Added place holder for read from memory optimisation rather than disk
Added place holder for read from memory optimisation rather than disk

RobertTheGrey/spark,SparkViewEngine/spark,SparkViewEngine/spark,RobertTheGrey/spark,SparkViewEngine/spark,SparkViewEngine/spark,RobertTheGrey/spark,SparkViewEngine/spark,RobertTheGrey/spark,SparkViewEngine/spark,SparkViewEngine/spark,RobertTheGrey/spark,RobertTheGrey/spark,RobertTheGrey/spark