; the subscription releases the rebalance only
between fetches. A `NakAfter(d)` pause holds that window for at most `d` per
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