在hadoop環境配置完成後,運行第一個例子程序:
1,創建文件
#echo "hello world" >> test1.txt
#echo "hello hadoop" >> test2.txt
2,上傳文件到hdfs
#cd ../hadoop
#bin/hadoop dfs -put ../input in
#bin/hadoop dfs -ls ./in/*
3,,進入/home/hadoop/src/examples/org/apache/hadoop/examples
4,創建test目錄
#mkdir test
5,編譯
#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,運行
#/home/hadoop/bin/hadoop jar wordcount.jar org.apache.hadoop.examples.WordCount input test
8,查看結果
bin/hadoop dfsadmin -report