[Hadoop] 자바 맵리듀스 튜토리얼 java MapReduce tutorial

http://hadoop.apache.org/docs/stable/mapred_tutorial.html

클래스파일을 위한 디렉토리 생성

$ mkdir wordcount_classes 

컴파일

$ javac -classpath ${HADOOP_HOME}/hadoop-${HADOOP_VERSION}-core.jar -d wordcount_classes WordCount.java

패키징

$ jar -cvf /usr/joe/wordcount.jar -C wordcount_classes/ .

실행

$ bin/hadoop jar /usr/joe/wordcount.jar org.myorg.WordCount /usr/joe/wordcount/input /usr/joe/wordcount/output