𝗘𝗳𝗳𝗶𝗰𝗶𝗲𝗻𝘁 𝗗𝗮𝘁𝗮 𝗣𝗶𝗽𝗲𝗹𝗶𝗻𝗲𝘀 𝘄𝗶𝘁𝗵 𝘁𝗵𝗲 𝗢𝘂𝘁𝗯𝗼𝘅 𝗣𝗮𝘁𝘁𝗲𝗿𝗻

𝗘𝗳𝗳𝗶𝗰𝗶𝗲𝗻𝘁 𝗗𝗮𝘁𝗮 𝗣𝗶𝗽𝗲𝗹𝗶𝗻𝗲𝘀 𝘄𝗶𝘁𝗵 𝘁𝗵𝗲 𝗢𝘂𝘁𝗯𝗼𝘅 𝗣𝗮𝘁𝘁𝗲𝗿𝗻

You need data to move between services in real time. You also need this data to be correct.

Sending messages to a broker during a database transaction is risky. If the broker fails, your data gets out of sync.

The outbox pattern fixes this.

Here is how it works:

• Save your data and the event in one transaction.
• Put the event in a local outbox table.
• A background worker reads this table.
• The worker sends the event to your message broker.
• The worker marks the event as sent.

You also need idempotent consumers. These consumers ignore duplicate messages. This prevents errors when the same event arrives twice.

This setup gives you a reliable system:

• Database and messages stay in sync.
• Services stay separate.
• You have a clear audit trail of events.

Use this for high reliability in distributed systems.

Source: https://dev.to/therizwansaleem/efficient-real-time-data-pipelines-with-event-sourced-microservices-and-the-outbox-pattern-37b1