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.
138
7 章 クラスタでの動作
せるようにするためです。これは通常、こうしたシステムではデータをすべてのノードにまたがっ
て分散させているためです。もしそうしたければ、
conf/spark-defaults.conf
の
spark.deploy.
spreadOut
を
false
に設定すれば、
Spark
に対してエクゼキュータをできる限り集約させることも
できます。この場合、先ほどのアプリケーションが取得するエクゼキュータは
2
つだけになり、
それぞれに
1GB
の
RAM
と
4
つのコアが割り当てられます。この設定は、
Standalone
ーものであり、
Standalone
クラスタマネージャを起動す
る前に設定しておかなければなりません。
高可用性
Standalone
クラスタを実運用の設定で動作させている場合、仮にクラスタ内のノードのどれか
が落ちてしまったとしても、アプリケーションを受け入れられるようにしておきたいものです。
Standalone
モードは、ワーカーノードの障害を問題にならないようサポートします。クラスタの
マスターの可用性も高めたい場合には、
Apache ZooKeeper
（分散協調システム）を使って複数の
スタンバイマスターを用意しておけば、
Spark
は障害があった場合の新しいマスターへの切り替
えをサポートします。
ZooKeeper
を使った
Standalone
クラスタの設定は本書の範囲を超えていま
すが、
Spark
の公式ドキュメンテーションに記載されています（ ...
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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.