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courses:mapreduce-tutorial:step-12 [2012/01/25 21:29]
straka 		courses:mapreduce-tutorial:step-12 [2012/01/29 14:55]
majlis
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 ===== Reduce-less jobs ===== ===== Reduce-less jobs =====
 If a MR job runs without reducers, the output of mappers is written to output directory without further processing. In this case, environmental variable ''HADOOP_WORK_OUTPUT_PATH'' is present even in a mapper and the files created in this directory are copied to the job output directory. If a MR job runs without reducers, the output of mappers is written to output directory without further processing. In this case, environmental variable ''HADOOP_WORK_OUTPUT_PATH'' is present even in a mapper and the files created in this directory are copied to the job output directory.
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 +<html>
 +<table style="width:100%">
 +<tr>
 +<td style="text-align:left; width: 33%; "></html>[[step-11|Step 11]]: Initialization and cleanup of MR tasks, performance of combiners.<html></td>
 +<td style="text-align:center; width: 33%; "></html>[[.|Overview]]<html></td>
 +<td style="text-align:right; width: 33%; "></html>[[step-13|Step 13]]: Sorting.<html></td>
 +</tr>
 +</table>
 +</html>
  

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