case class Feature(name:String, value:Double, time:String, period:String)
RESRDD = RDD.map(tuple=>{var bson=new BasicBSONObject(); bson.put("name",name); bson.put("value",value); (null,bson); })
RESRDD.map(_._2).map(f=>Feature(f.get("name").toString,f.get("value").toString.toDouble).toDF()