August 2015
Intermediate to advanced
312 pages
7h 28m
Japanese
Content preview from 初めてのSpark
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.
218
10 章 Spark Streaming
このストリーミングの
UI
は、バッチの処理とレシーバの統計を表示してくれます。この例では
1
つのネットワークレシーバがあり、メッセージの処理のレートを見て取ることができます。処理
が追いついていない場合に、各レシーバが処理できるレコード数を見ることもできるでしょう。ま
た、レシーバに障害が起きているかもわかります。バッチ処理の統計は、バッチの処理にかかる時
間や、ジョブのスケジューリングに遅れが生じているかどうかも示します。クラスがに競合が起き
ているなら、スケジュールの遅延は大きくなっていくかもしれません。
10.8
フーンの
これまで
Spark
全般について議論してきたパフォーマンスに関する考慮点に加えて、
Spark
Streaming
アプリケーションには、特有のチューニングのポイントがあります。
10.8.1
バッンドのイ
最もよくある疑問は、
Spark Streaming
で使える最小のバッチサイズです。概して、多くのア
プリケーションの最小値としては、
500
ミリ秒が良い値だといわれています。最も優れたアプロー
チは、もっと大きなバッチサイズ（
10
秒程度）から始め、少しずつバッチサイズを小さくしてい
くことです。ストリーミングの
UI
で報告される処理時間が一定のままならバッチサイズを下げて
いってもかまいませんが、処理時間が増大しているようなら、そのアプリケーションでの限度に達
したと推測できます。
ウィンドウ処理の場合も同様に、結果を計算するインターバル（すなわちスライド期間）は、パ ...
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.