锟斤拷锟斤拷位锟矫ｏ拷锟斤拷页 > 锟斤拷锟斤拷锟教筹拷 > 锟教筹拷 > 锟斤拷锟斤拷锟斤拷锟斤拷锟紿adoop锟斤拷IntelliJ IDEA远锟斤拷锟斤拷锟接凤拷锟斤拷锟斤拷锟斤拷Hadoop锟斤拷锟斤拷WordCount

锟斤拷锟斤拷锟斤拷锟斤拷锟紿adoop锟斤拷IntelliJ IDEA远锟斤拷锟斤拷锟接凤拷锟斤拷锟斤拷锟斤拷Hadoop锟斤拷锟斤拷WordCount

锟斤拷源锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷|锟斤拷时锟戒：2024-11-16 10:27:12 |锟斤拷锟侥讹拷锟斤拷99锟斤拷|锟斤拷锟斤拷签锟斤拷 Te a T DC 锟斤拷锟斤拷锟斤拷 El C in 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 EA Intel word 锟斤拷 |锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷戏

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟侥达拷锟斤拷锟捷ｏ拷锟斤拷为一锟斤拷Hadoop锟斤拷锟斤拷锟街ｏ拷锟斤拷也锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷探锟街革拷锟接的底诧拷原锟斤拷锟斤拷锟斤拷耍锟斤拷锟狡拷锟斤拷碌锟斤拷氐锟斤拷锟斤拷锟角达拷实锟绞诧拷锟斤拷锟斤拷锟斤拷锟斤拷实锟斤拷锟侥角度筹拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷锟剿斤拷锟斤拷锟斤拷锟接︼拷玫幕锟斤拷锟斤拷锟斤拷獭锟斤拷锟斤拷墙锟酵拷锟揭伙拷锟斤拷锟斤拷锟侥帮拷锟斤拷锟斤拷锟斤拷WordCounter锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷拧锟斤拷锟斤拷锟剿碉拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷目锟斤拷锟角达拷一锟斤拷锟侥憋拷锟侥硷拷锟叫讹拷取每一锟叫ｏ拷统锟斤拷锟斤拷锟叫碉拷锟绞筹拷锟街碉拷频锟绞ｏ拷锟斤拷锟斤拷锟斤拷锟揭伙拷锟酵筹拷平锟斤拷锟斤拷锟斤拷锟斤拷锟较匡拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷坪锟斤拷锟斤拷眩锟斤拷暇锟斤拷锟斤拷锟斤拷诒锟斤拷锟斤拷锟絁ava锟斤拷锟斤拷涂锟斤拷院锟斤拷锟斤拷傻锟绞碉拷帧锟�

然锟斤拷锟斤拷实锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟剿简单★拷锟斤拷然锟斤拷锟斤拷锟杰癸拷锟斤拷一台锟斤拷锟斤拷锟斤拷锟酵拷锟斤拷虻サ锟絁ava锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷频锟斤拷锟斤拷瘢锟斤拷诖锟斤拷锟斤拷莸某锟斤拷锟斤拷拢锟斤拷锟斤拷锟斤拷锟皆对讹拷锟斤拷锟揭惶拷锟斤拷锟斤拷芄锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟绞憋拷锟斤拷锟斤拷锟斤拷锟斤拷锟揭惶拷锟斤拷锟斤拷募锟斤拷锟斤拷锟皆达拷锟斤拷薹锟接︼拷锟斤拷哟锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟角分诧拷式锟斤拷锟斤拷痛娲拷锟斤拷锟斤拷锟斤拷锟揭拷锟斤拷锟斤拷凇锟斤拷植锟绞斤拷锟斤拷憬拷锟斤拷锟斤拷锟轿拷锟斤拷锟斤拷锟斤拷锟今，诧拷锟斤拷锟矫讹拷台锟斤拷锟斤拷协同锟斤拷锟斤拷锟斤拷锟接讹拷实锟街革拷效锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟捷ｏ拷锟斤拷锟街诧拷式锟芥储锟斤拷锟斤拷越锟斤拷锟斤拷锟斤拷蟹植锟斤拷娲拷诙锟斤拷锟节碉拷锟较ｏ拷锟斤拷锟斤拷锟斤拷荽娲拷头锟斤拷实锟狡匡拷锟斤拷锟�

零基础入门Hadoop：IntelliJ IDEA远程连接服务器中Hadoop运行WordCount

锟斤拷耍锟酵拷锟斤拷锟斤拷锟侥斤拷锟杰ｏ拷锟斤拷希锟斤拷锟杰癸拷锟斤拷锟斤拷掖锟揭伙拷锟斤拷虻サ锟斤拷锟斤拷映锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟捷达拷锟斤拷锟斤拷锟斤拷谓锟斤拷锟紿adoop锟斤拷锟斤拷锟侥分诧拷式锟斤拷埽锟斤拷锟斤拷锟叫э拷亟锟斤拷锟斤拷锟斤拷菁锟斤拷锟酵存储锟斤拷

锟斤拷锟斤拷准锟斤拷

Hadoop锟斤拷装

锟斤拷锟斤拷锟揭诧拷太喜锟斤拷锟节憋拷锟斤拷 Windows 系统锟较斤拷锟叫帮拷装锟斤拷锟斤拷为锟斤拷锟截伙拷锟斤拷锟斤拷通锟斤拷锟斤拷锟斤拷酆芏嗖伙拷锟揭拷锟斤拷募锟斤拷锟斤拷锟斤拷茫锟斤拷锟斤拷芑锟接帮拷锟较低筹拷母删锟斤拷锟斤拷锟斤拷锟斤拷取锟斤拷锟剿ｏ拷锟斤拷示锟斤拷锟截点将锟斤拷锟斤拷锟斤拷 Linux 锟斤拷锟斤拷锟斤拷为锟斤拷锟侥伙拷锟斤拷锟较ｏ拷通锟斤拷 Docker 实锟街匡拷锟劫诧拷锟斤拷

锟斤拷锟角斤拷锟斤拷锟矫憋拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷式锟斤拷装锟斤拷只锟斤拷通锟斤拷锟津单的诧拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟教ｏ拷锟斤拷去锟街讹拷锟斤拷锟斤拷锟斤拷锟斤拷榉筹拷锟斤拷冒锟阶帮拷锟矫革拷锟接憋拷莺涂锟斤拷佟锟�

零基础入门Hadoop：IntelliJ IDEA远程连接服务器中Hadoop运行WordCount

锟斤拷锟脚端匡拷

锟斤拷锟斤，系统锟斤拷锟斤拷锟窖撅拷锟斤拷锟解开锟斤拷锟剿诧拷锟街端口ｏ拷锟斤拷锟斤拷 9870 锟斤拷锟节凤拷锟斤拷 Web UI 锟斤拷锟芥，锟斤拷锟斤拷一锟斤拷锟斤拷要锟侥端匡拷 8020 锟斤拷没锟叫匡拷锟脚★拷锟斤拷锟斤拷丝锟斤拷锟斤拷锟斤拷锟斤拷锟揭拷锟斤拷锟斤拷氐锟� IntelliJ IDEA 锟斤拷锟斤拷锟斤拷锟接猴拷使锟矫的ｏ拷锟斤拷吮锟斤拷锟斤拷侄锟斤拷锟斤拷卸锟斤拷锟斤拷锟斤拷锟矫ｏ拷确锟斤拷锟矫端匡拷锟杰癸拷锟斤拷锟斤拷锟斤拷锟绞★拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷圆慰锟斤拷锟斤拷锟绞撅拷锟酵硷拷锟斤拷锟斤拷锟斤拷茫锟斤拷员锟剿筹拷锟斤拷锟斤拷锟斤拷锟接★拷

零基础入门Hadoop：IntelliJ IDEA远程连接服务器中Hadoop运行WordCount

锟斤拷锟斤拷锟斤拷丫锟斤拷晒锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟矫ｏ拷锟斤拷么锟斤拷时锟斤拷应锟斤拷锟杰癸拷顺锟斤拷锟斤拷锟绞诧拷锟介看 Web 页锟芥。锟斤拷图锟斤拷示锟斤拷

零基础入门Hadoop：IntelliJ IDEA远程连接服务器中Hadoop运行WordCount

锟斤拷目锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷目

锟斤拷锟角匡拷锟斤拷直锟接达拷锟斤拷一锟斤拷锟铰碉拷锟斤拷目锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷目锟斤拷锟斤拷锟街讹拷锟斤拷锟斤拷锟斤拷氐锟斤拷锟侥匡拷锟较拷锟斤拷锟斤拷锟� groupId 锟斤拷 artifactId 锟斤拷 version 锟饺伙拷锟斤拷锟斤拷锟矫★拷为锟斤拷确锟斤拷锟斤拷锟斤拷锟皆猴拷锟饺讹拷锟皆ｏ拷锟斤拷锟斤拷选锟斤拷使锟斤拷 JDK 8 锟斤拷为锟斤拷锟斤拷锟斤拷锟斤拷锟芥本锟斤拷

零基础入门Hadoop：IntelliJ IDEA远程连接服务器中Hadoop运行WordCount

锟斤拷锟饺ｏ拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟介看一锟斤拷锟斤拷目锟斤拷锟侥硷拷目录锟结构锟斤拷锟皆憋拷锟斤拷锟斤拷锟斤拷锟侥匡拷锟斤拷锟街拷锟绞斤拷锟斤拷募锟斤拷植锟斤拷锟揭伙拷锟斤拷锟斤拷锟斤拷锟斤拷私狻�

tree /f 锟斤拷锟斤拷直锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷input
锟斤拷      test.txt
锟斤拷锟斤拷output
锟斤拷锟斤拷src
锟斤拷  锟斤拷锟斤拷main
锟斤拷  锟斤拷  锟斤拷锟斤拷java
锟斤拷  锟斤拷  锟斤拷  锟斤拷锟斤拷org
锟斤拷  锟斤拷  锟斤拷      锟斤拷锟斤拷xiaoyu
锟斤拷  锟斤拷  锟斤拷              InputCountMapper.java
锟斤拷  锟斤拷  锟斤拷              Main.java
锟斤拷  锟斤拷  锟斤拷              WordsCounterReducer.java
锟斤拷  锟斤拷  锟斤拷
锟斤拷  锟斤拷  锟斤拷锟斤拷resources
锟斤拷  锟斤拷          core-site.xml
锟斤拷  锟斤拷          log4j.xml

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟角斤拷实锟街达拷锟斤拷锟斤拷锟叫的撅拷锟斤拷示锟斤拷锟斤拷锟斤拷"Hello, World!" 锟斤拷锟斤拷也锟斤拷锟斤拷锟斤拷锟斤拷通锟斤拷锟斤拷说锟斤拷 WordCounter锟斤拷为锟斤拷实锟斤拷锟斤拷锟斤拷锟斤拷埽锟斤拷锟斤拷龋锟斤拷锟斤拷锟斤拷锟揭拷锟叫� MapReduce 锟斤拷锟斤拷锟斤拷 Map 锟阶段ｏ拷锟斤拷要锟斤拷锟斤拷锟斤拷锟角斤拷锟斤拷锟斤拷锟斤拷募锟斤拷锟斤拷薪锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷莘纸獠⒆拷锟斤拷锟斤拷泄锟斤拷傻母锟绞斤拷锟斤拷锟斤拷纾拷锟斤拷屎锟斤拷锟斤拷锟街达拷锟斤拷锟侥硷拷值锟皆ｏ拷锟斤拷锟斤拷锟脚ｏ拷锟斤拷 Reduce 锟阶段ｏ拷锟斤拷锟角伙拷锟� Map 锟阶讹拷锟斤拷锟斤拷锟斤拷锟斤拷萁锟斤拷谢锟斤拷芎锟酵筹拷疲锟斤拷锟斤拷盏玫锟斤拷锟斤拷锟斤拷锟揭拷锟酵筹拷平锟斤拷锟斤拷锟斤拷锟斤拷每锟斤拷锟斤拷锟绞的筹拷锟街达拷锟斤拷锟斤拷

锟斤拷锟解，锟斤拷锟角伙拷锟斤拷要锟斤拷写一锟斤拷锟斤拷锟斤拷锟洁—锟斤拷Job 锟洁，锟斤拷锟斤拷锟斤拷锟矫猴拷锟斤拷锟斤拷 MapReduce 锟斤拷锟斤拷确锟斤拷 Map 锟斤拷 Reduce 锟阶段碉拷锟斤拷锟斤拷锟杰癸拷顺锟斤拷锟斤拷锟叫★拷通锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟教碉拷实锟街ｏ拷锟斤拷锟角撅拷锟斤拷锟斤拷锟揭伙拷锟斤拷锟斤拷锟斤拷锟� WordCounter 锟斤拷锟津，从讹拷锟斤拷锟斤拷锟斤拷 MapReduce 锟侥猴拷锟斤拷思锟斤拷锟斤拷应锟矫★拷

pom锟斤拷锟斤拷

锟斤拷锟斤拷没锟斤拷什么锟斤拷说锟侥ｏ拷直锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷桑锟�


    org.apache.hadoop
    hadoop-common
    3.2.0


    org.apache.hadoop
    hadoop-hdfs
    3.2.0


    log4j
    log4j
    1.2.17


    org.apache.hadoop
    hadoop-client
    3.2.0




    org.apache.hadoop
    hadoop-mapreduce-client-core
    3.2.0


    org.apache.hadoop
    hadoop-mapreduce-client-common
    3.2.0

core-site.xml

锟斤拷锟斤拷锟斤拷锟矫碉拷锟斤拷锟斤拷远锟斤拷Hadoop锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷息锟斤拷




    
        fs.defaultFS
        hdfs://锟斤拷锟皆硷拷锟斤拷ip:8020

test.txt

锟斤拷锟角此达拷锟斤拷要锟斤拷锟斤拷示为锟斤拷锟斤拷锟斤拷瞬锟斤拷锟斤拷锟揭拷锟斤拷锟斤拷浅锟斤拷锟斤拷锟侥硷拷锟斤拷为锟剿硷拷锟斤拷示锟斤拷锟教ｏ拷锟斤拷锟节此斤拷锟结供锟斤拷一锟斤拷锟斤拷锟斤拷锟捷★拷

xiaoyu xiaoyu
cuicui ntfgh
hanhan dfb
yy yy
asd dfg
123 43g
nmao awriojd

InputCountMapper

锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷InputCountMapper锟洁。锟斤拷锟斤拷锟斤拷锟斤拷:

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;

import java.io.IOException;

public class InputCountMapper extends Mapper {
    private final static IntWritable one = new IntWritable(1);
    private Text word = new Text();

    @Override
    protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
        String line = value.toString().trim();
        for (int i = 0; i < line.split(" ").length; i++) {
            word.set(line.split(" ")[i]);
            context.write(word, one);
        }
    }
}

锟斤拷Hadoop锟斤拷MapReduce锟斤拷锟斤拷校锟叫达拷锟斤拷锟绞碉拷锟斤拷锟皆简单的ｏ拷锟截硷拷锟斤拷锟斤拷锟斤拷确锟斤拷锟斤拷投锟斤拷宸猴拷汀锟斤拷锟斤拷锟揭拷锟斤拷锟揭伙拷锟� Mapper 锟洁，锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟轿拷涠拷锟斤拷母锟斤拷锟斤拷锟斤拷锟斤拷汀锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫ｏ拷每锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟揭伙拷裕锟斤拷纬锟終-V锟斤拷锟斤拷值锟皆ｏ拷锟结构锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟剿碉拷锟斤拷锟斤拷锟斤拷锟斤拷莸锟終-V锟斤拷锟斤拷锟斤拷 LongWritable-Text 锟斤拷锟斤拷锟斤拷锟斤拷莸锟終-V锟斤拷锟酵讹拷锟斤拷为 Text-IntWritable 锟斤拷锟斤拷锟斤拷锟� LongWritable 锟斤拷 Text 锟斤拷 IntWritable 锟饺讹拷锟斤拷Hadoop锟皆讹拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷停锟斤拷锟斤拷谴锟斤拷锟斤拷瞬锟酵拷锟斤拷锟斤拷莞锟绞斤拷锟斤拷锟斤拷汀锟斤拷锟斤拷锟� String 锟斤拷Hadoop锟叫憋拷锟芥换锟斤拷 Text 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷通锟斤拷锟斤拷锟节猴拷锟斤拷锟斤拷锟� Writable 锟斤拷缀锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 Mapper 锟斤拷锟斤拷锟斤拷锟斤拷式锟斤拷锟斤拷锟斤拷锟窖撅拷锟节达拷锟斤拷锟叫讹拷锟斤拷锟剿革拷式锟斤拷锟酵★拷然锟斤拷锟斤拷锟斤拷要注锟斤拷锟斤拷牵锟斤拷锟斤拷锟斤拷锟叫达拷锟� map 锟斤拷锟斤拷锟斤拷没锟斤拷直锟接凤拷锟斤拷值锟斤拷锟洁反锟斤拷 Mapper 锟斤拷锟酵拷锟� Context 锟斤拷锟斤拷锟侥讹拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟秸斤拷锟斤拷锟�

锟斤拷耍锟斤拷锟斤拷锟街伙拷锟揭凤拷锟斤拷锟� map 锟斤拷锟斤拷锟叫斤拷锟斤拷式锟斤拷锟斤拷锟斤拷锟斤拷荽锟斤拷锟� Context 锟斤拷然锟襟交革拷 Reducer 锟斤拷锟斤拷锟斤拷锟缴★拷

WordsCounterReducer

锟斤拷一锟斤拷锟侥达拷锟斤拷锟斤拷锟铰ｏ拷

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;

import java.io.IOException;

public class WordsCounterReducer extends Reducer {
    @Override
    protected void reduce(Text key, Iterable values, Context context) throws IOException, InterruptedException {
        int sum = 0;
        for (IntWritable val : values) {
            sum += val.get();
        }
        context.write(key, new IntWritable(sum));
    }
}

锟斤拷Hadoop锟斤拷MapReduce锟斤拷锟斤拷校锟� Reduce 锟阶段碉拷写锟斤拷也锟斤拷循锟教讹拷模式锟斤拷锟斤拷锟饺ｏ拷锟斤拷锟斤拷锟斤拷要锟斤拷锟斤拷 Reducer 锟洁，锟斤拷锟斤拷锟斤拷锟斤拷母锟斤拷锟斤拷筒锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟� Mapper 锟阶段★拷锟斤拷锟侥革拷锟斤拷锟酵帮拷锟斤拷锟斤拷锟斤拷锟街碉拷锟斤拷锟斤拷汀锟斤拷锟斤拷锟街碉拷锟斤拷汀锟斤拷锟斤拷锟斤拷值锟斤拷锟斤拷锟酵★拷锟皆硷拷锟斤拷锟街碉拷锟斤拷汀锟�

锟斤拷 Reduce 锟阶段ｏ拷锟斤拷锟斤拷锟斤拷锟捷的革拷式锟斤拷锟斤拷锟斤拷锟戒化锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷值锟侥诧拷锟街ｏ拷通锟斤拷锟斤拷锟斤拷 Iterable 锟斤拷锟酵的硷拷锟较★拷锟斤拷锟斤拷浠拷锟皆拷锟斤拷牵锟� Mapper 锟阶段达拷锟斤拷时锟斤拷锟斤拷锟斤拷通锟斤拷锟斤拷每锟斤拷锟斤拷锟绞的筹拷锟街达拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷统锟斤拷锟斤拷息锟斤拷锟斤拷为1锟斤拷锟斤拷 Context 锟斤拷锟斤拷锟界，锟斤拷锟斤拷锟斤拷 Mapper 锟阶讹拷锟斤拷锟斤拷锟斤拷锟绞★拷xiaoyu锟斤拷时锟斤拷锟斤拷锟斤拷每锟轿讹拷锟斤拷锟斤拷锟揭伙拷锟� (xiaoyu, 1) 锟侥硷拷值锟皆★拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟绞★拷xiaoyu锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫筹拷锟街讹拷危锟� Context 锟斤拷锟斤拷锟叫╋拷锟街碉拷院喜锟斤拷锟揭伙拷锟� Iterable 锟斤拷锟较ｏ拷锟斤拷锟斤拷 (xiaoyu, [1, 1]) 锟斤拷锟斤拷示锟矫碉拷锟绞筹拷锟斤拷锟斤拷锟斤拷锟轿★拷

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷校锟� Reduce 锟阶段的诧拷锟斤拷锟角筹拷锟津单ｏ拷只锟斤拷要锟斤拷每锟斤拷 Iterable 锟斤拷锟斤拷锟叫碉拷值锟斤拷锟斤拷锟桔加硷拷锟缴★拷锟斤拷锟界，锟斤拷锟斤拷 xiaoyu 锟斤拷锟斤拷锟诫集锟斤拷 (xiaoyu, [1, 1]) 锟斤拷锟斤拷锟斤拷只锟斤拷要锟斤拷锟斤拷锟斤拷锟叫碉拷 1 值锟桔硷拷锟斤拷锟斤拷锟斤拷锟矫筹拷锟斤拷锟秸的斤拷锟�2锟斤拷

Main

锟斤拷锟斤拷锟斤拷锟斤拷锟揭拷锟斤拷锟揭伙拷锟絁ob锟斤拷锟斤拷锟斤拷锟斤拷锟铰ｏ拷

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

public class Main {
    static {
        try {
            System.load("E:\\hadoop.dll");//锟斤拷锟斤拷锟斤拷镁锟斤拷缘锟街凤拷锟絙in目录锟铰碉拷hadoop.dll锟侥硷拷路锟斤拷
        } catch (UnsatisfiedLinkError e) {
            System.err.println("Native code library failed to load.\n" + e);
            System.exit(1);
        }
    }


    public static void main(String[] args) throws Exception{
        Configuration conf = new Configuration(); 
        Job job = Job.getInstance(conf, "wordCounter"); 
        job.setJarByClass(Main.class);
        job.setMapperClass(InputCountMapper.class);
        job.setReducerClass(WordsCounterReducer.class);

        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);

        FileInputFormat.addInputPath(job, new Path("file:///E:/hadoop/test/input"));
        FileOutputFormat.setOutputPath(job, new Path("file:///E:/hadoop/test/output"));

        System.exit(job.waitForCompletion(true) ? 0 : 1);
    }
}

锟矫的ｏ拷锟斤拷锟斤拷锟斤拷展示锟斤拷锟斤拷一锟斤拷锟斤拷全锟教讹拷锟斤拷写锟斤拷锟斤拷锟斤拷锟斤拷实锟绞诧拷锟斤拷锟斤拷锟斤拷锟叫ｏ拷锟斤拷要锟截憋拷注锟斤拷锟斤拷牵锟斤拷锟斤拷潜锟斤拷锟酵拷锟� Windows 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷远锟教碉拷 Hadoop 锟斤拷群锟斤拷锟斤拷锟斤拷夭锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫伙拷锟斤拷锟斤拷锟杰讹拷潜锟节碉拷锟斤拷锟斤拷涂樱锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷谩锟斤拷锟斤拷印锟饺拷薜确锟斤拷妗�

锟斤拷锟斤拷锟斤拷锟斤拷锟揭斤拷锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫╋拷锟斤拷锟斤拷锟斤拷锟斤拷猓ｏ拷锟斤拷锟轿拷锟斤拷锟结供一些实锟绞的参匡拷锟斤拷指锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷腋锟剿筹拷锟斤拷锟斤拷锟缴诧拷锟斤拷锟斤拷

锟斤拷锟窖斤拷锟�

目录锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷悴拷锟斤拷锟斤拷员锟斤拷锟� Windows 目录为锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷远锟教凤拷锟斤拷锟斤拷锟较碉拷目录为锟斤拷锟斤拷锟叫诧拷锟斤拷锟斤拷锟斤拷么锟斤拷锟斤拷芑锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟铰碉拷写锟斤拷锟斤拷

FileInputFormat.addInputPath(job, new Path("/input"));
FileOutputFormat.setOutputPath(job, new Path("/output"));

锟斤拷么锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷拢锟斤拷锟斤拷潜锟斤拷锟斤拷却锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷氐锟斤拷锟斤拷锟侥柯硷拷锟絠nput锟斤拷锟斤拷锟斤拷锟斤拷要锟截憋拷注锟斤拷锟斤拷牵锟斤拷锟斤拷锟斤拷锟角帮拷锟斤拷锟斤拷锟斤拷目录锟斤拷output锟斤拷锟斤拷锟斤拷为 Hadoop 锟斤拷锟斤拷锟斤拷锟斤拷业时锟斤拷锟皆讹拷锟斤拷锟斤拷锟斤拷目录锟斤拷锟斤拷锟斤拷锟侥柯硷拷汛锟斤拷冢锟斤拷岬硷拷锟斤拷锟揭抵达拷锟绞э拷堋锟斤拷锟剿ｏ拷只锟斤拷要锟斤拷锟斤拷 Docker 锟斤拷锟斤拷锟斤拷直锟斤拷执锟斤拷锟斤拷锟斤拷锟斤拷锟筋即锟斤拷顺锟斤拷锟斤拷始锟斤拷锟斤拷锟斤拷

hdfs dfs -mkdir /input

零基础入门Hadoop：IntelliJ IDEA远程连接服务器中Hadoop运行WordCount

锟斤拷然锟斤拷锟斤拷锟斤拷一锟街革拷锟津单的凤拷式锟斤拷锟斤拷锟斤拷直锟斤拷通锟斤拷图锟轿斤拷锟斤拷锟斤拷页锟斤拷锟较达拷锟斤拷锟斤拷锟侥柯硷拷锟斤拷锟皆达拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟皆参匡拷锟斤拷锟铰诧拷锟借，锟斤拷图锟斤拷示锟斤拷

零基础入门Hadoop：IntelliJ IDEA远程连接服务器中Hadoop运行WordCount

Permission denied

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 Job 锟斤拷锟斤拷时锟斤拷系统锟斤拷锟斤拷锟斤拷锟揭伙拷锟斤拷锟斤拷源锟斤拷锟斤拷锟斤拷目录锟斤拷output锟斤拷锟斤拷然锟斤拷锟斤拷锟斤拷锟节碉拷前锟矫伙拷锟斤拷没锟斤拷锟姐够锟斤拷权锟斤拷锟斤拷锟斤拷锟叫此诧拷锟斤拷锟斤拷锟斤拷嘶锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟铰碉拷权锟睫达拷锟斤拷锟斤拷示锟斤拷 Permission denied: user=yu, access=WRITE, inode="/":root:supergroup:drwxr-xr-x 锟斤拷锟矫达拷锟斤拷锟斤拷味锟脚碉拷前锟矫伙拷锟斤拷yu锟斤拷锟斤拷图锟节革拷目录锟铰达拷锟斤拷目录锟斤拷锟侥硷拷锟斤拷锟斤拷锟斤拷锟节革拷目录锟斤拷权锟斤拷锟斤拷锟斤拷为只锟叫癸拷锟斤拷员锟斤拷root锟斤拷锟斤拷锟斤拷写锟诫，锟斤拷通锟矫伙拷锟睫凤拷锟斤拷锟斤拷写锟斤拷锟斤拷锟斤拷锟接讹拷锟斤拷锟斤拷锟斤拷业执锟斤拷失锟杰★拷

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷要锟斤拷锟斤拷docker锟斤拷锟斤拷锟斤拷执锟斤拷锟斤拷锟斤拷锟斤拷锟筋：

hadoop fs -chmod 777 /

锟斤拷锟斤拷锟斤拷锟斤拷锟较就匡拷锟斤拷顺锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷恕锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷直锟接碉拷锟斤拷锟斤拷锟介看 output 目录锟铰碉拷锟侥硷拷锟斤拷锟捷★拷锟斤拷锟斤拷锟斤拷要注锟斤拷锟斤拷牵锟斤拷锟斤拷锟斤拷锟斤拷锟矫伙拷锟斤拷锟斤拷镁锟斤拷锟斤拷 IP 锟斤拷址锟斤拷锟斤拷锟斤拷诮锟斤拷锟斤拷募锟斤拷锟斤拷锟绞憋拷锟斤拷锟斤拷锟揭拷侄锟斤拷锟斤拷募锟斤拷械锟� IP 锟斤拷址锟芥换为锟斤拷锟皆硷拷锟斤拷实锟斤拷 IP 锟斤拷址锟斤拷锟斤拷锟斤拷确锟斤拷锟斤拷锟截癸拷锟斤拷锟杰癸拷顺锟斤拷锟斤拷锟叫诧拷锟缴癸拷锟斤拷取锟斤拷锟斤拷锟斤拷募锟斤拷锟�

零基础入门Hadoop：IntelliJ IDEA远程连接服务器中Hadoop运行WordCount

锟斤拷锟斤拷锟斤拷org.apache.hadoop.io.nativeio.NativeIO$Windows

锟斤拷锟斤拷锟斤拷锟斤拷通锟斤拷锟斤拷锟斤拷锟斤拷缺锟斤拷 hadoop.dll 锟侥硷拷锟斤拷锟铰的★拷锟斤拷 Windows 系统锟斤拷锟斤拷锟斤拷 Hadoop 时锟斤拷 hadoop.dll 锟斤拷锟斤拷 winutils.exe 锟角憋拷锟斤拷锟斤拷锟斤拷锟斤拷募锟斤拷锟斤拷锟轿拷锟斤拷锟斤拷峁╋拷锟� Hadoop 锟斤拷 Windows 锟斤拷锟斤拷锟斤拷谋锟斤拷卮锟斤拷锟街э拷趾锟街达拷谢锟斤拷锟斤拷锟�

为锟斤拷确锟斤拷顺锟斤拷锟斤拷锟叫ｏ拷锟斤拷锟斤拷要锟斤拷锟截讹拷应锟芥本锟斤拷 hadoop.dll 锟斤拷锟斤拷 winutils.exe 锟侥硷拷锟斤拷锟窖撅拷为锟斤拷准锟斤拷锟斤拷锟剿讹拷锟� Hadoop 锟芥本锟斤拷应锟斤拷锟斤拷些锟侥硷拷锟斤拷锟斤拷锟叫碉拷锟侥硷拷锟斤拷锟斤拷锟皆达拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟截ｏ拷 https://github.com/cdarlint/winutils

锟斤拷锟斤拷锟斤拷锟斤拷只锟斤拷锟斤拷一锟斤拷hadoop.dll锟斤拷为锟剿诧拷锟斤拷锟斤拷锟斤拷锟皆ｏ拷直锟斤拷锟节达拷锟斤拷锟斤拷锟斤拷写锟斤拷锟斤拷

static {
  try {
      System.load("E:\\hadoop.dll");//锟斤拷锟斤拷锟斤拷镁锟斤拷缘锟街凤拷锟絙in目录锟铰碉拷hadoop.dll锟侥硷拷路锟斤拷
  } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
  }
}

锟斤拷锟斤拷锟饺伙拷锟斤拷锟斤拷猓拷蔷锟斤拷锟斤拷锟斤拷锟絯indows锟铰碉拷wsl锟斤拷系统锟斤拷

使锟斤拷Windows + R锟斤拷菁锟斤拷蚩锟斤拷锟斤拷小锟斤拷曰锟斤拷锟街达拷锟絆ptionalFeatures锟津开★拷Windows 锟斤拷锟杰★拷锟斤拷

锟斤拷选锟斤拷锟斤拷锟斤拷锟斤拷 Linux 锟斤拷 Windows 锟斤拷系统锟斤拷锟酵★拷锟斤拷锟斤拷锟狡教拷锟斤拷锟饺伙拷锟斤拷锟斤拷锟饺凤拷锟斤拷锟斤拷锟�

零基础入门Hadoop：IntelliJ IDEA远程连接服务器中Hadoop运行WordCount

锟斤拷锟斤拷效锟斤拷

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零基础入门Hadoop：IntelliJ IDEA远程连接服务器中Hadoop运行WordCount

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