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.
205
10.5 入力ソース
10-27
Java
DStream
SequenceFile
ー
JavaPairDStream<Text, LongWritable> writableDStream = ipDStream.mapToPair(
new PairFunction<Tuple2<String, Long>, Text, LongWritable>() {
public Tuple2<Text, LongWritable> call(Tuple2<String, Long> e) {
return new Tuple2(new Text(e._1()), new LongWritable(e._2()));
}});
class OutFormat extends SequenceFileOutputFormat<Text, LongWritable> {};
writableDStream.saveAsHadoopFiles(
"outputDir", "txt", Text.class, LongWritable.class, OutFormat.class);
最後に、汎用の出力操作である
foreachRDD()
を使えば、任意の演算処理を
DStream
内の
RDD
群に対して実行できます。これは、それぞれの
RDD
に対して処理を行えるという点で、
transform()
に似ています。
foreachRDD()
では、
Spark
で使えるすべてのアクションを再利用でき ...
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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.