Hadoop Streaming

Hadoop streaming is a utility that comes with the Hadoop distribution. The utility allows you to create and run map/reduce jobs with any executable or script as the mapper and/or the reducer. For example: $HADOOP_HOME/bin/hadoop jar $HADOOP_HOME/hadoop-streaming.jar \ -input myInputDirs \ -output myOutputDir \ -mapper /bin/cat \ -reducer /bin/wc In the above example, both the mapper and the reduce

[rikima3132]

key/value pairのデフォルトdelimiterはタブ