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.
189
10
Spark Streaming
データがやってきたらすぐに動作することがメリットになるアプリケーションはたくさんありま
す。例えば、リアルタイムでページビューの統計を追跡し、機械学習のモデルのトレーニングを
行い、異常を自動的に検出するようなアプリケーションがあるかもしれません。
Spark Streaming
は、そういったアプリケーションのための
Spark
のモジュールです。
Spark Streaming
を使えば、
ユーザーはストリーミングアプリケーションを書くのに、バッチのジョブとよく似た
API
を使う
ことができるので、バッチのジョブを構築するためのスキルの多くや、さらにはコードそのものさ
えも再利用できます。
Spark
が
RDD
という概念の上に構築されているように、
Spark Streaming
は
DStream
、あるい
は離散化ストリーム（
discretized stream
）と呼ばれる抽象概念を提供しています。
DStream
は、
時間と共にやってくるデータの並びです。内部的には、それぞれの
DStream
は時間のステップご
と（離散化という名前になっているのはそのためです）にやってくる
RDD
の並びとして表現され
ます。
DStream
は、
Flume
、
Kafka
、あるいは
HDFS
といった、多くのデータソースから生成で
きます。構築された後は、
DStream
では
2
種類の操作ができます。
transformation
は、
新しい
DStream
を出力する操作であり、は、データを外部のシステムに書き出す操作で ...
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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.