How can I build my topics if I have multiple machines and users?

Hi!

I would like to know how can I build the next scenario.

I have a web application that is communicating with a multiple machines.
The user 1 is using machine A, and the user 2 is using machine B
How can I build my logic or topics so the messages that user 1 is sending to machine A only arrives to that machine, and the messages that user 2 is sending to machine B only arrives to that machine?

Answered here java - How to make a partition of a topic in Kafka by user_id? - Stack Overflow

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