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Hi Dirk,<div><br></div><div>The slightly better solution would be that the handler invoked over RabbitMQ for the ProductDiscontinued event would look up the IDs of all the related Orders that need to be cancelled and then send out a CancelOrder command for each one of them also over RabbitMQ. Then, the handler for the CancelOrder command would be modifying just the one aggregate in each transaction.</div><div><br></div><div>As Greg mentioned in his response, you need to be aware that RabbitMQ doesn't enlist in transactions with any other persistence technology. If you're careful and test well, this can be handled with idempotence. Alternatively, you could use what's known as the Outbox pattern, like we've implemented in NServiceBus: <a rel="nofollow" target="_blank" href="h
ttps://docs.particular.net/nservicebus/outbox/">https://docs.particular.net/nservicebus/outbox/</a>. </div><div><br></div><div>Cheers,</div><div><br></div><div>Udi Dahan</div>
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