title: Jmeter reading input parameters from dynamically appending file
body: <p>Please tell me, is it possible to read data into Jmeter from a dynamically changing file? I have a file with parameters, which will be appended during the test itself. Is it possible to somehow define a global counter that will allow each thread to read its own line every iteration? User Defined Variables are reset every iteration as i understood.
  In theory, I can read a specific line using File.readLines().get(<em>counter</em>) in JSR223 Sampler but problem is how to define correctly this <em>counter</em>.</p>