The examples in this repository are support to the Spark in Action, 2nd edition book by Jean-Georges Perrin and published by Manning. Find out more about the book on Manning's website.

Welcome to Spark in Action, 2nd edition, chapter 4. This chapter is about laziness.

The dataset used in this chapter is NCHS' teen birth rates for age group 15 to 19 in the United States, divided by County, from 2003 to 2015.

This code is designed to work with Apache Spark v3.1.2.

Each chapter has one or more labs. Labs are examples used for teaching in the book. You are encouraged to take ownership of the code and modify it, experiment with it, hence the use of the term lab.

The TransformationAndActionApp application does the following:

1. It acquires a session (a SparkSession).
2. It asks Spark to load (ingest) a dataset in CSV format.
3. It demonstrates Spark's Transformation and action API.

The TransformationExplainApp builds on lab #200 and shows the use of the dataframe explain() method, which is the same as the EXPLAIN keyword in Spark SQL. All Spark v3 explain options are used in the code: simple, extended, codegen, cost, and formatted.

For information on running the Java lab, see chapter 4 in Spark in Action, 2nd edition.

Prerequisites:

You will need:

• git.
• Apache Spark (please refer Appendix K: Installing Spark in production and a few tips).

Step by step direction for lab #200. You will need to adapt some steps for the other labs.

1. Clone this project

   git clone https://github.com/jgperrin/net.jgp.books.spark.ch04

2. Go to the lab in the Python directory

   cd net.jgp.books.spark.ch04/src/main/python/lab200_transformation_and_action/

3. Execute the following spark-submit command to create a jar file to our this application

   spark-submit transformationActionApp.py

Prerequisites:

You will need:

• git.
• Apache Spark (please refer Appendix K: Installing Spark in production and a few tips).

Step by step direction for lab #200. You will need to adapt some steps for the other labs.

1. Clone this project

   git clone https://github.com/jgperrin/net.jgp.books.spark.ch04

2. Go to the lab directory

   cd net.jgp.books.spark.ch04

3. Package application using the sbt command

   sbt clean assembly

4. Run Spark/Scala application using spark-submit command as shown below:

   spark-submit --class net.jgp.books.spark.ch04.lab200_transformation_and_action.TransformationAndActionScalaApp target/scala-2.12/SparkInAction2-Chapter04-assembly-1.0.0.jar

1. [2020-06-07] Updated the pom.xml to support Apache Spark v3.1.2.
2. [2020-06-07] As we celebrate the first anniversary of Spark in Action, 2nd edition is the best-rated Apache Spark book on Amazon.

1. [Java] Due to renaming the packages to match more closely Java standards, this project is not in sync with the book's MEAP prior to v10 (published in April 2019).
2. [Scala, Python] As of MEAP v14, we have introduced Scala and Python examples (published in October 2019).
3. With Spark v3.0.0 preview 2, the number of iterations in lab #200 went from 60 to 10.
4. The master branch contains the last version of the code running against the latest supported version of Apache Spark. Look in specifics branches for specific versions.

Follow me on Twitter to get updates about the book and Apache Spark: @jgperrin. Join the book's community on Facebook or in Manning's Live Book site.