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I spent some time search around for this and eventually had to go though the source to find out.
The question was; is the DB object from Mongo.getDb() tied to a single Mongo instance or will calls to it be made to all nodes in the cluster? Secondary, is the object thread safe?
So it is thread safe, that one was easy. After going though the source, (version 2.9.1), I found that the entire list of ServerAddresses is passed in as part of the creation of the DB object.