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Hadoop Streaming is a utility which allows users to create and run jobs with any executables (e.g. shell utilities) as the mapper and/or the reducer. Usage: $HADOOP_HOME/bin/hadoop jar $HADOOP_HOME/mapred/contrib/streaming/hadoop-streaming.jar [options] Options: -input <path> DFS input file(s) for the Map step -output <path> DFS output directory for the Reduce step -mapper <cmd|JavaClassName> The
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
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Hadoopã®ãµã³ãã«ã³ã¼ãã¨è¨ãã°wordcountãããããè¦ãããªãã¨ãããã¨ã§ï¼è»¢ç½®ã¤ã³ããã¯ã¹ã®ãµã³ãã«ãä½ã£ã¦ã¿ã¾ããï¼ è»¢ç½®ã¤ã³ããã¯ã¹ä½æãMapReduceã®ã¢ãã«ã§è¡¨ãã¨ä»¥ä¸ã«ãªãã¾ãï¼googleè«æã«ç¿ã£ãæ¬ä¼¼ã³ã¼ãã§è¡¨ãã¾ãï¼ Map: åèªãã¨ã«ææ¸åãåºåãã¦ãã¾ãï¼ åèªã®åå²ãfor each wordã¨ãã¦ãã¾ããï¼æ¥æ¬èªã®å ´ååèªã®åå²ãåé¡ã§ããï¼ä»åã¯åç´ãªN-gramã§å®è£ ãã¾ããï¼ map(String key, String value): //key: æç« å //value: æç« ã®å 容 for each word w in value: EmitIntermediate(w, key); Reduce: éè¤ãåãé¤ãã ãã§ãï¼valuesã§ã½ã¼ãããã¨ãªãè¯ãããããã¾ãã reduce(String key, Iterato
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