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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222
11
章
Spark
アプリケーションのパッケージ化
11.2.2
SparkSession
の生成
Spark 2.0 からは、それまでのバージョンに比べて
SparkContext
の生成がややシンプルに
なりました。実際のところ、
SparkContext
を明示的に生成する代わりに、現在ではSparkは
SparkSession
を使って高レベルの機能を公開するようになっています。次がそのやり方です。
from pyspark.sql import SparkSession
spark = SparkSession \
.builder \
.appName('CalculatingGeoDistances') \
.getOrCreate()
print('Session created')
必要なことは、上のコードだけですべて済んでいます！
RDD API
を使いたければ、そうすることもできます。ただし
SparkContext
を生成する必
要はありません。
SparkSession
が舞台裏で
SparkContext
を作ってくれています。
RDD
API
にアクセスするには、（上の例でいえば）単に
sc = spark.SparkContext
とするだけ
で済みます。
この例では、まず
SparkSession
オブジェクトを生成し、その内部クラスの
.builder
を呼ん
でいます。
.appName(...)
でアプリケーションの名前が指定でき、
.getOrCreate()
メソッドは
SparkSession
がまだな ...
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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.