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--- courses:mapreduce-tutorial:step-23 [2012/01/29 23:43]
straka
+++ courses:mapreduce-tutorial:step-23 [2012/01/31 14:33] (current)
dusek
@@ Line 27: / Line 27: @@
 The Perl API is always using strings as keys and values. From the Java point of view:
   * the type of keys and values produced by Perl API is always ''Text''.
-  * any type can be used as input to Perl API -- if the type is different from ''Text'', a ''toString'' method is used to convert the value to ''String''.
+  * any type can be used as input to Perl API -- if the type is different from ''Text'', a ''toString'' method is used to convert the value to string before the value is passed to Perl.
 ===== Input formats =====
@@ Line 40: / Line 40: @@
 ===== 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:
   * ''TextOutputFormat'': The type of both keys and values is ''Text''.
   * ''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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