hadoop writable类的相关内容

hadoop中典型Writable类详解

Hadoop将很多Writable类归入org.apache.hadoop.io包中，在这些类中，比较重要的有Java基本类、Text、Writable集合、ObjectWritable等，重点介绍Java基本类和ObjectWritable的实现。 1. Java基本类型的Writable封装目...

hadoop中实现定制Writable类

Hadoop中有一套Writable实现可以满足大部分需求，但是在有些情况下，我们需要根据自己的需要构造一个新的实现，有了定制的Writable，我们就可以完全控制二进制表示和排序顺序。为了演示如何新建一个定制的writable类型，我们需要写一个表示一对字符串的实现： blic class Te...

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hadoop中的序列化与Writable类

hadoop中自带的org.apache.hadoop.io包中有广泛的writable类可供选择，它们形成下图所示的层次结构： java基本类型的Writable封装器 Writable类对java基本类型提供封装，short和char除外，所有的封装包含get()和set()两个方法用于读取或设...

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