August 2015
Intermediate to advanced
312 pages
7h 28m
Japanese
Content preview from 初めてのSpark
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97
5.5 データベース
5.5.3
HBase
Spark
は
Hadoop
の入力フォーマットを通して
HBase
にアクセスできます
†
。この入力フォー
マットは、
org.apache.hadoop.hbase.mapreduce.TableInputFormat
クラスに実装されています。
この入力フォーマットは、
org.apache.hadoop.hbase.io.ImmutableBytesWritable
型のキーと、
org.apache.hadoop.hbase.client.Result
型の値を持つキー／値ペアの集合を返します。
Result
クラスには、
API
のドキュメント（
https://hbase.apache.org/apidocs/org/apache/hadoop/
hbase/client/Result.html
）に説明されている通り、その列ファミリに基づいて値を取り出すため
のさまざまなメソッドが含まれています。
HBase
を
Spark
で利用するためには、
5-45
の
Scala
の場合のように、適切な入力フォー
マットを渡して
SparkContext.newAPIHadoopRDD
を呼びます。
5-45
HBase
Scala
import org.apache.hadoop.hbase.HBaseConfiguration
import org.apache.hadoop.hbase.client.Result
import org.apache.hadoop.hbase.io.ImmutableBytesWritable ...
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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.