Hadoop Mapreduce Example - WordCount.java

Other people do this without any problems. However why I can't do this!!
That because there is some missing line at blogs and web pages which I found from google. Holy shit.

You can run with this command very nicely. Your welcome? No Sweat.

wordcount.java

$ mkdir wordcount_classes
$ javac -classpath hadoop-0.20.2-core.jar -d wordcount_classes WordCount.java
$ jar cvf wordcount.jar -C wordcount_classes/ .

$ mkdir -p wordcount/input
$ echo "Hello Word Bye World" > wordcount/input/file01
$ echo "Hello Hadoop Goodbye Hadoop" > wordcount/input/file02
$ bin/hadoop fs -put wordcount/input wordcount/input
$ bin/hadoop dfs -ls wordcount/input/
Found 2 items
/usr/local/oss/hadoop-0.17.0/wordcount/input/file02     <r 1>   28      2008-08-05 01:44        rw-rw-r--       makoto  makoto
/usr/local/oss/hadoop-0.17.0/wordcount/input/file01     <r 1>   21      2008-08-05 01:45        rw-rw-r--       makoto  makoto

$ bin/hadoop dfs -cat wordcount/input/file01
Hello World By World
$ bin/hadoop dfs -cat wordcount/input/file02
Hello Hadoop GoodBye Hadoop

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

$ bin/hadoop fs -ls wordcount/output
Found 2 items
drwxr-xr-x   - root supergroup          0 2010-01-05 17:46 /user/root/wordcount/output/_logs
-rw-r--r--   2 root supergroup         41 2010-01-05 17:46 /user/root/wordcount/output/part-00000

$ bin/hadoop fs -cat wordcount/output/part-00000
Bye     1
Goodbye 1
Hadoop  2
Hello   2
World   2

Reference (Examples from below sites are not perfect)
http://gmyoul.tistory.com/11
http://code.google.com/p/newtech/wiki/HadoopMapReduceFirstStep