mongodb manually unshard

mongodb-unshard.js

// set
var collection = ;
var db = ;
var fromHost = ;

// unshard
db = db.getMongo().getDB(db);
var collection = db.getCollection(collection);

var m = new Mongo(fromHost);
var remoteCollection = m.getDB(db).getCollection(collection);

var i = 0;
collection.find().forEach(function(row) {
	remoteCollection.insert(row);
	collection.remove({_id: row._id});

	if ((++i % 50000) == 0) {
		print("Updated: " + i);
	}
});
print("Updated: " + i);

Using this method, mongodb will not balance while you're inserting in another collection?