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<div style="text-align: center;"><big
 style="font-weight: bold;"><big><big>實做四: Hadoop 程式編譯</big></big></big></div>
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 = 練習 1 : Word Count 初級版 =

 * 上傳內容到hdfs內

{{{
$ cd /opt/hadoop
$ mkdir lab4_input
$ echo "I like NCHC Cloud Course." > lab4_input/input1
$ echo "I like nchc Cloud Course, and we enjoy this course." > lab4_input/input2
$ bin/hadoop fs -put lab4_input lab4_input
$ bin/hadoop fs -ls lab4_input
}}}

 * 編輯 [wiki:waue/2010/0115-WordCountV1 wordcount.java] 並存到/opt/hadoop;


 * 運作程式

{{{
$ mkdir MyJava
$ javac -classpath hadoop-*-core.jar -d MyJava WordCount.java
$ jar -cvf wordcount.jar -C MyJava .
$ bin/hadoop jar wordcount.jar WordCount lab4_input/ lab4_out1/
$ bin/hadoop fs -cat lab4_out1/part-00000
}}}

 * lab4_out1 執行結果 
{{{
#!text
Cloud	2
Course,	1
Course.	1
I	2
NCHC	1
and	1
course.	1
enjoy	1
like	2
nchc	1
this	1
we	1
}}}
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