1.å¦ä½å¨hadoop-2.6.0ä¸ç¼è¯è¿è¡èªå·±ç¼åçjava代ç
2.Win7 64位系统安装hadoop2.2.0的源码方法
3.å¦ä½ç¼åhadoop javaç¨åº
4.å¦ä½å¨win7ä¸çeclipseä¸è°è¯Hadoop2.2.0çç¨åº
å¦ä½å¨hadoop-2.6.0ä¸ç¼è¯è¿è¡èªå·±ç¼åçjava代ç
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HADOOP_HOME/share/hadoop/.wan.demo;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
public class HADemo {
public static void main(String[] args) {
// TODO Auto-generated method stub
mkdir(args[0]);
}
public static void mkdir(String dir){
Configuration configuration=new Configuration();
FileSystem fs;
try {
fs = FileSystem.get(configuration);
fs.mkdirs(new Path(dir));
fs.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
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é ç½®HADOOP_HOME/binå°ç¯å¢ä¸ï¼å¯å¨é群ï¼è¿å ¥HADemo.javaæ件ç®å½ä¸
注:ä¸é¢çlibç®å½éé¢çæ件ç±HADOOP_HOME/share/hadoop/mon-2.2.0.jar:lib/hadoop-annotations-2.2.0.jar -d class HADemo.java
2.çæjarå
#jar -cvf hademo.jar -C class/ .
added manifest
adding: com/(in = 0) (out= 0)(stored 0%)
adding: com/wan/(in = 0) (out= 0)(stored 0%)
adding: com/wan/demo/(in = 0) (out= 0)(stored 0%)
adding: com/wan/demo/HADemo.class(in = ) (out= )(deflated %)
3.æµè¯è¿è¡
#hadoop jar hademo.jar com.wan.demo.HADemo /test
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#hadoop fs -ls /
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Win7 位系统安装hadoop2.2.0的方法
Hadoop是一个开源框架,它允许在整个集群使用简单编程模型计算机的分布式环境存储并处理大数据,但是源码许多用户并不知道要怎么安装hadoop2.2.0,为了帮助大家更好的源码操作,现在给大家带来Win7 位系统安装hadoop2.2.0的源码小坏源码网详细方法供大家参考。
1、源码配置Cygwin环境变量PATH.把Cygwin安装目录下的源码phplaravel源码,bin目录以入 usrsbin目录,源码都添加到PATH中;
2、源码启动Cygwin.bat ,源码打开如下命令行;
3、源码例如hadoop安装包放在分区D:下,源码则解压的源码命令为$ tar -zxvf /cygdrive/d/hadoop-0..2.tar.gz,解压后可使用ls命令查看(默认解压目录为。Cygwin安装目录);
4、源码sparkdebug源码编辑hadoop-2.6.0/etc/hadoop/hadoop-env.sh,源码将export JAVA_HOME=${ JAVA_HOME}更改为自己电脑上的安装目录;
5。依次编辑hadoop-2.6.0/etc/hadoop/目录下的源码core-site.xmlhdfs-site.xml文件;
6、执行ssh-host-config命令,linuxtty源码然后按下图上的选择输入:
当提示Doyouwanttouseadifferentname? 输入yes,这步是配置安装的sshd服务,以哪个用户登录,相关源码默认是cyg_server这个用户,这里就不事先新建cyg_server这个用户,用当 前本机的超管本地用户:chenx,后续根据提示,2次输入这个账户的密码。
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ãã1.ç¼è¯java
ãã# mkdir class
ãã#Javac -classpath .:lib/hadoop-common-2.2.0.jar:lib/hadoop-annotations-2.2.0.jar -d class HADemo.java
ãã2.çæjarå
ãã#jar -cvf hademo.jar -C class/ .
ããadded manifest
ããadding: com/(in = 0) (out= 0)(stored 0%)
ããadding: com/wan/(in = 0) (out= 0)(stored 0%)
ããadding: com/wan/demo/(in = 0) (out= 0)(stored 0%)
ããadding: com/wan/demo/HADemo.class(in = ) (out= )(deflated %)
ãã3.æµè¯è¿è¡
ãã#hadoop jar hademo.jar com.wan.demo.HADemo /test
ããæ£æµï¼
ãã#hadoop fs -ls /
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1 eclipse Juno Service Release 4.2çæ¬
2 æä½ç³»ç» Windows7
3 hadoopçeclipseæ件 hadoop-eclipse-plugin-2.2.0.jar
4 hadoopçé群ç¯å¢ èææºLinuxçCentos6.5åæºä¼ªåå¸å¼
5 è°è¯ç¨åº Hellow World
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Java代ç
java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.
解å³åæ³:
å¨org.apache.hadoop.util.Shellç±»çcheckHadoopHome()æ¹æ³çè¿åå¼éååºå®ç
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Java代ç private static String checkHadoopHome() {
// first check the Dflag hadoop.home.dir with JVM scope
//System.setProperty("hadoop.home.dir", "...");
String home = System.getProperty("hadoop.home.dir");
// fall back to the system/user-global env variable
if (home == null) {
home = System.getenv("HADOOP_HOME");
}
try {
// couldn't find either setting for hadoop's home directory
if (home == null) {
throw new IOException("HADOOP_HOME or hadoop.home.dir are not set.");
}
if (home.startsWith("\"") && home.endsWith("\"")) {
home = home.substring(1, home.length()-1);
}
// check that the home setting is actually a directory that exists
File homedir = new File(home);
if (!homedir.isAbsolute() || !homedir.exists() || !homedir.isDirectory()) {
throw new IOException("Hadoop home directory " + homedir
+ " does not exist, is not a directory, or is not an absolute path.");
}
home = homedir.getCanonicalPath();
} catch (IOException ioe) {
if (LOG.isDebugEnabled()) {
LOG.debug("Failed to detect a valid hadoop home directory", ioe);
}
home = null;
}
//åºå®æ¬æºçhadoopå°å
home="D:\\hadoop-2.2.0";
return home;
}
第äºä¸ªå¼å¸¸ï¼Could not locate executable D:\Hadoop\tar\hadoop-2.2.0\hadoop-2.2.0\bin\winutils.exe in the Hadoop binaries. æ¾ä¸å°winä¸çæ§è¡ç¨åºï¼å¯ä»¥å»ä¸è½½binå ï¼è¦çæ¬æºçhadoopè·ç®å½ä¸çbinå å³å¯
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Java代ç Exception in thread "main" java.lang.IllegalArgumentException: Wrong FS: hdfs://...:/user/hmail/output/part-, expected: file:///
at org.apache.hadoop.fs.FileSystem.checkPath(FileSystem.java:)
at org.apache.hadoop.fs.RawLocalFileSystem.pathToFile(RawLocalFileSystem.java:)
at org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:)
at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:)
at org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSInputChecker.<init>(ChecksumFileSystem.java:)
at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:)
at com.netease.hadoop.HDFSCatWithAPI.main(HDFSCatWithAPI.java:)
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Java代ç Exception in thread "main" java.lang.UnsatisfiedLinkError: org.apache.hadoop.io.nativeio.NativeIO$Windows.access0(Ljava/lang/String;I)Z
åºç°è¿ä¸ªå¼å¸¸ï¼ä¸è¬æ¯ç±äºHADOOP_HOMEçç¯å¢åéé ç½®çæé®é¢ï¼å¨è¿éæ£ä»ç¹å«è¯´æä¸ä¸ï¼å¦ææ³å¨Winä¸çeclipseä¸æåè°è¯Hadoop2.2ï¼å°±éè¦å¨æ¬æºçç¯å¢åéä¸ï¼æ·»å å¦ä¸çç¯å¢åéï¼
ï¼1ï¼å¨ç³»ç»åéä¸ï¼æ°å»ºHADOOP_HOMEåéï¼å±æ§å¼ä¸ºD:\hadoop-2.2.0.ä¹å°±æ¯æ¬æºå¯¹åºçhadoopç®å½
(2)å¨ç³»ç»åéçPathéï¼è¿½å %HADOOP_HOME%/binå³å¯
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Java代ç package com.qin.wordcount;
import java.io.IOException;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
/***
*
* Hadoop2.2.0æµè¯
* æ¾WordCountçä¾å
*
* @author qindongliang
*
* hadoopææ¯äº¤æµç¾¤ï¼
*
*
* */
public class MyWordCount {
/**
* Mapper
*
* **/
private static class WMapper extends Mapper<LongWritable, Text, Text, IntWritable>{
private IntWritable count=new IntWritable(1);
private Text text=new Text();
@Override
protected void map(LongWritable key, Text value,Context context)
throws IOException, InterruptedException {
String values[]=value.toString().split("#");
//System.out.println(values[0]+"========"+values[1]);
count.set(Integer.parseInt(values[1]));
text.set(values[0]);
context.write(text,count);
}
}
/**
* Reducer
*
* **/
private static class WReducer extends Reducer<Text, IntWritable, Text, Text>{
private Text t=new Text();
@Override
protected void reduce(Text key, Iterable<IntWritable> value,Context context)
throws IOException, InterruptedException {
int count=0;
for(IntWritable i:value){
count+=i.get();
}
t.set(count+"");
context.write(key,t);
}
}
/**
* æ¹å¨ä¸
* (1)shellæºç éæ·»å checkHadoopHomeçè·¯å¾
* (2)è¡ï¼FileUtilséé¢
* **/
public static void main(String[] args) throws Exception{
// String path1=System.getenv("HADOOP_HOME");
// System.out.println(path1);
// System.exit(0);
JobConf conf=new JobConf(MyWordCount.class);
//Configuration conf=new Configuration();
//conf.set("mapred.job.tracker","...:");
//读åpersonä¸çæ°æ®å段
// conf.setJar("tt.jar");
//注æè¿è¡ä»£ç æ¾å¨æåé¢ï¼è¿è¡åå§åï¼å¦åä¼æ¥
/**Jobä»»å¡**/
Job job=new Job(conf, "testwordcount");
job.setJarByClass(MyWordCount.class);
System.out.println("模å¼ï¼ "+conf.get("mapred.job.tracker"));;
// job.setCombinerClass(PCombine.class);
// job.setNumReduceTasks(3);//设置为3
job.setMapperClass(WMapper.class);
job.setReducerClass(WReducer.class);
job.setInputFormatClass(TextInputFormat.class);
job.setOutputFormatClass(TextOutputFormat.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(IntWritable.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(Text.class);
String path="hdfs://...:/qin/output";
FileSystem fs=FileSystem.get(conf);
Path p=new Path(path);
if(fs.exists(p)){
fs.delete(p, true);
System.out.println("è¾åºè·¯å¾åå¨ï¼å·²å é¤ï¼");
}
FileInputFormat.setInputPaths(job, "hdfs://...:/qin/input");
FileOutputFormat.setOutputPath(job,p );
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}
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Java代ç INFO - Configuration.warnOnceIfDeprecated() | mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
模å¼ï¼ local
è¾åºè·¯å¾åå¨ï¼å·²å é¤ï¼
INFO - Configuration.warnOnceIfDeprecated() | session.id is deprecated. Instead, use dfs.metrics.session-id
INFO - JvmMetrics.init() | Initializing JVM Metrics with processName=JobTracker, sessionId=
WARN - JobSubmitter.copyAndConfigureFiles() | Hadoop command-line option parsing not performed. Implement the Tool interface and execute your application with ToolRunner to remedy this.
WARN - JobSubmitter.copyAndConfigureFiles() | No job jar file set. User classes may not be found. See Job or Job#setJar(String).
INFO - FileInputFormat.listStatus() | Total input paths to process : 1
INFO - JobSubmitter.submitJobInternal() | number of splits:1
INFO - Configuration.warnOnceIfDeprecated() | user.name is deprecated. Instead, use mapreduce.job.user.name
INFO - Configuration.warnOnceIfDeprecated() | mapred.output.value.class is deprecated. Instead, use mapreduce.job.output.value.class
INFO - Configuration.warnOnceIfDeprecated() | mapred.mapoutput.value.class is deprecated. Instead, use mapreduce.map.output.value.class
INFO - Configuration.warnOnceIfDeprecated() | mapreduce.map.class is deprecated. Instead, use mapreduce.job.map.class
INFO - C
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