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Hadoop in Practice, Second Edition by Alex Holmes

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Chapter 2. Introduction to YARN

This chapter covers

  • Understanding how YARN works
  • How MapReduce works as a YARN application
  • A look at other YARN applications

Imagine buying your first car, which upon delivery has a steering wheel that doesn’t function and brakes that don’t work. Oh, and it only drives in first gear. No speeding on winding back roads for you! That empty, sad feeling is familiar to those of us who want to run some cool new tech such as graph or real-time data processing with Hadoop 1,[1] only to be reminded that our powerful Hadoop clusters were good for one thing, and one thing only: MapReduce.

1 While you can do graph processing in Hadoop 1, it’s not a native fit, which means you’re either incurring the inefficiencies of multiple ...

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