August 2015
Intermediate to advanced
312 pages
7h 28m
Japanese
Content preview from 初めてのSpark
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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.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.
160
8 章 Spark のチューニングとデバッグ
グが有効化されているかをデバッグしている場合、とりわけ複数の設定の仕組みを使用している場
合には、このページが役に立ちます。このページには、アプリケーションに追加した
JAR
やファ
イルのリストもあります。これらは、依存対象の欠如といった問題を追跡するのに役立ちます。
8.3.2
ドライバクータのグ
ドライバプログラムやエクゼキュータが直接生成したログを調べることで、
Spark
からより多く
の情報が得られる場合があります。ログには、内部的な警告や、ユーザーのコードで生じた例外の
詳細など、生じた異常の詳しい証跡が含まれます。このデータは、エラーや予想外の動作のトラブ
ルシューティングに役立つかもしれません。
Spark
のログがどこに置かれるかは、デプロイのモードによります。
• Spark
の
Standalone
モードでは、アプリケーションのログは直接スタンドアローンマス
ターの
Web UI
に表示されます。このログは、デフォルトでは各ワーカーの
Spark
が置
かれているディレクトリの
work/
ディレクトリに保存されます。
• Mesos
では、ログは
Mesos
のスレーブの
work/
ディレクトリに置かれ、
Mesos
マスター
の
UI
からアクセスできます。
• YARN
モードでは、ログを最も簡単に収集する方法は、
YARN
のログ収集ツールを使っ
て、アプリケーションのログを含むレポートを生成することです（
yarn logs
-applicationId ...
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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.