hadoop-quickstart-命令行方式打包运行wordcount

本文详细介绍了在Hadoop环境下配置并运行WordCount程序的过程,包括创建文件、上传至HDFS、编译及运行程序等步骤,旨在帮助初学者快速上手Hadoop环境下的基本操作。

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在hadoop环境配置完成后,运行第一个例子程序:
1,创建文件
#echo "hello world" >> test1.txt
#echo "hello hadoop" >> test2.txt

2,上传文件到hdfs
#cd ../hadoop
#bin/hadoop dfs -put ../input in 
#bin/hadoop dfs -ls ./in/*

3,,进入/home/hadoop/src/examples/org/apache/hadoop/examples

4,创建test目录 
#mkdir test

5,编译
#javac -classpath /home/hadoop/hadoop-core-1.2.1.jar:/home/hadoop/lib/commons-cli-1.2.jar -d test WordCount.java 

6,把class文件打包成jar
jar -cvf wordcount.jar -C test/ .

7,运行
#/home/hadoop/bin/hadoop jar wordcount.jar org.apache.hadoop.examples.WordCount input test

8,查看结果
bin/hadoop dfsadmin -report
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repository\org\apache\hadoop\hadoop-yarn-api\2.8.5\hadoop-yarn-api-2.8.5.jar;D:\maven\local repository\com\sun\jersey\jersey-client\1.9\jersey-client-1.9.jar;D:\maven\local repository\com\google\inject\guice\3.0\guice-3.0.jar;D:\maven\local repository\javax\inject\javax.inject\1\javax.inject-1.jar;D:\maven\local repository\aopalliance\aopalliance\1.0\aopalliance-1.0.jar;D:\maven\local repository\com\sun\jersey\contribs\jersey-guice\1.9\jersey-guice-1.9.jar;D:\maven\local repository\com\google\inject\extensions\guice-servlet\3.0\guice-servlet-3.0.jar;D:\maven\local repository\io\netty\netty\3.6.2.Final\netty-3.6.2.Final.jar" org.example.Mapreduce.BrandAmount log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. Exception in thread "main" java.io.IOException: Cannot initialize Cluster. Please check your configuration for mapreduce.framework.name and the correspond server addresses. at org.apache.hadoop.mapreduce.Cluster.initialize(Cluster.java:143) at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:108) at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:101) at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1311) at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1307) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1844) at org.apache.hadoop.mapreduce.Job.connect(Job.java:1306) at org.apache.hadoop.mapreduce.Job.submit(Job.java:1335) at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1359) at org.example.Mapreduce.BrandAmount.main(BrandAmount.java:68) Process finished with exit code 1
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