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--- courses:mapreduce-tutorial:step-2 [2012/01/25 21:49]
straka
+++ courses:mapreduce-tutorial:step-2 [2012/01/29 16:03]
straka
@@ Line 1: / Line 1: @@
 ====== MapReduce tutorial : Input and output format, testing data. ======
-The MapReduce framework is frequently using (key, value) pairs. These
+The MapReduce framework is frequently using (key, value) pairs. These pairs can be read from a file and written to a file and there are several formats available.
-pairs can be read from a file and written to a file and there are several formats available.
 ===== Input formats =====
@@ Line 20: / Line 19: @@
   * ''/home/straka/wiki/cs-seq-medium'' -- compressed SequenceFile of Czech Wikipedia, 8MB.
   * ''/home/straka/wiki/cs-seq-small'' -- compressed SequenceFile of Czech Wikipedia, 35kB.
-  * ''/home/straka/wiki/cs-text'' -- uncompressed plain text files of Czech Wikipedia, 200MB.
+  * ''/home/straka/wiki/cs-text'' -- uncompressed plain text files of Czech Wikipedia in the ''KeyValueTextInputFormat'', 200MB.
-  * ''/home/straka/wiki/cs-text-medium'' -- uncompressed plain text files of Czech Wikipedia, 16MB.
+  * ''/home/straka/wiki/cs-text-medium'' -- uncompressed plain text files of Czech Wikipedia in the ''KeyValueTextInputFormat'', 16MB.
-  * ''/home/straka/wiki/cs-text-small'' -- uncompressed plain text files of Czech Wikipedia, 70kB.
+  * ''/home/straka/wiki/cs-text-small'' -- uncompressed plain text files of Czech Wikipedia in the ''KeyValueTextInputFormat'', 70kB.
   * ''/home/straka/wiki/en-seq'' -- compressed SequenceFile of English Wikipedia, 1.9GB.
+It is recommended to use the text format in the tutorial, so that both input and output files are readable.
+----
+<html>
+<table style="width:100%">
+<tr>
+<td style="text-align:left; width: 33%; "></html>[[step-1|Step 1]]: Setting the environment.<html></td>
+<td style="text-align:center; width: 33%; "></html>[[.|Overview]]<html></td>
+<td style="text-align:right; width: 33%; "></html>[[step-3|Step 3]]: Basic mapper.<html></td>
+</tr>
+</table>
+</html>

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