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[improve][doc] Default behaviour with acknowledge timeout #18436

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Nov 12, 2022
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[improve][doc] Default behaviour with acknowledge timeout #18436

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Missing default for acknowledge
AlvaroStream Nov 11, 2022
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Update concepts-messaging.md
AlvaroStream Nov 11, 2022
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6 changes: 6 additions & 0 deletions site2/docs/concepts-messaging.md
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Expand Up @@ -203,6 +203,12 @@ Client libraries provide listener implementation for consumers. For example, the

### Acknowledgment

:::note

By default, the acknowledge timeout is disabled and that means that messages delivered to a consumer will not be re-delivered unless the consumer crashes.

:::
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The consumer sends an acknowledgment request to the broker after it consumes a message successfully. Then, this consumed message will be permanently stored, and deleted only after all the subscriptions have acknowledged it. If you want to store the messages that have been acknowledged by a consumer, you need to configure the [message retention policy](concepts-messaging.md#message-retention-and-expiry).

For batch messages, you can enable batch index acknowledgment to avoid dispatching acknowledged messages to the consumer. For details about batch index acknowledgment, see [batching](#batching).
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