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IntWritable
hadoop学习笔记4
Writable接口1、对java中的int型进行封装那么就是hadoop中的
IntWritable
类,在写程序的时候可以把
IntWritable
可以看着是int类型,它实现了WritableComparable
韩悠悠
·
2013-08-20 17:00
hadoop
(转载)Hive学习笔记--Hive 高级编程
为了满足客户个性化的需求,Hive被设计成一个很开放的系统,很多内容都支持用户定制,包括:•文件格式:TextFile,SequenceFile•内存中的数据格式:JavaInteger/String,Hadoop
IntWritable
开源中国心理科主任
·
2013-08-12 08:00
hive
高级编程
hadoop-数据去重
importorg.apache.hadoop.conf.Configuration;importorg.apache.hadoop.fs.Path;importorg.apache.hadoop.io.
IntWritable
a331251021
·
2013-07-31 21:52
hadoop
Accelerating Comparison by Providing RawComparator
Built-in Writable classes such as
IntWritable
have byte-level implementation that are f
sunwinner
·
2013-07-27 21:00
comparator
Application to find the maximum temperature in the weather dataset
importorg.apache.hadoop.fs.Path; importorg.apache.hadoop.io.
IntWritable
; importorg.apache.hadoop.io.Text
s060403072
·
2013-07-12 15:00
hadoop数据类型,编程作为参考
Hadoop内置的数据类型BooleanWritable:标准布尔型数值ByteWritable:单字节数值DoubleWritable:双字节数值FloatWritable:浮点数
IntWritable
u010967382
·
2013-06-10 09:00
MultipleOutputFormat多文件输出
importorg.apache.hadoop.conf.Configuration; importorg.apache.hadoop.fs.FileSystem; importorg.apache.hadoop.io.
IntWritable
拖鞋崽
·
2013-05-22 08:21
hadoop
hadoop mapreduce数据排序
//map将输入中的value化成
IntWritable
类型,作为输出的key publicstaticclassMapextends Mapper{ privatestaticIntWri
limiteeWALTWO
·
2013-05-07 20:00
mapreduce
排序
Hadoop学习笔记——如何把Mapper/Reducer的代码分发到节点上去。
class MaxTemperatureMapper extends MapReduceBase implements Mapper<LongWritable, Text , Text ,
IntWritable
spark_li
·
2013-04-17 20:00
hadoop
Mapreduce程序出错解决办法
【错误1】描述:java.io.IOException:Typemismatchinvaluefrommap:expectedorg.apache.hadoop.io.
IntWritable
,recievedorg.apache.hadoop.io.Text
wisgood
·
2013-04-08 16:00
Hadoop I/O系统介绍
尤其是在介绍Hadoop的MapReduce编程之前,首先必须了解下Hadoop的I/O知识,要不一看到
IntWritable
、LongWritable、Text、NullWritable等概念就有点犯晕
miaosu
·
2013-03-07 00:00
序列化
Writable
hadoopI/O
hadoop权威指南--气温最大值所遇到的--内部类为静态的问题
static class MaxTemperatureMapper extends MapReduceBase implements Mapper<LongWritable, Text, Text,
IntWritable
代码生活
·
2013-02-06 11:00
hadoop
hadoop 源码阅读之io篇
一、基本数据类型Hadoop中,并没有使用java自带的基本类型类(Integer、Float等)而是使用了自己开发的类
IntWritable
、FloatWritable、BooleanWritable
zyy5411
·
2012-11-08 14:00
hadoop 单机下运行wordcount
:wordcuntimport java.io.IOException; import java.util.StringTokenizer; import org.apache.hadoop.io.
IntWritable
zzhuwanpeng
·
2012-10-10 19:44
hadoop
运行
wordcount
hadoop 单机下运行wordcount
import java.io.IOException; import java.util.StringTokenizer; import org.apache.hadoop.io.
IntWritable
zzhuwanpeng
·
2012-10-10 19:44
hadoop
wordcount
运行
hadoop里的MaxTemperature程序
importjava.io.IOException; importorg.apache.hadoop.fs.Path; importorg.apache.hadoop.io.
IntWritable
;
zjml2412
·
2012-08-28 18:00
java.io.IOException:Typemismatch in key from map:expected org.apache.hadoop.io
nbsp; job.setMapOutputKeyClass(
IntWritable
.class
Genie13
·
2012-08-14 20:00
exception
ArrayWritable的使用方式
Say you have an array of
IntWritable
[].
qiuqiang1985
·
2012-08-06 10:00
table
hadoop mapreducce: wrong key class
内容如下:java.io.IOException:wrongkeyclass:classorg.apache.hadoop.io.Textisnotclassorg.apache.hadoop.io.
IntWritable
fansy1990
·
2012-07-31 12:00
hadoop
key
Wrong
cla
hadoop mapreducce: wrong key class
java.io.IOException: wrong key class: class org.apache.hadoop.io.Text is not class org.apache.hadoop.io.
IntWritable
thecloud
·
2012-07-31 12:00
hadoop
hadoop mapreducce: wrong key class
java.io.IOException: wrong key class: class org.apache.hadoop.io.Text is not class org.apache.hadoop.io.
IntWritable
thecloud
·
2012-07-31 12:00
hadoop
hadoop mapreducce: wrong key class
java.io.IOException: wrong key class: class org.apache.hadoop.io.Text is not class org.apache.hadoop.io.
IntWritable
thecloud
·
2012-07-31 04:00
hadoop
Hadoop 运行过程深入分析
/* */ package com.charles.parseweather; import java.io.IOException; import org.apache.hadoop.io.
IntWritable
charles_wang888
·
2012-05-25 18:35
Hadoop
运行过程分析
Hadoop
hadoop二次排序
importorg.apache.hadoop.conf.Configuration; importorg.apache.hadoop.fs.Path; importorg.apache.hadoop.io.
IntWritable
larrylgq
·
2012-05-21 17:00
hadoop
list
String
Class
Path
import
hadoop上运行java程序
import java.util.StringTokenizer; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.
IntWritable
hao3721
·
2012-05-14 17:00
java
hadoop
hive
hdfs
编写MaxTemperature测试用例
packagecn.edu.xjtu.temperature; importjava.io.IOException; importorg.apache.hadoop.fs.Path; importorg.apache.hadoop.io.
IntWritable
amaowolf
·
2012-05-07 09:00
Hadoop之MapReduce运行理解
importjava.util.Iterator; importjava.util.StringTokenizer; importorg.apache.hadoop.fs.Path; importorg.apache.hadoop.io.
IntWritable
VLTIC
·
2012-04-06 16:00
[]hadoop自定义Counter
具体写法如下,mark一下 public static class TokenizerMapper extends Mapper<Object, Text, Text,
IntWritable
youziguo
·
2011-09-26 15:00
hadoop
mapreduce
后来才看到是我的job中设置成了mapwritable,而我的mapper中用的是
intwritable
格式,因此出现了冲突。
caoeryingzi
·
2011-08-24 16:00
IntWritable
, int
另外,在mapreduce中,values的处理,
IntWritable
是一个对象,而如果想要用int参加计算,那么我们需要调用
IntWritable
对象的一个成员get(),这个函数返回int.
caoeryingzi
·
2011-08-19 15:00
mapreduce
浏览器
ubuntu
IE
自定义Writable实现类
public class ContentWritable implements Writable{ private Text before; private
IntWritable
aronlulu
·
2011-04-01 09:00
table
hadoop自定义Counter
具体写法如下,mark一下 public static class TokenizerMapper extends Mapper<Object, Text, Text,
IntWritable
aronlulu
·
2011-03-30 11:00
hadoop
Hadoop读取本地文件运算写再写入本地
class mywordcount { public static class wordcountMapper extends Mapper<LongWritable, Text, Text,
IntWritable
king_tt
·
2011-03-07 22:00
java
hadoop
ant
git
hadoop 运行 wordcount
importjava.util.Iterator;importjava.util.StringTokenizer;importorg.apache.hadoop.fs.Path;importorg.apache.hadoop.io.
IntWritable
benbendy1984
·
2010-11-09 11:00
一个简单的hadoop/hbase程序
mapper public class OfferMapper extends TableMapper<Text,
IntWritable
> { private
pengpeng
·
2010-11-03 14:00
hadoop
hbase
UP
mapreduce的二次排序
关键是它对输入输出类型的定义:(java泛型编程) public static class Map extends Mapper<LongWritable, Text, IntPair,
IntWritable
p_x1984
·
2010-11-02 09:00
apache
mapreduce
编程
hadoop
mapreduce的二次排序
关键是它对输入输出类型的定义:(java泛型编程) public static class Map extends Mapper<LongWritable, Text, IntPair,
IntWritable
p_x1984
·
2010-11-02 09:00
apache
mapreduce
编程
hadoop
Hive-0.5中UDF和UDAF简述
Hive是一个很开放的系统,很多内容都支持用户定制,包括:a)文件格式:Text File,Sequence Fileb)内存中的数据格式: Java Integer/String, Hadoop
IntWritable
dajuezhao
·
2010-10-27 09:00
apache
mapreduce
数据结构
c
hadoop
Hive-0.5中UDF和UDAF简述
Hive是一个很开放的系统,很多内容都支持用户定制,包括: a)文件格式:Text File,Sequence File b)内存中的数据格式: Java Integer/String, Hadoop
IntWritable
085567
·
2010-08-20 09:00
apache
mapreduce
数据结构
hadoop
C#
我的那个聚类方法备忘
注意reduce(
IntWritable
key, Iterable<Text> values, Context context)函数,不是Iterator(旧版的hadoop) 2.
gushuizerotoone
·
2010-01-18 17:00
工作
hadoop
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