>From description such architecture looks simple, but from my experience 
it's far from simple to built such a system.

There are questions like 

- who will keep an eye on monitoring and restarting died agents.
- where to store data?
- what to do if data sent to died agent? Should it be recovered and 
restarted?
- how to restart and restore state of died agents?
- how much agents start on one machine? how to measure, distribute and 
balance load? How to add new machine or fix broken?
...

And all this becomes even more complex if there are requirements for 
transactions or atomicity of operations.

I'd suggest to not to built such system and instead fake it with simpler 
approaches. I.e. message queues, databases, stateless workers.

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