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| Header name | Description |
|---|---|
__dlq.errors.topic | The name of the topic that contained the original record. |
__dlq.errors.partition | The partition that contains the original record (encoded as a UTF-8 string). |
__dlq.errors.offset | The offset of the original record (encoded as a UTF-8 string). |
__dlq.errors.group | If known, the group ID of the delivery of the original record. |
__dlq.errors.delivery.count | If known, the delivery count of the original record (encoded as a UTF-8 string). |
__dlq.errors.message | The reason for the original record's delivery failure. |
Additionally, the broker can include the header, key and value of the original record in the DLQ record, but that takes additional configuration because copying the original record duplicates its content which may be undesirable in performance or security terms.
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| Configuration | Description | Values |
|---|---|---|
errors.deadletterqueue.topic.name | The name of the topic to be used as the dead-letter queue (DLQ) for undeliverable records. The topic name is blank by default, which means that there is no DLQ topic for this group. | Type: string, default: "", must not start with double underscore "_ _" to ensure that internal topics are not mistakenly used as DLQ topics |
errors.deadletterqueue.copy.record.enable | Whether to copy the record onto the dead-letter queue topic, or just to write a record containing the context information headers. | Type: boolean, default: false |
Topic configuration
| Configuration | Description | Values |
|---|---|---|
errors.deadletterqueue.group.enable | Whether the topic can be used as a DLQ topic for groups. | Type: boolean, default: false |
Records
This KIP defines a new DeliveryState of Archiving with the value of 3 which indicates a record which is in the process of being written to the dead-letter queue topic. As the details of the implementation develop, it will become clear whether this value is written to the share-group state topic, or just a state in memory like Acquired. The KIP reserves it for potential use in the existing share coordinator record schemas.
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