mongospark

> db.personal_ratings.find()
{ "_id" : ObjectId("57226a50a45eff77e4dc3fce"), "user_id" : "0", "movie_id" : "1", "rating" : "4" }
{ "_id" : ObjectId("57226a50a45eff77e4dc3fcf"), "user_id" : "0", "movie_id" : "2", "rating" : "4" }
{ "_id" : ObjectId("57226a50a45eff77e4dc3fd0"), "user_id" : "0", "movie_id" : "16", "rating" : "5" }
{ "_id" : ObjectId("57226a50a45eff77e4dc3fd1"), "user_id" : "0", "movie_id" : "19", "rating" : "3" }
{ "_id" : ObjectId("57226a50a45eff77e4dc3fd2"), "user_id" : "0", "movie_id" : "47", "rating" : "4" }
{ "_id" : ObjectId("57226a50a45eff77e4dc3fd3"), "user_id" : "0", "movie_id" : "70", "rating" : "4" }
{ "_id" : ObjectId("57226a50a45eff77e4dc3fd4"), "user_id" : "0", "movie_id" : "163", "rating" : "5" }
{ "_id" : ObjectId("57226a50a45eff77e4dc3fd5"), "user_id" : "0", "movie_id" : "173", "rating" : "1" }
{ "_id" : ObjectId("57226a50a45eff77e4dc3fd6"), "user_id" : "0", "movie_id" : "356", "rating" : "5" }
{ "_id" : ObjectId("57226a50a45eff77e4dc3fd7"), "user_id" : "0", "movie_id" : "364", "rating" : "5" }
>