hadoop类的相关内容

返回频道 hadoop类

问答 2021-12-05 来自：开发者社区

Hadoop中如何用mapreduce方法设置shuffle所使用的类？

问答 2021-12-05 来自：开发者社区

Hadoop数据类型中的Text类和NullWritable类表示什么？

问答 2021-12-05 来自：开发者社区

Hadoop数据类型中的IntWritable类和LongWritable类表示什么？

问答 2021-12-05 来自：开发者社区

Hadoop数据类型中的DoubleWritable类和FloatWritable类表示什么？

问答 2021-12-05 来自：开发者社区

Hadoop数据类型中的BooleanWritable类和ByteWritable类表示什么？

文章 2018-11-05 来自：开发者社区

E-MapReduce(Hadoop)10大类问题之集群规划

集群规划类问题所有的使用Hadoop或者打算使用Hadoop的人肯定会遇到集群规划的问题，我到底使用多大的集群规模呢?有没有一个标准呢? 本篇文章就为你介绍集群规划。在云环境E-MapReduce中，各种搭配是比较自由的。当前，cpu跟memory的比例有1：2及1：4的。磁盘是单机4快盘，从不同的性能有普通云盘、高校云盘、SSD云盘，价格也分别不同，单盘的容量也从40g到32T。对于有....

文章 2017-11-22 来自：开发者社区

Hadoop 用FileStatus类来查看HDFS中文件或目录的元信息

Hadoop中的FileStatus类可以用来查看HDFS中文件或者目录的元信息，任意的文件或者目录都可以拿到对应的FileStatus, 我们这里简单的演示下这个类的相关API： /* */ package com.charles.hadoop.fs; import java.net.URI...

文章 2017-11-22 来自：开发者社区

自定义Hadoop的可序列化类

java原生语言中要想一个自定义类可序列化，很简单，只要让这个类实现java.io.Serializable接口就可以了，但是在Hadoop框架中，要想让自定义类可以被序列化，我们必须手动让其实现WritableCompable接口并且实现write(),readFields(),compareTo()方法。下面就是一个我们自定义的可序列化的类： /* */&...

文章 2016-04-21 来自：开发者社区

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封装目前Java基本类型对应的Writable封装如下表所示。所有这些Writable类都继承自Wri.....

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开源大数据平台 E-MapReduce

开源大数据平台 E-MapReduce（简称“EMR”）是云原生开源大数据平台，向客户提供简单易集成的Hadoop、Hive、Spark、Flink、Presto、ClickHouse、StarRocks、Delta、Hudi等开源大数据计算和存储引擎服务。

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