September 2013
Intermediate to advanced
504 pages
14h 22m
English
Content preview from Professional Hadoop SolutionsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 4
Customizing MapReduce Execution
WHAT’S IN THIS CHAPTER?
- Customizing Hadoop execution to better adhere to requirements of your application
- Seamlessly including your non-Java code in the MapReduce executable
WROX.COM CODE DOWNLOADS FOR THIS CHAPTER
The wrox.com code downloads for this chapter are found at www.wiley.com/go/prohadoopsolutions on the Download Code tab. The code is in the Chapter 4 download and individually named according to the names throughout the chapter.
In Chapter 3, you learned what MapReduce is, its main components, and their roles in MapReduce execution. Each one of these components is implemented as a Java class adhering to a specific interface, defined by a MapReduce framework. Hadoop provides many different implementations of each component, but sometimes you need a specific component to do things slightly differently. One of the most powerful Hadoop features is its extensibility, so you can always roll out your own implementation.
In this chapter, you learn how you can leverage this extensibility for customizing MapReduce execution to better suit the requirements of particular applications. The examples presented in this chapter go through every major MapReduce component, and show how to create its custom implementation to do exactly what you need. Some of the examples can be directly leveraged in your applications; some can just serve as an illustration of how the “magic” happens, and how to approach your own customization.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.