Can NATS keep messages in memory if no workers are online at the moment (producer-consumers pattern)?

Question

I would like to use NATS to distribute tasks among several worker-processes. Everything works as expected if I have at least one worker "online", but if there are no worker-processes, messages are just thrown away, when I turn on one worker I got no messages (which were created when it was not online).

I know how to do it with RabbitMQ, but is it possible to do it with NATS?

I do project in Python, producer-process in aiohttp, worker-processes are also in Python and do some CPU-heavy tasks.

Answer 1

By this day official Python connector does not support NATS/Jetsream issue-209

Answer 2

Are you familiar with JetStream? JetStream retains messages so they can be replayed. You can configure your stream to only discard the message once it's been acknowledged. Not sure what the state of python client is in regard to JetStream, I know it it being worked on. https://github.com/nats-io/nats.py