用指令編譯 Hadoop 程式碼

WordCount1 練習

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$ cd /opt/hadoop
$ mkdir -p input_local
$ bin/hadoop fs -mkdir input_hdfs
$ echo "I like NCHC Cloud Course." > input_local/input1
$ echo "I like nchc Cloud Course, and we enjoy this course." > input_local/input2
$ bin/hadoop fs -put input_local/* input_hdfs
$ bin/hadoop fs -ls input_hdfs
$ wget http://trac.nchc.org.tw/cloud/raw-attachment/wiki/jazz/Hadoop_Lab6/WordCount.java
$ mkdir MyJava
$ javac -classpath hadoop-*-core.jar -d MyJava WordCount.java
$ jar -cvf wordcount.jar -C MyJava .
$ bin/hadoop jar wordcount.jar WordCount input_hdfs/ output_hdfs/
$ bin/hadoop fs -cat output_hdfs/part-00000