Hi,
This is a kind of question that is best answered by trying in a test env. I doubt anyone else had to do exactly the same thing and
there are factors such as RabbitMQ version and hardware used that may heavily impact the result.
So I'd recommend just importing that file and then testing the request. As an additional benefit, you will practice before doing that in production.
Something like:
```
rabbitmqctl import_definitions users-100k.json
jq '{users: [.users[].name]}' < users-100k.json > usernames.json
```
There will be some impact for sure - after all, it's work that RabbitMQ needs to perform, but it's probably not much of a deal.
Splitting this into a few calls is probably a good idea to be on the safe side.
Best,