edx/configuration — pull request #299 by carsongee (2013-10-01 19:53:14+00:00)
Title: Added ability for mongo role to do simple replica set clusters

By default this should keep the role the same. The only catch with this implementation
is that the ansible mongodb_user module doesn't handle slaves particularly well. So if you
have a cluster than any task that creates a user will succeed on the master and fail on all
slaves. As a result the play has been changed to ignore failure at user creation.