August 2015
Intermediate to advanced
312 pages
7h 28m
Japanese
Content preview from 初めてのSpark
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34
3 章 RDD を使ったプログラミング
Java 8
では、ラムダ式を使ってコンパクトに関数インターフェイスを実装できます。本書の執筆
時点では、
Java 8
はまだ比較的新しいので、本書のサンプルでは、それ以前のバージョンの
Java
のやや冗長な構文を使ってクラスを定義しています。ラムダ式を使った場合、検索のサンプルは
3-25
のようになります。
3-25
Java 8
ム
JavaRDD<String> errors = lines.filter(s -> s.contains("error"));
Java 8
のラムダ式の使い方に興味があるなら、
Oracle
のドキュメンテーション（
http://docs.
oracle.com/javase/tutorial/java/javaOO/lambdaexpressions.html
） か、
Spark
でのラムダ式の
使い方についての
Databricks
の
blog
ポスト（
http://databricks.com/blog/2014/04/14/spark-
with-java-8.html
）を参照してください。
無名のインナークラスとラムダ式は、どちらも自分が属するメソッド中の
final
な変数を参照でき
るので、Python や Scala の場合と同様に、これらの変数を Spark に渡すことができます。
3.5
なアクン
本章では、
Spark
で最も広く使われる変換やアクションを紹介していきます。それら以外にも、 ...
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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.