August 2015
Intermediate to advanced
312 pages
7h 28m
Japanese
Content preview from 初めてのSpark
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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.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.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.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.
122
7 章 クラスタでの動作
て動作します。ドライバとそのエクゼキュータ群は、まとめて
Spark
ーと呼ばれ
ます。
7-1
Spark
ー
Spark
のアプリケーションは、ーと呼ばれる外部のサービスを使い、複数のマ
シン上で起動されます。すでに触れた通り、
Spark
のパッケージには
Standalone
クラスタマネー
ジャと呼ばれるクラスタマネージャが組み込まれています。また、
Spark
は
Hadoop YARN
およ
び
Apache Mesos
という、広く利用されている
2
つのオープンソースクラスタマネージャとも動
作できます。
7.2.1
ドライバ
ドライバは、作成するプログラムの
main()
メソッドを実行するプロセスです。このプロセスが
実行するユーザーコードが、
SparkContext
の生成や
RDD
の生成を行い、変換やアクションを実
行することになります。
Spark
シェルを起動した場合、それはドライバプログラムを生成したので
す（
Spark
シェルでは、
sc
という名前で
SparkContext
がロード済みになっていることを覚えてま
すか？）。ドライバが終了すれば、アプリケーションも動作を終えたことになります。
ドライバは、実行に際して
2
つの処理に責任を負います。
ーーム
Spark
のドライバは、ユーザーのプログラムを物理的な実行の単位に変換しなければなりま
せん。この実行の単位はと呼ばれます。高いレベルで見れば、すべての ...
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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.