Add Outbox docs #3763
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Add Outbox docs #3763
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Signed-off-by: yaron2 <[email protected]>
msfussell
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Sep 26, 2023
daprdocs/content/en/developing-applications/building-blocks/state-management/howto-outbox.md
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| The transactional outbox pattern is a well known powerful design pattern for sending notifications about a change in a system's state using a single transaction that spans across the database and message broker used to deliver the notification. Developers are faced with many difficult technical challanges when trying to implement this pattern on their own, which often involves writing error-prone central coordination managers that end up supporting a combination of one or two databases and message brokers at most. | ||
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| With Dapr's outbox support, developers can notify subscribers when a system's state is created or updated when calling Dapr's [transactions API]({{< ref "state_api.md#state-transactions" >}}). |
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| With Dapr's outbox support, developers can notify subscribers when a system's state is created or updated when calling Dapr's [transactions API]({{< ref "state_api.md#state-transactions" >}}). | |
| With Dapr's outbox support, you can notify subscribers when an application's state is created, updated or deleted when calling Dapr's [transactions API]({{< ref "state_api.md#state-transactions" >}}). |
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Add the text below....
The diagram below is an overview of how the outbox pattern works:
1) Service A saves/updates state to the state store using a transaction.
2) A message is written to the broker under the same transaction. When the message is successfully delivered to the message broker the transaction completes ensuring the state and message are transacted together.
3) The message broker delivers the message topic to any subscribers, in this case Service B.
<img src="/images/state-management-outbox.png" width=800 alt="Diagram showing the steps of the outbox pattern">
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I will send you a PNG file to include into this PR and check into the static/images folder
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The suggested change is incorrect, outbox is about notifying when data has been created or inserted, not deleted.
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| ### Combining outbox and non-outbox messages on the same state store | ||
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| If you want to use the same state store for sending both outbox and non-outbox messages, simply define two state store components, where one has the outbox feature and the other does not. |
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| If you want to use the same state store for sending both outbox and non-outbox messages, simply define two state store components, where one has the outbox feature and the other does not. | |
| If you want to use the same state store for sending both outbox and non-outbox messages, simply define two state store components that connect to the same state store, where one has the outbox feature and the other does not. |
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Two questions
- Is it better to use MySQL as an example here than Redis, given that Redis is not a "True" transactional state store
- If I do use Redis, could I use the same Redis instance for both the state store and the message broker? Is so, then I would mention this.
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Yes, I switched to MySQL as its a better example.
daprdocs/content/en/developing-applications/building-blocks/state-management/howto-outbox.md
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…ate-management/howto-outbox.md Co-authored-by: Mark Fussell <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
…ate-management/howto-outbox.md Co-authored-by: Mark Fussell <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
…ate-management/howto-outbox.md Co-authored-by: Mark Fussell <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
Signed-off-by: yaron2 <[email protected]>
Signed-off-by: yaron2 <[email protected]>
…ate-management/howto-outbox.md Co-authored-by: Mark Fussell <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
…ate-management/howto-outbox.md Co-authored-by: Mark Fussell <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
…ate-management/howto-outbox.md Co-authored-by: Mark Fussell <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
…ate-management/howto-outbox.md Co-authored-by: Mark Fussell <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
…ate-management/howto-outbox.md Co-authored-by: Mark Fussell <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
Signed-off-by: yaron2 <[email protected]>
Signed-off-by: yaron2 <[email protected]>
Signed-off-by: yaron2 <[email protected]>
Signed-off-by: yaron2 <[email protected]>
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@msfussell all feedback has been addressed |
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@hhunter-ms - LGTM. Any feedback on this? |
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Stale PR, paging all reviewers |
hhunter-ms
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Oct 3, 2023
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…ate-management/howto-outbox.md Co-authored-by: Hannah Hunter <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
…ate-management/howto-outbox.md Co-authored-by: Hannah Hunter <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
…ate-management/howto-outbox.md Co-authored-by: Hannah Hunter <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
…ate-management/howto-outbox.md Co-authored-by: Hannah Hunter <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
…ate-management/howto-outbox.md Co-authored-by: Hannah Hunter <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
…ate-management/howto-outbox.md Co-authored-by: Hannah Hunter <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
…ate-management/howto-outbox.md Co-authored-by: Hannah Hunter <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
…ate-management/howto-outbox.md Co-authored-by: Hannah Hunter <[email protected]> Signed-off-by: Yaron Schneider <[email protected]>
@hhunter-ms changes made. |
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Add documentation for the outbox feature.
Closes #3733.