Professional Hadoop Solutions

Chapter 9

Real-Time Hadoop

WHAT’S IN THIS CHAPTER?

• Getting to know different types of real-time Hadoop applications
• Dissecting examples of HBase-based real-time applications
• Understanding new approaches for building Hadoop real-time applications

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 9 download and individually named according to the names throughout the chapter.

So far in this the book, you have learned about how to use Hadoop for batch processing, which is very useful, but limited with regard to the number and types of problems that companies are trying to solve. Real-time access to Hadoop’s massive data storage and processing power will lead to an even more expanded use of this ecosystem.

NOTE The term “real time” derives from its use in early simulation techniques, which simulated real-world processes at a rate that matched the rate of the real process. Typically, a system is considered to be real-time if the correctness of its functionality is defined by both its logical correctness, and the amount of time in which its operations are performed.

“Real time” is one of those terms that means different things to different people and has different applications. It largely depends on the timing requirement imposed by the system’s consumers. In the context of this chapter, “real-time Hadoop” describes any Hadoop-based implementation ...