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courses:mapreduce-tutorial:step-23 [2012/01/29 23:48]
straka |
courses:mapreduce-tutorial:step-23 [2012/01/31 14:33] (current)
dusek |
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| ===== Output formats ===== | ===== Output formats ===== |
| An input format is a subclass of [[http://hadoop.apache.org/common/docs/r1.0.0/api/org/apache/hadoop/mapreduce/lib/output/FileOutputFormat.html|FileOutputFormat<K,V>]], where //K// is the type of keys and //V// is the type of values it can store. | An output format is a subclass of [[http://hadoop.apache.org/common/docs/r1.0.0/api/org/apache/hadoop/mapreduce/lib/output/FileOutputFormat.html|FileOutputFormat<K,V>]], where //K// is the type of keys and //V// is the type of values it can store. |
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| Available output formats: | Available output formats: |
| * ''TextOutputFormat'': The type of both keys and values is ''Text''. | * ''TextOutputFormat'': The type of both keys and values is ''Text''. |
| * ''SequenceFileOutputFormat'': Any type of keys and values can be used. | * ''SequenceFileOutputFormat'': Any type of keys and values can be used. |
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| | <html> |
| | <table style="width:100%"> |
| | <tr> |
| | <td style="text-align:left; width: 33%; "></html>[[step-22|Step 22]]: Optional – Setting Eclipse.<html></td> |
| | <td style="text-align:center; width: 33%; "></html>[[.|Overview]]<html></td> |
| | <td style="text-align:right; width: 33%; "></html>[[step-24|Step 24]]: Mappers, running Java Hadoop jobs, combiners.<html></td> |
| | </tr> |
| | </table> |
| | </html> |
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