Is batchCSVUtilServlet thread safe?

Summary:

In order to complete csv uploads in a reasonable amount of time, I have written a script that posts multiple files (each from a different client process) to the batchCSVUtilServlet. The response shows success (all rows processed and no errors), but when I do a sanity check, I find that not all rows were inserted.

I am aware that oracle does not recommend the use of the batchCSVUtilServlet, but to my knowledge it is the only utility that at least theoretically supports automated uploads.

My question is, is this servlet thread safe, and if not, is there any way to make it thread safe? Since the largest file that is consistently processes is about 1 MB, processing the tens of Gigabytes will take a very long time to complete.