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Discussion on: Use cases for persistent logs with NATS Streaming

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Byron Ruth Author

Thank you! There are a few different concerns you are describing. One is defining the start message for a given subscription, such as the beginning for a new subscription or some other arbitrary position. The second is implicit vs. manual ack-ing of messages as the consumer processes them. If the manual ack mode is enabled, then the consumer is required to call Ack() in order to tell the server (NATS Streaming) that the message should not be redelivered. Not doing manual acks means the server will implicitly assume once it delivers the message to the consumer it has been handled and/or the consumer doesn't want to receive it again even if there was a problem processing it locally.

Hopefully that helps a bit?