April 2015
Intermediate to advanced
340 pages
7h 21m
English
Content preview from Mastering Python for FinanceBecome 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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A word count program in Hadoop
Perhaps the simplest way to get started with understanding programming for Hadoop is a simple word count functionality on a fairly large electronic book. The map program will read in every line of the text separated by a space or tab and return a key-value pair, which is by default assigned to a count of 1. The reduce program will read in all key-value pairs from the map program and sum up the number of similar words. Hadoop will produce an output file that contains a list of words in the book and the number of times the words have appeared.
Downloading sample data
Project Gutenberg hosts over 100,000 free e-books in HTML, EPUB, Kindle, and plain-text UTF-8 formats. For our testing with a sample e-book, let's use ...
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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.
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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.