I want to load test RUN operation with 500 users. So I set threads as 500 in thread group. I have a header parameter "username" for the RUN request.
Now, I want to have different username for each request. How do I do it? Do I need a CSV Data Set Config? But then while controller would be needed. And it will go through entire csv for each thread (user), which I don't want.
So how do I do it?