getJSON caches file while it is being updated

Question

I have a loading process running which fills my database over the course of roughly 37 seconds on my local machine. I am at this point making a process for this, but the results are skewed.

As I am running my code I call getJSON in a loop to constantly pull data out of a JSON file. While I am making my request, I have my loading perform a constant update on set JSON file as described.

However, it seems my pull is constantly being cached as I get constantly the same results back. If I refresh the JSON file in my browser while doing in the loading procedure, then it suddenly it works correctly again.

I am assuming this is a caching problem, but adding the false caching to the AJAX variables probably isn't gonna cut it. It's a process that runs next to it. Does anyone know how to force it to pull an uncached file, so I always have the right results?

$.ajax({
  cache: false,
  url: vars.url,
  type: "post",
  data: r,
  async: true,
  processData: vars.process,
  contentType: vars.contenttype,
  beforeSend: function() {
    if (vars.loadbar == 'true') {
      interval = setInterval(function() {
        $.getJSON(domain + '/core/files/results.json', function(data) {
          console.log(data);
        })
      }, 500);
    }
  },
  complete: function() {
    clearInterval(interval);
  },
  success: function(data) {
    // ...
  }
});

Answer 1

I realized I let this question do the running here, but this is how i ended up solving this issue.

    beforeSend: function(){
        if(vars.loadbar == 'true'){
            interval = setInterval(function () {
                $.getJSON(domain + '/core/files/results.json?sid=' + Math.random() ,  function (data) {
                // extra code and console logs
                })
            }, 500);
        }
    },

In the end I adapted the comment from @AdamRoof to actually use in the secondairy call. Now it wont be cached so I have always the correct value back.