def _main(self, transfer_future, **kwargs):
        """
        :type transfer_future: s3transfer.futures.TransferFuture
        :param transfer_future: The transfer future associated with the
            transfer request that tasks are being submitted for

        :param kwargs: Any additional kwargs that you may want to pass
            to the _submit() method
        """
        try:
            self._transfer_coordinator.set_status_to_queued()

            # Before submitting any tasks, run all of the on_queued callbacks
            on_queued_callbacks = get_callbacks(transfer_future, 'queued')
            for on_queued_callback in on_queued_callbacks:
                on_queued_callback()

            # Once callbacks have been ran set the status to running.
            self._transfer_coordinator.set_status_to_running()

            # Call the submit method to start submitting tasks to execute the
            # transfer.
            self._submit(transfer_future=transfer_future, **kwargs)
        except BaseException as e:
            # If there was an exception raised during the submission of task
            # there is a chance that the final task that signals if a transfer
            # is done and too run the cleanup may never have been submitted in
            # the first place so we need to account accordingly.
            #
            # Note that BaseException is caught, instead of Exception, because
            # for some implmentations of executors, specifically the serial
            # implementation, the SubmissionTask is directly exposed to
            # KeyboardInterupts and so needs to cleanup and signal done
            # for those as well.

            # Set the exception, that caused the process to fail.
            self._log_and_set_exception(e)

            # Wait for all possibly associated futures that may have spawned
            # from this submission task have finished before we anounce the
            # transfer done.
            self._wait_for_all_submitted_futures_to_complete()

            # Announce the transfer as done, which will run any cleanups
            # and done callbacks as well.
            self._transfer_coordinator.announce_done()
:type transfer_future: s3transfer.futures.TransferFuture
        :param transfer_future: The transfer future associated with the
            transfer request that tasks are being submitted for

        :param kwargs: Any additional kwargs that you may want to pass
            to the _submit() method