mongoid/mongoid — pull request #1739 by shyouhei (2012-02-21 14:13:41+00:00)
Title: Mongo::OperationTimeout shall be handled by Mongoid::Collections::Retry

I have just encountered this exception when my MongoDB master node got an ill cable. The MongoDB cluster properly failed over to a secondary node, while my script, which was about to read from the problematic master node, died without retrying.