edx/edx-platform — pull request #3879 by symbolist (2014-05-26 13:58:18+00:00)
Title: Do not persist anonymous ids when exporting for all students of a course.

For large courses this causes export to take a long time and to time out. Creating md5s does not take a long time though. In my devstack it takes around 6 seconds to generate a million ids.

LMS-2747