hadoop实战 自己运行WordCount.java

首先在本地系统里

mkdir playground

mkdir playground/src

mkdir playground/classes

接着把WordCount.java COPY到playground/src

cp src/examples/org/apache/hadoop/examples/WordCount.java playground/src/WordCount.java

在本地系统里编译WordCount.java

javac -classpath hadoop-0.20.2-core.jar:lib/commons-cli-1.2.jar -d playground/classes/ playground/src/WordCount.java

cd playground/classes/

jar -cvf wordcount.jar *

在hdfs系统下

bin/hadoop jar playground/classes/wordcount.jar org.apache.hadoop.examples.WordCount input output

看成果

bin/hadoop fs -cat output/*