實作一： Hadoop Standard Alone Mode

範例一：使用 cat 當 mapper，使用 wc 當 reducer

• 用 Standard Alone Mode 跑 hadoop code ( using streaming example )
  • core-site.xml, hdfs-site.xml, mapred-site.xml 皆空白即可

hadoop@lucid:~$ cd /opt/hadoop
hadoop@lucid:/opt/hadoop$ bin/hadoop jar ./contrib/streaming/hadoop-0.20.2-streaming.jar -input input -output output -mapper /bin/cat -reducer /usr/bin/wc

• 比較：使用 單機安裝模式

  hadoop@lucid:~$ cd /opt/hadoop
  // 設定 core-site.xml, hdfs-site.xml, mapred-site.xml
  hadoop@lucid:/opt/hadoop$ bin/hadoop namenode -format
  hadoop@lucid:/opt/hadoop$ bin/start-all.sh
  hadoop@lucid:/opt/hadoop$ bin/hadoop fs -put conf input
  hadoop@lucid:/opt/hadoop$ bin/hadoop jar ./contrib/streaming/hadoop-0.20.2-streaming.jar -input input -output output -mapper /bin/cat -reducer /usr/bin/wc