private void pause() throws InterruptedException {
            if (pauseTime > 0) {
                Thread.sleep(pauseTime);
                pauseTime = Math.min((long)(pauseTime*1.5), TimeUnit.MINUTES.toMillis(1));
            } else {
                pauseTime = 500;
            }
        }
Retrieves the path to a file or directory on the local file system
that has been transferred with the vespa file distribution
mechanism.

Intended to be the only real implementation of FileAcquirer.

@author Tony Vaagenes
fileacquirer/src/main/java/com/yahoo/filedistribution/fileacquirer/FileAcquirerImpl.java