lvlpurple/mubsub — pull request #3 by 117nord (2014-01-14 20:32:22+00:00)
Title: Handle createCollection 'already exists' error.

The mongodb module should handle it internally but it
doesn't do a good job of it. When multiple process create the
collection at the same time, the error can happen.
When it happens, we silently retry the create operation.