 big data challenges I mean there's kind of two sides of the house there's the OLTP stuff and there's the OLAP stuff and in the past I was traditionally working on all of the OLAP stuff so the Hadoop data warehouse the Hive data warehouse and there it's you know keeping up with capacity we make it really really easy at Facebook to put data into the warehouse so that means that there's constantly and constantly data going in there I think the most recent stat is something like 250 terabytes of data into the warehouse every day so just data growth is astronomical I mean it's really just keeping up with literally putting in more disk drives to keep up with it and then on the other side of the house the the transactional side which is where I'm working now the challenge is there is pretty much just scale I mean it's it's it's the same challenge I guess