Message Delivery By David Boyne
Message Delivery By David Boyne
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Different systems will provide different messaging solutions, understanding these can help you understand how your messages will be given to downstream services.
At-most-once delivery
- Delivery means message will be delivered once
- If it fails it can be lost
At-least-once delivery
- Message may duplicate to consumer.
- Multiple attempts can be made to deliver message.
- Important to have idempotent consumers
- Multiple attempts can be made to deliver the message to the target until one succeeds. This means messages can be duplicated but not lost.
Exactly-once delivery
- Message is given to the target exactly once
- Message cannot be lost of duplicated
Extra resources
- At-least-once delivery - Short blog post to help.
- Exactly-once delivery - Short blog post to help.
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