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  3. Big Data Fundamentals with PySpark
  • 1

    Introduction to Big Data analysis with Spark

    Free

    This chapter introduces the exciting world of Big Data, as well as the various concepts and different frameworks for processing Big Data. You will understand why Apache Spark is considered the best framework for BigData.

  • 2

    Programming in PySpark RDD’s

    The main abstraction Spark provides is a resilient distributed dataset (RDD), which is the fundamental and backbone data type of this engine. This chapter introduces RDDs and shows how RDDs can be created and executed using RDD Transformations and Actions.

  • 3

    PySpark SQL & DataFrames

    In this chapter, you'll learn about Spark SQL which is a Spark module for structured data processing. It provides a programming abstraction called DataFrames and can also act as a distributed SQL query engine. This chapter shows how Spark SQL allows you to use DataFrames in Python.

  • 4

    Machine Learning with PySpark MLlib

    PySpark MLlib is the Apache Spark scalable machine learning library in Python consisting of common learning algorithms and utilities. Throughout this last chapter, you'll learn important Machine Learning algorithms. You will build a movie recommendation engine and a spam filter, and use k-means clustering.

Initializing

Exercise

ReduceBykey and Collect

One of the most popular pair RDD transformations is reduceByKey() which operates on key, value (k,v) pairs and merges the values for each key. In this exercise, you'll first create a pair RDD from a list of tuples, then combine the values with the same key and finally print out the result.

Remember, you already have a SparkContext sc available in your workspace.

Instructions

100 XP
  • Create a pair RDD named Rdd with tuples (1,2),(3,4),(3,6),(4,5).
  • Transform the Rdd with reduceByKey() into a pair RDD Rdd_Reduced by adding the values with the same key.
  • Collect the contents of pair RDD Rdd_Reduced and iterate to print the output.