= 實做六 =

==  == 
 
 * restart your Hadoop machine done on yesterday.
   * on node1
{{{
$ cd /opt/hadoop
$ bin/hadoop start-dfs.sh
$ ssh node02 "bin/hadoop start-mapred.sh"
}}}
   * please check hadoop status.

 == Example 1 : == 

 * upload input to hdfs

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

 * click [attachment:wiki:jazz/Hadoop_Lab6:WordCount.java?format=raw WordCount.java] and store it to /opt/hadoop

 * run this code

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

-----

 == Example 2 : ==

{{{
$ echo "\." >pattern.txt && echo "\," >>pattern.txt
$ bin/hadoop dfs -put pattern.txt ./
$ mkdir MyJava2
}}}

 * click [attachment:wiki:jazz/Hadoop_Lab6:WordCount2.java?format=raw WordCount2.java] and store it to /opt/hadoop

{{{
$ javac -classpath hadoop-*-core.jar -d MyJava2 WordCount2.java
$ jar -cvf wordcount2.jar -C MyJava2 .
$ bin/hadoop jar wordcount2.jar WordCount2 input output2 -skip pattern.txt
$ bin/hadoop dfs -cat output2/part-00000
$ bin/hadoop jar wordcount2.jar WordCount2 -Dwordcount.case.sensitive=false input output3 -skip pattern.txt
$ bin/hadoop dfs -cat output3/part-00000
}}}