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
7
コ スト
オプティマ イ ザー
論理的な最適化
コ ード 生 成
分析
最適化
された
論理計画
物理
計画
物理
計画
物理
計画
物理
計画
物理
計画
論理計画
未解決の
論理計画
論理計画
物理計画
さらに詳しい情報については、Deep Dive into Spark SQL's Catalyst Optimizer（
http://bit.
ly/271I7Dk
）や Apache Spark DataFrames: Simple and Fast Analysis of Structured Data
（
http://bit.ly/29QbcOV
）を参照してください。
1.2.6
Project Tungsten
Tungstenは、Apache Spark の実行エンジンの包括的なプロジェクトのコードネームです。このプロ
ジェクトが焦点としているのは、Spark のアルゴリズムを改善し、メモリや CPU の 利 用効 率を高 め、現
代的なハードウェアのパフォーマンスを限界近くまで使い切ることです。
このプロジェクトが特に重要視していることは、次のとおりです。
●
メモリを直接管理することによって、JVMのオブジェクトモデルとガベージコレクションのオー
バーヘッドをなくすこと。
●
メモリ階層を活用するアルゴリズムとデータ構造の設計。
●
実行時にコードを生成することによって、アプリケーションが現代的なコンパイラや CPUのため
の最適化を活用できるようにすること。
●
仮想関数のディスパッチをな ...
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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.