Seems like the solution is to employ MapReduce http://had00b.blogspot.com/2013/07/random-subset-in-mapreduce.html http://had00b.blogspot.com/2013/07/random-subs

Seems like the solution is to employ MapReduce http://had00b.blogspot.com/2013/07/random-subset-in-mapreduce.html http://had00b.blogspot.com/2013/07/random-subset-in-mapreduc...