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= 實作九 Lab 9 =

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<div style="text-align: center;"><big style="font-weight: bold;"><big>Hadoop Streaming 搭配不同程式語言練習<br/>Hadoop Streaming in different Language</big></big></div>
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以下練習，請連線至 hadoop.classcloud.org 操作。底下的 hXXXX 等於您的用戶名稱。
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 * 或者連線至 https://hadoop.classcloud.org 改用 web shell 執行

== 搭配現存二進位執行檔 ==
== Existing Binary ==

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~$ hadoop fs -put /etc/hadoop/conf lab9_input
~$ hadoop jar hadoop-streaming.jar -input lab9_input -output lab9_out1 -mapper /bin/cat -reducer /usr/bin/wc
~$ hadoop fs -cat lab9_out1/part-00000
}}}

== 搭配 Bash Shell Script ==

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~$ echo "sed -e \"s/ /\n/g\" | grep ." > streamingMapper.sh
~$ echo "uniq -c | awk '{print \$2 \"\t\" \$1}'" > streamingReducer.sh
~$ chmod a+x streamingMapper.sh
~$ chmod a+x streamingReducer.sh
~$ hadoop jar hadoop-streaming.jar -input lab9_input -output lab9_out2 -mapper streamingMapper.sh -reducer streamingReducer.sh -file streamingMapper.sh -file streamingReducer.sh
~$ hadoop fs -cat lab9_out2/part-00000
}}}