code: function(callback){
  
          var client = this._get_system_client();
          var keyspace_name = this._connection.keyspace,
              replication_text = '',
              options = this._options;
  
          replication_text = this._generate_replication_text(options.replication_strategy);
  
          var query = util.format(
              "CREATE KEYSPACE IF NOT EXISTS %s WITH REPLICATION = %s;",
              keyspace_name,
              replication_text
          );
          client.execute(query, function(err,result){
              client.shutdown(function(){
                  callback(err,result);
              });
          });
      }
docs: Ensure specified keyspace exists, try to create it otherwise
  @param  {Apollo~GenericCallback} callback Called on keyspace assertion
  @private