August 2015
Intermediate to advanced
312 pages
7h 28m
Japanese
Content preview from 初めてのSpark
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255
A.5 バージョン 1.3.1 の主な変更点
A.4.5
Spark Streaming
• SPARK-4964:
［機能改善］ダイレクト
Kafka API
の追加
• SPARK-5047:
［機能改善］
Python
の
Kafka
対応
• SPARK-4979:
［機能改善］ロジスティック回帰のストリーム処理対応
• SPARK-3660:
［機能改善］ステートフルオペレーションでの初期
RDD
指定機能の追加
ダイレクト
Kafka API
について
Spark Streaming
でデータソースとして
Kafka
を利用する方法に、
Receiver
を使用せずに
Kafka
のシンプル
Consumer API
を利用する方式が追加されました。ただし現在は
Experimental
の段階であり、
Python
版が未実装である点にご注意ください。
Receiver
を使用しない方式のメ
リットは以下の点です。
• Kafka
のパーティションに合わせて並列でデータを取得できます。
Receiver
使用方式で
は、並列度を高めるために複数のストリームを定義し、それらを結合させる必要がありま
したが、シンプル
Consumer API
を利用する方式ではその工夫が不要です。
•
メッセージ処理の障害耐性を高めるための
Write Ahead Log
（
WAL
）が不要になるので、
Kafka
と
Spark Streaming
の両方でデータ冗長性を担保していた無駄が解消されます。
• Receiver
使用方式では
Kafka
のハイレベル
API
を利用し ...
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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.