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Exercise

Assigning integer id's to movies

Let's do the same thing to the movies. Then let's join the new user IDs and movie IDs into one dataframe.

Instructions

100 XP
  • Use the .select() and the .distinct() methods to extract all unique Movies from the ratings dataframe.
  • Repartition the movies dataframe to one partition using coalesce().
  • Complete the partial code provided to assign unique integer IDs to each movie. Name the new column movieId and call the .persist() method on the resulting dataframe.
  • Join the ratings dataframe to the users dataframe and subsequently to the movies dataframe. Call the result movie_ratings.