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
Become 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,
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.
212
10
章
Structured Streaming
10.6
Structured Streaming
Spark 2.0では、Apache Spark のコミュニティは Structured Streamingという概念を導入することに
よって、ストリーミングをシンプルなものにしようとしてきました。Structured Streaming は 、ス ト リ ー
ミングの概念と Dataset/DataFrameとの橋渡しをするものです（次の図参照）。
インクリメンタル な
実行計画
プランナー論理計画
物理
計画
DataFrameの章で述べたとおり、SQLやDataFrameのクエリを Spark SQLのエンジン（そして
Catalyst Optimizer）で実行する際には1 つの論理計画の構築、多数の物理計画の構築、エンジン
によるコストオプティマイザに基づく適切な物理計画の選択、そしてコードの生成（すなわちcode
gen）が行われ、高いパフォーマンスを提供します。Structured Streamingでは、インクリメンタル
実行計画という概念が導入されます。データのブロックを処理する際に、Structured Streamingは
繰り返し実行計画を受信した新しいブロック群に適用していきます。こういった方法を採ることで、
Structured Streaming のエンジンは Spark のDataFrame/Dataset が持つ最適化の利点を活用し、入
力データフレームに対し ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.