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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
Line 40: Line 40:
  
 ===== 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.
  
 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.
 +
 +----
 +
 +<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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