November 2017
Intermediate to advanced
328 pages
6h 51m
Japanese
Content preview from 入門 PySpark ―PythonとJupyterで活用するSpark 2エコシステム
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1.2
Spark
のジョブと
API
3
詳細については
Apache Spark is the Smartphone of Big Data
（
http://bit.ly/1QsgaNj
）を参
照してください。
1.2
Spark
のジョブと
API
このセクションでは、Apache Spark のジョブと APIの概要を紹介します。これは、Spark 2.0 のアー
キテクチャに関するこれ以降の章に必要となる基盤です。
1.2 .1
実行のプロセス
あらゆる Sparkのアプリケーションは、マスターノード上の 1 つのドライバプロセス（これは複数の
ジョブを持つことができます）から立ち上げられ、数多くのワーカーノード上に分散配置されたエクゼ
キュータプロセス（これは複数のタスクを持ちます）に指示を送ります。次の図はその様子です。
タスクタスク
タスクタスク
タスクタスク
ワーカー
ジョブジョブ
ドライバ
ドライバプロセスは、ジョブに対して生成されたグラフに基づき、エクゼキュータノードに指示され
るタスクプロセスの数と構成を決定します。ワーカーノードは、さまざまな大量のジョブのタスクを実
行するかもしれないことに注意してください
Spark のジョブには、有行非循環グラフ（Direct Acyclic Graph = DAG）として構成されたオブジェ
クトの依存関係の連鎖が関連づけられます。次の図はその様子で、これはSpark UIが生成した図で
す。このグラフを踏まえて、Sparkはそれらのタスクのスケジューリング
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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.