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1.5 Error Handling / Delivery Semantics
This KIP integrates with KIP-1191. In Share Group mode, Connect uses `AcknowledgeType.REJECT` for fatal errors and relies on the broker-side DLQ configured by KIP-1191. Retriable failures use `AcknowledgeType.RELEASE`. If a DLQ is configured for the share group, the broker is the single source of DLQ records; Connect does not emit its own DLQ records in this mode.
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