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courses:mapreduce-tutorial:step-3 [2012/01/24 19:14] straka |
courses:mapreduce-tutorial:step-3 [2012/01/24 19:14] straka |
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| The simplest MR job consists of a mapper only. The input data is divided in several parts, every processed by an independent mapper, and the results are collected in one directory, one file per mapper. | The simplest MR job consists of a mapper only. The input data is divided in several parts, every processed by an independent mapper, and the results are collected in one directory, one file per mapper. | ||
| - | ===== Example | + | ===== Example |
| <code perl> | <code perl> | ||
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| Resulting script can be executed using | Resulting script can be executed using | ||
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| perl script.pl run input_directory output_directory | perl script.pl run input_directory output_directory | ||
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| All files in input_directory are processes. The output_directory must not exist. | All files in input_directory are processes. The output_directory must not exist. | ||