You'll probably only call this function if progress polling times out and its
error message tells you to call pollProgress
to resume.
pollProgress(progress_url, wait = 0.5, error_handler = NULL)
The percent completed of the progress. Assuming the
options(crunch.timeout)
(default: 15 minutes) hasn't been reached, this
will be 100. If the timeout is reached, it will be the last reported progress
value.
A Crunch progress URL
Number of seconds to wait between polling. This time is increased 20 percent on each poll.
An optional function that takes the status object when the progress is less than 0 (meaning the request failed)