[ Skip to the content ]

Institute of Formal and Applied Linguistics Wiki

• ÚFAL Wiki Home
• ÚFAL Home
• Sitemap
• RSS
• ÚFAL calendar
• Recent changes
• Login
• Hledat:

[ Back to the navigation ]

Differences

This shows you the differences between two versions of the page.

View differences: Side by SideInline Go

Link to this comparison view

Both sides previous revision Previous revision 2012/01/31 15:12 majlis Fixed code for sorting execution.2012/01/31 13:04 straka 2012/01/31 12:47 straka 2012/01/31 12:45 straka 2012/01/31 12:20 straka 2012/01/31 12:19 straka 2012/01/31 10:01 straka 2012/01/31 09:53 straka Change Java commandline syntax.2012/01/30 16:25 majlis Fixed mistake in code 2.2012/01/30 15:46 majlis 2012/01/30 15:40 majlis 2012/01/30 15:28 majlis 2012/01/30 15:23 majlis 2012/01/28 00:12 straka 2012/01/28 00:06 straka 2012/01/28 00:04 straka 2012/01/27 23:56 straka 2012/01/27 23:56 straka 2012/01/27 23:47 straka 2012/01/27 23:42 straka 2012/01/27 23:27 straka 2012/01/27 20:11 straka vytvořeno Go		2012/01/31 15:12 majlis Fixed code for sorting execution.2012/01/31 13:04 straka 2012/01/31 12:47 straka 2012/01/31 12:45 straka 2012/01/31 12:20 straka 2012/01/31 12:19 straka 2012/01/31 10:01 straka 2012/01/31 09:53 straka Change Java commandline syntax.2012/01/30 16:25 majlis Fixed mistake in code 2.2012/01/30 15:46 majlis 2012/01/30 15:40 majlis 2012/01/30 15:28 majlis 2012/01/30 15:23 majlis 2012/01/28 00:12 straka 2012/01/28 00:06 straka 2012/01/28 00:04 straka 2012/01/27 23:56 straka 2012/01/27 23:56 straka 2012/01/27 23:47 straka 2012/01/27 23:42 straka 2012/01/27 23:27 straka 2012/01/27 20:11 straka vytvořeno Go Next revision Both sides next revision
courses:mapreduce-tutorial:step-25 [2012/01/31 09:53] straka Change Java commandline syntax.		courses:mapreduce-tutorial:step-25 [2012/01/31 10:01] straka
Line 101:		Line 101:
	* ''Reducer<Text, IntWritable, Text, NullWritable>'' which discards the value and outputs key only.		* ''Reducer<Text, IntWritable, Text, NullWritable>'' which discards the value and outputs key only.
	The solution is a bit clumsy. If the mapper could output (key, value, partition) instead of just (key, value), we would not have to use the ''value'' as a partition number and the types would be simplified.		The solution is a bit clumsy. If the mapper could output (key, value, partition) instead of just (key, value), we would not have to use the ''value'' as a partition number and the types would be simplified.
		+
		+	**Remark:** If the type of keys or values which the mapper outputs //is different// than the type of keys and values the reducer outputs, then [[http://hadoop.apache.org/common/docs/r1.0.0/api/org/apache/hadoop/mapreduce/Job.html#setMapOutputKeyClass(java.lang.Class)|job.setMapOutputKeyClass]] or [[http://hadoop.apache.org/common/docs/r1.0.0/api/org/apache/hadoop/mapreduce/Job.html#setMapOutputValueClass(java.lang.Class)|job.setMapOutputValueClass]] must be used. If they are not used, the type of keys and values produced by the mapper is expected to be the same as from the reducer.
	<file java ArticlesAndWords.java>		<file java ArticlesAndWords.java>

---

[ Back to the navigation ] [ Back to the content ]