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  3. Introduction to Spark SQL in Python

Exercise

Practicing caching: the SQL

Previously, we examined two DataFrames: df1 and df2 (which is created from df1). We tried caching df1, but not df2. In this exercise, we'll examine the effects of caching df2, but not df1.

Once again, note the amount of time that each action takes. We'll be comparing these in the next exercise. Which tasks are sped up? Which are slowed down?

Instructions

100 XP
  • Cache df2, but not df1.
  • Run a first action on df1 and repeat it, then run an action df2 and repeat it. This has been done for you.