Hadoop 04：WordCount

hadoop
hadoop

WordCount案例。

  1. 创建文件目录

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    # bin/hdfs dfs -mkdir /test/input/

  2. 创建并编写input文件

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    # touch wc.input
    # vim wc.input
    写若干个单词，用回车或空格分开

  3. 将input文件放入input目录

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    # bin/hdfs dfs -put ./wc.input /test/input/

  4. 查看文件内容

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    # bin/hdfs dfs -text /test/input/wc.input

  5. 运行WordCount案例

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    # bin/yarn jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.8.0.jar wordcount /test/input/wc.input /test/output

  6. 查看结果

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    # bin/hdfs dfs -ls /test/output
    ound 2 items
    -rw-r--r--   1 root supergroup          0 2017-04-07 06:17 /test/output/_SUCCESS
    -rw-r--r--   1 root supergroup         50 2017-04-07 06:17 /test/output/part-r-00000

    # bin/hdfs dfs -text /test/output/part-r-00000
    hadoop	4
    hdfs	2
    hello	1
    mapreduce	1
    wor1	1
    yarn	2
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