August 2015
Intermediate to advanced
312 pages
7h 28m
Japanese
Content preview from 初めてのSpark
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151
8.2 実行の構成要素：ジョブ、タスク、ステージ
オ
spark.serializer org.apache.
spark.
serializer.
JavaSerializer
ネットワーク越しに送信されたり、シリアライズされ
た後にキャッシュされる必要があるオブジェクトのシ
リアライズ処理に使われるクラス。デフォルトの
Java
Serialization
はシリアライズ可能な任意の
Java
のク
ラスに対して使えるものの、非常に低速なため、
org.
apache.spark.serializer.KryoSerializer
の使用が望
ましい。速度が求められる場合には、
Kryo
によるシ
リアライゼーションを設定する。
org.apache.spark.
serializer
の任意のサブクラスが使用できる。
spark.[X].port
（ランダム）
Spark
のアプリケーションの実行に使用されるポート
番号を整数で設定する。これは、ネットワークアク
セスがセキュアになっているクラスタで役立つ。
X
の
部分に使える値は、
driver
、
fileserver
、
broadcast
、
replClassServer
、
blockManager
、
executor
、
ui
のいず
れか。
spark.eventLog.enabled false
この値を
true
に設定するとイベントのロギングが有効
になり、完了した
Spark
のジョブをヒストリサーバー
を使って見ることができるようになる。
Spark
のヒス
トリサーバーの詳しい情報については、公式ドキュメ ...
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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.